SPACEBORN (Medicinal Mushroom Masterpiece)
September 12, 2022
Red (Yellow Letters) Mug
November 24, 2022
FORCE FIELD (EMF & Radiation Blocker)
$275.00
Introducing
Interstellar Blend ™
FORCE FIELD
EMF / radiation BLOCKER
200:1 Concentration
Radioprotective role of natural polyphenols: From sources to mechanisms
The identification and development of radioprotective agents have emerged as a subject matter of research during recent years due to the growing usage of ionizing radiation in different areas of human life. Previous work on synthetic radioprotectors has achieved limited progress because of the numerous issues associated with toxicity. Compounds extracted from plants have the potential to serve as lead candidates for developing ideal radioprotectors due to their low cost, safety, and selectivity. Polyphenols are the most abundant and commonly dispersed group of biologically active molecules possessing a broad range of pharmacological activities. Polyphenols have displayed efficacy for radioprotection during various investigations and can be administered at high doses with lesser toxicity. Detoxification of free radicals, modulating inflammatory responses, DNA repair, stimulation of hematopoietic recovery, and immune functions are the main mechanisms for radiation protection with polyphenols. Epicatechin, epigallocatechin-3-gallate, apigenin, caffeic acid phenylethylester, and silibinin provide cytoprotection together with the suppression of many pro-inflammatory cytokines owing to their free radical scavenging, anti-oxidant, and anti-inflammatory properties. Curcumin, resveratrol, quercetin, gallic acid, and rutin’s radioprotective properties are regulated primarily by the direct or indirect decline in cellular stress. Thus, polyphenols may serve as potential candidates for radioprotection in the near future; however, extensive investigations are still required to better understand their protection mechanisms.
Prevention from radiation damage by natural products
Radiotherapy is a mainstay of cancer treatment since decades. Ionizing radiation (IR) is used for destruction of cancer cells and shrinkage of tumors. However, the increase of radioresistance in cancer cells and radiation toxicity to normal tissues are severe concerns. The exposure to radiation generates intracellular reactive oxygen species (ROS), which leads to DNA damage by lipid peroxidation, removal of thiol groups from cellular and membrane proteins, strand breaks and base alterations.
Hypothesis: Plants have to deal with radiation-induced damage (UV-light of sun, other natural radiation sources). Therefore, it is worth speculating that radioprotective mechanisms have evolved during evolution of life. We hypothesize that natural products from plants may also protect from radiation damage caused as adverse side effects of cancer radiotherapy.
Methods: The basis of this systematic review, we searched the relevant literature in the PubMed database.
Results: Flavonoids, such as genistein, epigallocatechin-3-gallate, epicatechin, apigenin and silibinin mainly act as antioxidant, free radical scavenging and anti-inflammatory compounds, thus, providing cytoprotection in addition to downregulation of several pro-inflammatory cytokines. Comparable effects have been found in phenylpropanoids, especially caffeic acid phenylethylester, curcumin, thymol and zingerone. Besides, resveratrol and quercetin are the most important cytoprotective polyphenols. Their radioprotective effects are mediated by a wide range of mechanisms mainly leading to direct or indirect reduction of cellular stress. Ascorbic acid is broadly used as antioxidant, but it has also shown activity in reducing cellular damage after irradiation mainly due to its antioxidant capabilities. The metal ion chelator, gallic acid, represents another natural product attenuating cellular damage caused by radiation.
Conclusions: Some secondary metabolites from plants reveal radioprotective features against cellular damage caused by irradiation. These results warrant further analysis to develop phytochemicals as radioprotectors for clinical use.
Radiation protection and mitigation by natural antioxidants and flavonoids: implications to radiotherapy and radiation disasters
Background: Nowadays, ionizing radiations are used for various medical and terroristic aims. These purposes involve exposure to ionizing radiations. Hence, people are at risk for acute or late effects. Annually, millions of cancer patients undergo radiotherapy during their course of treatment. Also, some radiological or nuclear events in recent years pose a threat to people, hence the need for radiation mitigation strategies. Amifostine, the first FDA approved radioprotector, has shown some toxicities that limit its usage and efficiency. Due to these side effects, scientists have researched for other agents with less toxicity for better radioprotection and possible mitigation of the lethal effects of ionizing radiations after an accidental exposure. Flavonoids have shown promising results for radioprotection and can be administered in higher doses with less toxicity. Studies for mitigation of ionizing radiation-induced toxicities have concentrated on natural antioxidants. Detoxification of free radicals, management of inflammatory responses and attenuation of apoptosis signaling pathways in radiosensitive organs are the main mechanisms for radiation protection and mitigation with flavonoids and natural antioxidants. However, several studies have proposed that a combination in the form of some antioxidants may alleviate radiation toxicities more effectively in comparison to a single form of antioxidants.
Conclusion: In this review, we focus on recent findings about natural radioprotectors and mitigators which are clinically applicable for radiotherapy patients, as well as injured people in possible radiation accidents.
An overview of the cellular mechanisms of flavonoids radioprotective effects
Considering the remarkable application of radiotherapy in the treatment and diagnosis of various diseases and even nuclear war, it is important to protect healthy tissues and people at risk from the radiation. Currently, there is no ideal and safe radioprotective agent available and we are seeing a great effort to find these agents from natural sources. Phenolic compounds, as well as flavonoid, are presented widely as the second metabolite in plants and they have been considered for investigation according to their benefits for human health, healing and preventing many disorders. The major bioactive benefits of flavonoids include antioxidant, anti-inflammatory, anti-tumor, anti-aging, anti-bacterial and viral, neuroprotection and radioprotective effects. Their lower toxicity and oral administration have made it suitable for radiotherapy patient, radiation, military forces, and even the general public. This review attempts to provide a summary of the main molecular mechanisms involved in flavonoid radio-protective effects. Data of these studies will provide a comprehensive perspective to flavonoids and can help to optimize their effects in radioprotection procedures.
Phytochemicals as radioprotective agents
The development of radioprotective agents has been a subject of intense research in view of their potential for use within a radiation environment, such as space exploration, radiotherapy and even nuclear war. Since no ideal, safe synthetic radioprotectors are available to date, the search for alternative sources, including plants, has been on-going for several decades. In the Traditional Indian system of medicine, several plants have been used to treat radiation-mediated ailments. A systematic screening approach can only provide leads to identify potential new molecular entities from plant sources, for mitigation of radiation injury. This article reviews the milestones in development of radioprotectors with emphasis on perspectives of variety of plants, their bioactive principles and several alternative approaches tested in in vitro and in vivo model systems for radioprotection. With an overview of our own work carried out in this area, this review highlights the unique inherent properties in plants and the phytochemicals that aid in preventing free radical-induced oxidative stress during radiation therapy. The structural characteristics of these phytochemicals, rendering them suitable for radioprotection, have also been discussed, with the scope of their applications in the fields involving imbalanced redox status and oxidative stress.
Medicinally important aromatic plants with radioprotective activity
SCIENCE & INGREDIENTS
Â-Carotene
Male CBA mice received graded doses (450–750 rad) of total-body γ-radiation (TBR) from a dual-beam 137CS irradiator. Commencing directly after TBR, 2 days later, or 6 days later, groups of mice received supplemental vitamin A (V it A) or β-carotene (β-Car), compounds previously found to reduce radiation disease in mice subjected to partial-body X-irradiation. Given directly after TBR, supplemental Vit A decreased mortality, evidenced by increases in the radiation dose required to kill 50% of the mice within 30 days (LD50/30). In one experiment, Vit A increased the LD50/30 from 555 to 620 rad; in another experiment, Vit A increased the dose from 505 to 630 rad. Similarly, in a third experiment, supplemental β-Car increased the LD50/30 from 510 to 645 rad. Additionally, each compound increased the survival times, even of those mice that died within 30 days. In addition to reduction of mortality and prolongation of survival time, supplemental Vit A moderated weight loss, adrenal gland hyperemia, thymus involution, and lymphopenia-all signs of radiation toxicity. Delaying the supplementation for 2 days after irradiation did not greatly reduce the efficacy of Vit A; however, delaying supplementation for 6 days decreased its effect almost completely.
There is a debate concerning the effects of antioxidant vitamins during radiation therapy: Can they reduce the adverse effects of therapy without reducing treatment efficacy? We examined whether dietary and plasma beta carotene and alpha tocopherol were related to severe acute adverse effects of radiation therapy and to cancer local recurrence. We conducted a prospective study of 540 head and neck cancer patients treated by radiation therapy. Dietary intakes of beta carotene and alpha tocopherol were measured by a validated food frequency questionnaire and plasma levels were determined. Acute adverse effects of radiation therapy and local recurrence were documented. A higher beta carotene dietary intake was associated with fewer severe acute adverse effects: odds ratio (OR) = 0.61 [95% confidence interval (CI) = 0.40–0.93]. There was a tendency for a similar effect for plasma beta carotene: OR = 0.73 (95% CI = 0.48–1.11). Participants with higher plasma beta carotene had a significantly lower rate of local recurrence (hazard ratio = 0.67; 95% CI = 0.45–0.99). Alpha tocopherol was not related to severe adverse effects or to cancer recurrence. This study suggests that a higher usual dietary beta carotene intake can reduce the occurrence of severe adverse effects of radiation therapy and decrease local cancer recurrence.
Acanthopanax senticosus (Rupr. Maxim.) Harms extract
Bioactive compounds including polysaccharides, flavones, syringin and eleutheroside E were extracted from wild Acanthopanax senticosus to obtain purities of 88.4% ± 3.2%, 90.8% ± 2.0%, 92.5% ± 1.5% and 82.7% ± 4.7% respectively. In vitro antioxidant activities and in vivo anti-radiation activities of the compounds were investigated and compared. The results demonstrated that polysaccharides and flavones extracted from A. Senticosus were more effective than syringin and eleutheroside E in their radical scavenging activity in vitro. In vivo studies showed that polysaccharides and flavones were also effective in protecting mice from heavy ion radiation induced tissue oxidative damage. Furthermore, the activities of polysaccharides and flavones in repressing expression changes of radiation response proteins including heat shock protein, disulfide-isomerase and glutathione S-transferase, were also identified by our results. These radioprotective effects were more significant when polysaccharides and flavones were administered together.
Bioactive compounds including polysaccharides, flavones, syringin and eleutheroside E were extracted from wild Acanthopanax senticosus and purified by chromatography. In vitro and in vivo anti-radiation activities of the compounds were compared. In vitro radical scavenging results showed that polysaccharides and flavones were more effective than syringin and eleutheroside E in In vivo study proved that polysaccharides and flavones were effective in protecting mice from heavy ion radiation induced oxidative damages. Also, the activity of polysaccharides and flavones in repressing expression changes of radiation response proteins including heat shock protein, disulfide-isomerase and glutathione S-transferase were also found by our results. Moreover, the radioprotective effects were more significant when polysaccharides and flavones were used together.
Acanthopanax senticosus reduces brain injury in mice exposed to low linear energy transfer radiation
Conclusion: AS is a promising approach to reduce radiation–induced brain injury. Further studies are warranted to examine the potential of AS to reduce the side effects caused by chemotherapeutics.
Acanthopanax senticosus( Rupr. et Maxim)Harms extract Eleutheroside B+E
Eleutheroside E (EE), a principal active compound of Acanthopanax senticosus, has been shown to have a certain neuromodulation effect. Our previous study indicates that EE protects nerve damage caused by radiation. However, its specific function and underlying mechanism remain unknown. Therefore, the objective of this study is to apply the C. elegans model to illuminate the property and mechanism of EE protecting against nerve damage caused by radiation. Here, we found that EE significantly improved the long-term memory of radiation–damaged C. elegans. Through transcriptome sequencing, the results showed that EE protected radiation–damaged C. elegans mainly through G-protein-coupled receptor and neuropeptide signaling pathways. Further research indicated that EE affected the activity of CREB by cAMP-PKA, Gqα-PLC, and neuropeptide signaling pathways to ultimately improve the long-term memory of radiation–damaged C. elegans. In addition, the activity of Gqα and neuropeptides in AWC neurons and the activity of CREB in AIM neurons might be crucial for EE to function.
radiation affects not only cognitive function but also gut microbiota. Eleutheroside E (EE), a principal active compound of Acanthopanax senticosus, has a certain protective effect on the nervous system. Here, we find a four-week EE supplementation to the 60Co-γ ray irradiated mice improves the cognition and spatial memory impairments along with the protection of hippocampal neurons, remodels the gut microbiota, especially changes of Lactobacillus and Helicobacter, and altered the microbial metabolites including neurotransmitters (GABA, NE, ACH, 5-HT) as well as their precursors. Furthermore, the fecal transplantation of EE donors verifies that EE alleviated cognition and spatial memory impairments, and activates the PKA/CREB/BDNF signaling via gut microbiota. Our findings provide insight into the mechanism of EE effect on the gut-brain axis and underpin a proposed therapeutic value of EE in cognitive and memory impairments induced by radiation.
acemannan
Acemannan (poly-acetylated mannose) is an active component of Aloe vera gel and has been reported to have anticancerous, antimicrobial and shown to stimulate the development and proliferation of the hematopoietic cells. The anticancerous properties of acemannan have been attributed to the modulation of immune system rather then cytotoxicity. Therefore objective of the present study was to evaluate radioprotective efficacy of acemannan against radiation induced immune suppression using Swiss albino mice as a model system. For In-vivo studies mice were treated for 7 days orally prior to irradiation (5 Gy). Animals were sacrificed at different time point to study the effect on cellular proliferation, DNA damage, apoptosis and ROS level, cytokines level, antioxidant enzymes, nitric oxide and protein expression. For survival studies mice were treated with acemannan for 7 days pre or post irradiation and survival was monitored for 30 days. Acemannan showed a significant induction of proliferation of splenocytes in radiation treated groups. Beside a decrease in radiation induced ROS and DNA damage resulted in the reduction of apoptosis in murine splenocytes. Acemannan restored the antioxidant enzyme level (catalase, SOD, DTD and GST) and maintained the proper redox status via GSH, in irradiated mice.
Eight dogs and five cats with histopathologically confirmed fibrosarcomas were treated with Acemannan Immunostimulanta in combination with surgery and radiation therapy. These animals had recurring disease that had failed previous treatment, a poor prognosis for survival, or both. Following four to seven weekly acemannan treatments, tumor shrinkage occurred in four (greater than 50%; n = 2) of 12 animals, with tumors accessible to measurement. A notable increase in necrosis and inflammation was observed. Complete surgical excision was performed on all animals between the fourth and seventh week following initiation of acemannan therapy. radiation therapy was instituted immediately after surgery. Acemannan treatments were continued monthly for one year. Seven of the 13 animals remain alive and tumor-free (range, 440+ to 603+ days) with a median survival time of 372 days. The data suggests that Acemannan Immunostimulant may be an effective adjunct to surgery and radiation therapy in the treatment of canine and feline fibrosarcomas.
Acemannan-containing wound dressing gel reduces radiation–induced skin reactions in C3H mice
Results: The average peak skin reactions of the wound dressing gel-treated mice were lower than those of the untreated mice at all radiation doses tested. The ED,, values for skin reactions of 2.0-2.75 were approximately 7 Gy higher in the wound dressing gel-treated mice. The average peak skin reactions and the EDSo values for mice treated with personal lubricating jelly or healing ointment were similar to irradiated control values. reduction in the percentage of mice with skin reactions of 2.5 or more was greatest in the groups that received wound dressing gel for at least 2 weeks beginning immediately after irradiation. There was no effect if gel was applied only before irradiation or beginning 1 week after irradiation.
Conclusion: Wound dressing gel, but not personal lubricating jelly or healing ointment, reduces acute radiation–induced skin reactions in C3H mice if applied daily for at least 2 weeks beginning immediately.
Acorus calamus Linn
Enhancement of DNA repair mechanism was also monitored. The extract effectively scavenged free radicals in a concentration dependent manner. Presence of A. calamus extract during irradiation prevented peroxidation of membrane lipids in mouse liver homogenate. It helped to reduce the disappearance of the covalently closed circular (ccc) form of plasmid DNA following exposure to γ-radiation. Also the A. calamus extract effectively protected DNA from radiation induced strand breaks and enhanced the DNA repair process. Hence A. calamus extract can be used as a good source of natural radioprotecting agent.
The radioprotecting activity of Acorus calamus extract after whole body exposure of mice to lethal and sub-lethal doses of γ-irradiation in terms of radiation induced mortality and damages to cellular DNA and tissue antioxidant levels were studied. A. calamus extract (250 mg/kg body weight) was orally administered to mice 1 h prior to whole body γ-radiation exposure. The antioxidant levels in the tissue homogenates of brain, liver and kidney of the irradiated mice were determined and cellular DNA damage was monitored by comet assay.
effect of administration of the extract on survival of the animals exposed to acute lethal dose of 10 Gy whole body γ-radiations was also monitored. Administration of the extract significantly increased the activities of major enzymes of the antioxidant defense system specially SOD, catalase and GPx and levels of GSH in 2, 6 and 10 Gy irradiated mice and decreased the formation MDA. The extract also decreased DNA strand breaks. The survival rate was found to be increased up to 5%.
These studies highlight the role of A. calamus extract as good source of natural radioprotecting agent and its therapeutic implications for radiation–induced injuries.
Adhatoda vasica (L) Nees leaves
The results showed that Cr content was the highest in roots as compared to other parts under Cr+euv-B. significant reductions in photosynthetic rate, intercellular CO2 concentration, and stomatal conductance were observed under all treatments with maximum under Cr+euv-B. Chlorophyll (Chl) fluorescence parameters showed variable responses under Cr and Cr+euv-B. Chl content showed reductions under all treatments whereas Chl a/b ratio and carotenoids showed increment under euv-B and reductions under Cr and Cr+euv-B. The ultrastructure of leaves showed changes in chloroplasts under treatments. Vasicine (medicinally important secondary metabolite) increased under treatments.
Our study revealed that A. vasica showed variable responses towards individual and interactive stress of Cr and euv-B.
The objective of present study was to evaluate the antioxidant enzyme activities in pectoralis muscle of mice. Mice were divided into four groups i.e. Group (i) containing normal mice served as control; group (ii) mice given 900 mg/kg body wt. of Adhatoda vasica extract orally; group (iii) mice were exposed to gamma radiation (6Gy) and group (iv) mice given Adhatoda vasica leaf extract plus gamma radiation (6 Gy).
Present study demonstrated that Adhatoda vasica leaf extract provides protection against free radical damage.
prevention of radiation induced histopathological changes in mice biceps muscle by Adhatoda vasica
Ionizing radiation has a diversity of beneficial uses in medicine including radiotherapy, radiographs etc. Scientific and technological advancements have further increased the radiation burden in humans. Adhatoda vasica is well known plant drug in Ayurvedic and Unani medicine well documented for therapeutic potential. The present study was designed to evaluate histopathological responses of biceps muscle after Adhatoda extract treatment, irradiation and extract + irradiation
Aegle marmelos fruit
Fruit extract of Aegle marmelos protects mice against radiation–induced lethality
radiation–induced hematological alterations and their inhibition by Aegle Marmelos fruit extract
This study was carried out to observe the radio protective potential of Aegle Marmelos fruit extract (AME) against radiation–induced hematological and biochemical alterations in blood and liver of mice. For this purpose, adult Swiss albino mice were exposed to 6 Gy gamma radiation in the presence (experimental) or absence (control) of the extract (100 mg/kg body weight animal/day). exposure to radiation resulted in a significant decline in the count of erythrocyte, hemoglobin (Hb) and hematocrit (Hct) in peripheral blood. In contrast, extract–pretreated irradiated animals had a significant rise in all of these blood constituents, as compared with the irradiated control. Furthermore, a significant elevation in lipid peroxidation over normal was recorded in the irradiated control, whereas such increase was considerably lesser in extract–pretreated animals. Likewise, pretreatment with AME caused a significant increase in glutathione levels in the serum, as well as in the liver, in comparison to irradiated controls.
These results indicate that AME may be responsible for the protection of stem cells in bone marrow, subsequently resulting in a rise of hematological constituents in peripheral blood. The present study affirms the prophylactic use of AME against radiation–induced hematological and biochemical alterations in mammals.
Debilitation of radiation induced intestinal injury by Aegle marmelos fruit extract in mice
Protection of intestinal constituents by Aegle marmelos extract (AME) was studied after exposure to 6 Gy gamma radiations in mice. irradiation produced a significant decrease in crypt survival, mitotic figures and villus length; whereas a significant increase in goblet and apoptotic cells from Sham irradiated animals. Maximum alterations in all the parameters were observed on day 3rd of irradiation but without restoring to normal even till the end of experimentation. AME pretreated irradiated animals resulted in a noticeable increase in the number of crypt cells, mitotic figures and villus length; whereas the counts of apoptotic and goblet cells showed a significant decrease from respective control at all the autopsy intervals. Furthermore, AME administration significantly inhibited radiation–induced elevation in lipid peroxidation and a reduction in glutathione levels in blood, liver and intestine.
The results from the present study demonstrate the inhibitory role of Aegle marmelos fruit extract against radiation induced intestinal alterations in mammals.
Ageratum conyzoides Linn.
The ACE treatment effectively protected mice against the gastrointestinal as well as bone marrow related death, as revealed by the increased number of survivors at all irradiation doses. The dose reduction factor was found to be 1.3. To understand the mechanism of action, various doses of ACE were evaluated for their in-vitro scavenging action on 1,1-diphenyl-2-picrylhydrazyl (DPPH), a chemically stable free radical. ACE was found to scavenge DPPH radicals in a concentration-dependent manner, indicating that the radioprotection afforded by ACE may be in part due to the scavenging of reactive oxygen species induced by ionizing radiation.
Aloe barbadensis
Cutaneous exposure to ultraviolet radiation suppresses the induction of T cell mediated responses such as contact and delayed type hypersensitivity (DTH) by altering the function of immune cells in the skin and causing the release of immunoregulatory cytokines. extracts of crude Aloe barbadensis gel prevent this photosuppression. Because the regulation of contact hypersensitivity and DTH responses differ, we investigated whether protection was afforded by a single or multiple agents in Aloe and the mechanism by which this material prevents suppression of DTH immunity. The ability of Aloe gel to prevent suppression of contact hypersensitivity responses to hapten decayed rapidly after manufacture. In contrast, agents that protected against systemic suppression of DTH responses to Candida albicans were stable over time. Oligosaccharides prepared from purified Aloe polysaccharide prevented suppression of DTH responses in vivo and reduced the amount of IL-10 observed in ultraviolet irradiated murine epidermis.
We investigated the ability of Aloe barbadensis gel extract to prevent suppression of contact hypersensitivity (CHS) and delayed-type hypersensitivity (DTH) responses in mice by ultraviolet (uv) irradiation. Local immune suppression was induced in C3H mice by exposure to four daily doses of 400 J/m2 uv-B (280 – 320 nm) radiation from FS40 sunlamps, followed by sensitization with 0.5% fluorescein isothiocyanate (FITC) through the irradiated skin. Topical application of 0.167-1.67% Aloe gel after each irradiation significantly reduced this suppression.
Aloe treatment partially preserved the number and morphology of Langerhans and Thy-1+ dendritic epidermal cells in skin, compared to those in the skin of mice given only uvR or uvR plus the vehicle. Experiments using a single (2 kJ/m2) dose of uvR followed by Aloe treatment showed that the effect of Aloe was not due to screening of the uvR. Systemic suppression of DTH to Candida albicans or CHS to FITC was induced in C3H mice exposed to 5 or 10 kJ/m2 uv-B radiation, respectively, on shaved dorsal skin and sensitized 3 d later with a subcutaneous injection of formalin-fixed Candida or FITC painted on unirradiated, ventral skin. treatment of the uv–irradiated skin with Aloe immediately after irradiation prevented suppression of both DTH to Candida and CHS to FITC. Aloe treatment did not prevent the formation of cyclobutyl pyrimidine dimers in the DNA of uv–irradiated skin or accelerate the repair of these lesions.
These studies demonstrate that topical application of Aloe barbadensis gel extract to the skin of uv–irradiated mice ameliorates uv–induced immune suppression by a mechanism that does not involve DNA damage or repair.
Aloe vera extract polysaccharide
Plant polysaccharides have been reported to stimulate growth, differentiation and proliferation of hematopoietic progenitor and stem cells to protect against the deleterious effects of radiations. This study evaluated the radioprotective potential of acemannan, a major polysaccharide component of aloe vera gel. treatment of mice with 50 mg/kg body weight of acemannan by oral gavage for 7 days was able to protect against the radiation–induced mortality. Seven-day pretreatment or post-treatment of mice with acemannan resulted in the increase in median survival by 60 and 20%, respectively. The decrease in mortality can be attributed to the induction of hematopoiesis (peripheral lymphocytes counts, spleen cellularity, spleen index) and the upregulation of cytokines like TNF-α and IL-1 by acemannan in irradiated mice.
Data indicate that acemannan has the ability to protect mice against radiation–induced mortality by immunomodulation and can be developed as a radiation damage mitigation agent.
Aloe polysaccharides mediated radioprotective effect through the inhibition of apoptosis
Polysaccharides from aloe are always considered an effective radioprotector on irradiation–induced skin damage.
The aim of this study was to determine if aloe polysaccharides (AP) have radioprotective effects on normal human cells in vitro and mouse survival in vivo and to explore the mechanism. pretreatment with 50 μg/ml AP could improve the surviving fraction at 2 Gy (SF 2 ) of three normal cell lines 293, ECV304, and C. liver from 41.5%, 46.5%, and 40.9% to 49.4%, 72.1%, and 89.1%, respectively. AP could also reduce the apoptotic rate of C. liver cells from 9.5% and 43.0% to 2.2% and 10.9% 48 h and 72 h after 2 Gy irradiation, respectively. Western blot analysis showed that pretreatment with AP could block the upregulation of pro-apoptotic p53, Bax, and Bad and the downregulation of Bcl-2 by irradiation. AP could lower thymocyte apoptosis of mice in vivo after 6 Gy irradiation and abrogate the cell cycle perturbation. Fifty mg/kg of AP treatment for 30 min before 7.5 Gy irradiation provided the best radioprotective effect and improved the 30-day survival rate of mice to 86.0%, from 10.0%. AP exerted radioprotective effects in vitro and in vivo through an inhibition of apoptosis.
radioprotective effects and mechanisms of animal, plant and microbial polysaccharides
Recently, some studies have shown that polysaccharides were resistant to radiation. In the review, the anti-radiation activities of polysaccharides from different sources are summarized, and the anti-radiation mechanisms are discussed as well. It can be used to develop more effective anti-radiation management drugs.
Angelica sinensis
In the results, compared with the model group, NOS, NO and MDA contents were decreased in the middle and high dose groups while SOD contents were increased in low, middle and high dose groups. The levels of TGF-β, p-Smad2 and p-Smad3 were increased in low, middle and high dose groups while the levels of BMP7, p-Smad1 and p-Smad5 were decreased in middle and high dose groups.
In conclusion, ASP can reduce the expression levels of TGF-β, p-Smad2 and p-Smad3 in kidney of rats induced by radiation, increase the expression levels of BMP7, p-Smad1 and p-Smad5, and resist the body injury caused by radiation by regulating BMP-7/Smads/ TGF-β1 signal pathway.
To investigate the protective effect of Angelica sinensis polysaccharide (ASP) on spleen injury and its influence of Bcl-2/Bax/Caspase-3 signal pathway in radiation rats, 60 Sprague Dawley (SD) rats were divided into 5 groups randomly: the normal group, the model group, low-, middle- and high- dose of ASP groups. On the 15th day after the appropriate medication, all the rats except the normal group received the 60Co γ-ray irradiation once with a total dose of 4.0Gy. The levels of NF-kBp65 and IKKa in serum, the contents of MDA, GSH and SOD in spleen of each group were detected with ELISA after 24 h of irradiation, and the protein expression levels of Bcl-2, Bax, Caspase-3, HSPBP1 and TIMM8B in spleen of each group were detected by western blotting.
The results showed that compared with the model group, NF-kBp65, IKKa and MDA contents were decreased while GSH and SOD contents were increased in the middle and high dose groups. The level of Bcl-2 and TIMM8B were increased while Bax, caspase-3 and HSPBP1 were decreased in all groups. In conclusion, Angelica sinensis polysaccharide can reduce the expression levels of Bax and caspase-3, while increase the level of Bcl-2 in spleen of rats induced by radiation and antagonize the body injury caused by radiation by regulating Bcl 2/Bax/Caspase 3 signaling pathway.
anthocyanin (grape skin)
Grape extract protect against ionizing radiation–induced DNA damage
Pretreatment with different grape extracts showed various degree of protection against radiation–induced DNA damage. pretreatment with 1.6 µg grape skin extract of ‘Thompson seedless’ cultivar or grape flesh extract of any tested cultivar diminished the DNA strand breaks, and there was an increase in the super coiled form of DNA against 150 Gy of γ-radiation. However, pretreated pBR 322 DNA with the skin of ‘Kishmish chorni’ cultivars or seed of ‘red globe’ grape cultivars remained static during electrophoresis and confined in the groove on exposure to 150 Gy γ-radiation treatment. Co-treatment with the skin of red globe cultivar also partially confined plasmid DNA in the groove.
The same trend was observed when plasmid DNA was exposed to 1.2 kGy γ-radiation. Our investigation revealed that anthocyanin present in grape skin was probably involved in radio protective activities through the formation of co-pigmentation with DNA.
To study the role of infrared (IR) radiation in the color change of the grape berry, field screening (IR−) and in vitro culture irradiation (IR+) were used. Acylated anthocyanin biosyntheses, including the biosynthesis of malvidin 3-O-glucoside, peonidin 3-O-glucoside, and their derivatives (acetylation and p-coumaroylation), were inhibited by IR–. IR+ promoted the biosynthesis of malvidin 3-O-glucoside and its derivatives, and IR+ inhibited the biosynthesis of peonidin 3-O-glucoside and its derivatives. WGCNA analysis revealed that the red module positively correlated with the flavonoid pathway. The hub genes were related to the anthocyanin pathway, including VvF3′5′H, VvANS, VvOMT1, VIT_18s0001g09400, and VvGST4.
Further, the results revealed that transcription factors like RLK-Pelle, MYB, and C2H2 families were involved in response to IR radiation. Therefore, these results provide a complete understanding of IR radiation in grape skin color formation and the prospect of using supplemental light to improve the overall color of berries.
Artemisiae Herba
This study was performed to examine the effects of DA-9601, a novel antiulcer agent extracted from Artemisiae Herba, on radiation colitis in the rat. Female Wistar rats received a 30 Gy dose of irradiation to the 2 cm of distal colon in length using an intrarectal applicator system. 30 mg/tg or 100 mg/kg of DA- 9601 was administered orally 30 min before and 4 h after radiation on day 1. And the same dose of DA-9601 was given to the animals twice a day from day 2 to 14.
These data suggest that the inflammatory response induced by ACF is reduced by DA-9601 via lowering of the expression of genes encoding the inflammatory cytokines and the concentration of inflammatory mediators. Furthermore, DA-9601 inhibited the acute inflammatory response mediated by T cells, resulting in an improvement in ACF-induced enteritis.
Astragalus membranaceus
In this work, Astragalus membranaceus hairy root cultures (AMHRCs) were exposed to ultraviolet radiation (uv-A, uv-B, and uv-C) for promoting isoflavonoid accumulation. The optimum enhancement for isoflavonoid production was achieved in 34-day-old AMHRCs elicited by 86.4 kJ/m2 of uv-B. The resulting isoflavonoid yield was 533.54 ± 13.61 μg/g dry weight (DW), which was 2.29-fold higher relative to control (232.93 ± 3.08 μg/g DW). uv-B up-regulated the transcriptional expressions of all investigated genes involved in isoflavonoid biosynthetic pathway. PAL and C4H were found to be two potential key genes that controlled isoflavonoid biosynthesis. Moreover, a significant increase was noted in antioxidant activity of extracts from uv-B-elicited AMHRCs (IC50 values = 0.85 and 1.08 mg/mL) in comparison with control (1.38 and 1.71 mg/mL).
Overall, this study offered a feasible elicitation strategy to enhance isoflavonoid accumulation in AMHRCs and also provided a basis for metabolic engineering of isoflavonoid biosynthesis in the future.
Objective: The research aimed to study the tissue culture technology and callus induction by radiation mutation of A. membranaceus Bge
Method: With the different parts of Astragalus membranaceus Bge. var. mongholicus (Bge.) Hsiao aseptic seedling as explants (leaves, cotyledons, hypocotyls) induced callus, and cotyledon and hypocotyls taken by the method of radiation mutation were studied.[Result]The results showed that the three explants had relatively high callus induced rate in the medium which respectively made up of MS +6-BA 2.0 mg/L + NAA 2.0 mg/L,LS +6-BA 2.0 mg/L +NAA 0.1 mg/L,MS + 6-BA 2.0 mg/L + NAA 2.0 mg/L; the optimum mutation time of hypocotyls and cotyledons was 15 minutes; the growth of the callus induced from hypocotyls would be better as the mutation time increased, but when it reached a certain time the growth would be weaken, the induction rate also would be reduced.
Conclusion: This study will provide the scientific reference in tissue culture and mutation breeding of A. membranaceus Bge.
Traditional Chinese medicine (TCM) may be an ideal candidate therapy as it usually produces fewer side effects even with long-term administration. In this paper, we reviewed current therapeutic approaches to prevent radiation–induced brain neuropathological and functional changes. neuroprotective effects of TCM in different brain injury models have been briefly summarized. We then reviewed the neuroprotective and radioprotective effect of TCM in different radiation exposure models and discussed the potential molecular mechanism(s) of the neuroprotective and radioprotective effect of TCM.
Auricularia auricula
Chemical analysis indicated that C AAAP was composed of arabinose, xylose, mannose, glucose and galactose, with the molar ratio at 0.04: 0.13: 1.00: 0.59: 0.29. Moreover, radiation protection against UVB in vitro indicated that at the dose range of 200–500 μg/mL, C AAAP enhanced the protection of HepG2 cells against UVB cytotoxicity than AAAP. However, but at the dose range of 50–150 μg/mL the result was just opposite.
The objectives of this work are to investigate the protective effect of polyphenols from pinecones of Pinus koraiensis (PPPK) on damage caused by radiation in mice, and to test for its potential synergism with Auricularia auricula-judae (Bull.) J. Schröt Polysaccharides (AAP). Male mice are administered for 30 days prior to radiation, and the combination index (CI) is used for the synergistic effect analysis. The results show that PPPK exhibited significant radioprotective effects compared with radiation group (P < 0.01); PPPK in combination with AAP had higher anti-radiation effects, as evident by improved white blood cells (P < 0.01), organ indexes (P < 0.05 or 0.01), splenic lymphocytes proliferation activity (P < 0.01), bone marrow DNA content (P < 0.01), and monocyte phagocytic activity (P < 0.05), relative to other groups; the combination also reduced bone marrow micronucleus rate (P < 0.01) and chromosome distortion rate (P < 0.01).
These data for the first time demonstrated the radioprotective effect of PPPK and its synergistic effect with AAP.
Azadirachta indica
Neem tree (Azadirachta indica A. Juss. fam. Meliaceae) has been extensively employed to combat diverse pathologies. Moreover, it has been described that its leaf extract present anticarcinogenic action. Thus, the neem extract (NE) chemical and antioxidant properties was evaluated, and also, the capacity of two dermatological formulations incorporated with neem extract (F1 and F2) to avoid oxidative UVB–induced skin injury in hairless mice. NE constituents were investigated and free radical scavenging ability were determined by different methods in vitro. skin from mice treated with F1 and F2 and submitted to UVB radiation were tested for different parameters of inflammation and oxidative injury. results show that the NE polyphenol and flavonoid content were 135.30 and 37.12mg/g, respectively. High performance liquid chromatography (HPLC) results demonstrated the existence of azarachtin, rutin, ursolic acid and tannic acid. NE presented scavenging ability by ABTS radical, ferric-reducing antioxidant power (FRAP), inhibition of lipid peroxidation and iron chelation.
Head and neck cancer is the eighth common type among all cancer types around the world. Its treatment comprises surgery, radiation therapy, chemotherapy and /or a combination of restoration therapy and social support Conventional fraction size ranges from 1.8 to 3 Grays (Gy) per fraction over 4–6 weeks. The accumulative dose of radiation for the primary treatment of head and neck cancer treatment is 60 to 70 Gy, depending on the irradiation of the tumor.
Ionizing Radiotherapy is used along with concurrent chemotherapy which is the standard treatment in locally advanced head and neck cancers. radiation treatment is commonly delivered in the form of high energy photons through an external beam. These results in ionization of electrons that cause direct strand breaks of cellular DNA and the release of free radicals, resulting in cellular damage to both normal and tumor cells. radiation disrupts the normal process of wound healing at various stages.
Biodegradable nanoparticles have been widely explored as carriers for controlled delivery of therapeutic molecules; however, studies describing the development of nanoparticles as carriers for biopesticide products are few. In this work, a new method to prepare nanoparticles loaded with neem (Azadirachta indica) extracts is presented. In this study, nanoparticles were formulated as colloidal suspension and (spray-dried) powder and characterized by evaluating pH, particle size, zeta potential, morphology, absolute recovery, and entrapment efficiency. A high-performance liquid chromatography method was used for nanoparticle characterization. The best formulations presented absolute recovery and entrapment efficiencies of approximately 100% and a release profile based on swelling and relaxation of the polymer or polymer erosion. The biological data of the formulated products against Plutella xylostella showed 100% larval mortality.
The nanoparticle information improved the stability of neem products against ultraviolet radiation and increased their dispersion in the aqueous phase.
Bamboo leaf
Conclusion: BLE can be a good source of natural antioxidants. Administration of BLE prior to radiation exposure provided considerable protection in terms of reduction of in vitro radiation induced cytogenetic damage. This study also forms a basis for further analysis of the possible mode of action of the extract.
Leaves of Bamboo species are rich sources of antioxidants. Many papers have reported that antioxidant fraction of bamboo leaves are used to treat many free radial mediated diseases. The present study was undertaken to examine the radio protective effect of the hydro alcoholic leaf extract of Phyllostachysparvifolia against gamma radiation (5gy) induced genomic damage in cultured human peripheral lymphocytes by cytokinesis blocked micronucleus assay.
The ionizing radiation is a known carcinogen as well as cancer therapeutic agent however, the side effect on normal tissue is a limiting factor and inadequate doses necessitates search for an ideal radioprotective agent. Bamboo species are rich source of antioxidants hence have therapeutic value in many free radical mediated diseases. This is the first report regarding in vitro protective effect of bamboo leaf extract against radiation induced genetic damage in human peripheral blood lymphocytes by cytokinesis blocked micronuclei (CBMN) assay. Fresh whole blood was exposed to 5Gy of cobalt-6o gamma radiation with or without 30 min pre-treatment with 3 μl and 5 μl of hydro alcoholic leaf extract of Phyllostachys parvifolia.
Blueberry anthocyanins
Uv–induced DNA damage plays a key role in the etiology of certain diseases. The ability of blueberry anthocyanins and anthocyanidins (BA) to protect cellular DNA from uv–induced damage was investigated. BA were extracted by water (BAW), ethanol (BAE) or methanol (BAM). These extracts partially restored proliferation of uv–irradiated HepG2 cells as shown by MTT assay. Treatment with BA extracts at 75 μg/ml decreased reactive oxygen species and decreased DNA damage by tail moment of comet assay and expression of γH2AX in situ. BAM significantly decreased gene and protein expression of p53, phospho-p53 (Ser15), and p21 in uv–irradiated HepG2 cells. BA thus efficiently protects cells from DNA damage in vitro. Blueberry may potentially be used as a good source of naturally radioprotective agents.
radioprotective effects of blueberry on the liver of radiation irradiated rats
radiation were seriously damaged on liver functions. Blueberry was fruits that contains Vit A, Vit c, Vit E, follic acid, -carotene, and anthocyanin. The purpose of this study was to evaluate the protection effects of blueberry the liver functions. irradiation dose was used to 4 Gy (Linac 6 Mev) X-ray treatment device Experiment animals was used to 7 rats in each groups. It was investigated liver functions that contains TP, ALB, GLOB, ALT, ALKP and CHOL. We showed that Blueberry was not recovery effects on radiation–induced liver functions. But, Statistically significant value was showed ALB (p>0.01) and ALT (p>0.1). It was concluded that blueberry was not used to recovery materials on radiation–induced liver functions.
The purpose of this study was to explore the effect of blueberry anthocyanins (BA) on radiation–induced lung injury and investigate the mechanism of action. Seven days after BA(20 and 80 mg/kg/d)administration, 6 weeks old male Sprague–Dawley rats rats were irradiated by LEKTA precise linear accelerator at a single dose of 20 Gy only once. and the rats were continuously treated with BA for 4 weeks. Moreover, human pulmonary alveolar epithelial cells (HPAEpiC) were transfected with either control-siRNA or siRNA targeting protein kinase R (PKR). cells were then irradiated and treated with 75 μg/mL BA for 72 h.
Boerhaavia diffusa
The radioprotective effect of the hydro-alcoholic extract of Boerhaavia diffusa was studied using the in vivo mice model. The sublethally irradiated mice (600 rads, single dose) were treated intraperitoneally with 20 mg/kg of the extract. The animals were sacrificed at different time periods after the whole-body radiation. The most affected tissues—bone marrow and intestine—were considerably protected by the intraperitoneal administration of B. diffusa as estimated by bone marrow cellularity, maturing monocytes, and intestinal glutathione. Total white blood cell count was lowered drastically after radiation exposure (ninth day, 1500 ± 500 cells/ mm3). When the animals were exposed to radiation and treated with B. diffusa, the total white blood cell count was lowered only to 4000 ± 400 cells/mm3 on the third day, and it reached an almost normal level (6250 ± 470 cells/mm 3) by the ninth day. The elevated level of serum and liver alkaline phosphatase after radiation exposure was reduced in the B. diffusa—treated group.
Bonnemaisonia hamifera
The present study investigated the photoprotective properties of an ethanol extract derived from the red alga Bonnemaisonia hamifera against ultraviolet B (UVB)-induced cell damage in human HaCaT keratinocytes. The Bonnemaisonia hamifera ethanol extract (BHE) scavenged the superoxide anion generated by the xanthine/xanthine oxidase system and the hydroxyl radical generated by the Fenton reaction (FeSO4 + H2O2), both of which were detected by using electron spin resonance spectrometry. In addition, BHE exhibited scavenging activity against the 1,1-diphenyl-2-picrylhydrazyl radical and intracellular reactive oxygen species (ROS) that were induced by either hydrogen peroxide or UVB radiation. BHE reduced UVB–induced apoptosis, as shown by decreased apoptotic body formation and DNA fragmentation. BHE also attenuated DNA damage and the elevated levels of 8-isoprostane and protein carbonyls resulting from UVB-mediated oxidative stress. Furthermore, BHE absorbed electromagnetic radiation in the UVB range (280–320 nm). These results suggest that BHE protects human HaCaT keratinocytes against UVB–induced oxidative damage by scavenging ROS and absorbing UVB photons, thereby reducing injury to cellular components.
potential applications of radioprotective phytochemicals from marine algae
The use of ionizing radiation and radioactive elements is becoming increasingly popular with the rapid developments in nuclear technology, radiotherapy, and radio diagnostic methods. However, ionizing radiation can directly or indirectly cause life-threatening complications such as cancer, radiation burns, and impaired immunity. Environmental contamination with radioactive elements and the depletion of ozone layer also contribute to the increased levels of radiation exposure. radioprotective natural products have particularly received attention for their potential usefulness in counteracting radiation–induced damage because of their reduced toxicity compared with most drugs currently in use. Moreover, radioprotective substances are used as ingredients in cosmetic formulations in order to provide protection against ultraviolet radiation.
Ganoderma lucidum
radioprotective effect of Ganoderma Lucidum (Leyss, ex. Fr.) Karst after X-ray irradiation in Mice
Six to seven week old male mice of ICR strain were exposed to 500 or 650 cGy of X-ray during experiments to determine if Ganoderma lucidumcould be a factor in modification of radiation damage. Continuous intraperitoneal injection of the extract from Ganoderma lucidum before of after irradiation of 500 or 650 cGy of X-ray was found to improve the 30-day survival fractions of ICR mice, but wasn’t significant by statistical analysis.
The administration also enhanced the recoveries of the body weights and increased the recovery of hemograms of irradiated mice from radiation damage by injecting before or after radiation exposure, especially for the treatment of 500 cGy irradiation. The 10-day CFUs was significantly higher for Ganoderma lucidum treated groups than for untreated groups. However, the differences of radioprotective effect between the X-ray irradiated groups with Ganoderma lucidum pretreated and post-treated were not significant (p>0.05).
radioprotective effect of Ganoderma lucidum polysaccharides on irradiated mice
radiation can cause multiple damages to tissues and organs.This study aimed to explore the protec-tive effect of Ganoderma lucidum polysaccharides ( GLPs) against the 60 Co-γray radiation injury in mice and provide an experimental basis for the clinical use of GLPs. Methods One hundred mice were randomly divided into five groups of equal number normal control, gavage control, radiation control, high-dose GLPs, and low-dose GLPs.Models of radiation injury were made in the mice by whole-body exposure to 60 Co-γrays.Three days before and after mod-eling, the animals in the high-dose and low-dose GLPs groups were given GLPs intragastrically at the dose of 100 and 50 mg/kg respec-tively, once daily for 14 days.Then the 30 day survival rate and sur-vival time of the model mice were recorded and the changes in the pe-ripheral blood index, spleen index, and serum superoxide dismutase( SOD) activity were observed. results GLPs significantly increased the 30-day survival rate and the mean survival time of the mouse models (P<0.05), decreased the reduction of WBC count in the peripheral blood, and shortened the time of WBC restoration ( P<0.05 ).
radioprotective and Anticancer Efficacies of Ganoderma Lucidum in a Mouse tumor Model
Conclusion: Collectively, these results demonstrate the antitumor and radioprotective efficacies of GL, which are likely mediated by protection against oxidative stress and preservation of immune cell populations.
Brownea grandiceps (Jacq.)
radiation enteritis is the most common complication of radiotherapy in patients with pelvic malignancies. Thus, the radioprotective activity of the total hydro-alcoholic extract (BGE) and the ethyl acetate soluble fraction (EAF) of Brownea grandiceps leaves was evaluated against ϒ–radiation–induced enteritis in rats. (BGE) and (EAF) were characterized using HPLC-PDA-ESI-MS/MS analysis. The total phenolic and flavonoid contents were also quantified. In vivo administration of (BGE) (400 mg/kg) and (EAF) (200 & 400 mg/kg) prevented intestinal injury and maintained the mucosal integrity of irradiated rats through increasing villi length and promoting crypt regeneration. Also, (EAF) showed more potent antioxidant activity than (BGE) through reduction of MDA level and enhancement of GSH content and catalase enzyme activity. (BGE) and (EAF) down-regulated intestinal NF-κB expression leading to diminished expression of downstream inflammatory cytokine TNF-α.
Moreover, (EAF) markedly reduced the expression of profibrotic marker TGF-β1. Seventy-nine compounds were tentatively identified, including flavonoids, proanthocyanidins, polar lipids and phenolic acids. (EAF) showed significantly higher total phenolic and flavonoid contents, as compared to (BGE). results revealed remarkable radioprotective activity of (BGE) and (EAF), with significantly higher activity for (EAF). The chemical constituents of (BGE) and (EAF) strongly supported their radioprotective activity. To the best of our knowledge, the present study describes for the first time the radioprotective activity of B. grandiceps leaves in relation to its secondary metabolome fingerprint; emphasizing the great promise of B. grandiceps leaves, especially (EAF), to be used as natural radio-protective agent.
Caffeic acid
In this study, we evaluated whether caffeic acid phenethyl ester (CAPE) has a radioprotective effect on the damage in the rat brain tissue induced by gamma radiation, considering that it may inhibit the ionizing radiation damage.
Methods: A total of 36 Sprague–Dawley rats were divided into four groups to test the radioprotective effect of CAPE administered by intraperitoneal injection. An appropriate control group was also studied. On day 11, the brain tissue of all rats was removed and homogenized in phosphate buffer, and the total antioxidant status (TAS), total oxidant status (TOS), oxidative stress index (OSI), paraoxonase (PON), arylesterase (ARE), ceruloplasmin (CER), lipid hydroperoxide (LOOH), and total-SH parameters were measured to determine if CAPE had a protective effect.
Results: The ARE and PON activity and the total-SH level were statistically increased compared to the IR group, whereas the LOOH, TOS, and OSI levels were significantly decreased.
Conclusion: The data obtained in the study suggest that the CAPE administration prior to irradiation may prevent the irradiation brain damage.
Total body irradiation (TBI) serves as an effectively curative therapy for cancer patients and adversely causes long-term residual bone marrow (BM) injury with premature senescence of hematopoietic stem cells (HSCs), which is mediated by increased production of reactive oxygen species (ROS). In the present study, we investigated how the exposure time of TBI in a mouse model affects HSCs and whether the treatment of caffeic acid (CA), a known dietary phenolic antioxidant, has a radioprotective effect. Single (S)-TBI at a sublethal dose (5 Gy) caused relatively higher induction of mitochondrial ROS and senescence-related factors in HSCs than those in hematopoietic progenitor cells (HPCs) and Lineage–Sca-1+c-Kit+ (LSK) cells, as well as reduced clonogenic formation and donor cell-derived reconstituting capacity. Repetitive double (D)-TBI (two months after the S-TBI at a dose of 5Gy) further weakened HSPC function via mitochondrial ROS accumulation and senescence-associated β-galactosidase (SA-β-gal) activity.
Oral administration of CA (20 mg/kg) five times before and once immediately after TBI ameliorated ROS generation and TBI-induced HSC senescence and its radioprotective effect was long lasting in S-TBI mice but not in D-TBI mice. Further, supplementation of CA also induced apoptotic cell death of colon cancer cells.
Collectively, these findings indicate that CA has a dual effect, ameliorating HSC senescence-accompanied long-term BM injury in S-TBI mice and stimulating apoptotic cell death of colon cancer cells.
Head and neck cancer patients treated with radiotherapy suffer severe side effects during and following their treatment. Efforts to decrease toxicity of irradiation to normal tissue, organs and cells have led to searching for cytoprotective agent. Investigations for effective and non-toxic compounds with radioprotective capability led to increasing interest in antioxidant such as Propolis and Caffeic acid phenethyl ester (CAPE). The aim of this study was to evaluate the antioxidant and radioprotective effects of Propolis and CAPE on radiation–induced oxidative/nitrosative stress in the brain tissue. Fourty Sprague-Dawley rats were randomly divided into five groups. Group 1 (irradiation (IR) + Propolis) received total cranium irradiation and propolis was given orally through an orogastric tube daily. Group 2 (IR+CAPE) received total cranium irradiation plus CAPE, was dissolved in dimethyl sulfoxide (DMSO) just before giving to the rats, intraperitoneally (IP) every day. Group 3 (IR) received 5 Gy of gamma irradiation as a single dose to total cranium plus 1 ml saline daily. Group 4 received daily plain DMSO. Group 5 received daily plain saline. At the end of the 10 day time period, xanthine oxidase (XO), nitric oxide synthase (NOS) activities, nitric oxide (NO●) and peroxynitrite (ONOO–) levels were significantly higher in IR group compared to all other groups.
In conclusion, the results suggest the radioprotective ability of Propolis and CAPE involving prevention of radiation–induced oxidative/nitrosative damage.
calendula officinalis
This study was designed to determine the effect of Calendula officinalis flowers extract mouthwash as oral gel on radiation–induced oropharyngeal mucositis (OM) in patients with head-and-neck cancer. Forty patients with neck and head cancers under radiotherapy or concurrent chemoradiotherapy protocols were randomly assigned to receive either 2% calendula extract mouthwash or placebo (20 patients in each group). Patients were treated with telecobalt radiotherapy at conventional fractionation (200 cGy/fraction, five fractions weekly, 30–35 fractions within 4–7 weeks). The oropharyngeal mucositis was evaluated by two clinical investigators (a radiation oncologist and a dentist), using the oral mucositis assessment scale (OMAS). Trying to find out the possible mechanism of action of the treatment, total antioxidant, polyphenol and flavonoid contents, and quercetin concentration of the mouth wash were measured. Calendula mouthwash significantly decreased the intensity of OM compared to placebo at week 2 (score: 5.5 vs. 6.8, p = 0.019), week 3 (score: 8.25 vs. 10.95, p < 0.0001) and week 6 (score: 11.4 vs. 13.35, p = 0.031).
To determine the effect of Calendula officinalis flower extract mouthwash as gel formulation on radiation–induced oropharyngeal mucositis (OM) in patients with head-and-neck cancer. Forty patients with neck and head cancers who were treated with radiotherapy or chemoradiotherapy were randomly assigned to receive either 2% calendula extract mouthwash or placebo (20 patients in each group). The subjects were treated with telecobalt radiotherapy at conventional fractionation (2 Gy/fraction, five fractions weekly, 20–35 fractions within 4–7 weeks). Oropharyngeal mucositis was evaluated by two doctors (a radiation oncologist and a dentist), using the oral mucositis assessment scale (OMAS). The patients also received concurrent chemotherapy. Calendula mouthwash significantly decreased the intensity of OM compared to placebo at week 2 (score: 5.5 vs. 6.8, p = 0.019), week 3 (score: 8.25 vs. 10.95, p < 0.0001) and week 6 (score: 11.4 vs. 13.35, p = 0.031).
Conclusion: This randomised controlled trial showed no difference between Calendula and standard of care (Sorbolene) for the prevention of radiation–induced dermatitis. However, the study was underpowered (limited recruitment) for the primary comparison.
Camellia sinensis
Positive health effects of tea (Camellia sinensis) on a wide range of physiological problems and diseases are well known and are in part due to its copious antioxidant content. The effect of black tea extract (BTE), which is rich in polyphenolic antioxidants, against the consequences of radiation exposure has not been properly identified. The functional properties of BTE were analyzed and its radioprotective effect on V79 cells was explored in the present study. BTE scavenged free radicals and inhibited Fenton reaction-mediated 2-deoxyribose degradation and lipid peroxidation in a dose-dependent fashion, establishing its antioxidant properties.
The radioprotective effects of BTE on strand break induction in pBR322 plasmid DNA were 100 % at 80 μg/ml and higher. In V79 cells, BTE was effective in decreasing the frequency of radiation–induced micronucleated cells and the yields of reactive oxygen species (ROS) and also in restoring the integrity of cellular mitochondrial membrane potential significantly. BTE exerted maximum protection against radiation–induced damage in V79 at a dose of 5 μg/ml. Due to the functional properties of BTE-flavonoids, which have been identified by HPLC, it is envisaged that the key player in radioprotection is elimination of ROS.
We evaluated the effects green and mate teas on oxidative and DNA damages in rats exposed to ultraviolet radiation. Were utilized 70 adult male Wistar rats that received daily oral or topic green or mate tea treatment during exposed to radiation by seven days. After, animals were killed by decapitation. Thiobarbituric acid-reactive species levels, protein oxidative damage were evaluated in skin and DNA damage in blood. Our results show that the rats exposed to ultraviolet radiation presented DNA damage in blood and increased protein carbonylation and lipid peroxidation in skin. Oral and topic treatment with green tea and mate tea prevented lipid peroxidation, both treatments with mate tea also prevented DNA damage. However, only topic treatment with green tea and mate tea prevented increases in protein carbonylation.
Our findings contribute to elucidate the beneficial effects of green tea and mate tea, here in demonstrated by the antioxidant and antigenotoxic properties presented by these teas.
Chamomile (Matricaria recutita L.
effect of a chamomile extract in protecting against radiation‐induced intestinal mucositis
Compounds that prevent radiation–induced mucositis may offer new therapeutic strategies for maintaining intestinal integrity in patients undergoing radiotherapy. A specially formulated chamomile extract was studied with the hope of proving efficacy in this regard. Intestinal mucositis was induced in rats by exposing them to whole body gamma–irradiation. Rats were treated orally with the extract for 5 days before and 2 days after radiation exposure. One day later, rats were sacrificed. Histological examination of segments of small intestine showed shortening and fusion of villi, activation of mucus secreting glands, inflammatory cell infiltration of lamina propria, and mucosal atrophy. Intestinal homogenates showed an increase in tumor necrosis factor, a pro-inflammatory cytokine, and myeloperoxidase, an indicator of cellular infiltration, as well as in thiobarbituric acid reactive substances and a reduction in glutathione content. Intestinal injury was further evidenced by an increase in diamine oxidase and a reduction in citrulline levels in the serum. A rise in apoptosis was evidenced by an increase in cytosolic cytochrome c, caspase-3, and depletion of mitochondrial B-cell lymphoma-2/ Bax ratio.
Most histological changes and associated derangement in related parameters were largely prevented by the chamomile extract, thus paving the way to a new therapeutic approach towards the management of radiation–induced intestinal mucositis.
Conclusion: Chamomile had no prophylactic effect on the onset of oral mucositis, but it was proven to be effective in decreasing the severity of this condition during treatment in most patients
Tea is a traditional plant extract with important cultural ties. It is the most widely consumed beverage in the world. Tea consumption has some health benefits including antioxidant stimulus. gamma radiation is currently used to control of postharvest pathogens on tea herb. However, free radicals can be generated, which consumes antioxidant molecules. A positive relation was found between radiation doses used and free radicals generation in green tea (Camellia sinensis), yerba mate (Ilex paraguariensis), and chamomile tea (Matricaria recutita).
Total antioxidant capacity (TAC) of aqueous and methanol extracts of these herbs was determined by various methods to compare the effect of irradiation of herb on antioxidant capacity of the extracts. TAC was evaluated by measuring: total phenols (decreased with irradiation in mate and green teas), total flavonoids (stable in aqueous extracts and decreased with irradiation in methanol extract of mate and chamomile), Trolox equivalent or ABTS (unchanged under irradiation), DPPH* scavenging capacity (stable on aqueous extract but diminished in methanol extract after irradiation), β carotene/acid linoleic ability (stable with the exception of chamomile tea that increased after irradiation) and, capacity to chelate ferrous ions (unchanged with irradiation). In conclusion, gamma irradiation reduced the capacity of some antioxidants but preserved the capacity of others.
Chrysanthemum indicum L.
Wild chrysanthemum extract prevents UVB radiation–induced acute cell death and photoaging
Wild chrysanthemum (Chrysanthemum indicum L.) is traditionally used in folk medicine as an anti-inflammatory agent. It is also used in the southwest plateau region of China to prevent ultraviolet–induced skin damage. However, the role and mechanism by which wild chrysanthemum prevents uv–induced skin damage and photoaging have never been investigated in vitro. In the present study, we found that aqueous extracts from wild chrysanthemum strongly reduced high-dose UVB–induced acute cell death of human immortalized keratinocytic HaCat cells. Wild chrysanthemum extract was also demonstrated to reduce low-dose UVB–induced expression of the photoaging-related matrix metalloproteinases MMP-2 and MMP-9. The ROS level elevated by UVB irradiation was strongly attenuated by wild chrysanthemum extract.
It is known that solar ultraviolet (uv) radiation to human skin causes photo-aging, including increases in skin thickness and wrinkle formation and reduction in skin elasticity. uv radiation induces damage to skin mainly by superfluous reactive oxygen species and chronic low-grade inflammation, which eventually up-regulate the expression of matrix metalloproteinases (MMPs). In this study, the super-critical carbon dioxide extract from flowers and buds of Chrysanthemum indicum Linnén (CISCFE), which has been reported to possess free radical scavenging and anti-inflammatory properties, was investigated for its photo-protective effect by topical application on the skin of mice.
Chrysophyllum cainito L
This study aimed to evaluate the possibility of using the crude methanolic extract of Chrysophyllum cainito L. leaves (C. cainito L.); as a source of natural antioxidant compounds; to compensate the oxidative stress induced by ionizing radiation exposure in male rats. Phytochemical investigations of C. cainito L. leaves extract led to the isolation of phytocobstituents such as: Gallic acid (1), together with six flavonoids; 3//Galloyl myrecetrin (2), Rutin (3), Quercetrin (4), Myrecetrin (5), Myricetin (6), and Quercetin (7). In addition to two triterpenoids; β –amyrin (8), and Lupeol (9). All metabolites were isolated for the first time from the genus Chrysophyllum. The structures were determined by spectroscopic methods (uv, ESI-MS, 1H and 13CNMR).
These compounds reflected its beneficial effect to ameliorate the alterations induced by γ-irradiation via the adjustment of the antioxidant status, decreasing of MDA level, and an improvement in liver, kidney functions and lipid profile, as well as histological alterations of liver were reduced. We can conclude that C. cainito L. extract reduces the liver and kidney toxicity induced by exposure to gamma radiation.
Clerodendron infortunatum
Several phytoceuticals and extracts of medicinal plants are reported to mitigate deleterious effects of ionizing radiation. The potential of hydro-alcoholic extract of Clerodendron infortunatum (CIE) for providing protection to mice exposed to gamma radiation was investigated. Oral administration of CIE bestowed a survival advantage to mice exposed to lethal doses of gamma radiation. radiation–induced depletion of the total blood count and bone marrow cellularity were prevented by treatment with CIE. damage to the cellular DNA (as was evident from the comet assay and the micronucleus index) was also found to be decreased upon CIE administration.
prevention of ionizing radiation induced damages by Clerodendron infortunatum
Several phytoceuticals and extracts of medicinal plants are reported to mitigate deleterious effects of ionizing radiation. The potential of hydro-alcoholic extract of Clerodendron infortunatum (CIE) was investigated for providing protection to mice exposed to gamma radiation. Oral administration of CIE bestowed survival advantage to mice exposed to lethal doses of gamma–radiation. The radiation – induced depletion of total blood count and bone marrow cellularity were prevented by treatment with CIE. The damage to cellular DNA, as evidenced from comet assay, and micronucleus index was also found to be decreased upon CIE administration. radiation induced damages to intestinal crypt cells was also reduced by CIE. Studies on gene expression in intestinal cells revealed that there was a marked increase in bax/bcl-2 ratio in mice exposed to whole body 4 Gy gamma radiation and administration of CIE resulted in significant lowering of this ratio, suggestive of reduction of radiation induced apoptosis.
Codonopsis pilosula
With rapidly increased construction of nuclear power plants worldwide to reduce energy shortage and subsequent environment contamination, routine use of radiotherapy and radiodiagnosis equipment in the clinical medicine, the research on the health effect of radiation exposure has become a very important area to explore. Traditional Chinese medicine (TCM) may be an ideal candidate therapy as it usually produces fewer side effects even with long-term administration. In this paper, we reviewed current therapeutic approaches to prevent radiation–induced brain neuropathological and functional changes.
crocetin from gardenia fruit
A strategy for attenuation of acute radiation–induced lung injury using crocetin from gardenia fruit
Conclusion: Crocetin inhibits necroptosis through transcriptional regulation of the Tnfrsf10b gene, thereby preventing radiation–induced lung injury. This work may provide a new strategy for the prevention of lung radiation injury by the extract from Chinese herbal medicine.
protective effects of crocetin against radiation–induced injury in intestinal epithelial cells
Background and Aims: treatment options for radiation–induced intestinal injury (RIII) are limited. Crocetin has been demonstrated to exert antioxidant, antiapoptotic, and anti-inflammatory effects on various diseases. Here, we investigate the effects of crocetin on RIII in vitro.
Materials and Method: IEC-6 cells exposed to 10 Gy of radiation were treated with different doses of crocetin (0, 0.1, 1, 10, and 100 μM), and cell viability was assessed by CCK-8. The levels of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), malondialdehyde (MDA), myeloperoxidase (MPO), tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interferon-γ (IFN-γ) in culture supernatants were measured using colorimetric and ELISA kits, respectively. cellular apoptosis was evaluated by Annexin V/PI double staining.
Results: Crocetin dose-dependently improved the survival of irradiated IEC-6 cells with the optimal dose of 10 μM, as indicated by the reduction of cellular apoptosis, decreased levels of MDA, MPO, and proinflammatory cytokines (TNF-α, IL-1β, and IFN-γ), and increased activities of antioxidative enzymes (SOD, CAT, and GPx).
Conclusion: Our findings demonstrated that crocetin alleviated radiation–induced injury in intestinal epithelial cells, offering a promising agent for radioprotection.
radiation and crocetin therapy for cancer
This thesis is concerned with the effect of crocetin on the radiosensitivity of cancer. It is also concerned with a study of the mechanism of action of crocetin, which presumably increases radiosensitivity by increasing oxygen diffusivity. In vivo studies were conducted using a Walker-256 carcinoma grown in the thigh muscles of male Sprague-Dawley rats. The minimum dose of X-rays necessary to induce cancer regression was first determined. It was then found that lower dosages of irradiation would also cure the tumors provided crocetin was also given to the animals.
Curcuma longa
radioprotective effect of Curcuma longa extract on γ-irradiation–induced oxidative stress in rats
This study was conducted to evaluate the modulatory effect of aqueous extract of species“>Curcuma longa (L.) against γ-irradiation (GR), which induces biochemical disorders in male rats. The sublethal dose of GR was determined in primary hepatocytes. Also, the effect of C. longa extract was examined for its activity against GR. In rats, C. longa extract was administered daily (200 mg/kg body mass) for 21 days before, and 7 days after GR exposure (6.5 Gy). The lipid profile and antioxidant status, as well as levels of transaminases, interleukin-6 (IL-6), and tumour necrosis factor α (TNFα) were assessed. The results showed that in hepatocytes, the aqueous extract exhibited radioprotective activity against exposure to GR. exposure of untreated rats to GR resulted in transaminase disorders, lipid abnormalities, elevation of lipid peroxidation, trace element alterations, release of IL-6 and TNF, and decrease in glutathione and protein level of superoxide dismutase-1 (SOD-1) and peroxiredoxin-1 (PRDX-1).
Conclusion: These findings demonstrate that curcumin can be used as an effective radioprotective agent to inhibit acute and chronic effects, but not mortality, after irradiation.
EGCG
Excessive reactive oxygen radicals (ROS) produced by ionizing radiation (IR) can cause human body to serious oxidative damage, leading to oxidation-reduction (REDOX) system imbalance and immune system damage. Here, the radioprotection of EGCG was studied through a model of oxidative damage in 60Coγ radiation mice. Firstly, the weights and the main organs indexes of mice, including the liver index, spleen index and pancreas index, indicated preliminarily the safety and protection of EGCG. Then, the radioprotection of EGCG based on immune-regulation on radiation mice was further investigated.
Conclusion: This trial confirmed that the oral administration of EGCG is an effective and safe method to deal with ARIE. A phase III randomized controlled trial is expected to further corroborate the consequence of EGCG in ARIE treatment.
EGCG, a tea polyphenol, as a potential mitigator of hematopoietic radiation injury in mice
Agents capable of providing protection, mitigation or therapy against radiation injuries have long been of interest of radiation biologists owing to the ever expanding application of radiation in our day to day life despite the well reported ill effects of exposure. The current study investigates radiomitigating potential of EGCG (epigallocatechin gallate), a tea polyphenol with known DNMT inhibitory property, in C57 Bl/6 mice model. treatment with 0.1833 mg/kg body weight EGCG, 1.5 h post-irradiation to lethally whole body irradiated mice rendered 45% survival for 30 days and also helped restoring the body weight of the animals. An early recovery of various hematological parameters was observed in EGCG treated animals compared to radiation alone group.
Emblica officinalis
protective effect of an extract of Emblica officinalis against radiation–induced damage in mice
The radioprotective effect of Emblica officinalis extract (EOE) was studied in mice. Swiss albino mice were exposed to γ rays (5 Gy) in the absence (control) or presence (experimental) of EOE, orally 100 mg/kg body weight, once daily for 7 consecutive days. A specimen of small intestine (jejunum) was removed from the mice and studied at different autopsy intervals from 12 hours to 30 days. In control animals, crypt cell population, mitotic figures, and villus length were markedly reduced on day 1; these later started to increase progressively but did not attain the normal level even at the last autopsy interval. The animals receiving EOE prior to irradiation had a higher number of crypt cells and mitotic figures when compared with non-drug-treated control at all the autopsy intervals.
irradiation of animals resulted in a dose-dependent elevation in lipid peroxidation and a reduction in glutathione as well as catalase concentration in the intestine at 1 hour post-irradiation. In contrast, EOE treatment before irradiation caused a significant depletion in lipid peroxidation and elevation in glutathione and catalase levels.
The radio protective effect of the fruit pulp of Emblica officinalis Gaertn (Emblica) was studied in adult Swiss albino mice. Mice were treated with 2.5g/kg b.wt of Emblica for 10 consecutive days before irradiation and exposed to a single dose of 700 rads (7Gy) of radiation after the last dose. One group was given Emblica continuously for another 15 days after irradiation. Changes in the total leukocyte count, bone marrow viability and hemoglobin were studied after whole body irradiation. Administration of Emblica significantly increased these levels, which were lowered by irradiation. Animals were sacrificed at various time points after irradiation and the activities of the antioxidant enzymes catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPX), and glutathione-S-transferase (GST), and levels of glutathione were assayed in the blood. The damage to the cell membrane after whole body irradiation was studied by measuring the tissue lipid peroxides levels.
Medicinal plants and their products are often prone to microbial contamination. gamma irradiation is a well-recognized phytosanitary treatment for the elimination of bacteria, moulds and insects. The present study was carried out to see the effect of gamma radiation treatment on the proximate nutrients, ascorbic acid, tannins, saponins, flavonoids, phenolics and alkaloidal content, as well as on the DPPH radical scavenging activity of Emblica officinalis. The radiation treatment up to the dose level of 12 kGy showed increase in the levels of phenolics and flavonoids.
Empetrum nigrum
The ethylacetate fraction of Empetrum nigrum var. japonicum (ENE) was shown to reduce intracellular reactive oxygen species (ROS) generated by γ-radiation and activate antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT), and gluthathion peroxidase (GPx). ENE protected cells against radiation–induced cellular DNA damage, membrane lipid peroxidation, and protein modification, which are the main points of radiation–induced damage. In addition, ENE recovered cell viability by inhibiting apoptosis after cells were treated with radiation. ENE treatment also reduced γ-radiation induced Bax, and caspase 9 and 3 expression in irradiated cells.
This study focused on the protective actions of Empetrum nigrum against ultraviolet B (UVB) radiation in human HaCaT keratinocytes. An ethyl acetate extract of E. nigrum (ENE) increased cell viability decreased by exposure to UVB rays. ENE also absorbed UVB radiation and scavenged UVB–induced intracellular reactive oxygen species (ROS) in HaCaT keratinocytes. In addition, ENE shielded HaCaT keratinocytes from damage to cellular components (e.g., peroxidation of lipids, modification of proteins, and breakage of DNA strands) following UVB irradiation.
Furthermore, ENE protected against UVB–induced apoptotic cell death, as determined by a reduction in the numbers of apoptotic bodies and sub-G1 hypodiploid cells, as well as by the recovery of mitochondrial membrane potential. The results of the current study therefore suggest that ENE safeguards human keratinocytes against UVB–induced cellular damage via the absorption of UVB ray and scavenging of UVB-generated ROS.
Epicatechin
The modulation of longevity genes and aging-associated signaling pathways using pharmacological agents is one of the potential ways to prolong the lifespan and increase the vitality of an organism. Phytochemicals flavonoids and non-steroidal anti-inflammatory drugs have a large potential as geroprotectors. The goal of the present study was to investigate the effects of long-term and short-term consumption of quercetin, (-)-epicatechin, and ibuprofen on the lifespan, resistance to stress factors (paraquat, hyperthermia, γ-radiation, and starvation), as well as age-dependent physiological parameters (locomotor activity and fecundity) of Drosophila melanogaster. The long-term treatment with quercetin and (-)-epicatechin didn’t change or decreased the lifespan of males and females. In contrast, the short-term treatment with flavonoids had a beneficial effect and stimulated the resistance to paraquat and acute γ-irradiation.
radioprotective effect of epicatechin in cultured human fibroblasts and zebrafish
radiation–induced normal cell damage limits the delivery of high-dose radiation to targeted cancer. This study investigated the effect of epicatechin (EC), a minor component of green tea extracts, on radiation–induced cellular damage in vitro in primary cultured human fibroblasts and in vivo in a zebrafish model. cell viability, proliferation and wound-healing efficacy, mitochondrial membrane potential, and reactive oxygen species (ROS) generation as well as changes in the signaling pathway related to apoptosis were investigated in fibroblasts.
The therapeutic effects of EC were explored in a zebrafish model. EC increased clonogenic survival and restored the migration ability of the fibroblasts after irradiation. EC inhibited radiation–induced ROS generation, mitochondrial dysfunction and cell death. EC significantly reduced the expression of p-JNK, p-38, and cleaved caspase-3 compared with their significant increase after radiation treatment. EC attenuated the radiation–induced embryotoxicity in a zebrafish model.
effect of Epicatechin against radiation–induced Oral Mucositis: In Vitro and In Vivo study
Conclusion: This study suggests that EC significantly inhibited radiation–induced apoptosis in keratinocytes and rat oral mucosa and may be a safe and effective candidate treatment for the prevention of radiation–induced mucositis.
Ferulic acid
Our previous study showed that ferulic acid (FA) offered good radioprotection under in vitro and in vivo conditions to DNA and enhanced the DNA repair process in the peripheral blood leucocytes of mice in vivo. This study concerns radioprotection of normal versus tumor cells. Administration of FA (50 mg/kg body weight) to mice bearing fibrosarcoma tumor, 1 h prior to/ or immediately after radiation exposure (4 Gy) showed preferential radioprotection to normal cells i.e. peripheral blood leucocytes and bone marrow cells in comparison to tumor cells. This preferential protection under in vivo conditions could be attributed to poor vasculature in the tumor or peculiar characteristics of the tumor cells either to restrict its entry inside the cells or metabolize or inactivate the drug. To resolve these ex vivo study was carried out using bone marrow and tumor cells. It was found that under ex vivo condition also only bone marrow cells were protected by FA. Thus the studies revealed that FA showed preferential protection to normal cells under both in vivo and ex vivo conditions. (Mol cell Biochem xxx: 1–10, 2005)
radiation protection of DNA by ferulic acid under in vitro and in vivo conditions
The effect of ferulic acid was studied on γ-radiation–induced relaxation of plasmid pBR322 DNA and induction of DNA strand breaks in peripheral blood leukocytes and bone marrow cells of mice exposed to whole body γ-radiation. Presence of 0.5 mM ferulic acid significantly inhibited the disappearance of supercoiled (ccc) plasmid pBR322 with a dose modifying factor (DMF) of 2.0. Intraperitoneal administration of different amounts (50, 75 and 100 mg/kg body weight) of ferulic acid 1 h prior to 4 Gy γ-radiation exposure showed dose-dependent decrease in the yield of DNA strands breaks in murine peripheral blood leukocytes and bone marrow cells as evidenced from comet assay. The dose-dependent protection was more pronounced in bone marrow cells than in the blood leukocytes.
Role of ferulic acid in the amelioration of ionizing radiation induced inflammation: a murine model
Ionizing radiation is responsible for oxidative stress by generating reactive oxygen species (ROS), which alters the cellular redox potential. This change activates several redox sensitive enzymes which are crucial in activating signaling pathways at molecular level and can lead to oxidative stress induced inflammation. Therefore, the present study was intended to assess the anti-inflammatory role of ferulic acid (FA), a plant flavonoid, against radiation–induced oxidative stress with a novel mechanistic viewpoint. FA was administered (50 mg/kg body wt) to Swiss albino mice for five consecutive days prior to exposing them to a single dose of 10 Gy 60Co γ-irradiation. The dose of FA was optimized from the survival experiment and 50 mg/kg body wt dose showed optimum effect.
Ficus racemosa
Ficus racemosa stem bark extract: a potent antioxidant and a probable natural radioprotector
Ethanol extract (FRE) and water extract (FRW) of Ficus racemosa (family: Moraceae) were subjected to free radical scavenging both by steady state and time resolved methods such as nanosecond pulse radiolysis and stopped-flow spectrophotometric analyses. FRE exhibited significantly higher steady state antioxidant activity than FRW. FRE exhibited concentration dependent DPPH, ABTS•-, hydroxyl radical and superoxide radical scavenging and inhibition of lipid peroxidation with IC50 comparable with tested standard compounds. In vitro radioprotective potential of FRE was studied using micronucleus assay in irradiated Chinese hamster lung fibroblast cells (V79). pretreatment with different doses of FRE 1h prior to 2 Gy γ-radiation resulted in a significant (P < 0.001) decrease in the percentage of micronucleated binuclear V79 cells. Maximum radioprotection was observed at 20 μg/ml of FRE. The radioprotection was found to be significant (P < 0.01) when cells were treated with optimum dose of FRE (20 μg/ml) 1 h prior to 0.5, 1, 2, 3 and 4 Gy γ-irradiation compared to the respective radiation controls. The cytokinesis-block proliferative index indicated that FRE does not alter radiation induced cell cycle delay.
The genus Ficus is a very useful and significant group of trees with various therapeutic properties. Ficus racemosa linn. is a standard-sized tree in the Moraceae family, often known as the cluster fig tree. Ficus racemosa is also known as yajnayoga, udumbara, goolar, dumar, bodda, heibong, jantuphalam, dimri, yogga dumur, and many more names. Ficus racemosa may be found in various countries, including Australia, Malaysia, South-East Asia, Sri Lanka, Pakistan, China, New South Wales, and the Indian subcontinent. It grows naturally near bodies of water but may also be grown artificially. Ficus racemosa is a plant referenced in the old Ayurvedic, Siddha, Unani and Homeopathic traditions with various medicinal activities like as, antidiuretic, antitussive, antiulcer or gastro-protective, anti-oxidant activity, anthelmintic, antibacterial, antipyretic, anticholinesterase, potential Anticancer activity, antifilarial, wound healing, antidiarrheal, anti-inflammatory, antiulcer, analgesic, hepatoprotective, radioprotective, fungicidal, hypoglycemic, hypolipidemic, larvicidal, renal anticarcinogenic, cognitive enhancing, and other properties.
French maritime pine bark extract, Flavangenol
A French maritime pine bark extract, Flavangenol®, is widely used as a nutritional supplement for protection against atherosclerosis, hypertension, diabetes, etc. Chronic exposure to solar uv radiation damages skin, increasing cutaneous thickness, wrinkling and pigmentation, as well as reducing elasticity, and causes skin cancer. The aim of this study was to examine the effects of flavangenol on skin damage and the incidence of skin tumors caused by long-term UVB irradiation in melanin-possessing hairless mice. The oral administration of flavangenol (60, 200 or 600 mg kg−1, twice daily) significantly inhibited increases in skin thickness, and the formation of wrinkles and melanin granules, as well as increases in the diameter and length of skin blood vessels.
Fucodiphlorethol G purified from Ecklonia cava
Fucodiphlorethol G (6’-[2,4-dihydroxy-6-(2,4,6-trihydroxyphenoxy)phenoxy]biphenyl-2,2’,4,4’,6-pentol) is a compound purified from Ecklonia cava, a brown alga that is widely distributed offshore of Jeju Island. This study investigated the protective effects of fucodiphlorethol G against oxidative damage-mediated apoptosis induced by ultraviolet B (UVB) irradiation. Fucodiphlorethol G attenuated the generation of 2, 2-diphenyl-1-picrylhydrazyl radicals and intracellular reactive oxygen species in response to UVB irradiation. Fucodiphlorethol G suppressed the inhibition of human keratinocyte growth by UVB irradiation. Additionally, the wavelength of light absorbed by fucodiphlorethol G was close to the UVB spectrum. Fucodiphlorethol G reduced UVB radiation–induced 8-isoprostane generation and DNA fragmentation in human keratinocytes. Moreover, fucodiphlorethol G reduced UVB radiation–induced loss of mitochondrial membrane potential, generation of apoptotic cells, and active caspase-9 expression.
protective effect of Triphlorethol-A from Ecklonia cava against Ionizing radiation in vitro
We studied the cytoprotective effect of triphlorethol-A against γ-ray radiation– induced oxidative stress. In this study, hydrogen peroxide, which is a reactive oxygen species (ROS), was detected using 2′,7′-dichlorodihydrofluorescein diacetate (DCF-DA) assay. Triphlorethol-A reduced intracellular hydrogen peroxide generated by γ-ray radiation. This compound provided protection against radiation–induced membrane lipid peroxidation and cellular DNA damage which are the main targets of radiation–induced damage. Triphlorethol-A protected the cell viability damaged by the radiation through inhibition of apoptosis. Triphlorethol-A reduced the expression of bax and activated caspase 3 induced by radiation, but recovered the expression of bcl-2 decreased by radiation.
Taken together, the results suggest that triphlorethol-A protects cells against oxidative damage induced by radiation through reducing ROS.
garlic
Conclusion: It can be stated that garlic is may be recommended to be sufficiently included in the diets of radiotherapy patients considering its antioxidant and antimicrobial efficacy.
To evaluate a radioprotective effect of sodium n-propyl thiosulfate (NPTS) and sodium 2-propenyl thiosulfate (2PTS) derived from onions and garlic, respectively, rat hepatoma H4IIE cells and mouse lymphoma L5178Y cells were preincubated with each of these compounds for 48 hours at 37°C before receiving 10 Gy of X-ray irradiation. cell damage caused by the irradiation was quantified as comet tail moment, which represents the degree of DNA damage. X-ray-induced DNA damage was significantly decreased in both H4IIE and L5178Y cells by micromolar concentrations of NPTS and 2PTS compared with the control without the compounds.
The protective effect was more potent with 2PTS than NPTS. Onions and garlic have anti-radiation potential.
The radioprotective effect of garlic on four bacterial strains with different degrees of radiation sensitivities was investigated. The presence of garlic led to an increase in d-10 value of Ps. Aeruginosa, S. aureus and S. typhimurium by 160%, 50%, and 30% respectively. The protective efficiency of garlic against radiation was noticed to be proportional to its concentration in a given inoculum size. Garlic extract up to 180 micro liter per 108 inoculum size of B. cereus showed no protective effect. This fact was attributed to the existence of sulphur compounds in the given strain. Higher garlic concentrations appeared to affect the cloning efficiency of a given strain.
Genistein
Conclusion: In this review, we examine the role of flavonoids as potential radiosensitizers, review the underlying molecular mechanisms and discuss their potential usefulness in improving cancer radiotherapy. It is emphasized that obtaining a deeper insight into the molecular mechanisms underlying the combined action of flavonoids and ionizing radiation may provide new directions for radiobiological research applicable to the much needed enhanced selective tumor cytotoxicity to treatment agents.
radioprotective effects of genistein on HL-7702 cells via the inhibition of apoptosis and DNA damage
radiation induced normal tissue damage is the most important limitation for the delivery of a high potentially curative radiation dose. Genistein (GEN), one of the main soy isoflavone components, has drawn wide attention for its bioactivity in alleviating radiation damage. However, the effects and molecular mechanisms underlying the radioprotective effects of GEN remain unclear. In the present study, we showed that low concentration of GEN (1.5 µM) protected L-02 cells against radiation damage via inhibition of apoptosis, alleviation of DNA damage and chromosome aberration, down-regulation of GRP78 and up-regulation of HERP, HUS1 and hHR23A. In contrast, high concentration of GEN (20 µM) demonstrated radiosensitizing characteristics through the promotion of apoptosis and chromosome aberration, impairment of DNA repair, up-regulation of GRP78, and down-regulation of HUS1, SIRT1, RAD17, RAD51 and RNF8.
Genistein As radioprotective Against Premature Ovarian Failure
Radiotherapy is one of the most important strategies in cancer treatment. Seriously, radiotherapy resulted in premature ovarian failure (POF) and infertility, Radiotherapy depends on the generation of reactive oxygen species (ROS) in cancer cells as a result of water radiolysis leading to induction of oxidative stress and diminution of antioxidant defense mechanisms and within this process, healthy tissues are also damaged. Moreover, germ cells seem to be much more susceptible to oxidative stress induced by radiotherapy than somatic cells. Seriously, ROS generated by ionizing radiation are capable of inducing tissue apoptosis by direct and indirect pathways leading to oxidative damage of cellular macromolecules (mainly DNA, proteins and lipids). Curiously, apoptosis was identified as the mechanism responsible for oocyte loss caused by radiotherapy. Soybeans products contain high amounts of isoflavones known as soy phytoestrogens which act as natural selective estrogen receptor modulators (SERMs). The most prominant phytoestrogen in soybean is genistein (GEN), which shows estrogenic properties through estrogen receptor beta (ER-β) binding. GEN has different pharmacological properties through its chemoprotective activity against cancers and cardiovascular diseases. GEN was also reported to protect against acute myelotoxicity, intestinal, lung, and testicular injuries-induced by radiation.
Geraniin
The radioprotective effect of geraniin, a tannin compound isolated from Nymphaea tetragona Georgi var. (Nymphaeaceae), against γ-radiation–induced damage was investigated in Chinese hamster lung fibroblast (V79-4) cells. Geraniin recovered cell viability detected by MTT test and colony formation assay, which was compromised by γ-radiation, and reduced the γ-radiation–induced apoptosis by the inhibition of loss of the mitochondrial membrane potential. Geraniin protected cellular components (lipid membrane, cellular protein, and DNA) damaged by γ-radiation, which was detected by lipid peroxidation, protein carbonyl formation, and comet assay. Geraniin significantly reduced the level of intracellular reactive oxygen species generated by γ-radiation, which was detected using spectrofluorometer, flow cytometer, and confocal microscope after 2′,7′-dichlorodihydrofluorescein diacetate staining. Geraniin normalized the superoxide dismutase and catalase activities, which were decreased by γ-radiation. These results suggest that geraniin protects cells against radiation–induced oxidative stress via enhancing of antioxidant enzyme activities and attenuating of cellular damage.
Geraniin down regulates gamma radiation–induced apoptosis by suppressing DNA damage
gamma ray irradiation triggers DNA damage and apoptosis of proliferating stem cells and peripheral immune cells, resulting in the destruction of intestinal crypts and lymphoid system. Geraniin is a natural compound extracts from an aquatic plant Nymphaea tetragona and possesses good antioxidant property. In this study, we demonstrate that geraniin rescues radiosensitive splenocytes and jejunal crypt cells from radiation–induced DNA damage and apoptosis. Isolated splenocytes from C57BL/6 mice treated with geraniin were protected against radiation injury of 2 Gy irradiation through the enhancement of the proliferation and attenuation of DNA damage. Also, geraniin inhibited apoptosis in radiosensitive splenocytes by reducing the expression level and immunoreactivity of proapoptotic p53 and Bax and increasing those of anti-apoptotic Bcl-2. In mice exposed to radiation, geraniin treatment protected splenocytes and intestinal crypt cells from radiation–induced cell death.
Geraniin Promotes Recovery of Hematopoietic cells after radiation Injury
cells of the hematopoietic system are uniquely radiosensitive due to their rapid proliferation. Consequently, immune suppression readily and undesirably results from irradiation. Our previous studies demonstrated that geraniin isolated from Nymphaea tetragona var. angusta (water lily) had a protective effect on the splenocytes and intestinal tract of irradiated mice. This study was designed to assess the effectiveness of geraniin, an ellagitannin isolated from the water lily, in decreasing gamma ray irradiation–induced destruction of the hematopoietic system in mice. Geraniin treatment improved the survival time of bone marrow cells and maintained bone marrow integrity and also up-regulated the expression of stem cell receptors and the extent of cell mitosis. Geraniin also enhanced the proliferation and differentiation of immune cells that had been suppressed by irradiation.
Ginkgo biloba L
Conclusions: This study demonstrated that G. biloba, through its free radical scavenging and antioxidant properties, successfully attenuated 99mTc-sestamibi radiation–induced oxidative organ injury. The latter is a crucial factor of cataractogenesis in rats, suggesting that G. biloba may have a potential benefit in the protection against radiopharmaceuticals.
radioprotective effects of Ginkgo biloba via its antioxidant Action
In relation to modern therapeutics, the extract termed “EGb 761”, present in many other recently commercialized products, is a well-defined preparation of the leaves of Ginkgo biloba that is generally used to treat brain disorders including dementias, neurosensory problems and peripheral circulatory disturbances. This paper discusses the radioprotective effects of EGb 761, with an introduction about free radicals and their role in the radiation–induced oxidative damage.
THE radioprotective effect OF flavonoids FROM GINKGO BILOBA LEAVES
Three water extracts of GBF were prepared (lowdosage 10 mg/100 ml, medium dosage 20 mg/100 ml and high dosage 100 mg/100 ml) and orally administered to mice . After 10 d, the mice were exposed to 8.5Gy -rays. After another 10 d of oral administration, the survival rates were recorded in 30 d. In another experiment, six groups of mice (three GBF groups, radiation control, normal control and cyclophosphamide group) were arranged. The first three groups were orally administered with low, medium and high dosage of GBF respectively for 11d; the other three groups with distilled water. Then the three GBF groups and radiation group were exposed to 1.0Gy -rays. Then they were orally administered again in the following 7d .
Micronucleated polychromatic erythrocytes in bone-marrow and sperms (AFS) in mice were observed on the 21st day after termination of oral administration. Proliferation rates of lymphocyte (PRL) were determined in the three GBF groups and normal control.
GPC (grape procyanidins)
The aim of this study was to investigate the synergistic antioxidant potential and protective effect of grape seed procyanidins (GSP) in combination with Auricularia auricular-judae polysaccharides (AAP IV) on radiation injury in splenocytes. Rat splenocyte irradiation resulted in significantly higher apoptosis rate, malondialdehyde (MDA) (p < 0.005), reactive oxygen species (ROS) (p < 0.01); cell viability, total superoxide dismutase (T-SOD) (p < 0.01), catalase (CAT) (p < 0.01), glutathione peroxidase (GSH-PX) (p < 0.05), activity and glutathione (GSH) (p < 0.01) levels were significantly reduced, compared with the control group. “GSP + AAP IV” treatment of rat splenocytes at doses of “GSP (0.3 μg/mL) + AAP IV (50 μg/mL)” displayed higher radioprotective and antioxidative effects than the administration of either GSP or AAP IV, as evident by lower levels of MDA (p < 0.001) concentration, as well as higher cell viability and T-SOD (p < 0.05), CAT (p < 0.005), GSH-PX (p < 0.01) and GSH content compared to the radiation group. In addition, in vivo studies have shown that “GSP + AAP IV” significantly ameliorated the decrease of spleen index (p < 0.005) and spleen GSH (p < 0.005) levels and significantly inhibited the increase of MDA (p < 0.005) levels of spleen with radiation–induced damage, compared with the non-treated group.
study on protective effect of grape procyanidins in radiation injury in radiation-contacted persons
Conclusion: GPC should have protective effects on radiation injury of the radiation-contacted persons.
protective effect of grape procyanidins on oxidiation injury in people exposed to nuclear radiation
Conclusion: GPC can to some extent protect people exposed to nuclear radiation from oxidiation injury.
Grewia asiatica
The radioprotective effect of Grewia asiatica fruit (GAE) which contains anthocyanin-type cyanidin 3-glucoside, vitamins C and A, minerals, carotenes and dietary fibre was studied. For the study Swiss albino mice were divided into five groups: (1) control (vehicle treated); (2) GAE treated (700 mg kg−1 day−1 for 15 days); (3) irradiated (5 Gy); (4) GAE+irradiated and (5) irradiated+GAE treated. The irradiation of animals resulted in a significant elevation of lipid peroxidation in terms of thiobarbituric acid reactive substances (TBARS) content and depletion in glutathione (GSH) and protein levels at all intervals studied, namely 1–30 days, in comparison to the control group.
radioprotective role of Grewia asiatica in mice blood
The aim of the present study was to evaluate the radioprotective effect of Grewia asiatica fruit pulp extract (GAE) on Swiss albino mice against radiation induced hematological and biochemical alterations. Swiss albino mice (6–8 weeks) were divided into four groups. Group I (normal) without any treatment. Group II (Drug) was orally supplemented (GAE) once daily at the dose of 700 mg / kg. b.wt / day for 15 days. Group III (control) only irradiated group. GroupIV (Drug+IR) was administered same as group II, then exposed to 5Gy of gamma radiation.
The radioprotective efficacy of methanolic extract of Grewia asiatica (Phalsa) fruit (GAE) against whole body gamma radiation was studied in Swiss albino mice. After drug toxicity test, the oral administration of 700 mg//kg body weight /day of GAE for 15 consecutive days before exposure to 10 Gy of ? radiation was found to afford maximum protection as evidenced by the highest number of survivors after 30 days post irradiation. At this dose level GAE was found to be effective against different levels of radiation doses. LD50/30 value of 6.21 for irradiation alone (control) and 9.53 for Grewia asiatica + irradiation group (experimental) was obtained; a dose reduction factor (DRF) 1.53 was calculated.
The mice of experimental group exhibited significant modulation of radiation– induced decreases of reduced glutathione (GSH) and radiation– induced increase in lipid peroxidation (LPO) in the whole brain and liver at 24 hours after radiation exposure.
Hemidesmus indicus
radiation protection of DNA and membrane in vitro by extract of Hemidesmus indicus
radioprotective effect of H. indicus root extract on lipid peroxidation in rat liver microsomes and plasmid DNA was examined. Hemidesmus indicus (HI) root extract was found to protect microsomal membranes as evident from reduction in lipid peroxidation values. The extract could also protect DNA from radiation induced strand breaks.
Hippophae rhamnoides
radioprotective and antioxidant activity of Fractionated extracts of Berries of Hippophae rhamnoides
plants are an abundant source of medicinal compounds, some of which are useful in combating free radical-mediated oxidative stress. In the present study, initially two fractions designated REC-1001 (flavonoid-rich fraction) and REC-1002 (flavonoid-poor fraction) of Hippophae rhamnoides were screened on the basis of their reducing power in the aqueous phase. REC-1001 was selected for further study, since it exhibited 27.38 times higher antioxidant activity than REC-1002. REC-1001 also showed significant (P < .05) membrane protection potential at 50 μg/mL, which was attributed to its ability to scavenge peroxyl radicals (64.82 ± 1.25% scavenging within 1,440 min).
A significant (P < .05) difference of 67.02% in free radical scavenging activity at 1,000 ng/mL between REC-1001 and vitamin E demonstrated the extract fraction’s worth in radiation protection. Such activities were attributed to the presence of quercetin, isorhamnetin, and kaempferol in this fraction. Further, REC-1001 was found to be nontoxic up to 200 mg/kg of body weight. This research suggests that the REC-1001 fraction of H. rhamnoides extract is a safe and effective antioxidant nutraceutical product.
Whole-Body radioprotective effects of SBL-1: A Preparation From Leaves of Hippophae rhamnoides
The radioprotective effects of Hippophae rhamnoides (common name, sea buckthorn) leaf extract, designated SBL-1, were investigated in Swiss Albino strain ‘A’ mice. Against 100% mortality in whole-body irradiated (60Co-gamma-rays, 10 Gy) controls, a single dose of the SBL-1 rendered >90% survivors when administered 30 min before irradiation and 90% to 80% survivors when administered 1 to 4 h before irradiation. SBL-1 activated proliferation of hemopoietic stem cells countered a radiation–induced decrease in total thiols and an increase in free radicals in plasma and liver; inhibited lipid peroxidation, and normalized the liver alkaline phosphatase activity.
This study demonstrated high radioprotective potential of H. rhamnoides leaves.
Houttuynia cordata
Conclusion: The main active components of Houttuynia cordata Thunb. have a potential pharmacological effect against RILI via the cancer pathways, TNF signaling pathway, and PI3K-Akt signaling pathway.
Conclusion: H. cordata extracts and its bioactive molecules were shown to have both anti-inflammatory and anti-oxidative properties. As both in vitro and in vivo studies were shown that H. cordata did not have any toxicity on the various model systems used, future clinical studies will hopefully make an impact on the future direction of treating inflammation-related diseases.
IH636 grape seed proanthocyanidin
Conclusion: The study failed to show efficacy of orally-adminstered GSPE in patients with breast induration following radiotherapy for breast cancer.
Ishige okamurae
The aim of this study was to evaluate the radioprotective effects of diphlorethohydroxycarmalol (DPHC), isolated from the brown algae Ishige okamurae, in mice subjected to gamma irradiation. DPHC significantly decreased the level of radiation–induced intracellular reactive oxygen species in cultured Chinese hamster lung fibroblast (V79-4) cells (p < 0.05), enhanced cell viability that decreased after exposure to γ-rays, and reduced radiation–induced apoptosis in the V79-4 cells.
pretreatment with DPHC (100 mg/kg) in mice prior to irradiation significantly protected the intestinal crypt cells in the jejunum (p < 0.01) and maintained villi height (p < 0.01), compared with those of the vehicle-treated irradiated group. Mice pretreated with DPHC also exhibited dose-dependent increases in the bone marrow cell viability. The dose-reduction factor for gamma irradiation in the DPHC-pretreated mice was 2.05 at 3.5 days after irradiation.
In this study, the effects of a polysaccharide purified from the celluclast extract of Lactobacillus plantarum-fermented Ishige okamurae (CPFI) against gamma ray-irradiation–induced oxidative stress were investigated in a zebrafish model. CPFI showed an increased extraction yield and high 1,1-diphenyl-2-picrylhydrazyl and hydroxyl radical-scavenging activities. It was further purified using anion-exchange chromatography, and among the six fractions obtained, fraction 2 (AP2), with high glucose and mannose contents, exhibited the highest free radical scavenging activity. AP2 improved zebrafish survival and reduced malformations, such as yolk sac oedema and the occurrence of a bent tail. It also reduced cell death and the production of reactive oxygen species and nitric oxide in the zebrafish. Taken together, these results indicate that the AP2 polysaccharide has radioprotective and antioxidant effects, and is a value-added source of functional food ingredients.
Juglans regia
Conclusion: The present findings suggest that MEJR exhibit photo protective effects and hence it may be useful for the treatment of inflammation related responses. The pharmacological mechanism of MEJR partly associated with its uv absorbance, modulation of inflammatory signaling as well as due to its free radical scavenging capability.
Fresh walnut seeds are vulnerable to germination during room-temperature storage, which can be delayed or inhibited by gamma radiation. However, the inhibitory mechanism involves the expression of multiple genes and remains unclear. ‘Liaohe 2’ fresh walnut seeds were exposed to a wide-spectrum dose of 60Co gamma rays and then stored in sand under a suitable humidity at 25 ± 1 °C. Six transcriptome libraries of walnut embryos irradiated at 0 and 50 Gy were investigated at 0, 6 and 12 d of storage using RNA-seq. The results showed that a total of 177 differentially expressed genes (DEGs) was detected between the GR0d vs CK0d seeds. With gamma radiation, 471 genes were upregulated and 2835 genes could not be upregulated during the germination of untreated walnuts. Additionally, 1212 genes could not be downregulated, and 166 genes were downregulated. Glutathione and non-homologous end-joining were upregulated immediately after gamma radiation.
Korean Red Ginseng
radiation–induced oral mucositis is a dose-limiting toxic side effect for patients with head and neck cancer. Numerous attempts at improving radiation–induced oral mucositis have not produced a qualified treatment. Ginseng polysaccharide has multiple immuno-protective effects. Our aim was to investigate the effectiveness of Korean red ginseng (KRG) on radiation–induced damage in the human keratinocyte cell line HaCaT and in an in vivo zebrafish model. radiation inhibited HaCaT cell proliferation and migration in a cell viability assay and wound healing assay, respectively. KRG protected against these effects. KRG attenuated the radiation–induced embryotoxicity in the zebrafish model.
Conclusion: Taken together, our data suggest that RGSF can be considered and developed for use as an effective radioprotective agent with minimal adverse effects.
effect of Korean Red Ginseng on radiation–induced bone loss in C3H/HeN mice
This study investigated the effects of Korean Red Ginseng (KRG) on radiation–induced bone loss in C3H/HeN mice. C3H/HeN mice were divided into sham and irradiation (3 Gy, gamma-ray) groups. The irradiated mice were treated for 12 wk with vehicle, KRG (per os, p.o.) or KRG (intraperitoneal). Serum alkaline phosphatase (ALP), tartrate-resistant acid phosphatase, estradiol level, and biomechanical properties were measured. Tibiae were analyzed using micro-computed tomography. treatment of KRG (p.o., 250 mg/kg of body weight/d) significantly preserved trabecular bone volume, trabecular number, structure model index, and bone mineral density of proximal tibia metaphysic, but did not alter the uterus weight of the mice. Serum ALP level was slightly reduced by KRG treatment. However, grip strength, mechanical property, and cortical bone architecture did not differ among the experimental groups.
The results indicate that KRG can prevent radiation–induced bone loss in mice.
L-Cysteine
The results indicated a concentration-dependent radioprotection effect of NAC on the plastic properties of the cortical bones. The concentration dependency of NAC was in turn related to radiation dose levels. In conclusion, treatment of bone specimens with a characteristic concentration of NAC during exposure to specific radiation dose levels can provide an efficient radioprotection window for preserving the mechanical stability of gamma sterilized allografts.
Those methods were used to determine the presence of radiation–induced chromosome aberrations, such as dicentric and ring chromosomes. The results of that study showed significant reduction of the examined chromosome aberrations number in the following order: trymethylglicine – N-acetyl-L-cysteine – combined action. Reducing of their number directly correlated with the radioprotective ability of the amino acids to decrease the risk of serious radiation damage.
Confocal microscopy showed that radiation caused redistribution of occludin, zona occludens-1, claudin-3, E-cadherin, and β-catenin, as well as the actin cytoskeleton as early as 2 h postirradiation, and this effect was sustained for at least 24 h. Feeding NAC before irradiation blocked radiation–induced disruption of TJ, AJ, and the actin cytoskeleton. radiation increased mucosal permeability to inulin in colon, which was blocked by NAC feeding. The level of reduced-protein thiols in colon was depleted by radiation with a concomitant increase in the level of oxidized-protein thiol. NAC feeding blocked the radiation–induced protein thiol oxidation. These data demonstrate that radiation rapidly disrupts TJ, AJ, and the actin cytoskeleton by an oxidative stress-dependent mechanism that can be prevented by NAC feeding.
Laminaria japonica extract
effect of Laminaria japonica polysaccharides on radioprotection and splenic lymphocyte apoptosis
To investigate radioprotective effect of laminaria japonica polysaccharides (LJP) and its possible mechanism. The Wistar rats were randomly divided into 6 groups, the normal group, the model group and four LJP treatment groups(100, 200, 300 and 400 mg.kg～(-1).d～(-1)). LJP of four different doses was applied to different group respectively for 10 d before whole-body irradiation with #gamma#-ray(9.0 Cy). The indexes of humoral immune, cellular immune, nonspecific immune functions and apoptosis ratio of splenic lymphocyte were measured 18 h later.
The related immune indexes of the positive control group were obviously lower than those of the normal group. The apoptosis ratio of splenic lymphocyte in the positive control group was higher than that in other groups. LJP signfficantly modulated immune function in irradiated rat and there was a dose-effect relationship in a certain range of dosage. The radio-protective action of LJP is due, at least in part, to its arrestment of lymphocyte apoptosis.
potential applications of radioprotective phytochemicals from marine algae
The use of ionizing radiation and radioactive elements is becoming increasingly popular with the rapid developments in nuclear technology, radiotherapy, and radio diagnostic methods. However, ionizing radiation can directly or indirectly cause life-threatening complications such as cancer, radiation burns, and impaired immunity. Environmental contamination with radioactive elements and the depletion of ozone layer also contribute to the increased levels of radiation exposure. radioprotective natural products have particularly received attention for their potential usefulness in counteracting radiation–induced damage because of their reduced toxicity compared with most drugs currently in use. Moreover, radioprotective substances are used as ingredients in cosmetic formulations in order to provide protection against ultraviolet radiation.
Over the past few decades, the exploration of marine algae has revealed the presence of radioprotective phytochemicals, such as phlorotannins, polysaccharides, carotenoids and other compounds. With their promising radioprotective effects, marine algae could be a future source for discovering potential radioprotective substances for development as useful in therapeutics.
effect of Laminaria japonica polysaccharides (LJP) on radiation damage of testis tissue in male rats
Objective: To observe the effect of laminaria japonica polysaccharides (LJP) on local radiation damage of testis tissue in male rats.
Methods: The Wistar rats were randomly divided into 4 groups: the normal group, the model group, positive control group and LJP treatment group (50 mg·kg-1·d-1). LJP was applied to the treatment group for 10 d before local irradiation with γ-ray (6.0 Gy). The morphological change of the testis, organ index of testis and epididymides, sperm count, motility rate, superoxide dismutase (SOD) activity and malonic aldehyde (MDA) contents were measured.
Results: LJP could make the damaged testis recover to near normal, elevate the organ index of testis and epididymides, promote the sperm count and motility rate, increase the activity of SOD and decrease the contents of MDA in testis tissue.
Conclusions: LJP could inhibit testis tissue damage induced by local radiation, hence enhance the significant radioprotective effect to testis tissue. LJP has the conspicuous protective effect on radiation damage of testis tissue.
Ligusticum chuanxiong Hort extract
The ethanolic extracts of some Chinese traditional herb drugs, reported by Hong-Fu Wang et al. in China, could inhibit platelet aggregation as well as protect against radiation damage in mice, rat and rabbits. The inhibitory effects of the extracts of five Chinese drugs on the rate of platelet aggregation were observed in both in vitro and in vivo tests, averaging 23–53% in vitro and 46–69% in vivo. Antiradiation tests on mice vs. 7.5–8.0 Gy of γ-radiation, using the herb drug extracts as protective agents, showed increasing survival rates by 8–50%. Based on Hong-Fu Wang’s report, a search for the active constituents of these herb drugs in inhibiting platelet aggregation and protecting animals against radiation damage was started. In this research program, a Chinese traditional drug, Rhizoma Chuanxiong (rhizome of Ligusticum chuanxiong Hort.) was chosen. Three types of chemicals present in Rhizoma Chuanxiong, appeared promising for testing: 1-(5-hydroxymethyl-2-furyl)-9H-pyrido-(3,4-b)indole, 4-hydroxyl-3-butylidenephthalide and 5-hydroxyl-3-butylidenephthalide, and 4-hydroxyl-3-methoxycinnamyl 4-hydroxyl-3-methoxycinnamate. A total of 56 compounds of these derivatives has been synthesized and 30 were synthesized for the first time.
Results: Twenty constituents in the essential oil were identified and they showed good antioxidant properties, in that IC50 value in DPPH and ABTS showed 6.79 and 7.33 μg/ml and 1.58 and 1.58 μg/ml in C. officinale and L. chuanxiong. Their treatment inhibited the migration of damaged DNA induced by uv-B; furthermore, they decreased p21 expression and increased cyclin D1 expression as apoptosis-regulatory genes.
Conclusions: These results suggest that essential oils in C. officinale and L. chuanxiong may exert inhibitory effects on DNA damage and apoptosis induced by UVB through their high free radical scavenging ability.
Linum usitatissimum
Prophylactic effect of flaxseed oil against radiation‐induced hepatotoxicity in mice
The lifespan was increased in the flaxseed oil treated irradiated mice in comparison with their respective control mice, with survival data showing an LD50/30 (lethal dose for 50% of animals after 30 days) of 7.1 and 10 Gy for control and FO treated irradiated mice, respectively, and produced a dose reduction factor for flaxseed oil (DRF) of 1.40. radiation–induced deficits in body and organ weight were significantly reduced or prevented in flaxseed oil pretreated mice. The protection afforded by flaxseed oil may be attributed to the constituents of the oil, which include omega-3 essential fatty acids and phytoestrogenic lignans, which appear to play an important role in free radical scavenging and singlet oxygen quenching.
The study does not rule out the possibility of a prophylactic potential of flaxseed oil against radiation–induced degenerative changes in liver.
The aim of this study is to determine antioxidant and antiapoptotic effects of flax seed oil (FSO) on rats exposed to ultraviolet C (uvC). Malondialdehyde (MDA), protein carbonyl (PC) and reduced glutathione (GSH) levels as well as glutathione peroxidase (GPx) and superoxide dismutase (SOD) activities were measured in lens, skin and serum. In addition, β-carotene, vitamin A, C and E contents were measured in serum, while apoptosis was determined in retina. Rats were divided into three groups as control, uvC and uvC + FSO. uvC and uvC + FSO groups were exposed to uvC light for 1 h twice a day for 4 weeks. FSO (4 ml/kg bw) was given by gavage before each irradiation period to the uv + FSO group. While MDA and PC levels of the uvC group increased compared to the control group, their levels decreased in the uvC + FSO group compared with the uvC group in skin, lens and serum.
protective effect of flax seed oil against radiation induced hematological alterations in mammals
The present study has been focused to find out the preventive action of flaxseed oil against radiation induced hematological and biochemical lesions in mammals. For this purpose, FSO (50μL/animal/day) was orally administered to Swiss albino mice for five days, prior to 6 Gy gamma radiation exposure. The animals were sacrificed on 1st, 3rd, 7th, 15th and 30th day after irradiation. radiation treated control group exhibited significant reduction in erythrocytes count, hemoglobin content, hematocrit value and total WBC count in peripheral blood. In contrast, pretreatment with FSO significantly increased all these blood constituents. Further, the antioxidant parameters such as reduced glutathione, catalase, and superoxide dismutase showed a significant elevation in FSO pretreated group which were reduced in irradiated control group. Similarly, radiation induced increase lipid peroxidation in blood was significantly inhibited after FSO treatment.
The present results indicate that the flaxseed oil has the ability to debilitate the radiation induced adverse alterations in the peripheral blood throughout the experiment in mammals.
Lonicera japonica
enhanced uv radiation can change plant biology, especially secondary metabolites, yet the effects on postharvest medicinal plant tissues are now rarely researched. Therefore, our study was aimed to explore changes of secondary metabolites and pharmacological activities involved in the response to enhanced uv-A and uv-B radiation induction in freshly collected flower buds of Lonicera japonica Thunb. We found that after uv-A and uv-B radiation, the content of seven compounds dramatically increased. We identified these compounds by HPLC–MS, which were four kinds of iridoid and three kinds of isochlorogenic acid. antioxidant experiment showed that the antioxidant power of methanol extracts from the flower buds represented enhancement to a certain extent after uv-A and uv-B radiation, compared to control group.
Featured by the shorter period required, the fewer experimental costs as well as the easier procedures to carry out, uv radiation would be a novel and feasible method to increase the health-related compounds of fresh postharvest medicinal plant tissues.
Postharvest ultraviolet-B (uv-B) radiation can modulate the accumulation of bioactive compounds with many pharmacological effects in plants. Honeysuckle (Lonicera japonica Thunb.) is a uv-B tolerant crop which has a high medical value. The effects of uv-B on bioactive compounds in its flowers have been reported, while very few studies focused on the leaves and stems. Therefore, the effects of postharvest uv-B radiation on basic physiological traits and bioactive compounds (polysaccharides and secondary metabolites) in the leaves, stems and flowers of honeysuckle were investigated in this study. In this study, the leaves, stems and flowers of honeysuckle were exposed to uv-B radiation (0, 8.4 and 22.4 μW cm−2) for different times (2, 4, 6 and 8 h), and variables were detected after 24 h after they were able to get a repair time. The results showed that the contents of chlorophyll, carotenoid, soluble sugar, and the activities of catalase (CAT) and superoxide dismutase (SOD) in postharvest leaves were increased after uv-B treatment. But the malonaldehyde (MDA) content in leaves decreased when the duration of uv-B treatment lasted for 4 h.
Lonicera japonica Thunb, also known as Jin Yin Hua and Japanese honeysuckle, is used as a herbal medicine in Asian countries. Its flowers have been used in folk medicine in the clinic and in making food or healthy beverages for over 1500 years in China. To investigate the molecular processes involved in L. japonica development from buds to flowers exposed to uv radiation, a comparative proteomics analysis was performed. Fifty-four proteins were identified as differentially expressed, including 42 that had increased expression and 12 that had decreased expression. The levels of the proteins related to glycolysis, TCA/organic acid transformation, major carbohydrate metabolism, oxidative pentose phosphate, stress, secondary metabolism, hormone, and mitochondrial electron transport were increased during flower opening process after exposure to uv radiation. Six metabolites in L. japonica buds and flowers were identified and relatively quantified using LC-MS/MS.
lutein
Conclusion: The present study suggests a protective role for lutein in palliating radiation–induced oxidative changes and maintaining the antioxidant system in vivo.
Lutein significantly inhibited MMP-1 expression, transcriptionally, and MMP-2 protein levels in dermal fibroblasts, without altering TIMPs expression. It significantly inhibited MMP-1 expression in melanoma cells while stimulating TIMP-2. Lutein did not alter fibroblast or melanoma cell viability or membrane integrity. In ultraviolet radiation exposed fibroblasts, lutein improved cell viability, membrane integrity and inhibited elastin expression, though more significantly in the UVB exposed fibroblasts.
In summary, the mechanism to lutein’s anti-aging and anti-carcinogenic effects include the inhibition of MMP to TIMP ratio in dermal fibroblasts and melanoma cells, and the inhibition of cell loss, membrane damage and elastin expression in ultraviolet radiation exposed fibroblasts.
Lycium ruthenicum Murr
protective effect of Lycium ruthenicum Murr. Against radiation Injury in Mice
The protective effect of Lycium ruthenicum Murr. against radiation injury was examined in mice. Kunming mice were randomly divided into a control group, model group, positive drug group and L. ruthenicum high dose (8 g/kg), L. ruthenicum middle dose (4 g/kg), L. ruthenicum low dose (2 g/kg) treatment groups, for which doses were administered the third day, seventh day and 14th day after irradiation. L. ruthenicum extract was administered orally to the mice in the three treatment groups and normal saline was administered orally to the mice in the control group and model group for 14 days. The positive group was treated with amifostine (WR-2721) at 30 min before irradiation.
The results showed that L. ruthenicum had protective effects against radiation injury in mice.
protective effects of Lycium ruthenicum murr on x-radiation injured mice
The protective effect of Lycium ruthenicum Murr. against radiation injury was examined in mice. Kunming mice were randomly divided into a control group, model group, positive drug group and L. ruthenicum high dose (8 g/kg), L. ruthenicum middle dose (4 g/kg), L. ruthenicum low dose (2 g/kg) treatment groups, for which doses were administered the third day, seventh day and 14th day after irradiation. L. ruthenicum extract was administered orally to the mice in the three treatment groups and normal saline was administered orally to the mice in the control group and model group for 14 days. The positive group was treated with amifostine (WR-2721) at 30 min before irradiation.
Lycopene
Radio-protectors are agents that protect human cells and tissues from undesirable effects of ionizing radiation by mainly scavenging radiation–induced free radicals. Although chemical radio-protectors diminish these deleterious side effects they induce a number of unwanted effects on humans such as blood pressure modifications, vomiting, nausea, and both local and generalized cutaneous reactions. These disadvantages have led to emphasis on the use of some botanical radio-protectants as alternatives. This review has collected and organized studies on a plant-derived radio-protector, lycopene. Lycopene protects normal tissues and cells by scavenging free radicals.
Therefore, treatment of cells with lycopene prior to exposure to an oxidative stress, oxidative molecules or ionizing radiation may be an effective approach in diminishing undesirable effects of radiation byproducts. Studies have designated lycopene to be an effective radio-protector with negligible side effects.
The present study aimed to evaluate the radioprotective effect of lycopene, a naturally occurring dietary carotenoid on γ-radiation–induced toxicity. The cellular changes were estimated by using lipid peroxidative indices like thiobarbituric acid reactive substances (TBARS), hydroperoxides (HP), the antioxidants superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and reduced glutathione (GSH). The DNA damage was analyzed by cytokinesis blocked micronucleus assay (CBMN), dicentric aberration (DC) and translocation frequency. The γ-radiation at different doses (1, 2 and 4 Gy) resulted in a significant increase in the number of micronuclei (MN), DC, translocation frequency, TBARS and HP level, whereas the levels of GSH and antioxidant enzymes were significantly decreased when compared with normal control.
Histopathological changes were associated with a significant increase in thiobarbituric acid reactive substances (TBARS) and alteration in xanthine oxidoreductase system (XOR). In parallel, significant decreases in reduced glutathione (GSH) content, superoxide dismutase (SOD) and catalase (CAT) activities were recorded. gamma irradiation has also induced a significant decrease in the level of monoamines: serotonin (5-HT), dopamine (DA), norepinephrine (NE), and epinephrine (EPI) associated with an increase in monoamine-oxidase (MAO) activity. Lycopene pretreatment has significantly improved the oxidant/antioxidant status, which was associated with significant regeneration of the small intestine, and improved monoamines levels.
Based on these results, it is concluded that lycopene may protect the small intestine against radiation–induced damage.
Mentha arvensis
Conclusion: From our study it is clear that mint extract provides protection against the radiation–induced sickness and mortality and the optimum protective dose of 10 mg/kg is safe from the point of drug-induced toxicity.
radioprotective potential of plants and herbs against the effects of ionizing radiation
This review mainly dwells on the radioprotective potential of plant and herbal extracts. The results obtained from in vitro and in vivo studies indicate that several botanicals such as Gingko biloba, Centella asiatica, Hippophae rhamnoides, Ocimum sanctum, Panax ginseng, Podophyllum hexandrum, Amaranthus paniculatus, Emblica officinalis, Phyllanthus amarus, Piper longum, Tinospora cordifoila, Mentha arvensis, Mentha piperita, Syzygium cumini, Zingiber officinale, Ageratum conyzoides, Aegle marmelos and Aphanamixis polystachya protect against radiation–induced lethality, lipid peroxidation and DNA damage.
The fractionation-guided evaluation may help to develop new radioprotectors of desired activities.
Mentha piperita
radioprotection of Swiss albino mice by plant extract Mentha piperita (Linn.)
The oral administration of Mentha extract (ME) before exposure to gamma radiation was found to be effective in increasing the frequency of radiation–induced endogenous spleen colonies. A significant increase in the weight of the spleen was observed in animals of the Mentha and radiation combined group in comparison to the irradiation-alone group on day 10 of postirradiation. Furthermore, a significant increase in the body weight of animals in the Mentha and radiation combined group was observed in all the radiation doses studied. A regression analysis of survival data yielded LD50/30 as 6.48 ± 0.07 and 11.59 ± 0.21 Gy for the irradiation-alone and the Mentha and radiation combined group, respectively, and produced a dose reduction factor (DRF) of 1.78. significant increases in total erythrocyte and leucocyte counts, hemoglobin concentration, and hematocrit values were observed in the animals of the Mentha and radiation combined group in comparison to the hematological values observed in the irradiation-alone group at all radiation doses studied (6, 8, and 10 Gy). A dose-dependent decrease in reduced glutathione (GSH) content and an increase in lipid peroxidation (LPO) levels were observed in control animals.
Moringa oleifera leaf
Protective effect of Moringa oleifera leaf extract (MoLE) against radiation–induced lipid peroxidation has been investigated. Swiss albino mice, selected from an inbred colony, were administered with MoLE (300 mg/kg body wt) for 15 days before exposing to a single dose of 5 Gy 60Co-gamma radiation. After treatments, animals were necropsied at different post irradiation intervals (days 1, 7 and 15) and hepatic lipid peroxidation and reduced glutathione (GSH) contents were estimated to observe the relative changes due to irradiation and its possible amelioration by MoLE. It was observed that, MoLE treatment restored GSH in liver and prevented radiation induced augmentation in hepatic lipid peroxidation.
Phytochemical analysis showed that MoLE possess various phytochemicals such as ascorbic acid, phenolics (catechin, epicatechin, ferulic acid, ellagic acid, myricetin) etc., which may play the key role in prevention of hepatic lipid peroxidation by scavenging radiation induced free radicals.
Leaf extract of Moringa oleifera Prevents Ionizing radiation–induced oxidative stress in Mice
The present study evaluated the hepatoprotective effect of aqueous ethanolic Moringa oleifera leaf extract (MoLE) against radiation–induced oxidative stress, which is assessed in terms of inflammation and lipid peroxidation. Swiss albino mice were administered MoLE (300 mg/kg of body weight) for 15 consecutive days before exposing them to a single dose of 5 Gy of 60Co γ-irradiation. Mice were sacrificed at 4 hours after irradiation. Liver was collected for immunoblotting and biochemical tests for the detection of markers of hepatic oxidative stress. nuclear translocation of nuclear factor kappa B (NF-κB) and lipid peroxidation were augmented, whereas the superoxide dismutase (SOD), catalase (CAT), reduced glutathione (GSH), and ferric reducing antioxidant power (FRAP) values were decreased by radiation exposure. Translocation of NF-κB from cytoplasm to nucleus and lipid peroxidation were found to be inhibited, whereas increases in SOD, CAT, GSH, and FRAP were observed in the mice treated with MoLE prior to irradiation.
This study aimed to evaluate the effects of methanolic extract of Moringa oleifera (MO) and/or low doses of gamma radiation (LDR) on amiodarone (AMD)-induced lung toxicity in rats. AMD administered to female albino rats (100 mg/kg body weight) for 10 consecutive days. Rats received methanolic extract of MO (250 mg/kg bwt) for 15 successive days and/or were exposed to whole body LDR (0.25Gy on the 1st and 10th days, up to a total dose of 0.5Gy). MO administration induced a significant decrease in serum tumor necrosis factor-alpha (TNF-α) and transforming growth factor-beta (TGF-β) levels as well as lactate dehydrogenase (LDH) activity. Also, the content of malondialdehyde (MDA) and hydroxyproline (HYP) was significantly decreased in lung tissue. Furthermore, MO significantly increased reduced glutathione (GSH) content in lung tissue as compared with AMD. The histopathological investigation of lung tissue revealed the appearance of interstitial pneumonia in rats treated with AMD.
N-Acetyl-L-cysteine
The goals of this study were to evaluate the effects of ionizing radiation on apical junctions in colonic epithelium and mucosal barrier function in mice in vivo. Adult mice were subjected to total body irradiation (4 Gy) with or without N-acetyl-l-cysteine (NAC) feeding for 5 days before irradiation. At 2–24 h postirradiation, the integrity of colonic epithelial tight junctions (TJ), adherens junctions (AJ), and the actin cytoskeleton was assessed by immunofluorescence microscopy and immunoblot analysis of detergent-insoluble fractions for TJ and AJ proteins. The barrier function was evaluated by measuring vascular-to-luminal flux of fluorescein isothiocyanate (FITC)-inulin in vivo and luminal-to-mucosal flux in vitro. oxidative stress was evaluated by measuring protein thiol oxidation.
The thiol N-acetyl-l-cysteine (NAC) is a source of cysteine for the synthesis of the endogenous antioxidant glutathione (GSH) which is depleted by ultraviolet radiation. It is also associated with the scavenging of reactive oxygen species (ROS). In this study the effects of NAC were examined in cultured human fibroblasts during prolonged exposure to ultraviolet B (UVB), ultraviolet A (uvA) and visible irradiation (280–700 nm), delivered by a 150 W xenon-arc lamp. The alkaline comet assay was used to assess the DNA damage in individual cells. It was found that incubating skin and lung fibroblasts at 37 °C for 1 h with an optimal 6 mM NAC supplement prior to light exposure, significantly reduced the level of DNA damage in both cell types, however, the skin fibroblasts were less sensitive to xenon-arc lamp irradiation than lung fibroblasts. NAC incubation resulted in an initial delay in DNA damage when the cells were irradiated. There was also a significant reduction in the overall levels of DNA damage observed with continued irradiation. NAC significantly reduced the DNA damage produced in lung fibroblasts depleted of normal GSH protection by the glutamylcysteinyl synthetase inhibitor, l-buthionine-[S,R]-sulfoximine.
Conclusion: Since many signaling molecules contain redox sensitive cysteine residues that regulate enzyme activity, we suggest that the effects of NAC on radiation–induced signal transduction are due to its ability to alter the intracellular reducing environment, and not related to direct scavenging of ROS.
Nelumbo nucifera
Procyanidins extracted with acetone–water from lotus (Nelumbo nucifera Gaertn.) seedpod (LSPCs) were evaluated for in vivo radioprotective activity against whole body gamma irradiation in Swiss albino mice. pretreated with LSPCs 200 mg/kg by intragastric (i.g.) for 15 days was found to be the most effective dose in preventing radiation sickness, reducing radiation–induced mortality, increasing mean survival time and elevating radiation median lethal dose (LD50) from 8.9 to 10.5 Gy, indicating a dose modifying factor (DMF) of 1.18.
The radioprotective effect of isoquercitrin-abundant fraction (IAF) of N. nucifera Gaertn. Ieaf extract against γ-irradiation–induced oxidative stress was evaluated by the lipid peroxidation-derived aldehydes (LPDAs) as a marker for oxidative risk in mice urine, and the DNA damage using comet assay in RAW 264.7 cells. Mice that were treated with IAF (50 mg/kg) and γ-irradiation showed considerably decreased LPDA levels relative to those that had received γ-irradiation alone.
Furthermore, pretreatment with IAF resulted in a significant decrease in the amount of DNA damage in cells. It is demonstrated that pretreatment with IAF of N. nucifera Gaertn. gives protection against irradiation–induced cellular damage
nicotinamide
Of all the analogs, it is nicotinamide itself which has been the most extensively studied as a radiosensitizer in vivo and the one that shows the greatest effect in animal tumours. It is also an agent that has been well established clinically for the treatment of a variety of disorders, with daily doses of up to 6 g being considered reasonably safe and associated with a low incidence of side effects. This human dose is equivalent to 100–200 mg/kg in mice and such doses will maximally sensitize murine tumours to radiation.
These findings have now resulted in phase I/II clinical trials of nicotinamide, in combination with carbogen breathing, as a potential radiosensitizing treatment.
Nicotinamide prevents ultraviolet radiation‐induced cellular energy loss
Uv radiation is carcinogenic by causing mutations in the skin and also by suppressing cutaneous antitumor immunity. We previously found nicotinamide (vitamin B3) to be highly effective at reducing uv–induced immunosuppression in human volunteers, with microarray studies on in vivo irradiated human skin suggesting that nicotinamide normalizes subsets of apoptosis, immune function and energy metabolism-related genes that are downregulated by uv exposure. Using human adult low calcium temperature keratinocytes, we further investigated nicotinamide’s effects on cellular energy metabolism. We found that nicotinamide prevented uv–induced cellular ATP loss and protected against uv–induced glycolytic blockade.
To determine whether nicotinamide alters the effects of uv–induced oxidative stress posttranslationally, we also measured uv–induced reactive oxygen species (ROS). Nicotinamide had no effect on ROS formation, and at the low uv doses used in these studies, equivalent to ambient daily sun exposure, there was no evidence of apoptosis. Hence, nicotinamide appears to exert its uv protective effects on the skin via its role in cellular energy pathways.
uv radiation–induced immunosuppression is greater in men and prevented by topical nicotinamide
uv radiation–induced immunosuppression augments cutaneous carcinogenesis. The incidence of skin cancer continues to increase despite increased use of sunscreens, which are less effective at preventing immunosuppression than sunburn. Using the Mantoux reaction as a model of skin immunity, we investigated the effects of solar-simulated (ss) uv and its component uvA and UVB wavebands and tested the ability of topical nicotinamide to protect from uv–induced immunosuppression. Healthy, Mantoux-positive volunteers were uv–irradiated on their backs, with 5% nicotinamide or vehicle applied to different sites in a randomized, double-blinded manner. Subsequent Mantoux testing at irradiated and adjacent unirradiated sites enabled measurement of uv–induced immunosuppression with and without nicotinamide.
Nigella sativa L.
Radiotherapy is one of the most common therapies for treating human cancers. Several studies have indicated that irradiation induces reactive oxygen species (ROS), which play an important role in radiation damage of the cell. It has been shown that Nigella saliva L. (NS) and reduced glutathione (GSH) have both an antiperoxidative effect on different tissues and a scavenger effect on ROS. The purpose of this study was to determine the antioxidant and radio-protective roles of NS and GSH against irradiation–induced oxidative injury in an experimental model. The NS group was administrated NS (1 mL/kg body weight), the GSH group was injected GSH (150 mg/kg body weight) and the control group was given physiologic saline solution (1 mL/kg body weight) for 30 consecutive days before exposure to a single dose of 6 Gy of radiation.
protection against radiation–induced oxidative damage by an ethanolic extract of Nigella sativa L.
Conclusion: The results obtained from the different experimental systems suggest the radioprotective ability of EE-NS involving prevention of radiation–induced oxidative damage.
effect of gamma radiation on microbiological and oil properties of black cumin (Nigella sativa L.)
Black cumin samples obtained from the market have been irradiated under 2.5 kGy, 6 kGy, 8 kGy, and 10 kGy doses, respectively. Along with the increase in the dose of irradiation, both the free fatty acid and peroxide values of the samples increased, whereas oil contents, iodine numbers, refraction index and Rancimat values decreased. In the composition of fatty acids, while the percentages of unsaturated fatty acids decreased; trans fatty acid levels increased. Microbial count of the samples decreased as the dose of irradiation increased. It has been observed that total bacterial count as well as total count of yeast and mould reduced to the undetectable limit.
Conclusion: N. sativa extract significantly decreases the severity of ARD and delays the onset of moist desquamation in breast cancer patients.
Ocimum sanctum
Ocimum sanctum (tulasi), an Indian herb, well known for its medicinal properties, has been shown to have significant radioprotective, tumor preventive and antioxidant effects in animal models. The present paper reviews the recent literature on these aspects of this plant.
radioprotective effect of leaf extract of Indian medicinal plant Ocimum sanctum.
Water or aqueous ethanol extract of O. sanctum was given ip, either as a single dose or multiple doses, before a whole-body exposure to 11 Gy(LD100/30) of 60Co gamma radiation in albino mice. The water extract was more effective and less toxic than the aqueous ethanol extract. An optimum ip dose of 50 mg/kg (< 1/100 LD50) of the water extract, at 10 mg/kg/day for 5 consecutive days, gave the maximum survival. Increasing the dose per treatment or the number of treatments did not increase protection. Intraperitoneal administration gave the best protection (70% survival).
Other routes (im, iv and po) were less effective and produced 37-47% survival. The optimum dose (ip) gave a dose modifying factor of 1.28. Since the extract may contain a number of chemical compounds, it is not possible to attribute the observed protection to any particular compound at present.
olive leaf
Based on histological evaluation, they prevented increases in the expression of Ki-67 and CD31-positive cells induced by the irradiation. These results suggest that the preventative effects of the olive leaf extract and oleuropein on chronic UVB–induced skin damage and carcinogenesis and tumor growth may be due to inhibition of the expression of VEGF, MMP-2, MMP-9, and MMP-13 through a reduction in COX-2 levels.
Conclusion: The present work showed that olive leaf extract or bone marrow mesenchymal stem cells (BMSCs) have lung tissue radiotherapeutic effects against whole body gamma radiation in male albino rats.
Conclusion: These results provide evidence that both olive leaf extract and stem cell therapy have radio-protective effect as they reduced the pathological cellular injuries in the liver induced by accumulated doses of radiation exposure. Further studies may be done to confirm these findings.
Leaf hairs of olive (Olea europaea) prevent stomatal closure by ultraviolet-B radiation
Photosynthetic capacity of dehaired leaves, measured at 5% CO2, however, was not influenced by ultraviolet-B radiation. We suggest, therefore, that ultraviolet-B radiation reduces photosynthetic rates by closing the stomata, while the observed reduction in photosystem II photochemical efficiency may concern only a superficial chloroplast population, contributing negligibly to whole leaf photosynthesis. Under the conditions of our experi- ments, the protective function of the indumentum against ultraviolet-B radiation predominates over the water conservation function.
Ophiopogon japonicus
Ophiopogon japonicus inhibits radiation–induced pulmonary inflammation in mice
Conclusion: As radiation–induced lung injury is a major obstacle in thoracic radiotherapies and seriously affect the quality of patients’ life. Application of O. japonicus may be a novel strategy to manage radiation–induced pulmonary inflammation.
Erratum to ophiopogon japonicus inhibits radiation–induced pulmonary inflammation in mice
In the article (1) “Ophiopogon japonicus inhibits radiation–induced pulmonary inflammation in mice” (Ann Transl Med 2019;7:622. doi: 10.21037/atm.2019.11.01), there is an error in Figure 1, e.g., the HE staining pictures of control group (Figure 1A,1B) was mistakenly placed using the same pictures of combination treatment group.
Conclusion: OP-C significantly ameliorates radiation–induced pulmonary fibrosis and may be a promising therapeutic strategy for this disorder.
Opuntia ficus indica
Conclusion: Thus, these findings illustrate that opuntiol prevents uvA–radiation-mediated oxidative stress-related biochemical changes in the cellular system.
Irrigation and fertilization management of experimental site increased the rate of soil organic matter mineralized in all N treatments, variable that may partially explain the responses obtained during the second year. These results may help to optimize N fertilization in cactus pear and to improve models that simulate the effects of N on cladodes, fruits and total aerial dry mater accumulation as well as on RUE.
Paeonia lactiflora
uvA induced oxidative stress was inhibited by paeoniflorin/Nrf2 signaling or PLIN2
Over expression of PLIN2 improved MTS activity and reduced MDA level in HDFs. The combination of PLIN2 overexpression and PF pre-treatment corporately inhibited uvA-induced injury. Besides, we also found that PF and PLIN2 had a compensatory protection against uvA induced oxidative stress. In conclusion, our study demonstrated that uvA induced photo damages could be inhibited by PF via Nrf2/HO-1/NQ-O1 signaling pathway or by PLIN2, and the combination of PLIN2 overexpression and PF played additive effects against uvA-related oxidative stress.
Panax ginseng
Normal food intake was improved in rats treated with 25 mg/kg KG. The anti-emetic effect of KG was further confirmed on the basis of serotonin release, histopathological findings. Our findings collectively indicate that KG protects against X-ray irradiation–induced acute pica to a moderate extent, leading to improved feeding behavior in rats.
Using this MN assay with human PBLs and mouse SLs, studies were performed to determine whether the water fraction of ginseng (Panax ginseng C.A.Meyer) against radiation–induced MN in human PBLs after in vitro irradiation (3Gy) and in SLs of C57BL/6 mice after in vivo irradiation (3Gy). The frequency of MN in human PBLs was reduced by water fraction of ginseng (0.5mg/ml of medium) both pre-and post treatment (p<0.0l) in vitro. In addition, the frequency of MN in mouse SLs was also reduced by pretreatment of ginseng (2mg/ml of drinking water for 7days) in vivo. The data suggested that the ginseng may reduce cell damage caused by -rays in vitro and in vivo. Further studies are needed to characterize better the protective nature of ginseng extract, its fractions and compounds.
radioprotective potential of ginseng
In addition, ginseng’s radioprotective potential may also be related to its immunomodulating capabilities. Ginseng is a natural product with worldwide distribution, and in addition to its antitumor properties, ginseng appears to be a promising radioprotector for therapeutic or preventive protocols capable of attenuating the deleterious effects of radiation on human normal tissue, especially for cancer patients undergoing radiotherapy.
Panax notoginseng
Conclusion: These results demonstrate that LPNS has significant antiosteoporotic activity, which may warrant further investigations concerning its therapeutic effects in treating radiation–induced osteoporosis.
Collectively, Beijing and Canada-cultivated AGs had the best radioprotection. Heilongjiang and Jilin-originated AGs had the similar pharmacological effects while USA, Shandong and Shaanxi-grown AGs had closer pharmacological effects. This biochemical measurements-based PCA and heatmap clustering of AGs from seven cultivation regions was nearly consistent with ginsencoside content- and the previous serum metabolome-based analyses. However, the pearson correlation analysis revealed that only Rb3 and Rd were significantly correlated with some of assayed biochemical parameters in irradiated mice pretreated with different cultivation regions of AG extracts.
radioprotective Properties of Panax ginseng: Proposition of a study Protocol
radiation protection has been a concern in healthcare for a while. radiation Therapy (RT) is a common approach in cancer patients, it is estimated that 80% of these patients will need RT at some point. Likewise, radiation protection is an issue that is related to healthcare professionals as well, since radiation–based diagnosis and therapy may involve manipulation of unsealed radioactive sources, resulting on a high exposure rate for these professionals. Awareness on occupational exposure is increasing with the augmentation of radiation related professions and scenarios.
Panaxotriol
Phytochemicals: potential therapeutic Modulators of radiation induced Signaling Pathways
Ionizing radiation results in extensive damage to biological systems. The massive amount of ionizing radiation from nuclear accidents, radiation therapy (RT), space exploration, and the nuclear battlefield leads to damage to biological systems. radiation injuries, such as inflammation, fibrosis, and atrophy, are characterized by genomic instability, apoptosis, necrosis, and oncogenic transformation, mediated by the activation or inhibition of specific signaling pathways. exposure of tumors or normal cells to different doses of ionizing radiation could lead to the generation of free radical species, which can release signal mediators and lead to harmful effects. Although previous FDA-approved agents effectively mitigate radiation-associated toxicities, their use is limited due to their high cellular toxicities. Preclinical and clinical findings reveal that phytochemicals derived from plants that exhibit potent antioxidant activities efficiently target several signaling pathways.
Persea americana
Pretreatment also resulted in the increase of animal survival with dose reduction factor of 1.28. Our findings for the first time demonstrated that P. americana offers significant protection to rats from whole body exposure to X-rays and helps in antagonising the radiation effects, thereby combating acute radiation induced damage in living systems.
Our results suggest that P. americana gel-formulation, which presented stability, ensuring its quality and the therapeutic effect, could be an interesting strategy for the treatment of the pain associated with sunburn; this effect could be attributed to its biological constituents, especially catechin, chlorogenic acid, and rutin.
Conclusions: Persea americana provides protection against ovariectomy, and gamma radiation-mediated hepatic inflammation not only through its antioxidant, anti-inflammatory, lipid-lowering effect but also by modulating the fibrogenic markers.
Phycocyanin
Conclusion: Phycocyanin could regulate the radiation–induced disorder in lung and gut microbiota of mice, and reduce the radiation–induced lung inflammation and fibrosis.
An in vitro analysis of the effects of photosynthetically active and ultraviolet radiations was executed to assess the photostability of biologically relevant pigments phycocyanin (PC), phycoerythrin (PE) and allophycocyanin (APC) isolated from Lyngbya sp. A09DM. ultraviolet (uv) irradiances significantly affected the integrity of PC, PE and APC; however, PAR showed least effect. uv radiation affected the bilin chromophores covalently attached to phycobiliproteins (PBPs). Almost complete elimination of the chromophore bands associated with α– and β-subunit of PE and APC occurred after 4 h of uv-B exposure. After 5 h of uv-B exposure, the content of PC, PE and APC decreased by 51.65%, 96.8% and 96.53%, respectively. Contrary to PAR and uv-A radiation, a severe decrease in fluorescence of all PBPs was observed under uv-B irradiation.
The fluorescence activity of extracted PBP was gradually inhibited immediately after 15–30 min of uv-B exposure. In comparison to the PC, the fluorescence properties of PE and APC were severely lost under uv-B radiation. Moreover, the present study indicates that uv-B radiation can damage the structural and functional integrity of phycobiliproteins leading to the loss of their ecological and biological functions
Phyllanthus amarus
protective effect of an extract of Phyllanthus amarus against radiation–induced damage in Mice
The radioprotective effect of an extract of the plant Phyllanthus amarus (P. amarus) was investigated in adult BALB/c mice. P. amarus extract (750 mg/kg b.wt and 250 mg/kg b.wt) was administered orally to mice for five days prior to whole body radiation (6 Gy) and for one month after radiation. The animals were sacrificed on days 3, 9, 12, and 30 after radiation. P. amarus significantly increased the total W.B.C count, bone marrow cellularity, and α-esterase activity as compared to untreated radiation-exposed animals. P. amarus treatment also increased the activity of various antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), glutathione peroxidase (GPX), and glutathione reductase (GR), both in blood and tissue, which were reduced by radiation treatment.
The genotoxic effects of radiation on mouse chromosomes were evaluated by assaying the micronuclei formation and chromosomal aberrations. P.amarus was found to protect the clastogenic effects of radiation as seen from decreased number of micronuclei. The administration of P.amarus was also found to decrease the percentage of chromosomal aberrations. Based on our present and previous reports it could be concluded that P.amarus extract has significant radioprotective activity.
The protective effect of Phyllanthus amarus L in the irradiated roots of onion was evaluated. The results were indicated that the Phyllanthus extract showed a radio modifier effect by reducing the frequency of aberrant cells in the meristematic cells exposed to gamma rays.
Pilea microphylla
The fraction when screened for in vivo radioprotection in Swiss albino mice showed 80% protection at a dose of 900 mg/kg and with a DRF of about 1.12. The fraction was also found to protect livers of irradiated mice from depletion of endogenous antioxidant enzymes like glutathione, GST, SOD, catalase and thiols. The fraction also protected the villi height, increased the number of crypt cells while offering general protection to the intestine from acute radiation effects. The fraction also protected the hematopoietic system as assessed by endogenous spleen colony assay, contributing to the overall radioprotective ability.
Phenolic compounds isolated from Pilea microphylla prevent radiation–induced cellular DNA damage
The compounds also significantly prevented the Fenton reagent-induced calf thymus DNA damage. Pre-treatment with compounds 1–3 and 6 in V79 cells attenuated radiation–induced formation of reactive oxygen species, lipid peroxidation, cytotoxicity and DNA damage, correlating the antioxidant activity of polyphenols with their radioprotective effects. Compounds 1, 3 and 6 significantly inhibited lipid peroxidation, presumably due to 3′,4′-catechol ortho-dihydroxy moiety in the B-ring, which has a strong affinity for phospholipid membranes. Oxidation of flavonoids, with catechol structure on B-ring, yields a fairly stable ortho-semiquinone radical by facilitating electron delocalization, which is involved in antioxidant mechanism. Hence, the flavonoid structure, number and location of hydroxyl groups together determine the antioxidant and radioprotection mechanism.
Among the concentrations tested (12.5, 25 and 50 μg/ml) for radioprotection, PM1 at 25 μg/ml exhibited maximum protection. Further, when compared with constituent polyphenols viz., rutin, quercetin and chlorogenic acid (concentrations equivalent to that present in PM1-25 μg/ml), a combination of polyphenols was found most effective in preventing γ-radiation–induced cytotoxicity and genotoxicity. To conclude, radioprotection is possibly a synergistic effect of the phytochemicals present in the herbal extract, rather than any single component.
Piper betel Leaf
radioprotective Property of the Ethanolic extract of Piper betel Leaf
The radioprotective activity of PE could be attributed to its hydroxyl and superoxide radicals scavenging property along with its lymphoproliferative activity. The radical scavenging capacity of PE was primarily due to its constituent phenolics, which were isolated and identified as chevibetol and allyl pyrocatechol.
antioxidant activity of Piper betel Leaf extract and Its Constituents
The superior anti-LPO and radioprotective activities of APC vis-à-vis those of CHV could not be explained by their respective Fe(II) chelation and •OH radical scavenging capacities. The better ability of APC to scavenge O2–• radicals and H2O2 might account for the results.
The results suggest that PBL extract has high antioxidant potential and relatively non-toxic and thus could be assertively used to mitigate radiotherapy inflicted normal tissues damage and also injuries caused by moderate doses of radiation during unplanned exposures.
podophyllotoxin
On the contrary, these cytokines raised significantly in 11 Gy TGR-exposed mice. Lung pneumonitis and fibrosis were found significantly countered in these mice. The observations revealed that G-003M could regulate immune system by curtailing radiation–induced oxidative and inflammatory stress, which has helped in minimizing radiation-inflicted pneumonitis and fibrosis.
Further analysis of immune cells revealed G-003M-mediated restoration of CD3 and CD19 receptor, which was found decreased to significant level following irradiation. Similarly, Gr-1, a marker of granulocytes, was also retained by G-003M administration prior to radiation. Modulatory potential of this formulation (G-003M) can be exploited as a safe and effective countermeasure against radiation–induced lymphohemopoietic injury.
Furthermore, G-003M treated animals showed improved anti-tumor response compared to FDA approved Amifostine. Taken together, our findings suggest that G-003M may be used as a potential countermeasure for radiation injuries as well as an adjuvant during anti-cancer therapy.
Altogether, these results suggest that G-003M ameliorates the deleterious effects of radiation exposure by minimising ROS and NO generation and effectively regulating inflammatory and cell death pathways. Mechanism of protection elucidated in the current study demonstrates that G-003M can be used as a safe and effective radio protective agent in radiotherapy for human application.
Podophyllum hexandrum
Antitumour and radioprotective action of Podophyllum hexandrum.
A significant antitumour effect of P. hexandrum, a herb thriving at Himalayas (2500-4000 m), was observed in strain ‘A’ mice carrying solid tumours developed by transplanting Ehrlich ascites tumour (EAT). Subtoxic well tolerated sequential doses of aqueous extract of P. hexandrum (a daily dose of 34.5 mg/kg b.w. for 15 days) enhanced tumour doubling time (TDT) from 1.94 +/- 0.26 days to 19.1 +/- 2.5 days.
However, no synergism was revealed between radiation and P. hexandrum, though both independently manifested antitumour effects. In normal mice, pre-irradiation administration of extract of P. hexandrum protected mice in a dose dependent manner (optimal dose being 34.5 mg/kg body.wt. rendering 72% survival for 30 days) against whole body lethal irradiation of 10 Gy. radioprotective properties of P. hexandrum were found to be comparable to synthetic radioprotectors like diltiazem etc.
radioprotective activities of Podophyllum hexandrum: current knowledge of the molecular mechanisms
Podophyllotoxin finds use as a precursor for the semi- synthetic topisomerase inhibitors in the treatment of leukemias, lung and testicular cancers, dermatological disorders like warts, rheumatoid arthritis, psoriasis and malaria. It also has numerous applications in modern medicine by virtue of its free radical scavenging capacity. An extract of P. hexandrum has been shown to provide approximately 80% whole-body radioprotection in mice.
radioprotective and antioxidant Properties of Low-Altitude Podophyllum hexandrum (LAPH)
We conclude that LAPH, with its easy accessibility, ease of cultivation, multifarious radioprotective properties, and role as a renewable source of bioactive constituents, along with its low associated toxicity (due to partial removal of podophyllotoxin), enhances its possible use for human clinical applications.
radioprotective mechanism of Podophyllum hexandrum during spermatogenesis
This study implies that RP-1 offers radioprotection at biochemical and cytogenetic level by protecting antioxidant enzymes, reducing LPO and increasing thiol content. (Mol cell Biochem 267: 167–176, 2004)
Cytotoxic and radioprotective effects of Podophyllum hexandrum
These results suggest that the ability of REC-2001 to act as a pro-oxidant in presence of metal ions and antioxidant in presence of free radicals might be responsible for cytotoxic and radioprotective properties.
This study implies that 3-O––d-galactoside present in AEE renders radioprotection by protectinglipids, proteins in renal and neural model system against supra-lethal (0.25 kGy) gamma radi-ation.
The data conclusively demonstrate that high stability, multi organ availability, longer retention and non-toxic behavior of G-002M might help in exhibiting strong protective potential against lethal radiation.
It can be concluded that p53 expression plays a major role in the REC-2006-mediated protection against acute irradiation in HepG2 cells. PFT treatment reduced the radioprotective efficacy of REC-2006 by inhibiting the expression of HSF1 and Hsp70 and thereby the expression of Bcl-2, by up-regulating the cell-cycle-regulatory proteins and therefore reducing the span of time for DNA repair and also by inducing Bax-mediated apoptosis. PFT did not, however, show any effect on p53 regulating protein (Mdm2) and pro-survival protein (Ras-GAP).
Significant induction of PCNA and GADD45 expression in HepG2 cells suggested that REC-2006 increased the percentage survival of HepG2 cells by increasing the span of time as well as efficacy for repair processes. In conclusion, REC-2006 modulated the expression of p53 and thereby promoted cell cycle arrest in the G1 phase, encouraging cell proliferation and DNA repair and thus providing significantly higher protection against acute γ-radiation in the HepG2 cell line.
More than 90% inhibition was observed against lipid peroxidation (evaluated by estimating levels of malondialdehyde). The significant antihemolytic potential of REC-2003 could be attributed to its ability to scavenge free radicals, reduce per oxidative stress on lipid membranes, and render protection to DNA (evaluated using plasmid relaxation assay). All these activities holistically contributed toward the radioprotective ability. REC-2003 (8 mg/kg BW; intraperitoneal (i.p.), −30 min) rendered > 80% total-body protection in Swiss Albino Strain ‘A’ mice [against lethal radiation (10 Gy)] in a 30-day survival assay. Phytochemical characterization of the constituents of REC-2003 revealed the presence of polyphenolics (flavonoids).
The site-specific and non-site-specific deoxyribose degradation assay exhibited a dose-dependant hydroxyl scavenging potential of AEE (0.05-500 μg/ml). The anti-lipid peroxidation ability of AEE against radiation (0.25 kGy)-induc
The aqueous-ethanolic extract (AEE) of high altitude Podophyllum hexandrum has earlier been reported to render a radioprotective effect against lethal gamma radiation in in vitro model. AEE has also been reported to possess metal chelating and DNA protecting properties. The present study was undertaken to isolate and characterize the bioactive principle present in AEE and investigate its role in radiation protection. A novel molecule was found to be present in AEE and was assigned as 3-O-β-ᴅ-galactoside of quercetin by acid hydrolysis, LC-MS, LC-APCI-MS/MS and ¹³C NMR spectra.
Various biological activities were investigated at in vitro level. The antioxidant potential of AEE in lipid and aqueous phase was determined against numerous stresses. AEE was found to be significantly (p < 0.05) protective, i.e., against Fe²⁺ and Cu²⁺-induced linoleic acid degradation, respectively.
Polygonatum odoratum
The results showed that POE contained 8 essential substances and exhibited a potent antioxidant without any cytotoxicity. It was found that POE significantly decreased the MDA level and activated cell viability, SOD, CAT, and GSH-Px activities. The results from this study indicate that POE is a potent antioxidant, which can be developed as a radioprotector for diagnostic procedures.
Polygonum aviculare
effects of Polygonum aviculare herbal extract on sperm parameters after EMF exposure in mouse
Electromagnetic fields with high energy same as ionizing radiation inserts their destructive effects via free radical production. Using antioxidants or herbal plants with antioxidants components could diminish hazardous effects of EMF. Polygonum aviculare has a high amount of phenolic and flavonoid and proved that has antioxidants effects. The aim of this study was to evaluate the effects of Polygonum aviculare herbal extract on sperm parameters after EMF exposure in mouse.
Twenty four male mice, 8 weeks divided to 4 groups (one control and three experimental groups). control group didn’t receive EMF exposure. EMF group mice received 3 mT EMF during 2 months, 4 h daily and 5 days weekly. Polygonum aviculare group received 50 mg kg(-1) herbal extract during 2 months and poly -EMF group received 3 mT EMF during 2 months, 4 h daily and 5 days weekly and 50 mg kg(-1) herbal extract during 2 months. After 2 months the mice sacrificed with cervical dislocation and sperm obtained from tail of epididymis and motility and morphology of them were analyzed.
Sperm analysis results showed that in group with Polygonum aviculare, morphology and motility of sperm developed (p < 0.05). Present results showed that EMF can reduce motility of sperm and treatment of Polygonum aviculare after EMF exposure developed sperm quality after EMF exposure.
In this study, Polygonum aviculare L. extract, which has superior antioxidative and cellular membrane protective activity, was loaded onto cell penetrating peptide (CPP) conjugated liposomes to enhance transdermal delivery. The physical characteristics of typical liposomes and CPP-conjugated liposomes containing P. aviculare extract were evaluated. The particle sizes of both liposomes were approximately 150 nm. Whereas the zeta potential of typical liposomes was −45 mV, that of CPP-conjugated liposomes was +42 mV. The loading efficiency of P. aviculare extract in both liposomes was calculated to be about 83%. Fluorescent-labeled liposomes were prepared to evaluate cellular uptake and skin permeation efficiency.
Using flow cytometry, we found that CPP-conjugated liposomes improved cellular uptake of the fluorescent dye as compared with the typical liposomes. In addition, the skin permeation of CPP-conjugated liposomes was proved higher than that of typical liposomes by confocal laser scanning microscopy studies and Franz diffusion cell experiments. The improved cellular uptake and skin permeation of the CPP-conjugated liposomes were due to the cationic arginine-rich peptide. In vivo studies also determined that the CPP-conjugated liposomes were more effective in depigmentation and anti-wrinkle studies than typical liposomes.
These results indicate that the CPP-conjugated liposomes could be effective for transdermal drug delivery of antioxidant and anti-aging therapeutics.
Polyporus umbellatus
Mechanistic study showed that administration of PUPs at a dose of 50 mg/kg 30 min before irradiation significantly reduced the formation of the oxidative DNA damage (8-hydroxy-2V-deoxyguanosine) and lipid peroxidation in irradiated mouse liver. The antioxidant activity of PUPs may contribute to its radioprotective effect. Furthermore, PUPs caused a dose-dependent inhibition of cyclophosphamide-induced MN formation in TK6 cells. PUPs also inhibited MN frequencies in cyclophosphamide-treated mice. Since PUPs are natural, relatively nontoxic and less-expensive; these data suggest that PUPs may be a useful radioprotective agent and chemopreventive agent.
This experiment attempts to relieve the depression of hemapoietic function and immune function induced in rats by a single 6 Gy ~(60)Co-ray whole body radiation with Polyporus umbellatus injected intraperitoneally into rats.
The results show that Polyprous umbellatus can increase the number of peripheral blood leucocytes in rats on the 3rd, 6 th, 10 th day after the radiation, the number of bone narrrow cells, NK cell activity and spleen index on the 10th day after the radia-tion.
The antioxidant activity of Polyporus umbellatus Polysaccharides may contribute to its radioprotective effect. Since PUPs are natural, relatively nontoxic and less-expensive; these data suggest that PUPs may be a useful radioprotective agent.
Polyporus umbellatus Polysaccharides caused a dose-dependent inhibition of cyclophosphamide-induced MN formation in TK6 cells. PUPs also inhibited MN frequencies in cyclophosphamide-treated mice. Since PUPs are natural, relatively nontoxic and less-expensive; these data suggest that PUPs may be a useful radioprotective agent and chemopreventive agent.
Pomegranate peel
Conclusion: The study concluded that pomegranate peel extract can ameliorate the histopathological changes induced by mobile phone electromagnetic radiations.
Rakhmawati M, Qadriyati I, Wijayanti L. 2011. The effect of red pomegranate (Punica granatum) peel extract on leukocyte number and type in rats exposed with mobile phone electromagnetic radiation. Biofarmasi 9: 55-61. This research aimed to examine the effect of red pomegranate (Punica granatum) peel extract on leukocyte number and type in rats exposed with mobile phone electromagnetic radiation. This study was a laboratory experimental post-test only control group design.
Enhancement of radiation–induced oxidative stress and cytotoxicity in tumor cells by ellagic acid
Conclusion: Combined treatment of tumor with EA and radiation enhances oxidative stress and cytotoxicity in tumor cells. EA protects normal cells against radiation damage. This may offer potential therapeutic benefit, which warrants clinical study for application in cancer radiotherapy.
protective effect of curcumin, ellagic acid and bixin on radiation induced genotoxicity.
These results indicated that antioxidant curcumin, ellagic acid and bixin provide protection against chromosome damage produced by radiation.
PPE supplementation reduced oxidative damage in the ileal tissues, probably by a mechanism that is associated with the decreased production of reactive oxygen metabolites and enhancement of antioxidant mechanisms. Adjuvant therapy of PPE may have a potential to support a successful radiotherapy by protecting against radiation–induced enteritis.
extract of Punica granatum inhibits skin photoaging induced by UVB irradiation
Conclusion The major polyphenols in PG, particularly catechin, play a significant role in its photoprotective effects on UVB–induced skin damage.
There has been an increase in the use of botanicals as skin photoprotective agents. Pomegranate (Punica granatum L.) is well known for its high concentration of polyphenolic compounds and for its antioxidant and anti-inflammatory properties. The aim of this study was to analyze the photoprotection provided by P. granatum seed oil nanoemulsion entrapping the polyphenol-rich ethyl acetate fraction against UVB–induced DNA damage in the keratinocyte HaCaT cell line. For this purpose, HaCaT cells were pretreated for 1 h with nanoemulsions in a serum-free medium and then irradiated with UVB (90–200 mJ/cm2) rays. Fluorescence microscopy analysis provided information about the cellular internalization of the nanodroplets. We also determined the in vitro SPF of the nanoemulsions and evaluated their phototoxicity using the 3T3 Neutral Red Uptake Phototoxicity Test. The nanoemulsions were able to protect the cells‘ DNA against UVB–induced damage in a concentration dependent manner. Nanodroplets were internalized by the cells but a higher proportion was detected along the cell membrane. The SPF obtained (~ 25) depended on the concentration of the ethyl acetate fraction and pomegranate seed oil in the nanoemulsion. The photo protective formulations were classified as non-phototoxic.
In conclusion, nanoemulsions entrapping the polyphenol-rich ethyl acetate fraction show potential for use as a sunscreen product.
Poria cocos
Reductive effects of poria cocos on radiation–induced damage
In order to screen a radioprotective material from nontoxic natural products, the effects of Poria cocos (PC), known as a blood tonic of traditional Oriental herbs, were investigated in HL-60 cells and ICR mice. The water extract of PC was administrated to mice and then the mice were irradiated with – rays. The jejunal crypt survival, endogenous spleen colony formation and apoptosis in jejunal crypt cells were investigated in mice irradiated with 12 Gy, 6.5 Gy, 2 Gy of -rays, respectively.
The administration of the PC extract protected the jejunal crypts (p<0.005) and decreased the apoptosis frequency (p<0.05). The formation of endogenous spleen colony was increased but not significantly. The micronuclei (MN) formation and the alkaline single-cell gel electrophoresis (SCGE; comet assay) were investigated in HL- 60 cells irradiated 2 Gy of -rays. The frequency of MN was decreased (p<0.001) and the tail movement, which was a marker of DNA strand breaks in the SCGE, was decreased in groups treated with PC extract (p<0.01) before exposure to-irradiation.
These results indicated that PC protects stem cells and reduces DNA damage induced by -rays. Therefore, Poria cocos might be a useful radioprotector, especially since it is a relatively nontoxic product.
We performed this study to determine the radioprotective effect of Sam Ryung Baek Chul San (San Ling Bai Shu San), as a prescription of traditional Oriental medicine, and its major ingredients. Jejunal crypt survival, endogenous spleen colony formation, and apoptosis in jejunal crypt cells were investigated in irradiated mice with high and low dose of rays. Sam Ryung Baek Chul San administration before irradiation increased the formation of endogenous spleen colony(p<0.05) and reduced the frequency of radiation induced apoptosis(p<0.05). In the experiment on the effect of ingredients of Sam Ryung Baek Chul San, the result indicated that the extracts of Panax ginseng, Poria cocos and Coix lacryma jabi might have the major radioprotective effects.
Although the mechanisms of these inhibitory effects remain to be elucidated, these results indicated that Sam Ryung Baek Chul San might be a useful radioprotector, especially since it is a relatively nontoxic natural product.
Porphyra haitanensis
study on the ability of shielding uleraviolet-ray from methand extract of Porphyra haitanensis
These compounds also had the ability to eliminate reactive oxygen species, 12.82% of DPPH and 0.58% of hydroxyl radical can be cleared up by these compounds. The data in our paper showed the compounds extracted from Porphyra haitanensis can be used for sun-screen cosmetic．
antitumor function and mechanism of phycoerythrin from Porphyra haitanensis
These results strongly suggest that the antitumor effect of R-PE from Porphyra haitanensis functioned by increasing the immunity and antioxidant ability of S180 tumor-bearing mice, promoting apoptosis by increasing protease gene expression and TNF-α secretion.
This study was designed to fully characterize Porphyra haitanensis polysaccharides, and to evaluate their antioxidant activity. The polysaccharides primarily contained galactose and 3,6-anhydrogalactose in a molar ratio of 1.2:1.0, respectively and sulfate content about 3.8%. The molecular weight of polysaccharides is 2.5 × 105 Da. Scanning electron microscopy and atomic force microscopy of the polysaccharides pointed towards an irregular network with more or less hexagonal and a few rectangular pores.
Potassium Iodide
Conclusion: The results of the current study indicate that compared with potassium iodide alone, combined thyroxine, methimazole, and potassium iodide protect the thyroid more effectively against radiation damage from 123/131I during diagnostic and therapeutic MIBG administration in children with neuroblastoma.
Conclusion: This study observes a general high inter- and intra-individual variability in radio-iodide uptake in the thyroid after I-131-MIBG therapy despite KI premedication, as well as possible occurrence of hypothyroidism. A dose-response relationship needs confirmation on a larger cohort of patients to reach statistical value. An alternative thyroid cytoprotection strategy for possible long-term survivors may be considered.
Use of potassium iodide to minimize thyroid radiation from radioactive fall-out
Nuclear power reactors have a large inventory of radionuclides generated from fission of uranium and plutonium. Radioiodines and other fission products are held within the metal cladding of the fuel rods. An accident destroying the integrity of this cladding and the containment will release these radionuclides into the atmosphere as gases, aerosols, or particulates. In these forms, their environmental dispersion is erratic and inhomogeneous, depending largely on meteorologic conditions.
Potassium iodide for radiation exposure
Conclusion: This proposed systematic review will update the existing WHO guideline from 1999. New evidence on the efficacy of KI administration to reduce thyroid cancer, hypothyroidism, and benign thyroid nodules in the event of an accidental release of radioactive iodine to the environment will provide the basis for an update of the WHO guideline for iodine prophylaxis following nuclear accidents.
Pothomorphe umbellata
In this study we evaluated the activity of Pothomorphe umbellata root extract on hairless mice chronically exposed to UVB radiation (76.5 mJ/cm2, 4 days per week for 22 weeks). Mouse dorsal surfaces were treated topically with 20 mg/cm2 of a carbomer 940 gel (vehicle) with or without P. umbellata root extract to a final concentration of 0.1%, for 2 h before irradiation. Another irradiated group received no topical treatment. A fourth group received no treatment and was not irradiated. Visible skin wrinkling was evaluated using a scale ranging from 0 to 4, where 0 corresponds to no skin modification, and 4 to the maximum visual skin alteration observed in our experiments. Histological measurements were carried out on standard haematoxylin & eosin stained sections. The mean distances between the outermost surface of the epidermis (excluding the stratum corneum) and the dermal–epidermal junction were determined by morphometric analysis.
In this study we assessed the protective effect of topical application of Pothomorphe umbellata extract on ultraviolet B (UVB)-induced skin lesion parameters in hairless mouse epidermis. A single dose of UVB irradiation (0.23 kJ/m2) resulted in a significant decrease in thymine dimer-positive cells and apoptotic sunburn cells, with an increase in p53 and proliferating cell nuclear antigen-positive cells in the epidermis. After 5 weeks (total dose 13.17 kJ/m2) and 15 weeks (total dose 55.51 kJ/m2) of irradiation, P. umbellata treatment inhibited the hyperplasic response and induced an increase in p53-positive cells.
These findings suggest that P. umbellata extract affords protection against UVB–induced skin lesions.
Pothomorphe umbellata extract Prevents α‐Tocopherol Depletion After uv‐irradiation
These data demonstrate that P. umbellata may be successfully used as a topical photoprotective agent.
These data demonstrate that P. umbellata may be successfully used as a topical skin–protecting agent against the deleterious effects of uv radiation.
Propolis
Metastases in the lung were generated by injecting viable