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• W3025056770 abstract "The aim of the study was to establish the radioprotective activity of citrus polymetoxylated flavonoids extract (CPMFE) on the X-irradiated rats. The experiments were carried out on white Wistar rats. Animals were irradiated with X rays in doses of 5 Gy and 7 Gy. The control group consisted the sham-irradiated rats. Part of animals of each group were treated with intramusculary injections of CPMFE (dose 30 mg/kg) during 7 days; blood was taken from the tail vein (0.5 ml) for detection of lipoperoxides (LOO.) content. On the 3rd day after irradiation 3 animals from each group were sacrificed (under ether anesthesia) and blood samples were taken for the study of antioxidant status. The activity of antioxidant enzymes (catalase (CAT) and superoxidedismutase (SOD)) was determined by the spectrophotometric method; the content of LOO.in the blood was determined by electron paramagnetic resonance (EPR) mrthod. In group of irradiated rats a sharp dose-dependent inactivation of blood antioxidant enzymes (SOD, CAT) and intensification of the lipid peroxidation were detected. The direct and feedback mechanism in the regulation of CAT and SOD activity, ensuring the implementation of antioxidant protection in the body was revealed. Under irradiation with 7Gy rapid death of animals (on 3-d day after irradiation the mortality of animals was 70%, and on the 5th day all died) were detected. During irradiation with dose 5 Gy the survival of animals increased (on the 8-th day after irradiation - 50% survival rate). CPMFE in dose-dependent manner supported the reduce the intensity of lipid peroxidation processes - at relatively low doses of radiation (5Gy) during the first 3 days the content of LOO.in the blood decreased insignificantly compared with indices in untreated animals, whereas with an increase in the dose of irradiation (7Gy) a statistically significant antiradical effect of CPMFE (a statistically significant decrease in the LOO. content) was detected. Under the effect of CPMFE in the blood of rats irradiated with a dose of 5 Gy and 7 Gy, the activity of CAT and SOD, not statistically significant tends to increase (more significant with a dose of 7 Gy). CPMFE did not affect the cumulative survival of animals irradiated with a dose of 5 Gy, but reduced the mortality of rats by 20% (on the 3rd day of irradiation), and contributed to an increase in the life expectancy of animals by 2 times (up to 7 days) in the case of dose 7 Gr. Based on the analysis of the research results, it can be assumed that under conditions of radiation damage, exogenous antioxidants synergistically with a dose-dependently activated endogenous non-enzymatic antioxidant system of the body (especially at 7Gy) contribute to the effective suppression of chain reactions of peroxidation, reduction of mortality and increase in life expectancy of animals." @default.
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• W3025056770 date "2018-12-01" @default.
• W3025056770 modified "2023-09-27" @default.
• W3025056770 title "[RADIOPROTECTIVE ACTIVITY OF POLYMETOXY-LATED FLAVONOIDS OF CITRUS EXTRACT]." @default.
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