Document Type : Original Research
Authors
1 Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
2 Department of Medical Physics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
3 Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Abstract
Background: Melatonin is a free radical scavenger. It has also antioxidant effects through its stimulatory actions on antioxidant system. Objective: We conducted this study to examine the effect of different oral doses of melatonin on liver tissue. Methods: We used 42 rats—6 rats in each group. Group I served as the control group; group II rats were pretreated with only melatonin; group III was exposed to radiation only; and groups IV to VII were pretreated with different doses of melatonin (10, 100, 200, 400 μg/kg, respectively) and exposed to 6 Gy whole body gamma irradiation. Results: Whole body irradiation induced liver tissue damage by increasing malondialdehyde (MDA) concentrations and decreasing glutathione (GSH) levels. Hepatic MDA levels in irradiated rats that were pretreated with oral administration of melatonin in Groups V, VI and VII, were significantly decreased, while the GSH levels were significantly increased.Conclusion: Oral administration of melatonin may prevent radiation-induced liver damage. This radio-protective effect is dose-dependent.
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