Present study was planned to determine possible dose-dependent effects of lithium (Li) on oxidant-antioxidant status and histomorphological changes in liver and kidney tissues. For this purpose, twenty-four Wistar male rats were equally divided into three groups: the rats in group I served as controls, drinking tap water without lithium. Groups II and III received 0.1 and 0.2 % lithium carbonate (Li2CO3) through their drinking water, respectively, for 30 days. At the end of the experimental period, lithium concentrations, levels of malondialdehyde (MDA) and glutathione (GSH) and superoxide dismutase (SOD) activities were measured in considered tissues. Histomorphological study was also performed on liver and kidney tissues. Compared to controls, MDA was significantly higher but GSH level lower in groups II and III. SOD activity was higher in group III, but no difference was determined in group II in liver tissue. In kidney tissue, there was no difference determined in MDA and GSH levels between control and experimental groups but SOD activity in groups II and III was significantly higher. In histologic sections of both experimental liver and kidney tissues, specific degenerations were observed. The results of the present study show that treatment with lithium carbonate may result in liver and kidney tissue abnormalities and oxidative damage.
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