Effect of selenium-induced oxidative stress on the oxidation reduction system and reproductive ability of male mice

The present study was carried out to evaluate the effect of selenium (Se)-induced oxidative stress on the oxidation reduction system and the fertility status of male mice. Different levels of Se, a potent antioxidant, were fed in three separate groups for 8 wk to create the different oxidative stress in mice. A significant decrese in the glutathione peroxidase (GSH-Px) in both liver and testis was observed in the Se-deficient (0.02 ppm) group I, whereas enzyme levels in the Se-excess (1 ppm) group were comparable to the Se-adequate (0.2 ppm) group. Glutathione-S-transferase activity was enhanced in group I in comparison to group II; however, no change was seen in group III. The glutathione reductase and superoxide dismutase activities were decreased in the Se-deficient group, whereas the enzyme levels were significantly increased in the Se-excess group. The fertility status of the animals studied in terms of percentage fertility and litter size showed a significant decrease in the reproductive ability of male mice in group I when compared to group II. No changes in the fertility status of animals were observed in group III. Thus, the data clearly indicate the effect of oxidative stress generated by feeding various Se levels on the oxidation reduction system and, consequently, its effect on the reproductive ability of male mice.