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Two month-old Wistar male albino rats were exposed during a 30-day period to a daily oral intake ad libitum of either 200 microg/mL Cd (as CdCl2), 0.1 microg/mL Se (as Na-selenite), or the same dosages of Cd + Se in drinking water. The daily intake from the water was calculated to be 15 mg Cd/kg and 7 microg Se/kg. Cadmium (Cd) accumulates in the heart (p < 0.005) and, in rats, decreases both body mass growth (p < 0.005) and heart mass (p < 0.02). Selenium (Se) significantly decreases the negative effect of Cd on body mass growth. In the hearts of Cd-treated rats, cadmium caused the decrease (p < 0.05) of selenium-dependent glutathione peroxidase (GSH-Px, EC 1.11.1.9) activity. At the same time, the activities of total superoxide dismutase (total SOD, EC 1.15.1.1), manganese-containing superoxide dismutase (Mn SOD), and copper-zinc-containing superoxide dismutase (CuZn SOD) were increased (p < 0.005). The activities of total SOD, CuZn SOD (p < 0.005), GSH-Px (p < 0.02), and glutathione-S-transferase (GST, p < 0.005) were increased in the hearts of Se-treated rats. However, by concomitant administration of Cd and Se, these changes were diminished (total SOD, GST) or were completely eliminated (Mn SOD, GSH-Px). These results indicate that Se only partly diminishes the effects of Cd cardiotoxicity.
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