We investigated the effects of the dietary addition of orotic acid on liver antioxidant enzymes, mRNA levels of these enzymes, and peroxidative products by comparing casein with soy protein as the source of dietary protein. Rats fed the casein diet accumulated more liver lipids than those fed the soy protein diet when orotic acid was added. The addition of orotic acid lowered both the activity of liver Cu, Zn-superoxide dismutase and the level of Cu, Zn-superoxide dismutase mRNA. The addition of orotic acid led to a significant increase in the contents of conjugated dienes and protein carbonyls in the liver. In addition, dietary soy protein protected the increase in the levels of lipids and proteins peroxide induced by orotic acid. The addition of orotic acid to the casein diet increased the activities of both serum ornithine carbamoyltransferase and alanine aminotransferase. Thus, liver damage might result from the increased superoxide anion due to the decrease in the activity of hepatic superoxide dismutase, as well as increase in the production of hepatic peroxidative products in rats fed the casein diet with orotic acid.
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