Abstract

The possible involvement of lipid peroxidation (LPO) in the lead-induced inhibition of type I iodothyronine 5'-monodeiodinase activity (5'-D) has been worked out in chicken liver. Lead nitrate (1.5 mg per bird per day) for 30 days increased the lipid peroxidative process with a concomitant decrease in 5'-D activity in chicken liver. Also, a significant decrease in serum triiodothyronine (T3) concentration and an increase in serum thyroxine (T4) concentration were observed. The data suggest that lead-induced inhibition of type I 5'-D activity in chicken liver is mediated through the lipid peroxidative process.

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