Abstract
1. In previous studies we have shown that hepatic copper and zinc increases and liver microsomal cytochrome P-450 activities greatly decreases in adjuvant arthritic rats. 2. In the present paper we study if the changes in copper and zinc could be related to depression of drug microsomal activity. Thus, the effect of in vitro addition of copper or zinc to microsomal fraction upon aminopyrine N-demethylase (AND) and aniline p-hydroxylase (APH) activity was measured. 3. Both metals produced an inhibition of enzyme activity. The reduction of AND and APH activities produced by copper (ID 25 = 4.7 × 10 −5 M to AND; 1.05 × 10 −5 M to APH) was greater than that obtained with zinc (ID 25 = 2.26 × 10 −4 M to AND; 3.3 × 10 −4M to APH).
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