Abstract
Alterations in microsomal drug metabolizing enzymes and phospholipids following prolonged exposure to chloroquine have been investigated. The levels of microsomal aminopyrine- N-demethylase, aniline hydroxylase and both microsomal and cytosolic glutathione- S-transferase are reduced in treated rats. Microsomal epoxide hydrolase is unaffected by the treatment. An increase in the cholesterol-phospholipid ratio and a decrease in the phosphocholine-sphingomyelin ratio occur. There is a general reduction in the total microsomal phospholipid level though the percentage content of sphingomyelin is higher in all cases. The reduction in microsomal phospholipid level is probably due to a reduced incorporation of acetate into microsomal phospholipids as shown in this study using radioactive sodium acetate.
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