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1. The liver microsomal metabolism of [4-14C]cholesterol, endogenous cholesterol, 7 alpha-hydroxy-4-[6 beta-3H]cholesten-3-one, 5-beta-[7 beta-3H]cholestane-3 alpha, 7 alpha-diol and [3H]lithocholic acid was studdied in control and clofibrate (ethyl p-chlorophenoxyisobutyrate)-treated rats. 2. The extent of 7 alpha-hydroxylation of exogenous [414C]cholesterol and endogenous cholesterol, the latter determined with a mass fragmentographic technique, was the same in the two groups of rats. The extent of 12 alpha-hydroxylation of 7 alpha-hydroxy-4-cholesten-3-one and 5 beta-cholestane-3 alpha, 7 alpha-diol was increased by about 60 and 120% respectively by clofibrate treatment. The 26-hydroxylation of 5 beta-cholestane-3 alpha, 7 alpha-diol was not significantly affected by clofibrate. The 6 beta-hydroxylation of lithocholic acid was about 80% higher in the clofibrate-treated animals than in the controls. 3. The results are discussed in the context of present knowledge about the liver microsomal hydroxylating system and bile acid formation in patients with hypercholesterolaemia, treated with clofibrate.

Effects of clofibrate on some microsomal hydroxylations involved in the formation and metabolism of bile acids in rat liver