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Abstract
Male rats were fed a diet containing 0.5% (w/w) p-chlorophenoxyisobutyric acid (clofibric acid), a hypolipidemic drug. Activities of stearoyl-CoA desaturation in hepatic microsomes were increased approx. 4 times following the administration of clofibric acid for 7 days. An increase in the activity of desaturation of stearic acid was also observed in the liver of clofibric acid-fed rats in vivo. The increase in the activity of microsomal stearoyl-CoA desaturation by clofibric acid-feeding was due to the increase in the activity of terminal desaturase as measured by the rate constant for cytochrome b 5 reoxidation, but not due to the changes in cytochrome b 5 content and NADH-cytochrome b 5 reductase activity. Increases in the activity of stearoyl-CoA desaturation by clofibric acid-feeding were also observed in rats of hormonally altered state, such as diabetic rats, hyperthyroid rats and hypothyroid rats. Percentages of octadecenoic acid in total fatty acid of hepatic lipid were increased with the increase in the activity of stearoyl-CoA desaturation.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism
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