Add time:08/16/2019         Source:sciencedirect.com

Eight structurally diverse hypolipidaemic agents have been examined for their ability to induce the microsomal cytochrome P-452 (cas 12679-56-0)-dependent fatty acid hydroxylase system and the enzymes of peroxisomal β-oxidation in rat liver. Using a specific ELISA method, we have shown that the cytochrome P-452 isoenzyme is induced up to ten fold by hypolipidaemic challenge, concomitant with a pronounced elevation of the peroxisomal β-oxidation enzymes, mirrored by an increase in peroxisomal volume as determined morphometrically. In addition, the induction of cytochrome P-452 is accompanied by a decrease in the activities of cytochromes P-450b and P-450c as measured by benzphetamine N-demethylase and ethoxyresorufin O-deethylase activities respectively, the latter being more extensively reduced by hypolipidaemic treatment. A hypothesis is presented whereby an early biological response is the hypolipidaemic induction of microsomal cytochrome P-452 resulting in ω-hydroxy fatty acids and their subsequent further oxidation to dicarboxylic acids, the latter providing the proximal stimulus for peroxisomal proliferation.

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