title: Rat liver microsomal progesterone metabolism: evidence for differential troleandomycin and pregnenolone 16 alpha-carbonitrile inductive effects in the cytochrome P-450 III family.
abstract: The effect of Troleandomycin (TAO) and pregnenolone 16 alpha-carbonitrile (PCN) on the hepatic microsomal progesterone metabolism in the rat is evaluated. Over thirteen hydroxylated progesterone derivatives are detected, including the novel 6 beta, 21-, 6 beta, 16 alpha-, 6 beta, 16 beta- and 2,21-dihydroxy derivatives, suggesting the induction of several cytochrome P-450 isozymes. PCN treatment results overall in an augmented production of progesterone metabolites whereas TAO treatment both induces and represses specific hydroxylase activities. Progesterone metabolism with purified isozymes isolated from liver microsomes from TAO and PCN treated rats differs significantly from that observed with intact microsomes, reflecting the complexity of the induction pattern of the cytochrome P-450 III family.
authors: Institut National de la Santé et de la Recherche Médicale, Montpellier, France.
authors: C
authors: C
authors: Larroque
authors: R
authors: R
authors: Lange
authors: P
authors: P
authors: Maurel
authors: R
authors: R
authors: Langlois
authors: J E
authors: JE
authors: van Lier
mesh_terms: D000818:Animals; D002855:Chromatography, Thin Layer; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D004790:Enzyme Induction / Q000187:drug effects*; D007527:Isoenzymes / Q000096:biosynthesis; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology*; D010084:Oxidation-Reduction; D011285:Pregnenolone Carbonitrile / Q000494:pharmacology; D011374:Progesterone / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D014217:Troleandomycin / Q000494:pharmacology
chemical_list: D007527:Isoenzymes; D011285:Pregnenolone Carbonitrile; D011374:Progesterone; D003577:Cytochrome P-450 Enzyme System; D014217:Troleandomycin