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- W2077313256 abstract "The cytochrome P-450 isoforms involved in territrem A (TRA) metabolism in liver microsomes of male Wistar rats have been characterized. Pretreatment with phenobarbital (PB) or dexamethasone (DEX) resulted in a similar significant increase in TRA metabolic activity. Although PB treatment resulted in a significant elevation in CYP2B, CYP2C11, and CYP3A levels, only CYP3A levels were significantly increased by DEX treatment. Cimetidine markedly reduced the formation of the TRA metabolites 4beta-hydroxymethyl-4beta-demethylterritrem A (MA(1)), 4beta-oxo-4beta-demethylterritrem A (MAX) and 2-dihydro-4beta-demethylterritrem A (MA(2)) in liver microsomes from 2-wk-old rats (mainly containing CYP3A2) and 7-wk-old rats (containing CYP2B, CYP2C11, and CYP3A2). SKF 525A, which inhibits CYP2B, CYP2C11, and CYP3A2, and orphenadrine, which inhibits CYP2B, also decreased MA(2) formation in liver microsomes from 7-wk-old phenobarbital-pretreated rats. The formation of MA(1) and MAX was not affected. Furthermore, an immunoinhibition study demonstrated that anti-CYP3A2 antibody reduced MA(1), MAX, and MA(2) formation to nondetectable levels in liver microsomes from 2- and 7-wk-old rats, whereas anti-CYP2C11 or anti-CYP2B antibody, respectively, had no marked effect on MA(1), MAX, and MA(2) formation in liver microsomes from 7-wk-old untreated or PB-treated rats. These results suggest that the CYP3A isoform is mainly responsible for MA(1), MAX, and MA(2) formation in liver microsomes in male Wistar rats." @default.
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- W2077313256 date "2002-12-27" @default.
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- W2077313256 title "METABOLISM OF TERRITREM A IN LIVER MICROSOMES FROM MALE WISTAR RATS: 3. CYTOCHROME P-450 ISOFORMS CATALYZING TRA METABOLISM" @default.
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- W2077313256 doi "https://doi.org/10.1080/00984100290071531" @default.
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