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- W2003255722 abstract "The effect of three inhibitors of mitochondrial function (menadione, rotenone and 2,4-dinitrophenol) on drug metabolism in isolated rat hepatocytes has been studied. Menadione (at 1.25 × 10−4 M) caused almost complete inhibition of biphenyl Phase I metabolism whereas rotenone (2 × 10−5 M) inhibited the same reaction only by 25 per cent although the subsequent conjugation of the Phase I metabolite was markedly depressed. Qualitatively similar findings were observed with hepatocytes isolated from phenobarbital-pretreated rats, and with liver microsomes isolated from control rats. 2,4-Dinitrophenol (2 × 10−4 M) caused a marked enhancement of biphenyl Phase I metabolism but a marked inhibition of subsequent conjugation. This enhancement of Phase I metabolism was not observed in control cells with other substrates (benzo[a]pyrene, 7-ethoxycoumarin), nor in biphenyl metabolism in “induced” cells or in liver microsomes isolated from control rats. It is tentatively suggested that products of 2,4-dinitrophenol metabolism may “activate” biphenyl metabolism in intact liver cells. Furthermore, it is suggested for all three inhibitors that direct effects on the drug metabolizing enzyme systems (Phase I and Phase II) are as important as their effects on mitochondrial function in explaining their inhibition of drug metabolism. It appears that Phase II metabolism of xenobiotics is more susceptible to inhibition by metabolic inhibitors than is Phase I metabolism, probably due to depletion of the cellular ATP levels." @default.
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- W2003255722 date "1979-11-01" @default.
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- W2003255722 title "Effect of various metabolic inhibitors on biphenyl metabolism in isolated rat hepatocytes" @default.
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- W2003255722 doi "https://doi.org/10.1016/0006-2952(79)90127-8" @default.
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