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- W2000800942 abstract "Chlorobenzene is converted to mixture of o-, m-, and p-chlorophenols in perfused rat livers, and in the following cell-free hepatic preparations from rat: postmitochondrial supernatant, microsomes, and reconstituted soluble hemoprotein systems. The percentage of m-chlorophenol steadily decreases with increasing resolution of the hemoprotein-monoxygenase system. Prior treatment of rats with 3-methylcholanthrene results in a large increase in rate of formation of the ortho isomer in all hepatic systems. Prior treatment with phenobarbital results in moderate increases in rates of formation of all three chlorophenols. Formation of the three chlorophenols is inhibited to similar extents by carbon monoxide, metyrapone, and high concentrations of glutathione. SKF-525a and 7,8-benzoflavone inhibit formation of o- and p-chlorophenols to a greater extent than that of the meta isomer; with microsomal preparations NADH greatly potentiates NADPH-dependent formation of p-chlorophenol, moderately potentiates formation of m-chlorophenol and has little effect on formation of o-chlorophenol. Dihydrodiols are not significant metabolites of Chlorobenzene with the soluble hemoprotein systems. These results, in concert with changes in proportions of phenolic metabolites seen during resolution of hepatic systems from the intact cell of the perfused liver to the soluble hemoprotein, are at least consonant with the hypothesis that chlorophenol production from Chlorobenzene is catalyzed by three different enzymes, two of which form arene oxide intermediates and one of which catalyzes a direct formation of a phenol. Thus, o- and p-chlorophenols result, respectively, on isomerization of intermediate 3- and 4-chlorobenzene oxides, while formation of m-chlorophenol would appear to occur via a direct oxidative pathway. In vitro conjugation of the arene oxide with glutathione or hydration is not a significant pathway. Assay of chlorophenols and dihydrodiols of Chlorobenzene was by high-pressure liquid chromatography." @default.
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- W2000800942 date "1975-05-01" @default.
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- W2000800942 title "Metabolism of chlorobenzene with hepatic microsomes and solubilized cytochrome P-450 systems" @default.
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- W2000800942 doi "https://doi.org/10.1016/0003-9861(75)90255-6" @default.
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