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- W1479850344 abstract "The hydrolysis of trans- and cis-stilbene oxide and benzo[a]pyrene-4,5-oxide was measured in cytosol and microsomes of liver, kidney, and testis of control and clofibrate-fed rats. Significant levels of nonprotein sulfhydryls were detected in cytosol from liver (4.6 mM) and testis (1.5 mM). Glutathione was moderately stable in these fractions and interfered with the partition assays as conjugates were retained in the aqueous phase along with diols. When the products were separated by thin-layer chromatography, significant amounts of glutathione-conjugates were found to have been formed in the cytosol of liver and testis. Overnight dialysis or preincubation of cytosol with 0.5 mM diethylmaleate eliminated conjugate formation without affecting diol production. In dialyzed cytosol from clofibrate-fed rats (0.5%, 14 days), the rates of hydrolysis of trans-stilbene oxide were 506, 171, and 96% of controls for liver, kidney, and testis, respectively, and 126% of controls in liver microsomes. Rates of hydrolysis of cis-stilbene oxide were 149, 172, and 96% of controls in microsomes and 154, 124, and 91% of controls in cytosols from livers, kidneys, and testis of clofibrate-fed rats respectively. Hydrolysis of benzo[a]pyrene-4,5-oxide was similar to that of cis-stilbene oxide. Conjugation of the cis-stilbene oxide with glutathione was detected in cytosols from all three tissues with lesser amounts in the microsomes from liver and kidneys. After clofibrate treatment, the rates of this activity were 200, 173, and 95% of controls in cytosol from liver, kidneys and testis, and 203 and 202% of controls in microsomes from liver and kidneys respectively. These results indicate that epoxide hydrolysis and conjugation in rat liver and kidney are responsive to clofibrate treatment and support other evidence which suggests that hydrolysis of cis- and trans-stilbene oxides in cytosol is catalyzed, in part, by distinct enzymes." @default.
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- W1479850344 date "1986-07-01" @default.
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- W1479850344 title "Epoxide hydrolysis in the cytosol of rat liver, kidney, and testis" @default.
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- W1479850344 doi "https://doi.org/10.1016/0006-2952(86)90573-3" @default.
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