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• W1596882142 abstract "Horseradish peroxidase rapidly catalyzed the H2O2-dependent polymerization of acetaminophen. Acetaminophen polymerization was decreased and formation of GSSG and minor amounts of GSH-acetaminophen conjugates were detected in reaction mixtures containing GSH. These data suggest that horseradish peroxidase catalyzed the 1-electron oxidation of acetaminophen and that GSH decreased polymerization by reducing the product, N-acetyl-p-benzosemiquinone imine, back to acetaminophen. Analyses of reaction mixtures that did not contain GSH showed N-acetyl-p-benzoquinone imine formation shortly after initiation of reactions. When GSH was added to similar reaction mixtures at various times, 3-(glutathion-S-yl)-acetaminophen was formed. The formation and disappearance of this product were very similar to N-acetyl-p-benzoquinone imine formation and were consistent with the disproportionation of 2 mol of N-acetyl-p-benzosemiquinone imine to 1 mol of N-acetyl-p-benzoquinone imine and 1 mol of acetaminophen followed by the rapid reaction of N-acetyl-p-benzoquinone imine with GSH to form 3-(glutathion-S-yl)acetaminophen. When acetaminophen was incubated with NADPH, oxygen and hepatic microsomes from phenobarbital-pretreated rats, 1.2 nmol 3-(glutathion-S-yl)acetaminophen/nmol cytochrome P-450/10 min was formed. Formation of polymers was not observed indicating that N-acetyl-p-benzoquinone imine was formed via an overall 2-electron oxidation rather than a disproportionation reaction. However, when cumene hydroperoxide was replaced by NADPH in microsomal incubations, polymerization was observed suggesting that cytochrome P-450 might also catalyze the 1-electron oxidation of acetaminophen." @default.
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• W1596882142 date "1987-01-01" @default.
• W1596882142 modified "2023-10-12" @default.
• W1596882142 title "Mechanisms of acetaminophen oxidation to N-acetyl-P-benzoquinone imine by horseradish peroxidase and cytochrome P-450." @default.
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• W1596882142 doi "https://doi.org/10.1016/s0021-9258(19)75735-4" @default.
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