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- W1772333023 abstract "Acyl glucuronides are electrophilic metabolites that are readily hydrolyzed, undergo intramolecular rearrangement, and mediate the covalent binding of many acidic drugs to endogenous proteins. Gemfibrozil is extensively metabolized to gemfibrozil acyl glucuronide in humans and rats. The aims of this study were to demonstrate the reactivity of gemfibrozil glucuronide, determine whether gemfibrozil formed covalently bound protein adducts in vivo, describe the pharmacokinetics of adduct formation, and examine the role of gemfibrozil glucuronide in adduct formation. Rats were administered 150 mg/kg gemfibrozil daily for up to 37 days and killed 1, 2, 5, 10, 19, and 37 days after commencement of dosing, and 1, 2, 3, 8, 17, and 30 days after cessation of dosing. Plasma, liver, kidney, and heart were examined for adduct formation. Plasma was quantitatively the most important site for formation of gemfibrozil-protein adducts with mean (SE) steady-state concentrations of 31.40 (2.40) ng/mg protein attained by approximately the 10th day of dosing. Adduct half-life in plasma was 3.1 days, consistent with the elimination half-life of albumin. Mean (SE) kidney, liver, and heart steady-state adduct concentrations were 2.13 (0.11), 0.89 (0.35), and 0.95 (0.07) ng/mg protein, respectively. The rate of gemfibrozil-protein adduct accumulation seemed greatest in liver, but was similar in kidney and plasma, with approximately 2x, 16x, and 30x accumulation, respectively, over the dosing interval. In all tissues, adduct half-lives were significantly greater than those of the noncovalently bound gemfibrozil or gemfibrozil glucuronide.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W1772333023 created "2016-06-24" @default.
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- W1772333023 date "1995-09-01" @default.
- W1772333023 modified "2023-10-17" @default.
- W1772333023 title "Reactivity of gemfibrozil 1-o-beta-acyl glucuronide. Pharmacokinetics of covalently bound gemfibrozil-protein adducts in rats." @default.
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