Effective dosing regimen of 1-aminobenzotriazole for inhibition of antipyrine clearance in guinea pigs and mice using serial sampling

Drug Metabolism and Disposition : the Biological Fate of Chemicals
Suresh K BalaniFrank W Lee

Abstract

Single-dose pharmacokinetics of 1-aminobenzotriazole (ABT), a potent nonspecific inhibitor of cytochromes P450 (P450s), were characterized after oral administration to mice and guinea pigs at doses of 50, 100, and 150 mg/kg using serial sampling in both species. Only 30-microl blood samples were drawn from jugular vein-cannulated mice using Microvette capillary tubes containing lithium heparin. A comparison of the pharmacokinetics of antipyrine (AP) administered i.v. at 20 mg/kg to mice followed by serial and terminal sampling techniques yielded similar results. The ABT concentrations in plasma were sustained at high levels (5-100 microM) for at least 12 h in both species. Pretreatment of animals with ABT 2 h prior to AP administration decreased the plasma AP clearance by about 95% in mice at all ABT doses studied and 84, 95, and 95% in guinea pigs at a dose of 50, 100, and 150 mg/kg ABT, respectively. In vitro, the dissociation constants (KI) for ABT as the P450 mechanism-based inactivator were determined to be 45.6 and 193 microM, and the maximal inactivation rate constants (kinact) were determined to be 0.089 and 0.075 min(-1) for the mouse and guinea pig liver microsomes, respectively. The projected P450 inactivations at th...Continue Reading

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