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Toxicology Program, Departments of Pharmaceutical Sciences (C.C., J.E.M.), and Pathobiology (G.E.H.), University of Connecticut, Storrs, Connecticut
The involvement of the canalicular multidrug resistance protein 2 (Mrp2) in the hepatobiliary excretion of acetaminophen (APAP)-glutathione (GSH) conjugate and its derivatives was investigated using transport-deficient (TR- rats. Although no differences in the biliary concentration of APAP itself were detected between normal Wistar and TR- rats, significant differences in the biliary disposition of several conjugated metabolites of APAP were detected. APAP-GSH was virtually absent in bile from TR- rats. Also, biliary concentrations of APAP-mercapturate (NAC; N-acetylated L-cysteine) and APAP-GLU were significantly reduced in TR- rats. No differences in the biliary concentration of APAP-cysteinylglycine/cysteine (CG/CYS) were detected between normal and mutant rats. The cumulative amounts of APAP-CG/CYS and APAP-NAC excreted in urine of mutant rats were decreased, whereas APAP-GLU was markedly increased. Analysis of liver samples revealed that APAP-GSH and APAP-NAC accumulate in mutant rat livers. Our results support the direct involvement of Mrp2 in the hepatobiliary excretion of several conjugated metabolites of APAP, including APAP-GSH and APAP-NAC, and provide relevant information on processes that may be involved with both their hepatic basolateral transport and renal elimination.
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