RT Journal Article SR Electronic T1 Differential Involvement of Mrp2 (Abcc2) and Bcrp (Abcg2) in Biliary Excretion of 4-Methylumbelliferyl Glucuronide and Sulfate in the Rat JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 459 OP 467 DO 10.1124/jpet.106.101840 VO 319 IS 1 A1 Maciej J. Zamek-Gliszczynski A1 Keith A. Hoffmaster A1 Joan E. Humphreys A1 Xianbin Tian A1 Ken-ichi Nezasa A1 Kim L. R. Brouwer YR 2006 UL http://jpet.aspetjournals.org/content/319/1/459.abstract AB The hepatic excretion of hydrophilic conjugates, end products of phase II metabolism, is not completely understood. In the present studies, transport mechanism(s) responsible for the biliary excretion of 4-methylumbelliferyl glucuronide (4MUG) and 4-methylumbelliferyl sulfate (4MUS) were studied. Isolated perfused livers (IPLs) from Mrp2-deficient (TR-) Wistar rats were used to examine the role of Mrp2 in the biliary excretion of 4MUG and 4MUS. After a 30-μmol dose of 4-methylumbelliferone, cumulative biliary excretion of 4MUG was extensive in wild-type rat IPLs (25 ± 3 μmol) but was negligible in TR- livers (0.4 ± 0.1 μmol); coadministration of the Bcrp and P-glycoprotein inhibitor GF120918 [N-(4-[2-(1,2,3,4-tetrahydro-6,7-dimethoxy-2-isoquinolinyl)ethyl]-phenyl)-9,10-dihydro-5-methoxy-9-oxo-4-acridine carboxamide] had no effect on 4MUG biliary excretion in wild-type rat IPLs. In contrast, biliary excretion of 4MUS was partially maintained in Mrp2-deficient rat IPLs. Recovery of 4MUS in bile was ∼50 to 60% lower in both control TR- (149 ± 8 nmol) and wild-type IPLs with GF120918 coadministration (176 ± 30 nmol) relative to wild-type control livers (378 ± 37 nmol) and was nearly abolished in TR- IPLs in the presence of GF120918 (13 ± 8 nmol). These changes were the result of decreased rate constants governing 4MUG and 4MUS biliary excretion. In vitro assays and perfused livers from Bcrp and P-glycoprotein gene-knockout mice indicated that 4MUS did not interact with P-glycoprotein but was transported by Bcrp in a GF120918-sensitive manner. In the rat liver, Mrp2 mediates the biliary excretion of 4MUG, whereas both Mrp2 and Bcrp contribute almost equally to the transport of 4MUS into bile. The American Society for Pharmacology and Experimental Therapeutics