Home
Resources
Publications
Differential Involvement of Mrp2 (Abcc2) and Bcrp (Abcg2) in Biliary Excretion of 4-methylumbelliferyl Glucuronide and Sulfate in the Rat

Differential Involvement of Mrp2 (Abcc2) and Bcrp (Abcg2) in Biliary Excretion of 4-methylumbelliferyl Glucuronide and Sulfate in the Rat

Maciej J Zamek-Gliszczynski, Keith A Hoffmaster, Joan E Humphreys, Xianbin Tian, Ken-Ichi Nezasa, Kim L R Brouwer

J Pharmacol Exp Ther. 2006 Oct;319(1):459-67.

PMID: 16857726

Abstract:

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-micromol dose of 4-methylumbelliferone, cumulative biliary excretion of 4MUG was extensive in wild-type rat IPLs (25 +/- 3 micromol) but was negligible in TR(-) livers (0.4 +/- 0.1 micromol); 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 approximately 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP15220118	4-Methylumbelliferyl sulfate potassium salt		15220-11-8	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: