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Xenobiotica
the fate of foreign compounds in biological systems
Volume 42, 2012 - Issue 2
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General Xenobiochemistry

A high throughput in vitro mrp2 assay to predict in vivo biliary excretion

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Pages 157-163 | Received 12 Jul 2011, Accepted 09 Aug 2011, Published online: 02 Oct 2011
 

Abstract

  1. Prediction of biliary excretion is a challenge for drug discovery scientists due to the lack of in vitro assays. This study explores the possibility of establishing a simple assay to predict in vivo biliary excretion via the mrp2 transport system.

  2. In vitro mrp2 activity was determined by measuring the ATP-dependent uptake of 5(6)-carboxy-2′,7′-dichlorofluorescein (CDCF) in canalicular plasma membrane vesicles (cLPM) from rat livers. The CDCF uptake was time- and concentration-dependent (Km of 2.2 ± 0.3 µM and Vmax of 115 ± 26 pmol/mg/min) and strongly inhibited by the mrp2 inhibitors, benzbromarone, MK-571, and cyclosporine A, with IC50 values ≤ 1.1 µM.

  3. Low inhibition of CDCF uptake by taurocholate (BSEP inhibitor; 57 µM) and digoxin (P-gp inhibitor; 101 µM) demonstrated assay specificity towards mrp2.

  4. A highly significant correlation (r2 = 0.959) between the in vitro IC50 values from the described mrp2 assay and in vivo biliary excretion in rats was observed using 10 literature compounds.

  5. This study demonstrated, for the first time, that a high throughput assay could be established with the capability of predicting biliary excretion in the rat using CDCF as a substrate.

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