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Received for publication March 4, 2005.
Revised May 17, 2005.
Accepted for publication May 17, 2005.
Until recently, it was generally believed that the transport of various organic anions across the bile canalicular membrane was mainly mediated by multidrug resistance associated protein 2 (MRP2/ABCC2). However, a number of new reports have shown that some organic anions are also substrates of multidrug resistance 1 (MDR1/ABCB1) and/or breast cancer resistance protein (BCRP/ABCG2), implying MDR1 and BCRP could also be involved in the biliary excretion of organic anions in humans. In the present study, we constructed new double transfected Madin-Darby canine kidney II (MDCKII) cells expressing organic anion transporting polypeptide 1B1 (OATP1B1)/MDR1 and OATP1B1/BCRP, and we investigated the transcellular transport of four kinds of organic anions, estradiol-17
-D-glucuronide (EG), estrone-3-sulfate (ES), pravastatin (PRA) and cerivastatin (CER), to identify which efflux transporters mediate the biliary excretion of compounds using double transfected cells. We observed the vectorial transport of EG and ES in all the double transfectants. MRP2 showed the highest efflux clearance of EG among these efflux transporters, while BCRP-mediated clearance of ES was the highest in these double transfectants. In addition, two kinds of HMG-CoA reductase inhibitors, CER and PRA, were also substrates of all these efflux transporters. The rank order of the efflux clearance of PRA mediated by each transporter was the same as that of EG, whereas the contribution of MDR1 to the efflux of CER was relatively greater than for PRA. This experimental system is very useful for identifying which transporters are involved in the biliary excretion of organic anions which cannot easily penetrate the plasma membrane.
Key words:
BCRP, MDR1, MRP2, biliary excretion, double transfectant, organic anion
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