Effect of Pregnane X Receptor Ligands on Transport Mediated by Human OATP1B1 and OATP1B3

Overview

Journal Eur J Pharmacol

Specialty Pharmacology

Date 2008 Mar 7

PMID 18321482

Citations 68

Authors

Chunshan Gui

Yi Miao

Lucas Thompson

Bret Wahlgren

Melissa Mock

Bruno Stieger

Bruno Hagenbuch

Affiliations

Soon will be listed here.

Abstract

The pregnane X receptor is a ligand-activated transcription factor that is abundantly expressed in hepatocytes. Numerous drugs are pregnane X receptor ligands. To bind to their receptor they must cross the sinusoidal membrane. Organic anion transporting polypeptides 1B1 and 1B3 (OATP1B1 and OATP1B3) are polyspecific transporters expressed at the sinusoidal membrane of human hepatocytes. They mediate transport of a variety of drugs including the pregnane X receptor ligands rifampicin and dexamethasone. To test whether additional pregnane X receptor ligands interact with OATP1B1- and 1B3-mediated transport, we developed Chinese Hamster Ovary (CHO) cell lines stably expressing OATP1B1 or 1B3 at high levels. OATP1B1- and 1B3-mediated estradiol-17beta-glucuronide uptake was inhibited by several pregnane X receptor ligands in a concentration dependent way. IC(50) values for rifampicin, paclitaxel, mifepristone, and troglitazone were within their respective pharmacological free plasma concentrations. Kinetic analysis revealed that clotrimazole inhibits OATP1B1-mediated estradiol-17beta-glucuronide transport with a K(i) of 7.7+/-0.3 microM in a competitive way. However, uptake of OATP1B3-mediated estradiol-17beta-glucuronide was stimulated and this stimulation was due to an increased apparent affinity. Transport of estrone-3-sulfate was hardly affected while all other substrates tested were inhibited. Additional azoles like fluconazole, ketoconazole and miconazole did not stimulate OATP1B3-mediated estradiol-17beta-glucuronide transport. In summary, these results demonstrate that pregnane X receptor ligands, by inhibiting or stimulating OATP-mediated uptake, can lead to drug-drug interactions at the transporter level.

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