Accessible Requires Authentication Published by De Gruyter July 19, 2005

A role for constitutive androstane receptor in the regulation of human intestinal MDR1 expression

Oliver Burk, Katja A. Arnold, Anke Geick, Heike Tegude and Michel Eichelbaum
From the journal

Abstract

MDR1/P-glycoprotein is an efflux transporter determining the absorption and presystemic elimination of many xenobiotics in the gut. Thus, interindividual differences in MDR1 expression may affect the efficacy of drug treatment. The expression of MDR1 is partially controlled by the pregnane X receptor (PXR), which mediates induction by many xenobiotics. Since it has been described that the nuclear receptors PXR and constitutive androstane receptor (CAR) can bind to the same binding sites, we investigated the role of CAR in the regulation of MDR1 gene expression. We demonstrate here by gel shift and transfection experiments that CAR binds to distinct nuclear receptor response elements in the -7.8 kbp enhancer of MDR1 and transactivates MDR1 expression through DR4 motifs to which the receptor binds as a heterodimer with RXR or as a monomer, respectively. Expression of the endogenous MDR1 gene is elevated in cells stably expressing CAR, thus arguing for the functional relevance of CAR-dependent activation of MDR1. The physiological relevance of the regulation of MDR1 by CAR is further suggested by correlation of the expression of CAR and MDR1 in the human small intestine. In summary, our data suggest that CAR plays a role in the regulation of intestinal MDR1 expression.

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Published Online: 2005-07-19
Published in Print: 2005-06-01

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