Human organic anion transporting polypeptide-C (SLC21A6) is a major determinant of rifampin-mediated pregnane X receptor activation

Rommel G. Tirona, Brenda F. Leake, Allan W. Wolkoff, Richard B. Kim

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259 Citations (Scopus)

Abstract

Rifampin, a member of the rifamycin class of antibiotics, is well known for its ability to induce drug-metabolizing enzymes and transporters, through activation of the pregnane X receptor. Available data suggest rifampin entry into hepatocytes may be transporter-mediated. Accordingly, it is therefore plausible that modulation of the achievable intracellular concentration of rifampin by drug uptake transporters would influence the degree of induction. In this study, we expressed an array of known hepatic uptake transporters to show the key hepatic rifampin uptake transporters are liver-specific members of the organic anion transporting polypeptide family (OATP). Indeed, both OATP-C and OATP8 seemed capable of mediating rifampin uptake into HeLa cells. OATP-C, however, seemed to have far greater affinity and capacity for rifampin transport. In addition, several allelic variants of OATP-C known to be present among European and African Americans were found to have markedly decreased rifampin transport activity. In cell-based, transactivation assays, OATP-C expression was associated with increased cellular rifampin retention as well as potentiation of PXR reporter gene activity. This is the first demonstration of an uptake transporter such as OATP-C, in modulating PXR function, and sheds important new insight into our understanding of the molecular determinants of PXR-mediated inductive processes.

Original languageEnglish (US)
Pages (from-to)223-228
Number of pages6
JournalJournal of Pharmacology and Experimental Therapeutics
Volume304
Issue number1
DOIs
StatePublished - Jan 1 2003

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Rifampin
Anions
Liver
Aptitude
polypeptide C
pregnane X receptor
Reporter Genes
HeLa Cells
Pharmaceutical Preparations
African Americans
Transcriptional Activation
Hepatocytes
Anti-Bacterial Agents
Peptides
Enzymes

ASJC Scopus subject areas

  • Pharmacology

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Human organic anion transporting polypeptide-C (SLC21A6) is a major determinant of rifampin-mediated pregnane X receptor activation. / Tirona, Rommel G.; Leake, Brenda F.; Wolkoff, Allan W.; Kim, Richard B.

In: Journal of Pharmacology and Experimental Therapeutics, Vol. 304, No. 1, 01.01.2003, p. 223-228.

Research output: Contribution to journalArticle

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