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Curr Pharmacol Rep. 2016 Aug;2(4):187-192. doi: 10.1007/s40495-016-0062-1. Epub 2016 May 04.

A Molecular Aspect in the Regulation of Drug Metabolism: Does PXR-Induced Enzyme Expression Always Lead to Functional Changes in Drug Metabolism?.

Current pharmacology reports

Yuan Wei, Chenxiao Tang, Vinayak Sant, Song Li, Samuel M Poloyac, Wen Xie

Affiliations

  1. Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, 306 Salk Pavilion, 335 Sutherland Drive, Pittsburgh, PA 15261, USA.

PMID: 27795941 PMCID: PMC5082989 DOI: 10.1007/s40495-016-0062-1

Abstract

Pregnane X receptor (PXR, NR112) is a xenobiotic receptor whose primary function is to regulate the expression of drug-metabolizing enzymes (DMEs) and drug transporters. Drug-induced PXR activation and subsequent enzyme and transporter induction has been proposed to be an important mechanism for the drug-drug interactions. In addition to activating PXR, many pharmaceutical chemicals can also function as reversible or irreversible inhibitors of DMEs, which may also impact the pharmacokinetics and pharmacodynamics (PK/PD) of drugs. Therefore, we cannot simply conclude that the PXR-induced alteration in enzyme expression always reflects functional changes. We should consider both PXR activation and DMEs inhibition to improve drug safety in the clinic.

Keywords: Drug metabolism; Enzyme inhibition; Gene regulation; Nuclear receptor

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