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Retinoids activate RXR/CAR-mediated pathway and induce CYP3A.

Shiyong Chen1, Kun Wang, Yu-Jui Yvonne Wan

  • 1Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Biomedical Research Center Building/KLSIC, 2146 W 39th Avenue, Kansas City, KS 66160, USA.

Biochemical Pharmacology
|August 19, 2009
PubMed
Summary

Retinoids, including all-trans retinoic acid (RA) and 9-cis RA, activate the RXR/CAR pathway. This activation effectively regulates CYP3A gene expression via specific nuclear receptor elements.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Retinoids and carotenoids are recognized for their antioxidant properties and potential in cancer prevention.
  • The regulation of drug-metabolizing enzymes, such as those in the Cytochrome P450 family, is crucial for drug efficacy and toxicity.

Purpose of the Study:

  • To investigate the impact of retinoids and carotenoids on the Retinoid X Receptor (RXR)/Constitutive Androstane Receptor (CAR) pathway.
  • To determine how these compounds modulate Cytochrome P450 3A (CYP3A) gene expression.

Main Methods:

  • Transient transfection assays using HepG2 cells with a CYP3A4 gene reporter construct (tk-(3A4)(3)-Luc).
  • Evaluation of luciferase activity to assess pathway activation.
  • Chromatin immunoprecipitation (ChIP) assays to identify receptor recruitment to gene promoter regions.

Main Results:

  • Five out of thirteen tested retinoids significantly induced RXRalpha/CAR-mediated activation of the CYP3A4 reporter.
  • All-trans retinoic acid (RA) and 9-cis RA demonstrated greater efficacy than the CAR agonist TCBOPOP.
  • Retinoids were shown to recruit RXRalpha and CAR to specific response elements (ER6 and XREM) on the CYP3A4 promoter.

Conclusions:

  • Retinoids can effectively regulate CYP3A gene expression through the RXR/CAR-mediated pathway.
  • Specific retinoids show potent induction of the CYP3A4 gene via RXRalpha/CAR and RXRgamma/CAR heterodimers.
  • These findings highlight a novel mechanism for retinoid-mediated regulation of drug metabolism genes.