Retinoids induce cytochrome P450 3A4 through RXR/VDR-mediated pathway

Kun Wang, Shiyong Chen, Wen Xie, Yu-Jui Yvonne Wan

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

A panel of retinoids and carotenoids was screened as potential inducers of CYP3A4 through the RXR/VDR-mediated signaling pathway. Transient transfection assays revealed that 3 out of 12 retinoids screened transactivated RXRα/VDR and induced CYP3A4 reporter activity. These three retinoids are the active metabolites of retinoids, 9-cis-retinal, 9-cis-retinoic acid (9-cis-RA), and all-trans-retinoic acid (all-trans-RA). 9-cis-RA and all-trans-RA preferentially transactivated the RXR/VDR heterodimers and RXR homodimers. Retinoids and VDR agonist 1α, 25-dihydroxyvitamin D3, but not PXR or CAR activator, could induce Cyp3a11 mRNA level in hepatocytes derived from PXR/CAR-double null mouse. Moreover, retinoids induced CYP3A4 enzyme activity in HepG2 human hepatoma and Caco-2 human colorectal adenocarcinoma cells. A direct role of retinoid-mediated CYP3A4 induction through RXRα/VDR was proved by the results that 9-cis-retinal, 9-cis-RA, and all-trans-RA recruited RXRα and VDR to CYP3A4 regulatory region pER6 (proximal everted repeat with a 6-nucleotide spacer) and dXREM (distal xenobiotic-responsive enhancer module). Thus, using various approaches, we have unequivocally demonstrated that retinoids transactivate RXR/VDR heterodimers and RXR homodimers and induce CYP3A expression at mRNA as well as enzyme activity levels in both liver and intestinal cells. It is possible that retinoids might alter endobiotic metabolism through CYP3A4 induction in vivo.

Original languageEnglish (US)
Pages (from-to)2204-2213
Number of pages10
JournalBiochemical Pharmacology
Volume75
Issue number11
DOIs
StatePublished - Jun 1 2008
Externally publishedYes

Fingerprint

Cytochrome P-450 CYP3A
Retinoids
Tretinoin
Enzyme activity
Messenger RNA
Calcitriol
Nucleic Acid Regulatory Sequences
Xenobiotics
Enzymes
Carotenoids
Metabolites
Metabolism
Liver
Transfection
Hepatocytes
Hepatocellular Carcinoma
Assays
Adenocarcinoma
Nucleotides

Keywords

  • CYP3A4
  • Retinoid
  • RXR
  • VDR

ASJC Scopus subject areas

  • Pharmacology

Cite this

Retinoids induce cytochrome P450 3A4 through RXR/VDR-mediated pathway. / Wang, Kun; Chen, Shiyong; Xie, Wen; Wan, Yu-Jui Yvonne.

In: Biochemical Pharmacology, Vol. 75, No. 11, 01.06.2008, p. 2204-2213.

Research output: Contribution to journalArticle

Wang, Kun ; Chen, Shiyong ; Xie, Wen ; Wan, Yu-Jui Yvonne. / Retinoids induce cytochrome P450 3A4 through RXR/VDR-mediated pathway. In: Biochemical Pharmacology. 2008 ; Vol. 75, No. 11. pp. 2204-2213.
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