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Genomic characterization and regulation of CYP3a13: role of xenobiotics and nuclear receptors
- Source :
- The FASEB Journal. 17:1736-1738
- Publication Year :
- 2003
- Publisher :
- Wiley, 2003.
-
Abstract
- We report that CYP3a13 gene, located on mouse chromosome 5, spans 27.5 Kb and contains 13 exons. The transcription start site is 35 bp upstream of the coding region and results in a 109 bp 5' untranslated region. CYP3a13 promoter shows putative binding sites for retinoid X receptor, pregnane X receptor, and estrogen receptor. CYP3a13 shows a broad tissue distribution with predominant expression in liver. Although CYP3a13 shares 92% nucleotide identity with the female-specific rat CYP3A9, its expression does not exhibit sexual dimorphism. Ligand activation of peroxisomal proliferator-activated receptor-gamma and retinoid X receptor inhibit expression of CYP3a13 at the transcription level in a tissue-specific manner. Another novel finding is hepatic induction of CYP3a13 by dexamethasone occurring only in pregnane X receptor null mice. We also report that pregnane X receptor is essential to maintain robust in vivo basal levels of CYP3a13 in contrast to CYP3a11. CYP3a13 protein expressed in vitro can metabolize clinically active drugs ethylmorphine and erythromycin, as well as benzphetamine. We conclude that CYP3a13 is regulated differentially by various nuclear receptors. In humans this may lead to altered drug metabolism, as many of the newly synthesized ligands/drugs targeted toward these nuclear receptors could influence CYP3A gene expression.
- Subjects :
- Male
Receptors, Steroid
Receptors, Retinoic Acid
Receptors, Cytoplasmic and Nuclear
Biology
Ligands
Models, Biological
Biochemistry
Dexamethasone
Xenobiotics
Mice
Liver X receptor beta
Constitutive androstane receptor
Genetics
Animals
Cytochrome P-450 CYP3A
Tissue Distribution
Molecular Biology
Nuclear receptor co-repressor 1
Mice, Knockout
Sex Characteristics
Pregnane X receptor
Retinoid X receptor alpha
Pregnane X Receptor
Membrane Proteins
Liver X receptor alpha
Oxidoreductases, N-Demethylating
Genomics
Retinoid X receptor gamma
Molecular biology
Recombinant Proteins
Mice, Inbred C57BL
Gene Components
Retinoid X Receptors
Gene Expression Regulation
Female
Aryl Hydrocarbon Hydroxylases
Retinoid X receptor beta
Transcription Factors
Biotechnology
Subjects
Details
- ISSN :
- 15306860 and 08926638
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- The FASEB Journal
- Accession number :
- edsair.doi.dedup.....8e4128621ef8be2884b778574ffddd01