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Molecular Pharmacology

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Research ArticleArticle

Transcriptional Regulation of the Human CYP3A4Gene by the Constitutive Androstane Receptor

Bryan Goodwin, Ecushla Hodgson, Daniel J. D'Costa, Graham R. Robertson and Christopher Liddle
Molecular Pharmacology August 2002, 62 (2) 359-365; DOI: https://doi.org/10.1124/mol.62.2.359
Bryan Goodwin
Department of Clinical Pharmacology and Storr Liver Unit, University of Sydney, Westmead Millennium Institute, Westmead, New South Wales, Australia
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Ecushla Hodgson
Department of Clinical Pharmacology and Storr Liver Unit, University of Sydney, Westmead Millennium Institute, Westmead, New South Wales, Australia
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Daniel J. D'Costa
Department of Clinical Pharmacology and Storr Liver Unit, University of Sydney, Westmead Millennium Institute, Westmead, New South Wales, Australia
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Graham R. Robertson
Department of Clinical Pharmacology and Storr Liver Unit, University of Sydney, Westmead Millennium Institute, Westmead, New South Wales, Australia
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Christopher Liddle
Department of Clinical Pharmacology and Storr Liver Unit, University of Sydney, Westmead Millennium Institute, Westmead, New South Wales, Australia
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Abstract

Cytochrome P450 3A4 (CYP3A4), the predominant P450 expressed in adult human liver, is both constitutively expressed and transcriptionally activated by a variety of structurally diverse xenochemicals. In this study, we examined the role of the constitutive androstane receptor (CAR), a member of the steroid/retinoid/thyroid hormone receptor superfamily, in the transcriptional regulation of CYP3A4. Herein, we demonstrate that CAR is capable oftrans-activating expression of the CYP3A4gene, both in vitro and in vivo. Induction of CYP3A4 is dependent on cooperativity between elements within the promoter proximal region of the gene and the distal xenobiotic-responsive enhancer module. CAR responsiveness was shown to be primarily mediated by two high-affinity binding motifs located within theCYP3A4 gene 5′-flanking region, approximately 7720 and 150 bases upstream of the transcription initiation site. Importantly, the human CAR response elements also mediatetrans-activation of CYP3A4 by the human pregnane X receptor, suggesting that interplay between these receptors is likely to be an important determinant of CYP3A4expression.

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Molecular Pharmacology: 62 (2)
Molecular Pharmacology
Vol. 62, Issue 2
1 Aug 2002
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Research ArticleArticle

Transcriptional Regulation of the Human CYP3A4Gene by the Constitutive Androstane Receptor

Bryan Goodwin, Ecushla Hodgson, Daniel J. D'Costa, Graham R. Robertson and Christopher Liddle
Molecular Pharmacology August 1, 2002, 62 (2) 359-365; DOI: https://doi.org/10.1124/mol.62.2.359

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Research ArticleArticle

Transcriptional Regulation of the Human CYP3A4Gene by the Constitutive Androstane Receptor

Bryan Goodwin, Ecushla Hodgson, Daniel J. D'Costa, Graham R. Robertson and Christopher Liddle
Molecular Pharmacology August 1, 2002, 62 (2) 359-365; DOI: https://doi.org/10.1124/mol.62.2.359
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