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Research ArticleArticle

Regulation of Human 3α-Hydroxysteroid Dehydrogenase (AKR1C4) Expression by the Liver X Receptor α

Keith R. Stayrook, Pamela M. Rogers, Rajesh S. Savkur, Yongjun Wang, Chen Su, Gabor Varga, Xin Bu, Tao Wei, Sunil Nagpal, Xiaole Shirley Liu and Thomas P. Burris
Molecular Pharmacology February 2008, 73 (2) 607-612; DOI: https://doi.org/10.1124/mol.107.039099
Keith R. Stayrook
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Pamela M. Rogers
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Rajesh S. Savkur
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Yongjun Wang
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Chen Su
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Gabor Varga
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Xin Bu
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Tao Wei
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Sunil Nagpal
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Xiaole Shirley Liu
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Thomas P. Burris
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Abstract

Type I human hepatic 3α-hydroxysteroid dehydrogenase (AKR1C4) plays a significant role in bile acid biosynthesis, steroid hormone metabolism, and xenobiotic metabolism. Utilization of a hidden Markov model for predictive modeling of nuclear hormone receptor response elements coupled with chromatin immunoprecipitation/microarray technology revealed a putative binding site in the AKR1C4 promoter for the nuclear hormone receptor known as liver X receptor α, (LXRα [NR1H3]), which is the physiological receptor for oxidized cholesterol metabolites. The putative LXRα response element (LXRE), identified by chromatin immunoprecipitation, was ∼1.5 kilobase pairs upstream of the transcription start site. LXRα was shown to bind specifically to this LXRE and mediate transcriptional activation of the AKR1C4 gene, leading to increased AKR1C4 protein expression. These data suggest that LXRα may modulate the bile acid biosynthetic pathway at a unique site downstream of CYP7A1 and may also modulate the metabolism of steroid hormones and certain xenobiotics.

Footnotes

  • ABBREVIATIONS: HSD, hydroxysteroid dehydrogenase; AKR, aldo-keto reductase; LXR, liver X receptor; LXRE, liver X receptor response element; T0901317, N-[4-(1,1,1,3,3,3-hexafluoro-2-hydroxypropan-2-yl)phenyl]-N-(2,2,2-trifluoroethyl)benzenesulfonamide; DMSO, dimethyl sulfoxide; PCR, polymerase chain reaction; EMSA, electrophoretic mobility shift assay; RXR, retinoid X receptor; ChIP, chromatin immunoprecipitation; BAP, bacterial alkaline phosphatase; bp, base pair(s); T1317, N-[4-(1,1,1,3,3,3,-hexafluoro-2-hydroxypropan-2-yl)phenyl]-N-(2,2,2-trifluoromethyl)benzene sulfonamide; siRNA, small interfering RNA; HMM, hidden Markov model.

  • ↵1 Current affiliation: PTC Therapeutics, South Plainfield, New Jersey.

  • ↵2 Current affiliation: Wyeth Research, 500 Arcola Rd, Collegeville, Pennsylvania. 19426

    • Received June 15, 2007.
    • Accepted November 15, 2007.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 73 (2)
Molecular Pharmacology
Vol. 73, Issue 2
1 Feb 2008
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Research ArticleArticle

Regulation of Human 3α-Hydroxysteroid Dehydrogenase (AKR1C4) Expression by the Liver X Receptor α

Keith R. Stayrook, Pamela M. Rogers, Rajesh S. Savkur, Yongjun Wang, Chen Su, Gabor Varga, Xin Bu, Tao Wei, Sunil Nagpal, Xiaole Shirley Liu and Thomas P. Burris
Molecular Pharmacology February 1, 2008, 73 (2) 607-612; DOI: https://doi.org/10.1124/mol.107.039099

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Research ArticleArticle

Regulation of Human 3α-Hydroxysteroid Dehydrogenase (AKR1C4) Expression by the Liver X Receptor α

Keith R. Stayrook, Pamela M. Rogers, Rajesh S. Savkur, Yongjun Wang, Chen Su, Gabor Varga, Xin Bu, Tao Wei, Sunil Nagpal, Xiaole Shirley Liu and Thomas P. Burris
Molecular Pharmacology February 1, 2008, 73 (2) 607-612; DOI: https://doi.org/10.1124/mol.107.039099
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