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Research ArticleArticle

Regulation of Flavin-Containing Monooxygenase 1 Expression by Ying Yang 1 and Hepatic Nuclear Factors 1 and 4

Zhaohui Luo and Ronald N. Hines
Molecular Pharmacology December 2001, 60 (6) 1421-1430; DOI: https://doi.org/10.1124/mol.60.6.1421
Zhaohui Luo
Departments of Pediatrics and Pharmacology and Toxicology, Birth Defects Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin
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Ronald N. Hines
Departments of Pediatrics and Pharmacology and Toxicology, Birth Defects Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin
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Abstract

The flavin-containing monooxygenases (FMOs) are important for the oxidation of a variety of environmental toxicants, natural products, and therapeutics. Consisting of six family members (FMO1–5), these enzymes exhibit distinct but broad and overlapping substrate specificity and are expressed in a highly tissue- and species-selective manner. Corresponding to previously identified regulatory domains, a YY1 binding site was identified at the major rabbit FMO1promoter, position −8 to −2, two overlapping HNF1α sites, position −132 to −105, and two HNF4α sites, position −467 to −454 and −195 to −182. Cotransfection studies with HNF1α and HNF4α expression vectors demonstrated a major role for each of these factors in enhancing FMO1 promoter activity. In contrast, YY1 was shown by site-directed mutagenesis to be dispensable for basal promoter activity but suppressed the ability of the upstream domains to enhance transcription. Finally, comparisons between rabbit and humanFMO1 demonstrated conservation of each of these regulatory elements. With the exception of the most distal HNF4α site, each of the orthologous human sequences also was able to compete with rabbit FMO1 cis-elements for specific protein binding. These data are consistent with these same elements being important for regulating human FMO1 developmental- and tissue-specific expression.

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Molecular Pharmacology: 60 (6)
Molecular Pharmacology
Vol. 60, Issue 6
1 Dec 2001
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Research ArticleArticle

Regulation of Flavin-Containing Monooxygenase 1 Expression by Ying Yang 1 and Hepatic Nuclear Factors 1 and 4

Zhaohui Luo and Ronald N. Hines
Molecular Pharmacology December 1, 2001, 60 (6) 1421-1430; DOI: https://doi.org/10.1124/mol.60.6.1421

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Research ArticleArticle

Regulation of Flavin-Containing Monooxygenase 1 Expression by Ying Yang 1 and Hepatic Nuclear Factors 1 and 4

Zhaohui Luo and Ronald N. Hines
Molecular Pharmacology December 1, 2001, 60 (6) 1421-1430; DOI: https://doi.org/10.1124/mol.60.6.1421
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