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Transcriptional Regulation of Dehydroepiandrosterone Sulfotransferase (SULT2A1) by Estrogen-Related Receptor

Division of Reproductive Endocrinology and Infertility (J.S., K.S.A., B.M., B.R.C., W.E.R.), University of Texas Southwestern Medical Center, Dallas, Texas 75390; McGill University Health Center (V.G., J.L.), Montreal, Quebec, Canada H3A 2B4; Tohoku University School of Medicine (T.S., H.S.), Department of Pathology, Sendai 980-8575, Japan

Address all correspondence and requests for reprints to: William E. Rainey, PhD, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9032. E-mail: william.rainey{at}utsouthwestern.edu.

The estrogen-related receptors (ERR, -ß, and -) are a subfamily of orphan nuclear receptors (designated NR3B1, NR3B2, and NR3B3) that are structurally and functionally related to estrogen receptors and ß. Herein we test the hypothesis that ERR regulates transcription of the genes encoding the enzymes involved in adrenal steroid production. Real-time RT-PCR was first used to determine the levels of ERR mRNA in various human tissues. Adult adrenal levels of ERR transcript were similar to that seen in heart, which is known to highly express ERR. Expression of ERR in the adult adrenal was then confirmed using Western blotting and immunohistochemistry. To examine the effects of ERR on steroidogenic capacity we used reporter constructs with the 5'-flanking regions of steroidogenic acute regulatory protein (StAR), cholesterol side-chain cleavage (CYP11A), 3ß-hydroxysteroid dehydrogenase type II (HSD3B2), 17-hydroxylase/17,20-lyase (CYP17), and dehydroepiandrosterone sulfotransferase (SULT2A1). Cotransfection of these reporter constructs with wild-type ERR or VP16-ERR expression vectors demonstrated ERR enhanced reporter activity driven by flanking DNA from CYP17 and SULT2A1. SULT2A1 promoter activity was most responsive to the ERR and VP16-ERR, increasing activity 2.6- and 79.5-fold, respectively. ERR effects on SULT2A1 were greater than the stimulation seen in response to steroidogenic factor 1 (SF1). Transfection of serial deletions of the 5'-flanking DNA of the SULT2A1 gene and EMSA experiments indicated the presence of three functional regulatory cis-elements which shared sequence similarity to binding sites for SF1. Taken together, the expression of ERR in the adrenal and its regulation of SULT2A1 suggest an important role for this orphan receptor in the regulation of adrenal steroid production.

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