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Estrogen Stimulates Estrogen-Related Receptor Gene Expression through Conserved Hormone Response Elements

Gene Regulation Section, Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709

Address all correspondence and requests for reprints to: Christina T. Teng, 111 Alexander Drive, P.O. Box 12233, MD E201, Research Triangle Park, North Carolina 27709. E-mail: Teng{at}niehs.nih.gov.

The estrogen-related receptor gene encodes a nuclear receptor protein, ERR, whose structure is closely related to the estrogen receptors. ERR modulates estrogen receptor (ER)-mediated signaling pathways both positively and negatively. It is selectively expressed in a variety of cell types during development and in adult tissues. We have previously shown that estrogen stimulates the expression of the ERR gene in mouse uterus. In this study, we found that the ERR gene is stimulated by estrogen in mouse uterus and heart but not in liver. Estrogen also stimulates the expression of ERR in the human breast and endometrial cell lines. The human ERR gene promoter contains multiple Sp1 binding sites, and the Sp1 protein is required for the promoter activity. The major estrogen response is mediated by a 34-bp DNA element that contains multiple steroid hormone response element half-sites (MHREs) that are conserved between the human and mouse ERR gene promoters. Mutations made at a single or multiple sites of the MHREs abolished the ER-mediated transcription of the element in transient transfection experiments. By chromatin immunoprecipitation assay, we demonstrated the interaction between ER and MHREs of the endogenous ERR gene promoter in MCF-7 cells. Estrogen treatment further enhanced the association of ER and MHREs in vivo. The present study demonstrated that the ERR gene is a downstream target of ER.

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