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Submitted on February 25, 2004
Accepted on December 9, 2004
Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9032, USA
* To whom correspondence should be addressed. E-mail: GAttia{at}med.miami.edu.
Following ovulation, there is a shift in ovarian steroidogenesis from an estrogen producing ovarian follicle to a progesterone producing corpus luteum. The first step in human ovarian steroidogenesis is catalyzed by cholesterol side chain cleavage cytochrome P450 (CYP11A1) enzyme. Steroidogenic factor-1 (SF-1) is an orphan nuclear receptor that regulates several steroidogenic enzymes, including CYP11A1. Liver receptor homolog-1 (LRH-1) is another orphan nuclear receptor that is expressed in the human ovary. Following ovulation there is a down-regulation in SF-1, which is associated with an up-regulation of LRH-1 expression. These changes coincide with increased level of CYP11A1 expression in human corpus luteum. In this study, we examined the role of LRH-1 in the regulation of human granulosa cell CYP11A1 expression. Co-transfection of human granulosa cell tumor cells with CYP11A1 promoter and LRH-1 expression vector resulted in a significant increase in CYP11A1 expression. Deletion analysis revealed two putative LRH-1 binding sites at -1580 and -40, which was confirmed by EMSA. DAX-1 inhibited LRH-1 stimulated CYP11A1 expression and that was not overcome by the presence of PKA agonist. We conclude that CYP11A1 expression in human granulosa cells is regulated by LRH-1. We propose that LRH-1 could be the major transcription factor for the post-ovulatory surge in human ovarian steroidogenesis.
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