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1 June 2002 Orphan Receptor Chicken Ovalbumin Upstream Promoter Transcription Factors Inhibit Steroid Factor-1, Upstream Stimulatory Factor, and Activator Protein-1 Activation of Ovine Follicle-Stimulating Hormone Receptor Expression via Composite cis-Elements
Weirong Xing, Natalia Danilovich, M. Ram Sairam
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Abstract

The FSH receptor (FSHR) is selectively expressed in the granulosa and Sertoli cells in a development-dependent manner. Little is known regarding how the regulatory factors balance expression of this gene in ovarian cycles or spermatogenic stages. We have used the ovine FSHR promoter as a model system and identified a third regulatory element (RE-3) located at −197 to −171 of the strongest promoter. Gel mobility shift and antibody supershift assays demonstrated that nuclear factors c-Fos/c-Jun, steroidogenic factor-1 (SF-1), upstream stimulatory factor-1/2 (USF-1/2), and chicken ovalbumin upstream promoter transcription factor-1/2 (COUP-TFI/II) potentially bound to RE-3. We have also extended our previous observations by showing that a sequence containing an E-box was not only bound by USF proteins but also recognized by COUP-TF orphan receptors. Functional studies demonstrated that USF-1/2, c-Fos/c-Jun, and SF-1 were activators, whereas COUP-TFs were repressors. Our studies indicated that RE-3 mediated SF-1 activation as well as phorbol 12-myristate 13-acetate stimulation, whereas COUP-TFs inhibited AP-1, USFs, and SF-1 activation. We also demonstrated that both COUP-TF-binding sites in the core promoter were required for the bipartite elements to oppose their competitor binding. These data suggest a mechanism by which positive and negative regulators compete for the common regulatory elements, providing antagonistic pathways that might govern the expression of FSHR in gonadal cells.

Weirong Xing, Natalia Danilovich, and M. Ram Sairam "Orphan Receptor Chicken Ovalbumin Upstream Promoter Transcription Factors Inhibit Steroid Factor-1, Upstream Stimulatory Factor, and Activator Protein-1 Activation of Ovine Follicle-Stimulating Hormone Receptor Expression via Composite cis-Elements," Biology of Reproduction 66(6), 1656-1666, (1 June 2002). https://doi.org/10.1095/biolreprod66.6.1656
Received: 17 September 2001; Accepted: 1 December 2001; Published: 1 June 2002
KEYWORDS
follicle-stimulating hormone receptor
gene regulation
granulosa cells
ovary
Sertoli cells
steroid hormone receptors
testis
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