title: LRH-1/NR5A2 cooperates with GATA factors to regulate inhibin alpha-subunit promoter activity.
abstract: Inhibin alpha is the common subunit of the dimeric inhibin proteins known for their role in suppressing pituitary FSH secretion. In this study, we have examined the role of GATA factors and the nuclear receptor, LRH-1/NR5A2, in the regulation of inhibin alpha-subunit promoter activity. The inhibin alpha promoter contains two GATA-binding motifs that can be activated by GATA4 or GATA6. The GATA-dependence of the promoter was demonstrated by downregulating GATA expression in MA-10 cells using siRNA technology. We next examined whether GATA factors could cooperate with LRH-1, a factor recently proposed to be an important regulator of inhibin alpha-subunit transcription. Both GATA4 and GATA6 strongly synergized with LRH-1. Consistent with the cAMP-dependence of the inhibin alpha-subunit promoter, GATA/LRH-1 synergism was markedly enhanced by PKA and the co-activator protein CBP. Thus, our results identify LRH-1 as a new transcriptional partner for GATA factors in the regulation of inhibin alpha-subunit gene expression.
authors.affiliation: Ontogeny-Reproduction Research Unit, CHUL Research Centre (CHUQ), Québec City, Que, Canada.
authors.forename: Nicholas M
authors.initials: NM
authors.lastname: Robert
authors.forename: Yoko
authors.initials: Y
authors.lastname: Miyamoto
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Taniguchi
authors.forename: Robert S
authors.initials: RS
authors.lastname: Viger
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D002478:Cells, Cultured; D002522:Chlorocebus aethiops; D017868:Cyclic AMP-Dependent Protein Kinases / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000378:metabolism; D050980:GATA Transcription Factors / Q000378:metabolism*; D050991:GATA4 Transcription Factor / Q000378:metabolism; D050993:GATA6 Transcription Factor / Q000378:metabolism; D017930:Genes, Reporter; D007265:Inhibins / Q000235:genetics*; D008565:Membrane Proteins / Q000494:pharmacology; D051379:Mice; D008969:Molecular Sequence Data; D010750:Phosphoproteins / Q000494:pharmacology; D011401:Promoter Regions, Genetic; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism*; D012689:Sequence Homology, Nucleic Acid; D015533:Transcriptional Activation; D014162:Transfection
chemical_list: D004268:DNA-Binding Proteins; D050980:GATA Transcription Factors; D050991:GATA4 Transcription Factor; D050993:GATA6 Transcription Factor; D008565:Membrane Proteins; C431936:Nr5a2 protein, mouse; C498709:Pag1 protein, mouse; D010750:Phosphoproteins; D018160:Receptors, Cytoplasmic and Nuclear; C094377:inhibin-alpha subunit; D007265:Inhibins; D017868:Cyclic AMP-Dependent Protein Kinases