title: Association of the mSin3A-histone deacetylase 1/2 corepressor complex with the mouse steroidogenic acute regulatory protein gene.
abstract: Several factors have been identified in the transcriptional repression of the steroidogenic acute regulatory protein (StAR) gene promoter; yet, no associating corepressor complexes have been characterized for the mouse promoter in MA-10 mouse Leydig tumor cells. We now report that Sp3, CAGA element binding proteins, and a corepressor complex consisting of mSin3A, histone deacetylase (HDAC)1, and HDAC2 associates with a transcriptional repressor region within the mouse StAR promoter. 5'-Promoter deletion analysis localized the negative regulatory region between -180 and -150 bp upstream of the transcription start site, and mutations in both the CAGA and Sp binding elements were required to relieve the repression of basal StAR promoter activity. Protein-DNA binding analysis revealed Sp3 and specific CAGA element-binding protein(s) associated with the repressor region. Coimmunoprecipitation analysis identified the presence of the mSin3A, HDAC1, and HDAC2 corepressor complex in MA-10 cells. Furthermore, chromatin immunoprecipitation assays revealed Sp3, mSin3A, and HDAC1/2 association with the proximal region of the StAR promoter in situ. In addition, HDAC inhibition resulted in a dose-dependent activation of a mouse StAR reporter construct, whereas mutations within the repressor region diminished this effect by 44%. In sum, these data support a novel regulatory mechanism for transcriptional repression of the mouse StAR promoter by DNA binding of Sp3 and CAGA element-binding proteins, and association of the Sin3 corepressor complex exhibiting HDAC activity.
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Louisville School of Medicine, Louisville, Kentucky 40292, USA.
authors.forename: Brian F
authors.initials: BF
authors.lastname: Clem
authors.forename: Barbara J
authors.initials: BJ
authors.lastname: Clark
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D047369:Chromatin Immunoprecipitation; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D056284:Histone Deacetylase 1; D056464:Histone Deacetylase 2; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases / Q000378:metabolism*; D006877:Hydroxamic Acids / Q000494:pharmacology; D007984:Leydig Cell Tumor; D008297:Male; D051379:Mice; D009154:Mutation; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D012333:RNA, Messenger / Q000378:metabolism; D012097:Repressor Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D056264:Sin3 Histone Deacetylase and Corepressor Complex; D051705:Sp3 Transcription Factor / Q000378:metabolism; D014158:Transcription, Genetic; D000098682:Steroidogenic Acute Regulatory Protein
chemical_list: D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D010750:Phosphoproteins; D012333:RNA, Messenger; D012097:Repressor Proteins; C099683:SIN3A transcription factor; C497122:Sp3 protein, mouse; D000098682:Steroidogenic Acute Regulatory Protein; D051705:Sp3 Transcription Factor; C012589:trichostatin A; C484389:Hdac1 protein, mouse; C533424:Hdac2 protein, mouse; D056284:Histone Deacetylase 1; D056464:Histone Deacetylase 2; D006655:Histone Deacetylases; D056264:Sin3 Histone Deacetylase and Corepressor Complex