title: Transcriptional cooperation between NF-kappaB p50 and CCAAT/enhancer binding protein beta regulates Nur77 transcription in Leydig cells.
abstract: Expression of steroidogenic enzyme-encoding genes in testicular Leydig cells is complex and involves several transcription factors including the orphan nuclear receptor NUR77 (NR4A1) and the bZIP factor CCAAT/enhancer binding protein beta (EBPbeta). How these transcription factors are integrated into a functional network, however, remains to be fully understood. Here, we report that the transcription factor C/EBPbeta can activate the Nur77 promoter as revealed by transient transfections in MA-10 Leydig cells. Through 5' progressive deletions and site-directed mutagenesis, the C/EBPbeta-mediated activation of the Nur77 promoter was found to be dependent on a novel species-conserved C/EBP element located at -110 bp. We also demonstrate using electromobility shift assay that C/EBPbeta specifically binds to this element. Furthermore, we report a functional cooperation between C/EBPbeta and the p50 subunit of NF-kappaB that involves a previously uncharacterized kappaB element located at -18 bp. Promoter analysis revealed that either the C/EBP or the kappaB element was sufficient to sustain the C/EBPbeta-p50 cooperation thus suggesting that both factors physically interact. Altogether, our results provide new data regarding Nur77 transcription in testicular Leydig cells in addition to providing new insights into the interplay between transcription factors involved in Leydig cell gene expression and function.
authors.affiliation: Reproduction, Perinatal and Child Health, CHUQ Research Centre, CHUL Room T1-49, 2705 Laurier Boulevard, Quebec City, Quebec, Canada G1V 4G2.
authors.forename: Bassam
authors.initials: B
authors.lastname: El-Asmar
authors.forename: Xavier C
authors.initials: XC
authors.lastname: Giner
authors.forename: Jacques J
authors.initials: JJ
authors.lastname: Tremblay
mesh_terms: D000818:Animals; D020029:Base Pairing / Q000235:genetics; D001483:Base Sequence; D022782:CCAAT-Enhancer-Binding Protein-beta / Q000378:metabolism*; D017124:Conserved Sequence; D004268:DNA-Binding Proteins / Q000235:genetics*; D024202:Electrophoretic Mobility Shift Assay; D007985:Leydig Cells / Q000378:metabolism*; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D052002:NF-kappa B p50 Subunit / Q000378:metabolism*; D057105:Nuclear Receptor Subfamily 4, Group A, Member 1; D011485:Protein Binding; D051381:Rats; D011987:Receptors, Steroid / Q000235:genetics*; D020218:Response Elements / Q000235:genetics; D014158:Transcription, Genetic
chemical_list: D022782:CCAAT-Enhancer-Binding Protein-beta; D004268:DNA-Binding Proteins; D052002:NF-kappa B p50 Subunit; C539818:Nr4a1 protein, mouse; C539820:Nr4a1 protein, rat; D057105:Nuclear Receptor Subfamily 4, Group A, Member 1; D011987:Receptors, Steroid