title: The islet beta cell-enriched RIPE3b1/Maf transcription factor regulates pdx-1 expression.
abstract: Pancreatic duodenal homeobox factor-1, PDX-1, is required for pancreas development, islet cell differentiation, and the maintenance of beta cell function. Selective expression in the pancreas appears to be principally regulated by Area II, one of four conserved regulatory sequence domains found within the 5'-flanking region of the pdx-1 gene. Detailed mutagenesis studies have identified potential sites of interaction for both positive- and negative-acting factors within the conserved sequence blocks of Area II. The islet beta cell-enriched RIPE3b1 transcription factor, the activator of insulin C1 element-driven expression, was shown here to also stimulate Area II by binding to sequence blocks 4 and 5 (termed B4/5). Accordingly, B4/5 DNA-binding protein's molecular mass (i.e. 46 kDa), binding specificity, and islet beta cell-enriched distribution were identical to RIPE3b1. Area II-mediated activation was also unaffected upon replacing B4/5 with the insulin C1/RIPE3b1 binding site. In addition, the chromatin immunoprecipitation assay showed that the Area II region of the endogenous pdx-1 gene was precipitated by an antiserum that recognizes the large Maf protein that comprises the RIPE3b1 transcription factor. These results strongly suggest that RIPE3b1/Maf has an important role in generating and maintaining physiologically functional beta cells.
authors.affiliation: Department of Molecular Physiology and Biophysics, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA.
authors.forename: Susan E
authors.initials: SE
authors.lastname: Samaras
authors.forename: Li
authors.initials: L
authors.lastname: Zhao
authors.forename: Anna
authors.initials: A
authors.lastname: Means
authors.forename: Eva
authors.initials: E
authors.lastname: Henderson
authors.forename: Taka-Aki
authors.initials: TA
authors.lastname: Matsuoka
authors.forename: Roland
authors.initials: R
authors.lastname: Stein
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D006224:Cricetinae; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D018507:Gene Expression Regulation, Developmental; D018398:Homeodomain Proteins; D007515:Islets of Langerhans / Q000166:cytology / Q000196:embryology / Q000502:physiology*; D007668:Kidney / Q000166:cytology; D051379:Mice; D016296:Mutagenesis; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D051257:Proto-Oncogene Proteins c-maf; D015534:Trans-Activators / Q000235:genetics* / Q000378:metabolism*; D014158:Transcription, Genetic / Q000502:physiology
chemical_list: D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; C495608:Maf protein, mouse; D011518:Proto-Oncogene Proteins; D051257:Proto-Oncogene Proteins c-maf; D015534:Trans-Activators; C084010:pancreatic and duodenal homeobox 1 protein