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Members of the C/EBP family of basic-leucine zipper (bZip) transcription factors form heterodimers and bind to the CAAT box and other sequence-related enhancer motifs. Using a 32P-labeled protein probe consisting of the bZip domain of C/EBP beta, we isolated a clone encoding C/EBP-related ATF (C/ATF), a bZip protein that heterodimerizes with C/EBP-like(More)
AIMS/HYPOTHESIS Homeodomain transcription factors play an important role in the regulation of pancreatic islet function. In previous studies we determined that aristaless-like homeobox 3 (ALX3) is produced in islet cells, binds to the promoter of the insulin gene and regulates its expression. The purpose of the present study was to investigate the(More)
The endocrine cells of the rat pancreatic islets of Langerhans, including insulin-producing beta-cells, turn over every 40-50 days by processes of apoptosis and the proliferation and differentiation of new islet cells (neogenesis) from progenitor epithelial cells located in the pancreatic ducts. However, the administration to rats of islet trophic factors(More)
The expression of the genes encoding the hormones glucagon, insulin, somatostatin, and pancreatic polypeptide in the endocrine islets of the pancreas is regulated in a cell-specific manner, defining four distinct cellular phenotypes (A-, B-, D-, and F-cells, respectively). Binding of nuclear proteins to cognate DNA sequences within cis-acting regulatory(More)
Hox-like homeodomain proteins play a critical role during embryonic development by regulating the transcription of genes that are important for the generation of specific organs or cell types. The homeodomain transcription factor IDX1/IPF1, the expression of which was thought until recently to be restricted to the pancreas and foregut, is required for(More)
Expression of the homeodomain transcription factor IDX1/IPF1 has been shown to be restricted to cells in the developing foregut that form the pancreatic primordium. In the adult, IDX1/IPF1 is expressed in the duodenum and pancreatic islets. The IDX1/IPF1 gene is required for pancreatic development, and in the human, heterozygous mutations have been linked(More)
The transcription factor CHOP (C/EBP homologous protein 10) is a bZIP protein induced by a variety of stimuli that evoke cellular stress responses and has been shown to arrest cell growth and to promote programmed cell death. CHOP cannot form homodimers but forms stable heterodimers with the C/EBP family of activating transcription factors. Although(More)
Arginine-vasopressin (AVP) and related peptides were administered by microinjection into the nucleus tractus solitarius of the rat. AVP produced a rise both in mean arterial pressure and in heart rate. This effect was abolished by pretreatment with a specific antagonist of V1 receptors and was not seen either after injections of oxytocin or of the V2(More)
Transcription factor CREB regulates cyclic AMP (cAMP)-dependent gene expression by binding to and activating transcription from cAMP response elements (CREs) in the promoters of target genes. The transcriptional transactivation functions of CREB are activated by its phosphorylation by cAMP-dependent protein kinase A (PKA). In studies of many different(More)