Abstract
ZBP-89 (ZNF148) is a Zinc finger Binding Protein of 89 kDa that binds GC-rich DNA elements. Originally, it was expression cloned using a DNA element mediating EGF regulation of the gastrin promoter. ZBP-89 functions as both a transcriptional activator and repressor. A variety of extracellular regulators including TGFβ, retinoic acid and butyrate stimulate ZBP-89 gene expression. Butyrate activation of p21WAF1 is potentiated by ZBP-89 gene expression correlating with cell differentiation. ZBP-89 stimulates growth arrest and apoptosis through its ability to bind the p21WAF1 promoter or its ability to form protein-protein interactions with p53. ZBP-89 protein is elevated in a variety of gastrointestinal cancers as well as the pancreas. In particular, ZBP-89 is normally expressed in pancreatic islets and ducts and in about 30% of pancreatic adenocarcinomas.
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