alexa Insulin gene is a target in activin receptor-like kinase 7 signaling pathway in pancreatic beta-cells.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Diabetes & Metabolism

Author(s): Watanabe R, Shen ZP, Tsuda K, Yamada Y

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Abstract Activins regulate pancreatic development, differentiation and insulin secretion. Activin receptor-like kinase 7 (ALK7) has been identified as a receptor for Nodal and Activin AB and B, and is expressed in pancreatic islets and beta-cell lines. In this study, human insulin promoter was activated by Smad2, Smad3 and the pancreatic and duodenal homeobox factor-1 (PDX-1) in the ALK7 pathway. A conserved Smad binding element was related to the promoter activation. Phosphorylated Smad2/Smad3 and PDX-1 were bound to insulin gene with Nodal and Activin AB, and the phosphorylated Smad2/Smad3 interacted with PDX-1. These results indicate that one of the direct target genes of Nodal and Activin AB signals is the insulin gene in pancreatic beta-cells and that PDX-1 is directly involved in the ALK7-Smad pathway. This article was published in Biochem Biophys Res Commun and referenced in Journal of Diabetes & Metabolism

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