Endocrine Journal
Online ISSN : 1348-4540
Print ISSN : 0918-8959
ISSN-L : 0918-8959
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PDX-1 and MafA Play a Crucial Role in Pancreatic β-Cell Differentiation and Maintenance of Mature β-Cell Function
Hideaki KANETOTakeshi MIYATSUKADan KAWAMORIKaoru YAMAMOTOKen KATOToshihiko SHIRAIWANaoto KATAKAMIYoshimitsu YAMASAKIMunehide MATSUHISATaka-aki MATSUOKA
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2008 Volume 55 Issue 2 Pages 235-252

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Abstract

Pancreatic and duodenal homeobox factor-1 (PDX-1) plays a crucial role in pancreas development, β-cell differentiation, and maintenance of mature β-cell function. PDX-1 expression is maintained in pancreatic precursor cells during pancreas development but becomes restricted to β-cells in mature pancreas. In mature β-cells, PDX-1 transactivates the insulin and other genes involved in glucose sensing and metabolism such as GLUT2 and glucokinase. MafA is a recently isolated β-cell-specific transcription factor which functions as a potent activator of insulin gene transcription. Furthermore, these transcription factors play an important role in induction of insulin-producing cells in various non-β-cells and thus could be therapeutic targets for diabetes. On the other hand, under diabetic conditions, expression and/or activities of PDX-1 and MafA in β-cells are reduced, which leads to suppression of insulin biosynthesis and secretion. It is likely that alteration of such transcription factors explains, at least in part, the molecular mechanism for β-cell glucose toxicity found in diabetes.

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© The Japan Endocrine Society
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