PDX-1 and MafA Play a Crucial Role in Pancreatic β-Cell Differentiation and Maintenance of Mature β-Cell Function

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 panc...

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Veröffentlicht in:Endocrine Journal 2008, Vol.55(2), pp.235-252
Hauptverfasser: KANETO, Hideaki, MIYATSUKA, Takeshi, KAWAMORI, Dan, YAMAMOTO, Kaoru, KATO, Ken, SHIRAIWA, Toshihiko, KATAKAMI, Naoto, YAMASAKI, Yoshimitsu, MATSUHISA, Munehide, MATSUOKA, Taka-aki
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container_end_page 252
container_issue 2
container_start_page 235
container_title Endocrine Journal
container_volume 55
creator KANETO, Hideaki
MIYATSUKA, Takeshi
KAWAMORI, Dan
YAMAMOTO, Kaoru
KATO, Ken
SHIRAIWA, Toshihiko
KATAKAMI, Naoto
YAMASAKI, Yoshimitsu
MATSUHISA, Munehide
MATSUOKA, Taka-aki
description 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.
doi_str_mv 10.1507/endocrj.K07E-041
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source MEDLINE; J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese; EZB-FREE-00999 freely available EZB journals
subjects Animals
Cell Differentiation - physiology
Diabetes Mellitus, Type 2 - etiology
Diabetes Mellitus, Type 2 - metabolism
Diabetes Mellitus, Type 2 - physiopathology
Disease Models, Animal
Glucose - metabolism
Homeodomain Proteins - physiology
Humans
Insulin - metabolism
Insulin-Secreting Cells - cytology
Insulin-Secreting Cells - physiology
Maf Transcription Factors, Large - physiology
MafA
Mice
Pancreas development
PDX-1
Rats
Trans-Activators - physiology
β-cell differentiation
β-cell glucose toxicity
title PDX-1 and MafA Play a Crucial Role in Pancreatic β-Cell Differentiation and Maintenance of Mature β-Cell Function
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