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Inhibition of Small Maf Function in Pancreatic β-Cells Improves Glucose Tolerance Through the Enhancement of Insulin Gene Transcription and Insulin Secretion

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/60275

Title: Inhibition of Small Maf Function in Pancreatic β-Cells Improves Glucose Tolerance Through the Enhancement of Insulin Gene Transcription and Insulin Secretion
Authors: Nomoto, Hiroshi Browse this author
Kondo, Takuma Browse this author
Miyoshi, Hideaki Browse this author →KAKEN DB
Nakamura, Akinobu Browse this author →KAKEN DB
Hida, Yoko Browse this author
Yamashita, Ken-ichiro Browse this author
Sharma, Arun J. Browse this author
Atsumi, Tatsuya Browse this author →KAKEN DB
Issue Date: Oct-2015
Publisher: Endocrine Society
Journal Title: Endocrinology
Volume: 156
Issue: 10
Start Page: 3570
End Page: 3580
Publisher DOI: 10.1210/en.2014-1906
Abstract: The large-Maf transcription factor v-maf musculoaponeurotic fibrosarcoma oncogene homolog A (MafA) has been found to be crucial for insulin transcription and synthesis and for pancreatic beta-cell function and maturation. However, insights about the effects of small Maf factors on beta-cells are limited. Our goal was to elucidate the function of small-Maf factors on beta-cells using an animal model of endogenous small-Maf dysfunction. Transgenic (Tg) mice with beta-cell-specific expression of dominant-negative MafK (DN-MafK) experiments, which can suppress the function of all endogenous small-Mafs, were fed a high-fat diet, and their in vivo phenotypes were evaluated. Phenotypic analysis, glucose tolerance tests, morphologic examination of beta-cells, and islet experiments were performed. DN-MafK-expressed MIN6 cells were also used for in vitro analysis. The results showed that DN-MafK expression inhibited endogenous small-Maf binding to insulin promoter while increasing MafA binding. DN-MafK Tg mice under high-fat diet conditions showed improved glucose metabolism compared with control mice via incremental insulin secretion, without causing changes in insulin sensitivity or MafA expression. Moreover, up-regulation of insulin and glucokinase gene expression was observed both in vivo and in vitro under DN-MafK expression. We concluded that endogenous small-Maf factors negatively regulates beta-cell function by competing for MafA binding, and thus, the inhibition of small-Maf activity can improve beta-cell function.
Type: article (author version)
URI: http://hdl.handle.net/2115/60275
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渥美 達也

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