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Nat Genet. 2002 Oct;32(2):245-53. Epub 2002 Sep 3.

Regulation of insulin action and pancreatic beta-cell function by mutated alleles of the gene encoding forkhead transcription factor Foxo1.

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  • 1Naomi Berrie Diabetes Center, Berrie Research Pavilion, 1150 St. Nicholas Avenue, Department of Medicine, College of Physicians & Surgeons of Columbia University, New York, New York 10032, USA.

Abstract

Type 2 diabetes results from impaired action and secretion of insulin. It is not known whether the two defects share a common pathogenesis. We show that haploinsufficiency of the Foxo1 gene, encoding a forkhead transcription factor (forkhead box transcription factor O1), restores insulin sensitivity and rescues the diabetic phenotype in insulin-resistant mice by reducing hepatic expression of glucogenetic genes and increasing adipocyte expression of insulin-sensitizing genes. Conversely, a gain-of-function Foxo1 mutation targeted to liver and pancreatic beta-cells results in diabetes arising from a combination of increased hepatic glucose production and impaired beta-cell compensation due to decreased Pdx1 expression. These data indicate that Foxo1 is a negative regulator of insulin sensitivity in liver, adipocytes and pancreatic beta-cells. Impaired insulin signaling to Foxo1 provides a unifying mechanism for the common metabolic abnormalities of type 2 diabetes.NOTE: In the AOP version of this article, the name of the fourth author was misspelled as W K Cavanee rather than the correct spelling: W K Cavenee. This has been corrected in the full-text online version of the article. The name will appear correctly in the print version.

[PubMed - indexed for MEDLINE]
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