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• W1997304347 abstract "The hexosamine biosynthesis pathway (HBP) regulates the post-translational modification of nuclear and cytoplasmic protein by O-linked N-acetylglucosamine (O-GlcNAc). Numerous studies have demonstrated increased flux through this pathway contributes to the development of β-cell dysfunction. The effect of decreased O-GlcNAc on the maintenance of normal β-cell function, however, is not well understood. We studied transgenic mice that over express β-N-acetylglucosaminidase (O-GlcNAcase), an enzyme that catalyzes the removal of O-GlcNAc from proteins, in the pancreatic β-cell under control of the rat insulin promoter. 3-4-Month-old O-GlcNAcase transgenic mice have higher glucose excursions with a concomitant decrease in circulating insulin levels, insulin mRNA levels, and total islet insulin content. In older (8-9-month-old) O-GlcNAcase transgenic mice glucose tolerance is no longer impaired. This is associated with increased serum insulin, islet insulin content, and insulin mRNA in the O-GlcNAcase transgenic mice. These improvements in β-cell function with aging are associated with increased angiogenesis and increased VEGF expression, with parallel increases in activation of Akt and expression of PGC1α. The biphasic effects as a function of age are consistent with published observations of mice with increased O-GlcNAc in islets and demonstrate that O-GlcNAc signaling exerts multiple effects on both insulin secretion and islet survival." @default.
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• W1997304347 date "2011-07-01" @default.
• W1997304347 modified "2023-10-14" @default.
• W1997304347 title "Pleiotropic and Age-dependent Effects of Decreased Protein Modification by O-Linked N-Acetylglucosamine on Pancreatic β-Cell Function and Vascularization" @default.
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• W1997304347 doi "https://doi.org/10.1074/jbc.m111.249508" @default.
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