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- W2044788178 abstract "Alterations in glucose sensing are well-known in both humans and animal models of non-insulin-dependent diabetes mellitus. However, the circadian- and age-dependent expression of glucose-sensing genes has not previously been investigated in vivo. In the present paper, we show a progressive loss of beta-cell GLUT2-mRNA and, by immunocytochemistry, a gain of soluble, cytoplasmic GLUT2-protein in Goto-Kakizaki rat islets. We report that GLUT2-mRNA shows significant diurnal variation, which is stronger in metabolically healthy rats. We also demonstrate the significant diurnal variation of glucokinase-mRNA, with higher levels in the pancreas of 6-week-old Goto-Kakizaki rats than in Wistar rats. This leads to a maximum glucose phosphorylation capacity in-phase with food intake, enhanced glucose-stimulated insulin secretion, and prevents postprandial hyperglycemia. Perfusion experiments showed a reduction in glucose-stimulated insulin secretion in Goto-Kakizaki rat islets with an impaired first phase. Hyperglycemia and hypoinsulinemia in newborn and up to 3-week-old Goto-Kakizaki rats are thus probably due to reduced pancreatic beta-cell content, reduced beta-cell insulin content and impaired glucose sensing. The de-compensation of the metabolic situation in 42-week-old Goto-Kakizaki rats is likely to be caused by beta-cell destruction accompanied by negligible accumulation of GLUT2 in the cell membrane and further reduction of glucokinase expression." @default.
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- W2044788178 date "2007-08-01" @default.
- W2044788178 modified "2023-10-01" @default.
- W2044788178 title "Circadian and Age-dependent Expression Patterns of GLUT2 and Glucokinase in the Pancreatic β-Cell of Diabetic and Nondiabetic Rats" @default.
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- W2044788178 doi "https://doi.org/10.1055/s-2007-984471" @default.
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