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- W2119692514 abstract "Hepatic insulin gene therapy (HIGT) produces near-normal glycemia in diabetic rats. Hepatic insulin production is expected to stimulate glycogen storage. However, the effect of HIGT on hepatic glycogen metabolism in vivo is unknown.After administration of an adenoviral vector capable of inducing glucose responsive insulin production from hepatocytes, we evaluated circulating hormones, cytokines, hepatic gene expression and hepatic glycogen content in diabetic CD-1 mice receiving intravenous streptozotocin. Nondiabetic mice and diabetic mice treated with empty adenovirus served as controls.Peripheral concentrations of human insulin in HIGT mice were less than concentrations of mouse insulin among controls. However, expression of insulin responsive genes in HIGT livers indicated a significant intra-hepatic insulin effect, with expression changes reflecting appropriate responses to fed-fasting transitions. Transcription factors (hepatocyte nuclear factor-4alpha and peroxisome proliferator-activated receptor gamma co-activator-1alpha), as well as target genes (phospho-enol-pyruvate carboxykinase, glucose-6-phosphatase and glucokinase) exhibited insulin responsive expression. Despite producing near normal glycemia, HIGT diminished hepatic glycogen content in both fasted and fed mice. Serum cytokine responses revealed both vector-related (monocyte chemoatractant protein-1, interleukin-6) and transgene specific (resistin, tumor necrosis factor alpha) effects.HIGT produces low circulating concentrations of insulin, but produces significant intra-hepatic effects on gene expression. Despite controlling hyperglycemia, HIGT exerts unexpected insulin effects on hepatic carbohydrate metabolism. Although the precise mechanisms remain to be determined, they may relate to vector-induced cytokine effects." @default.
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- W2119692514 date "2009-07-01" @default.
- W2119692514 modified "2023-09-23" @default.
- W2119692514 title "Hepatic insulin gene therapy diminishes liver glycogen despite insulin responsive transcriptional effects in diabetic CD-1 mice" @default.
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- W2119692514 doi "https://doi.org/10.1002/jgm.1341" @default.
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