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• W2026804593 startingPage "1086" @default.
• W2026804593 abstract "Rates of diabetes are reaching epidemic levels. The key problem in both type 1 and type 2 diabetes is dysfunctional insulin signaling, either due to lack of production or due to impaired insulin sensitivity. A key feature of diabetic retinopathy in animal models is degenerate capillary formation. The goal of this present study was to investigate a potential mechanism for retinal endothelial cell apoptosis in response to hyperglycemia. The hypothesis was that hyperglycemia-induced TNFα leads to retinal endothelial cell apoptosis through inhibition of insulin signaling. To test the hypothesis, primary human retinal endothelial cells were grown in normal glucose (5 mM) or high glucose (25 mM) and treated with exogenous TNFα, TNFα siRNA or suppressor of cytokine signaling 3 (SOCS3) siRNA. Cell lysates were processed for Western blotting and ELISA analyses to verify TNFα and SOCS3 knockdown, as well as key pro- and anti-apoptotic factors, IRS-1, and Akt. Data indicate that high glucose culturing conditions significantly increase TNFα and SOCS3 protein levels. Knockdown of TNFα and SOCS3 significantly increases anti-apoptotic proteins, while decreasing pro-apoptotic proteins. Knockdown of TNFα leads to decreased phosphorylation of IRS-1(Ser307), which would promote normal insulin signaling. Knockdown of SOCS3 increased total IRS-1 levels, as well as decreased IR(Tyr960), both of which would inhibit retinal endothelial cell apoptosis through increased insulin signaling. Taken together, our findings suggest that increased TNFα inhibits insulin signaling in 2 ways: 1) increased phosphorylation of IRS-1(Ser307), 2) increased SOCS3 levels to decrease total IRS-1 and increase IR(Tyr960), both of which block normal insulin signal transduction. Resolution of the hyperglycemia-induced TNFα levels in retinal endothelial cells may prevent apoptosis through disinhibition of insulin receptor signaling." @default.
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• W2026804593 date "2012-05-01" @default.
• W2026804593 modified "2023-09-27" @default.
• W2026804593 title "TNFα and SOCS3 regulate IRS-1 to increase retinal endothelial cell apoptosis" @default.
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• W2026804593 doi "https://doi.org/10.1016/j.cellsig.2012.01.003" @default.
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