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The Potential Role of SOCS-3 in the Interleukin-1ß-Induced Desensitization of Insulin Signaling in Pancreatic Beta-Cells

From INSERM U145, Faculty of Medicine, Nice, France

Defects in insulin secretion, resulting from loss of function or destruction of pancreatic ß-cells, trigger diabetes. Interleukin (IL)-1ß is a proinflammatory cytokine that is involved in type 1 and type 2 diabetes development and impairs ß-cell survival and function. Because effective insulin signaling is required for the optimal ß-cell function, we assessed the effect of IL-1ß on the insulin pathway in a rat pancreatic ß-cell line. We show that IL-1ß decreases insulin-induced tyrosine phosphorylation of the insulin receptor (IR) and insulin receptor substrate (IRS) proteins as well as phosphatidylinositol 3-kinase (PI3K) activation, and that this action is not due to the IL-1ß-dependent nitric oxide (NO) production in RINm5F cells. We next analyzed if suppressor of cytokine signaling (SOCS)-3, which can be induced by multiple cytokines and which we identified as an insulin action inhibitor, was implicated in the IL-1ß inhibitory effect on insulin signaling in these cells. We show that IL-1ß increases SOCS-3 expression and induces SOCS-3/IR complex formation in RINm5F cells. Moreover, we find that ectopically expressed SOCS-3 associates with the IR and reduces insulin-dependent IR autophosphorylation and IRS/PI3K pathway in a way comparable to IL-1ß treatment in RINm5F cells. We propose that IL-1ß decreases insulin action in ß-cells through the induction of SOCS-3 expression, and that this effect potentially alters insulin-induced ß-cell survival.

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