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Published evidence suggests regulatory roles for small G proteins (Cdc42 and Rac1) in glucose-stimulated insulin secretion (GSIS) from pancreatic beta-cells. More recent evidence suggests novel roles for these G proteins, specifically Rac1, in the induction of metabolic dysfunction of the islet beta-cell under the duress of a variety of stress conditions. However, potential upstream regulators of sustained activation of Rac1 have not been identified in the beta-cell. Recent studies in other cell types have identified RhoG, a small G protein, as an upstream regulator of Rac1 under specific experimental conditions. Herein, we examined putative roles for RhoG in islet beta-cell dysregulation induced by glucotoxic conditions.

RhoG-Rac1 Signaling Pathway Mediates Metabolic Dysfunction of the Pancreatic Beta-Cells Under Chronic Hyperglycemic Conditions.