252-LB: GRK2 Participates in Islet Function and Glucose-Stimulated Insulin Secretory Responses

Insulin deficiency is central to diabetes and diabetes-related cardiac dysfunction. GPCRs are known modulators of insulin secretion and a main pharmacological target in various tissues, including the heart. GPCR kinase 2 (GRK2) phosphorylates activated GPCRs, targeting receptors for recycling or degradation. Notably, we and others have shown that GRK2 can also localize to the cardiac mitochondria where it participates in substrate utilization, particularly in response to cellular stress. GRK2 is downregulated in the pancreas of diabetogenic mice, and we have shown that pancreatic loss of GRK2 impairs insulin secretion in normal and high fat diet. Mice with pancreatic-specific GRK2 KO showed glucose intolerance (AUC WT 8691 vs. KO 14766 mg/dl*min, n=22/group, p Disclosure J. W. Snyder: None. S. K. Montgomery: None. N. M. Doliba: None. J. Roman: None. Y. Tian: None. P. Y. Sato: None. W. L. Holland: None. R. Choi: None. Funding National Institutes of Health (1R56HL149887) ; University of Pennsylvania Diabetes Research Center Pilot and Feasibility Grant (P30-DK019525) ; American Heart Association Scientist Development Grant (17SDG33660407)