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Glucagon Regulates Hepatic Kisspeptin1 to Impair Insulin Secretion #MMPMID24703698
Song WJ; Mondal P; Wolfe A; Alonso LC; Stamateris R; Ong BWT; Lim OC; Yang KS; Radovick S; Novaira HF; Farber EA; Farber CR; Turner SD; Hussain MA
Cell Metab 2014[Apr]; 19 (4): 667-81 PMID24703698show ga
Early in the pathogenesis of Type 2 diabetes mellitus (T2DM), dysregulated glucagon secretion from pancreatic ?-cells occurs prior to impaired glucose stimulated insulin secretion (GSIS) from ?-cells. However, whether hyperglucagonemia is causally linked to ?-cell dysfunction remains unclear. Here we show that glucagon stimulates via cAMP-PKA-CREB signaling hepatic production of the neuropeptide kisspeptin1, which acts on ?-cells to suppress GSIS. Synthetic kisspeptin suppresses GSIS in vivo in mice and from isolated islets in a kisspeptin1 receptor-dependent manner. Kisspeptin1 is increased in livers and in serum from humans with T2DM and from mouse models of diabetes mellitus. Importantly, liver Kiss1 knockdown in hyperglucagonemic, glucose intolerant high fat diet fed and Leprdb/db mice augments GSIS and improves glucose tolerance. These observations indicate a hormonal circuit between the liver and the endocrine pancreas in glycemia regulation and suggest in T2DM a sequential link between hyperglucagonemia via hepatic kisspeptin1 to impaired insulin secretion.