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Macrophage levels are elevated in pancreatic islets, and the resulting inflammatory response is a major contributor to beta cell failure during obesity and type 2 diabetes mellitus. Previous studies by us and others have reported that exosomes released by macrophages play important roles in mediating cell-to-cell communication, and represent a class of inflammatory factors involved in the inflammatory process associated with type 2 diabetes mellitus. However, to date, no reports have demonstrated the effect of macrophage-derived exosomes on beta cells, and little is known regarding their underlying mechanisms in beta cell injury. Thus, we aimed to study the impact of macrophage-derived exosomes on islet beta cell injury in vitro and in vivo.

diabetologia

M1 macrophage-derived exosomes impair beta cell insulin secretion via miR-212-5p by targeting SIRT2 and inhibiting Akt/GSK-3β/β-catenin pathway in mice