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Significance Endothelial dysfunction plays a crucial role in the development of diabetic vasculopathy, but the mechanisms are not fully understood. In this study, we have revealed a previously undefined importance of serum exosomes in regulating endothelial function and vascular homeostasis in diabetes. Through comparative proteomics analysis, arginase1 was found enriched in diabetic serum exosomes and can be transferred to endothelial cells to inhibit NO production, thus impairing endothelial function. This is a cell-to-cell communication mechanism first identified to contribute to vascular dysfunction in diabetes.

Serum exosomes mediate delivery of arginase 1 as a novel mechanism for endothelial dysfunction in diabetes