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The Diabetic Coronary Microcirculation is Regulated by MicroRNA‐21

Coronary microvascular dysfunction is particularly common among diabetes and overlaps with impaired endothelial‐dependent vasodilation. These impairments are seen in early stages of the disease, but detailed mechanisms have yet to be elucidated. Nitric oxide (NO) is the major endothelial‐dependent mediator of vasodilation in the healthy coronary circulation, but this mediator changes to hydrogen peroxide (H2O2) in coronary artery disease (CAD) patients. Because diabetes is a risk factor for CAD, we hypothesized that a similar switch would occur.