Aims: The objective of this study was to investigate the role of plasma and platelet microRNAs in the occurrence of ischemic stroke in patients with diabetes mellitus.
Methods: miR-223, miR-146a, miR-495, and miR-107 expression in the plasma and platelets, blood glucose concentration, and platelet activation rate were measured in patients with diabetes mellitus and ischemic stroke, diabetes mellitus only, ischemic stroke only, and healthy controls. Platelet activity was measured by flow cytometric measurement of P-selectin expression, while miRNA was measured by real-time PCR.
Results: The expressions of platelet and plasma miR-223 and miR-146a were significantly downregulated in patients with ischemic stroke and diabetes mellitus or diabetes mellitus only, but not in patients with ischemic stroke only compared to healthy controls. The expressions of platelet and plasma miR-495 and miR-107 showed no significant differences among these four groups. The expression of platelet miR-223 and miR-146a significantly correlated with plasma miR-223 and miR-146a levels, blood glucose concentration, and platelet activation rate.
Conclusions: Hyperglycemia may downregulate the expressions of miR-223 and miR-146a, leading to subsequent platelet activation in patients with diabetes mellitus. Low platelet and plasma miR-223 and miR-146a expression is a risk factor for ischemic stroke in Chinese diabetes mellitus patients.
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