Microparticles from Patients with the Acute Coronary Syndrome Impair Vasodilatation by Inhibiting the Akt/eNOS-Hsp90 Signaling Pathway

Cardiology
Wen-Qi HanJun-Qiang Pan

Abstract

Endothelial dysfunction is involved in the development of the acute coronary syndrome (ACS). Plasma microparticles(MPs) from other diseases have been demonstrated to initiate coagulation and endothelial dysfunction.However, whether MPs from ACS patients impair vasodilatation and endothelial function remains unclear. Patients(n = 62) with ACS and healthy controls (n = 30) were recruited for MP isolation. Rat thoracic aortas were incubated with MPs from ACS patients or healthy controls to determine the effects of MPs on endothelial-dependent vasodilatation,the phosphorylation of Akt and endothelial nitric oxide synthase (eNOS), the interaction of eNOS with heat shock protein 90 (Hsp90), and nitric oxide (NO) and superoxide anion(O 2 – ) production. The origin of MPs was assessed by flow cytometry. MP concentrations were increased in patients with ACS compared with healthy controls. They were positively correlated with the degree of coronary artery stenosis. MPs from ACS patients impair endothelial-dependent vasodilatation, decrease both Akt and eNOS phosphorylation,decrease the interaction between eNOS and Hsp90,and decrease NO production but increase O 2 – generation in rat thoracic aortas. Endothelial-derived MPs and platelet-d...Continue Reading

Citations

Sep 3, 2016·Biomarkers in Medicine·Åsa ThulinAgneta Siegbahn
May 22, 2019·Journal of Investigative Surgery : the Official Journal of the Academy of Surgical Research·Xiao-Yong GengYong-Jun Li
Dec 17, 2019·Current Medicinal Chemistry·Effimia ZachariaDimitris Tousoulis

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