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• W2030907897 abstract "The cholesterol-lowering drugs statins could enhance the activities of endothelial nitric oxide synthase (eNOS) and protect myocardium during ischemia and reperfusion. The aim of this study was to examine whether protein kinase A (PKA) was involved in statin-mediated eNOS phosphorylation and cardioprotection.6-Month-old Chinese minipigs (20-30 kg) underwent a 1.5-h occlusion and 3-h reperfusion of the left anterior descending coronary artery (LAD). In the sham group, the LAD was encircled by a suture but not occluded. Hemodynamic and cardiac function was monitored using a polygraph. Plasma activity of creatine kinase and the tissue activities of PKA and NOS were measured spectrophotometrically. p-CREB, eNOS and p-eNOS levels were detected using Western blotting. Sizes of the area at risk, the area of no-reflow and the area of necrosis were measured morphologically.Pretreatment of the animals with simvastatin (SIM, 2 mg/kg, po) before reperfusion significantly decreased the plasma activity of creatine kinase, an index of myocardial necrosis, and reduced the no-reflow size (from 50.4%±2.4% to 36.1%±2.1%, P<0.01) and the infarct size (from 79.0%±2.7% to 64.1%±4.5%, P<0.01). SIM significantly increased the activities of PKA and constitutive NOS, and increased Ser(133) p-CREB protein, Ser(1179) p-eNOS, and Ser(635) p-eNOS in ischemic myocardium. Intravenous infusion of the PKA inhibitor H-89 (1 μg·kg(-1)·min(-1)) partially abrogated the SIM-induced cardioprotection and eNOS phosphorylation. In contrast, intravenous infusion of the eNOS inhibitor L-NNA (10 mg·kg(-1)) completely abrogated the SIM-induced cardioprotection and eNOS phosphorylation during ischemia and reperfusion, but did not affect the activity of PKA.Pretreatment with a single dose of SIM 2.5 h before reperfusion attenuates myocardial no-reflow and infarction through increasing eNOS phosphorylation at Ser(1179) and Ser(635) that was partially mediated via the PKA signaling pathway." @default.
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• W2030907897 date "2012-06-04" @default.
• W2030907897 modified "2023-10-04" @default.
• W2030907897 title "Phosphorylation of endothelial NOS contributes to simvastatin protection against myocardial no-reflow and infarction in reperfused swine hearts: partially via the PKA signaling pathway" @default.
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• W2030907897 doi "https://doi.org/10.1038/aps.2012.27" @default.
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