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The cardioprotective effect of naringenin against ischemia-reperfusion injury through activation of ATP-sensitive potassium channel in rat. | LitMetric
Naringenin (Nari) has antioxidative and anti-atherosclerosis effects, and activation of ATP-sensitive potassium channel (KATP) can offer cardiac protection. We hypothesized that Nari protects the heart against ischemia-reperfusion (I-R) injury through activation of KATP. Isolated hearts from adult male Sprague-Dawley rats experienced a 30-min global ischemia followed by 60-min reperfusion (120 min for the infarct size determination). The hearts were treated with Nari (NARI); Nari plus glibenclamide (GLI), a non-specific ATP-sensitive potassium channel blocker (NARI+GLI); and Nari plus 5-hydroxy decanoic acid (5-HD), a mitochondrial membrane ATP-sensitive potassium channel blocker (NARI+5-HD). The left ventricular pressure, lactate dehydrogenates (LDH) in coronary effluent, superoxide dismutase (SOD) and malondialdehyde (MDA) in myocardium, and myocardial infarct area were measured. Nari above 2.5 μmol/L improved the recovery of left ventricular function, decreased LDH in coronary effluent, and reduced myocardial infarct area. The SOD activity was increased and MDA was decreased in Nari-treated myocardium. The cardioprotective effect of Nari was canceled by GLI and 5-HD. In conclusion, Nari has a cardioprotective effect against I-R injury, which may be carried out through activating ATP-sensitive potassium channels in both cell and mitochondrial membrane, and enhancing myocardial antioxidant capacity.
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