Abstract
The formation of new blood vessels in the ischemic area is a fundamental strategy that can reduce myocardial infarction-induced damage by mitigating hypoxia. This paper set out to investigate the cardioprotective effect of high-intensity interval training preconditioning and L-arginine supplementation on myocardial ischemia–reperfusion-induced angiogenesis and oxidative stress. 50 male rats were randomly distributed into following groups: (1) Sham, (2) Sedentary control (Con, n = 10), 3) L-arginine treatment (La, n = 10), (4) High-Intensity Interval Training (HIIT, n = 10), and High-Intensity Interval Training plus L-arginine supplementation (HIIT + La, n = 10). Rats in the training groups performed high-intensity interval training for 8 weeks (5 day per week). Subjects in La and HIIT + La groups received L-arginine in drinking water (4 g/L). 72 h after treatments, all subjects underwent myocardial ischemia–reperfusion operation. Cardiac function, angiogenesis, stress oxidative, and infarction size were measured after reperfusion. Results showed exercise training and L-arginine supplementation promoted Cat and GSH activities and decreased MDA activity following myocardial ischemia–reperfusion injury in non-infarcted area. Compared with the con group, VEGF and Ang-1 as well as Ang-1 to Ang-2 ratio following myocardial ischemia–reperfusion in the non-infarct area were higher in La + HIIT group. Meanwhile, capillary density and capillary-to-muscle fiber ratio were higher in response to training and L-arginine supplementation. HIIT and L-arginine alone and synergistically decreased ischemia–reperfusion-induced infarction size. Cardiac output and stroke volume ameliorate in response to exercise training and L-arginine supplementation. Taken together, exercise preconditioning and l-arginine supplementation improved left ventricular function following ischemia–reperfusion by stress oxidative mitigation and angiogenesis amelioration.
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The dataset used and analyzed during the current study is available from Dr. Ranjbar on reasonable request.
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Ranjbar, K. Improved Cardiac Function Following Ischemia Reperfusion Injury Using Exercise Preconditioning and L-Arginine Supplementation via Oxidative Stress Mitigation and Angiogenesis Amelioration. Cardiovasc Toxicol 22, 736–745 (2022). https://doi.org/10.1007/s12012-022-09752-8
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DOI: https://doi.org/10.1007/s12012-022-09752-8