Experimental study on simvastatin for inhibiting oxidative stress after acute myocardial infarction in rats / 重庆医学

ABSTRACT

Objective To establish the rat myocardial infarction model to observe the effects of different kinds of doses of simv-astatin for inhibiting the oxidative stress after myocardial infarction ,and to explore the potential mechanism of different doses of simvastatin for improving the rat ventricular remodeling and cardiac function .Methods The coronary artery anterior descending branch was ligated for establishing the myocardial infarction rat model and the different doses of simvastatin (20 ,40 ,60 mg · kg -1 · d-1 ) were given for intervention .After 4 weeks ,the cardiac ventricular remodeling indicators ,superoxide dismutase(SOD) and cop-per zinc superoxide dismutase(CuZn-SOD) activity in myocardium ,blood H2 O2 level were detected and the detection results were compared with those in the sham operation group .Results The rat ventricular remodeling in the myocardial infarction group (M group) was significant ,the left ventricular mass index (LVWI) was elevated ,the heart rate was increased and the hemodynamics was disordered(P<0 .05) .The SOD and CuZn-SOD expression in the myocardium and blood H2O2 expression were elevated(P<0 .05) .The LVW1 in different doses of simvastatin intervention groups were decreased compared with the myocardial infarction group(P<0 .05) ,the heart rate was decreased ,SOD and CuZn-SOD expression and blood H2 O2 expression were decreased ,the he-modynamics was improved(P<0 .05) ,especially which in the high dose atorvastatin intervention group (60 mg · kg -1 · d-1 ) were more significant .Conclusion Simvastatin reduces the expression of oxidative stress after acute myocardial infarction ,which may be one of the mechanisms for improving the ventricular remodeling and heart function ,and has certain positive correlation with dose .