Effects of Hydrogen Sulfide on oxidative stress in acute myocardial ischemia injury in rats

Objective To investigate effects of H2 S on myocardial ischemia injury in rats and explore the possible mechanism from oxidative stress.Methods Fourty-eight male SD rats were randomly divided into 6 groups:sham operation group,ischemia group,ischemia + NaHS low,middle and high dose groups and ischemia + PPG group.The acute myocardial ischemia model was established by ligating the left anterior descending coronary artery(LAD) of the rats.Saline was intraperitoneally administrated in ischemia group.LADs were not ligated but only threaded in sham operation group in rats.In ischemia + NaHS low,middle and high dose groups or ischemia + PPG group,sodium hydrosulfide(NaHS) or DL-propargylglycine(PPG) was intraperitoneally injected respectively at 3 hours after ischemia.All rats were killed at 6 hours after the operation.The content of malondialdehyde (M DA),and the activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) in myocardial tissue were respectively measured.The pathological changes of myocardial tissue were observed with electron microscope.Results Compared with those of sham operation group,the myocardial structural damage was increased,the content of MDA was significantly increased,and the activities of SOD and GSH-Px were significantly decreased in ischemia group in rats ((P ＜ 0.01).Compared with those of ischemia group,the myocardial structural damage was alleviated,the content of MDA was significantly decreased,and the activity of SOD was significantly increased in ischemia + NaHS low,middle and high dose groups ; the activity of GSH-Px was significantly increased in ischemia + NaHS middle and high dose groups in rats (P ＜ 0.05).Compared with those of ischemia group,the myocardial structural damage was increased,the content of MDA was increased,the activities of SOD and GSH-Px were decreased in ischemia + PPG group in rats (P ＜ 0.05).Conclusion The administration of H2S could significantly alleviate the myocardial injury by increasing the activities of SOD and GSH-Px,and decreasing the MDA synthesis in acute myocardial ischemia. Key words: Hydrogen sulfide ;  Myocardial ischemia ;  Oxidative stress ;  Cytoprotection