RESUMEN
Objective: To investigate the effect and mechanism of brain-derived neurotrophic factor (BDNF) pretreatment for reducing myocardial ischemia/reperfusion (I/R) injury in experiment rats. Methods: Rat’s myocardial I/R model was established by left anterior descending artery ligation for 30min followed-by reperfusion for 180 min. The rats were divided into 5 groups:Sham operation group, I/R group and IR with BDNF pretreatment (1, 10, 100) nmol/(kg·ml) groups respectively. The LVSP, LVEDP, ±dp/dtmax were recorded after I/R;serum levels of LDH, CK and the cardiac tissue levels of MDA, SOD were examined;the ratios of left ventricular myocardial infarction area in different groups were observed by by Evans blue staining;cell apoptosis rates were evaluated by Tunel staining;the total-TrkB and p-TrkB in myocardium were detected by Western-blot analysis. Result: Compared with I/R group, in 3 IR with BDNF pretreatment groups, LVSP, ±dp/dtmax were gradually increasing and LVEDP were gradually decreasing, all P Conclusion: BDNF pretreatment could maintain the cardiac function in experiment rats after I/R injury, it may reduce MI area, decrease oxidative damage and apoptosis, therefore, protect myocardial cells for reducing IR injury.