ABSTRACT
Aim To investigate the role of transient receptor potential ankyrin 1 receptor in remote preconditioning of trauma-induced cardioprotection against myocardial ischemia-reperfusion injury and related mechanism. Methods SD rats were randomly divided into five groups: Sham operation group(Sham), model group(IR), remote preconditioning of trauma group(RPCT), TRPA1 inhibitor+remote preconditioning of trauma group(TCS+RPCT)and TRPA1 inhibitor group(TCS). The model of myocardial ischemia/reperfusion in rats was established, and the hemodynamics was monitored throughout the process. After reperfusion, the rat heart was taken to measure the myocardial infarction area and myocardial apoptosis rate, the activity and protein expression of mitochondrial aldehyde dehydrogenase 2(ALDH2)and the expression of 4-hydroxynonenal(4-HNE)were detected. Results Compared with sham group, myocardial infarction area and myocardial apoptosis cell increased. Meanwhile, the activity and expression of ALDH2 decreased and the production of 4-HNE increased in IR group. However, compared with IR group, RPCT group had decreased myocardial infarction area and the rate of cardiomyocyte apoptosis, the activity and expression of ALDH2 increased, the production of 4-HNE decreased. And then, compared with RPCT group, TCS+RPCT group reduced the myocardial protective effect of remote preconditioning of trauma. Conclusions TRPA1 receptor mediates the effect of remote preconditioning of trauma alleviating myocardial ischemia/reperfusion injury in rats. Its mechanism may be related to regulating ALDH2 activity and protein expression, and affecting the content of 4-HNE.