[Effects of L-carnitine and bisoprolol on endoplasmic reticulum stress-mediated myocardial injury after cardiopulmonary resuscitation in rats].

OBJECTIVE

To explore the effects of L-carnitine and bisoprolol on endoplasmic reticulum stress-mediated myocardial injury after cardiopulmonary resuscitation in rats.

METHODS

A total of 75 Sprague-Dawley rats were randomly divided into 5 groups of sham operation (sham); cardiopulmonary resuscitation (CR), L-carnitine (L), bisoprolol treatment (B) and L-carnitine and bisoprolol treatment (LB). Myocardial pathological changes were detected by hematoxylin and eosin, myocardial apoptosis by terminal deoxynucleotidyl transferase mediated dUTP nick and the expressions of key factors in endoplasmic reticulum (ER) by Western blot.

RESULTS

Compared with sham group, apoptosis and pathological lesions significantly increased in other groups (P < 0.05). And the levels of GRP78, CHOP and Caspase-12 were significantly higher (P < 0.05). The expression of ER factor protein and the degrees of myocardial injury in LB and B groups decreased compared with CR group. And LB group was the most obvious.

CONCLUSIONS

Combined use of levocarnitine and bisoprolol exerts protective effects on cardiopulmonary resuscitation in rats. And the mechanism may be related to an inhibition of ER stress.