[Sevoflurane postconditioning attenuates myocardial apoptosis in isolated rat hearts via a modulation of Bcl-2 family proteins].

ABSTRACT

OBJECTIVE: To explore the effects of sevoflurane postconditioning on ischemic/reperfused myocardial apoptosis. METHODS: Isolated perfused rat hearts were randomly assigned into 3 groups sham-operation (sham), ischemia/reperfusion (I/R) and sevoflurane postconditioning (SPC). Except for the sham group, the hearts were subjected to 40 min global myocardial ischemia and 120 min reperfusion. Left ventricular systolic pressure (LVSP), left ventricular developed pressure (LVDP), left ventricular end-diastolic pressure (LVEDP), maximum increase rate of LVDP (+dp/dt), maximum decrease rate of LVDP (-dp/dt), heart rate (HR) and coronary flow (CF) were measured at baseline, R (reperfusion) 30 min, R60 min, R90 min and R120 min. Creatine kinase (CK) and lactate dehydrogenase (LDH) were measured at 5 min and 10 min post-reperfusion. Infarct size was determined by triphenyltetrazolium chloride staining at the end of reperfusion. The expressions of Bcl-2 and Bax were determined by Western blot. RESULTS: The values of LVSP, LVDP, ± dp/dt and CF were higher while that of LVEDP was lower in the SPC group than the I/R group at all time points of reperfusion (P < 0.05). The releases of CK and LDH and infarct size were significantly reduced in the SPC group versus the I/R group (22.2% ± 2.8% vs I/R 44.9% ± 6.6%, P < 0.05). The expression of Bcl-2 increased significantly while that of Bax decreased in the SPC group verus the I/R group. CONCLUSION: Sevoflurane postconditioning may improve myocardial functions, reduce infarct size and attenuate myocardial apoptosis. And the modulated expression of apoptotic proteins plays an important role in sevoflurane-induced myocardial protection.