[Protective effects of praeruptorin C and nifedipine on ischemia-reperfused injury in working rat hearts].

The effects of praeruptorin C (Pra-C, 15 mg/kg, bid x 3 d, ip) on global myocardial ischemia and reperfusion were investigated in the isolated working rat hearts. The results at 35 min after reperfusion showed that as compared with the values before ischemia, AP, LVSP, +dP/dtmax, -dP/dtmax, LVEDP and T were recovered up to 80 +/- 19%, 82 +/- 16%, 78 +/- 21%, 85 +/- 11%, 136 +/- 77% and 133 +/- 21%, respectively. The corresponding parameters of Nifedipine (Nif, 60 micrograms/kg, bid x 3 d, ip) were 80 +/- 16%, 97 +/- 30%, 102 +/- 24%, 106 +/- 32%, 129 +/- 41% and 145 +/- 46%, respectively. The CF, SV and HR were recovered by 81 +/- 11%, 104 +/- 20% and 78 +/- 7% when using Pra-C and 86 +/- 11%, 106 +/- 25% and 82 +/- 11%, respectively, when using Nif. Additionally, in comparison of Pra-C and Nif with the ischemia group, the levels of creatine kinase released from cardiac cells decreased by 30% and 40%; while calcium accumulation in myocardial mitochondria were 41% and 46%, respectively. The study suggests that the protective effects of Pra-C on myocardial cells in the isolated working rat heart during myocardial ischemia are similar to those Nif.