内源性碱性成纤维细胞生长因子是大鼠对抗心脏缺血/再灌注损伤的保护因子

Endogenous basic fibroblst growth factor is a protective factor against myocardial ischemia/reperfusion injury of rats

目的 :观察内、外源性碱性成纤维细胞生长因子 (bFGF)在大鼠心脏缺血 /再灌注 (I/R)损伤中的作用。方法 :在大鼠离体心脏I/R模型上分别给以bFGF和bFGF抗血清 ,以生理多导仪测定心率、±LVdp/dtmax及左心室终末舒张压 (LVEDP)变化 ,并测定冠脉流量、冠脉流出液中蛋白、肌红蛋白含量、乳酸盐脱氢酶 (LDH)活性以及心肌组织钙、丙二醛 (MDA)、三磷酸腺苷 (ATP)含量和蛋白激酶 (PKC)、丝裂素活化蛋白激酶 (MAPK)活性。结果 :I/R组心功能显著低于对照组 ,冠脉流出液中蛋白、肌红蛋白含量、LDH活性及心肌MDA、钙含量显著升高 ,ATP含量显著降低 (均P <0 0 1)。bFGF组±LVdp/dtmax较I/R组分别高 42 8%和 2 5 6 % ,LVEDP低 40 0 % ,再灌末心率 /预灌末心率 (HRr/HRi)及冠脉流量的 (B/A)分别高 42 3 %和 2 0 3% ,冠脉流出液中蛋白、肌红蛋白含量及LDH活性分别少 2 8 8%、30 2 % (均P <0 0 1)和 32 3% (P <0 0 5 ) ,心肌MDA和钙含量分别少 44 4%和 35 6 % ,ATP含量高 33 8%。心肌PKC、MAPK活性分别高 41 3%和 10 1% (均P <0 0 1) ;bFGF抗血清组±LVdp/dtmax较I/R组分别低 35 1%和 38 1% ,LVEDP高 92 5 % ,HRr/HRi及冠脉流量的B/A分别少 36 0 %和 45 4% ,冠脉流出液中蛋白、肌红蛋白和LDH漏出分别?

AIM: To observe the role of exogenous and endogenous basic fibroblst growth factor (bFGF) on myocardial ischemia/reperfusion(I/R) injury of rats.METHODS:bFGF and bFGF antiserum were applied to rat isolated I/R heart. Myocardial function, coronary effluent volume,protein and myoglobin content as well as LDH activity in coronary effluent fluid, myocardial calcium, MDA and ATP concentration as well as PKC, MAPK activity were measured. RESULTS:Compared with control, myocardial function in I/R group significantly decreased. Protein, myoglobin content and LDH activity in coronary effluent liquid as well as myocardial MDA and calcium content increased, while myocardial ATP concentration decreased(all P <0.01). Compared with I/R group, ±LV d p /d t max in bFGF group increased by 43% and 26%, respectively. LVEDP decreased by 40%. HRr/HRi and B/A augmented by 42% and 20%, respectively. Protein and myoglobin content as well as LDH activity lowered by 29%,30% (all P <0.01) and 33% ( P <0.05) respectively. Myocardial MDA and calcium content decreased by 44% and 35%, respectively, while myocardial ATP level as well as PKC and MAPK activity increased by 34%,41% and 10% (all P <0.01), respectively. In bFGF antiserum group, ±LV d p /d t max were 35% and 38% lower than those in I/R group. LVEDP increased by 93%. HRr/HRi and B/A decreased by 36% and 45%, respectively. Protein and myoglobin content as well as LDH activity augmented by 54%,96% (all P <0.01) and 34% ( P <0.05) respectively. Myocardial MDA and calcium content increased by 24% and 50%, respectively, while myocardial ATP level as well as PKC and MAPK activity lowered by 28%,21% and 8% (all P <0.01), respectively. CONCLUSION:Endogenous bFGF is a protective factor against myocardial ischemia/reperfusion injury of rats.