自体成肌细胞移植改善兔心肌梗死后心功能的实验研究

目的:将体外培养并纯化的自体骨骼肌成肌细胞植入心肌梗死区,观察其心脏功能有无改善及改善程度,以探讨成肌细胞移植治疗的机制.方法:采用反复差速贴壁法体外培养、纯化及鉴定新西兰兔自体成肌细胞.结扎冠状动脉致局部心肌梗死后2周,分别将成肌细胞和对照的细胞培养液注入心肌梗死区,4周后观察心功能改善情况,鉴定心肌梗死边缘区毛细血...

Autologous myoblasts transplantation improves heart function after myocardiac infarction

Objective To determine whether autologous skeletal myoblasts implantation improves the cardiac function after myocardial infarction and the possible mechanism. Methods Myocardial infarction was induced by ligation of the left anterior descending coronary artery in rabbits. At 2 weeks, 1. 34 × 107 to 1.75 × 107 autologous skeletal myoblasts were infused into the lesion via direct intramuscular injection. In the control group, the postinfarction hearts were infused with medium alone. Buxco invasive cardiac function testing and histopathological examination were utilized to evaluate the functional and structural changes in the myocardium 4 weeks later. Results Both maximum rising rate of the left intraventricular pressure [+dp/dtmax,( 1 217.77 +89.91 )mmHg/s vs. (897.83 ±70.04) mmHg/s] and maximum falling rate of the left intraventricular pressure [- dp/dtmax,( -1174.58 ± 91.5 ) mmHg/s vs. ( - 753.67 ± 69.66 ) mmHg/s] were improved in the myoblast transplanted group compared with medium infusion group. The positive desmin immunostaining skeletal myofibers in the myocardium were found throughout the infracted areas and the border zone. Conclusion Autologous skeletal myoblasts can establish muscle tissue when transplanted into postinfarction hearts, and this mucle can treat myocardiac infarction effectively.