自体骨髓单个核细胞移植对小型猪心肌缺血再灌注损伤的作用

目的研究自体骨髓单个核细胞(BM-MNC)移植对小型猪心肌缺血再灌注损伤后心功能和梗死心肌的作用。方法结扎法建立心肌缺血再灌注损伤模型的16头小型猪,随机分为BM-MNC移植组(n=9)和磷酸盐缓冲液对照组(n=7),分别经冠状动脉移植(3.54±0.90)×108个BM-MNC细胞或磷酸盐缓冲液,对比移植4周时超声心动图、血液动力学、新生血管密度和心肌梗死面积的变化。结果BM-MNC组在细胞移植4周后左心室射血分数(LVEF)、室间隔、侧壁、前间壁厚度、心输出量和 dp/dtmax与细胞移植前比较,差异均无显著性(P>0.05)。对照组在细胞移植4周后,LVEF显著降低,室间隔、侧壁、前间壁显著变薄,心输出量和 dp/dtmax显著降低(P均<0.05)。舒张功能的指标在细胞移植前后各组变化不明显(P>0.05)。BM-MNC组缺血再灌注区的小血管数目为(13.39±6.96)个/高倍视野,显著高于对照组的(3.50±1.90)个/高倍视野(P<0.05)。BM-MNC组总心肌梗死面积和心肌梗死百分比均较对照组显著减少(P<0.05)。结论缺血再灌注区移植的BM-MNC可增加移植区新生小血管数目,减少心肌梗死面积,对改善心脏收缩功能起到一定作用。

Effect of intracoronary transplantation of autologous bone marrow mononuclear cells on myocardial ischemia reperfusion injury in mini-swine model

OBJECTIVE: To investigate the therapeutic effectiveness of intracoronary transplantation of autologous bone marrow mononuclear cells (BM-MNC) on myocardial ischemia reperfusion injury in mini-swine model. METHODS: Myocardial ischemia reperfusion injury model was established by ligating in 16 mini-swines, which were further randomized into two groups: (3.54 +/- 0.90) x 10(8) BM-MNC was intracoronarily transplanted in BM-MNC group (n = 9), and phosphate buffer saline was intracoronarily applied in the control group (n = 7). Ultrasonic cardiograhpy, hemodynamics, neovascular density, and myocardium infarction size were evaluated before and 4 weeks after transplantation. RESULTS: In BM-MNC group, left ventricular ejection fraction (LVEF), intra-ventricular septa, lateral wall and anterior wall, cardiac output (CO) and + dp/dt(max) had no significant differences before and 4 weeks after transplantation (P > 0.05). In the control group, LVEF, intraventricular septa, lateral wall and anterior wall, CO, and + dp/dt(max) significantly decreased 4 weeks after transplantation (P < 0.05). Left ventricular end-diastolic pressure and- dp/dt(max) had no significant differences before and after cell transplantation. Capillary density was significantly larger in the BM-MNC group than in the control group [(13.39 +/- 6.96) /HP vs. (3.50 +/- 1.90) /HP]. The percentage and size of myocardial infarction was significantly lower in the BM-MNC group than in the control group. CONCLUSION: Transplantation of BM-MNC into the myocardial ischemic reperfusion-injury area can increase capillary density and decrease infarction area, and thus remarkably improve cardiac systolic function.