电针合谷穴对大鼠局灶性脑缺血再灌注后脑内毛细血管密度及CD34表达的影响

摘要

目的：观测电针大鼠双侧合谷穴(LI04)对局灶性脑缺血再灌注后脑内CD34表达及血管新生的影响。方法90只大鼠随机分为正常组(n=6)、模型组(n=42)和电针组(n=42)。模型组和电针组采用线栓法制备大鼠局灶性脑缺血再灌注模型，电针组采用电针治疗。局灶性脑缺血1h后再灌注，观察再灌注后2h、12h、24h、3d、7d、14d、21d共7个时相点大鼠神经症状学评分，采用HE染色观察并计算梗死体积和毛细血管密度，免疫组织化学法检测CD34的表达。结果电针组与模型组比较，再灌注后各时间点神经症状学评分降低(P<0.05)。电针组梗死体积显著小于模型组(P<0.001)。与模型组相比，电针组毛细血管密度再灌注后2 h开始增加(P<0.05)，再灌注后24 h到再灌注后14 d均较模型组明显增加(P<0.01)。电针组再灌注后3 d CD34阳性细胞表达较模型组明显增加(P<0.01)，7 d增加达高峰(P<0.01)，14 d仍有显著性差异(P<0.05)。结论电针能促进局灶性脑缺血再灌注后CD34的表达，增加毛细血管密度，促进血管新生。%Objective To observe the effect of electroacupuncture at Hegu (LI04) on capillary density and expression of CD34 after focal cerebral ischemia/reperfusion in rats. Methods 90 rats were randomly divided into normal group (n=6), model group (n=42) and electroacu-puncture group (n=42). A rat model of focal cerebral ischemia/reperfusion was made by filament occlusion in the model group and the elec-troacupuncture group. And the electroacupuncture group received electroacupuncture. They were observed 2 h, 12 h, 24 h, 3 d, 7 d, 14 d, 21 d after reperfusion 1 h followed ischemia. HE staining was used to observe and calculate the infarct volume and capillary density, and immu-nohistology was used to detect the expression of CD34 after neurologic symptoms rating. Results Compared with the model group, the neuro-logic symptoms score significantly decreased 2 h after reperfusion in the electroacupuncture group (P<0.01), and still decreased 21 d after re-perfusion (P<0.05). The infarct volume significantly was smaller in the electroacupuncture group than in the model group (P<0.01). The cap-illary density was higher 2 h, 24 h, 3 d, 7 d, 14 d after reperfusion in the electroacupuncture group than in the model group (P<0.05). Com-pared with the model group, the expression of CD34 significantly increased 3 d after reperfusion in the electroacupuncture group (P<0.01), and it reached a peak at 7 d after reperfusion (P<0.01), and still higher at 14 d. Conclusion Electroacupuncture can promote the expression of CD34 and the capillary density, and stimulate the angiogenesis after focal ischemia/reperfusion.