电针对局灶性脑缺血再灌注大鼠脑细胞凋亡及神经功能恢复的影响

目的 观察针刺干预对于大鼠局灶性脑缺血再灌注脑细胞内游离钙、Caspase-3 mRNA及大鼠双前肢抓力的影响.方法 145只成年雄性SD大鼠随机分成对照组(sham)、缺血再灌注组(1/R)和针刺组(I/R+EA).选用Longa改良线拴法制备大鼠局灶性脑缺血再灌注模型(MCAO).实验大鼠处死后取材制成单细胞悬液,经Fluo-3/AM标记,用激光扫描共聚焦显微镜检测脑细胞Ca2+]i浓度.应用RT-PCR技术检测大鼠大脑皮层和纹状体内Caspase-3 mRNA表达的变化.大鼠双前肢抓力试验检测大鼠神经功能重建情况.结果 ①针刺干预6h后Ca2+]i为10.96±1.18,针刺12h后为20.9±4.73,与缺血再灌注组16.87±3.56,34.10±1.06]比较显著降低,差异有统计学意义(P＜0.01).②I/R组大脑皮层及纹状体Caspase-3 mRNA表达增强;电针干预后Caspase-3 mRNA表达与I/R组比较明显下调.③针刺7d、14d大鼠抓力明显高于脑缺血再灌注7d、14d,针刺30d、60d、90d大鼠抓力与脑缺血再灌注30d、60d、90d组大鼠抓力无明显差异.采用单因素方差分析,I/R+EA与sham及I/R组比较(P＜0.05),差异有统计学意义.结论 缺血急性期针刺干预显著降低大鼠局灶性脑缺血再灌注脑细胞内游离钙的浓度及Caspase-3 mRNA的表达;并有效促进大鼠神经功能的恢复.

Effect of electroacupuncture on brain cells apoptosis and nerve function recovery after focal cerebral ischemia-reperfusion in rats

Objective To investigate the influence of acpuncture on free calcium in rat brain cells after focal cerebral ischemia reperfusion.Methods 145 adult male SD rats were randomly divided into control group,simple ischemia reperfusion group and acupuncture with ischemia reperfusion group.The middle cerebral artery occlusion/reperfusion (MCAO/R) rat model was established by the modified Longa occlusion method. ①The part of free calcium in rat brain cells,focal cevebral ischemia model of rats were made by thread locking up the blood vessel for 15 min.30 min later after reperfusion, the Baihui and Shuigou Point in Du meridian were acupunctured electrically 30 min.After 3h, 6h and 12h, the rat was killed and its brain cells were made into single cell suspension,marked by Fluo-3/AM.The fluorescence optical density was recorded by laser confocal microscopy.②The part of nerve functional reconstruction, focal cevebral ischemia model of rats were made by thread locking up the blood vessel for 12 hours.30 min later after reperfusion, the Baihui and Shuigou Point in Du meridian were acupunctured electrically 30 min.After 7 d, 14 d,30 d,60 d and 90 d, the rat was forced to detect it's strength of the dog.Results ①Free calcium in rats of acupuncture therapy group(6h:10.96±1.18;2h:20.9±4.37) was significantly less than that in control group in 6 h and 12 h after reperfusion (6 h: 16.87 ± 3.56,12 h: 34.10 ±1.06)(P<0.05).②The dog in rats of acupuncture therapy group was significantly more than that in control group in 7 d, 14 d after reperfusion (P＜ 0.05 ).No difference of the dog was detected in 30 d ,60 d and 90 d after reperfusion between the two groups.Conclusion Acupunture could decreases the concentration of free calcium and the expression of Caspase-3 mRNA in rat brain cells after focal cerebral ischemia reperfusion, and it can facilitate the recovery of nerve function.