不同时间窗电针结合经颅磁刺激对脑梗死大鼠B细胞淋巴瘤／白血病-2基因及脑源性神经营养因子表达的影响

The effect of electroacupuncture combined with transcranial magnetic stimulation on the expression of the Bcell lymphoma/leukemia-2 genes and brain derived neurotrophic factor in rats after cerebral infarction

目的 观察大鼠脑缺血/再灌注后不同时间窗介入电针及经颅磁刺激（TMS）对其B细胞淋巴瘤/白血病-2基因（Bcl-2）和脑源性神经营养因子（BDNF）表达的影响.方法 将100只SD大鼠随机分为正常组、假手术组、治疗组及模型组,每组又根据术后干预时间点不同细分为术后6 h、12 h、24 h、48 h及72 h共5个亚组.采用线栓法将治疗组及模型组大鼠制成左侧大脑中动脉栓塞/再灌注（MCAO/R）模型.治疗组各亚组大鼠分别于脑缺血/再灌注后第6,12,24,48及72小时给予电针及TMS治疗,而正常组、假手术组及模型组各亚组均于上述相同时间点给予假电针及假TMS治疗.各组大鼠均于治疗后第14天时取脑,采用实时荧光定量PCR技术检测脑梗死灶Bcl-2及BDNF mRNA表达情况.结果 各组大鼠梗死侧脑标本中均检测到BDNF及Bcl-2 mRNA阳性表达,治疗组各亚组Bcl-2及BDNF mRNA表达均显著高于模型组各亚组水平（P〈0.05）;对治疗组各亚组进行组内比较发现,该组各亚组间BDNF及Bcl-2 mRNA（除术后12 h与术后72 h亚组外）组间差异均具有统计学意义（P〈0.05）,其中以术后48 h亚组BDNF及术后24 h亚组Bcl-2 mRNA表达水平相对较高.结论 于脑缺血/再灌注后24～48 h期间介入电针及TMS治疗,能显著促进脑梗死大鼠BDNF及Bcl-2表达,对保护受损神经细胞、促进神经功能恢复具有重要意义.

Objective To study the effect of electroacupuncture （EA） combined with transcranial magnetic stimulation （TMS） on the expression of the B-cell lymphoma/leukemia-2 gene （Bcl-2） and brain derived neurotrophic factor （BDNF） after cerebral infarction. Methods One hundred Sprague-Dawley rats were randomly and equally divided into a normal group, a sham-operated control group, a model group and an EA plus TMS group. A cerebral infarction model was established in the latter two groups using left middle cerebral artery occlusion （MCAO）. Five-member subgroups of the EA plus TMS group were then treated at 6, 12, 24,48 and 72 hours after reperfusion. Sham EA plus TMS was given to similar sub-groups from the other groups at the same time points. The expression of Bcl-2 mRNA and BDNF mRNA were measured using a RT-PCR at the 14th day. Results Positive expression of Bcl-2 mRNA and BDNF mRNA was detected around the infarction in all groups. The average expression of both was significantly higher in the EA plus TMS group than in the model group. Bcl-2 mRNA peaked when the therapy was administered at 24 hours and BDNF mRNA at 48 hours.Conclusions The expression of Bcl-2 mRNA and BDNF mRNA is maximized when EA plus TMS is administered 24-48 hours after cerebral infarction. EA plus TMS does have protective and rehabilitative effects on rats after cerebral infarction.