ObjectiveTo investigate the impactsof different time-course electroacupuncture pretreatments on brain water content and blood-brain barrier permeability and assess their protecting effects on blood-brain barrier functionin cerebral ischemia rats. MethodClean-grade healthy male SD rats were randomly allocated to five groups (n=48): model control group, and one-day, three-day, seven-day and fifteen-day electroacupuncture pretreatment groups. A rat model of unilateral middle cerebral artery occlusion (MCAO) was made after electroacupuncture pretreatment was finished in various electroacupuncture groups. The water content of the brain and the amount of EB through blood brain barrier were measured at 12, 24 and 48 hrs after cerebral ischemia. ResultBoth brain water content and EB permeation amount were lower at 12 and 48 hrs than at 24 hrs after cerebral ischemia (P<0.05). There was a significant reducing effect on brain water content and EB permeation amount in the fifteen-day electroacupuncture pretreatment group at various time points after cerebral ischemia (P<0.05,P<0.01,P<0.001).Conclusion The blood-brain barrier is impaired most severely at 24 hrs of the three time points 12, 24 and 48 hrs after cerebral ischemia. Electroacupuncture pretreatment can produce a protecting effect on blood-brain barrier function in cerebral ischemia rats by markedly reducing cerebral edema and blood-brain barrier permeability.%目的：通过观察不同时程电针预处理对脑缺血大鼠脑含水量及血脑屏障通透性的影响,评价电针预处理对脑缺血大鼠血脑屏障功能的保护效应。方法将清洁级健康雄性SD大鼠随机分为5组(n=48),模型对照组、电针预处理1 d组、电针预处理3 d组、电针预处理7 d组及电针预处理15 d组,电针预处理各组电针预处理结束后建立大鼠单侧大脑中动脉阻塞(MCAO)模型,分别于脑缺血12 h、24 h和48 h,检测脑含水量、血脑屏障EB透过量。结果模型对照组脑缺血12 h和48 h时间点大鼠脑含水量及血脑屏障EB透过量均低于脑缺血24 h时间点(P＜0.05)；电针预处理15 d组在脑缺血各时间点对脑含水量及EB透过量的减少作用显著(P＜0.05,P＜0.01,P＜0.001)。结论脑缺血12 h、24 h、48 h3个时间点中以脑缺血24 h时间点血脑屏障损伤程度显著；电针预处理可通过明显降低脑缺血大鼠脑水肿及血脑屏障通透性发挥其对脑缺血大鼠血脑屏障功能的保护效应。
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