电针对高脂血症合并脑缺血大鼠侧脑室室管膜下区神经干细胞增殖的影响

目的:探讨电针促进神经细胞再生的作用机制。方法:雄性SD大鼠72只,随机分为正常对照组、高脂血症模型组、高脂血症治疗组、脑缺血模型组、脑缺血治疗组、高脂血症合并脑缺血模型组、高脂血症合并脑缺血治疗Ⅰ组和Ⅱ组,每组9只。采用经典高脂饲料喂养,FeCl3化学诱导大脑中动脉血栓闭塞制造高脂血症合并脑缺血模型。高脂血症治疗组电针"三阴交""丰隆"穴;脑缺血治疗组针刺"百会""水沟"穴;治疗Ⅰ组先造成高脂血症模型,电针"三阴交""丰隆",每日1次,治疗10d后,造成脑缺血模型,再针刺"百会""水沟"穴;治疗Ⅱ组在联合模型造成后针刺"百会""水沟"和电针"三阴交""丰隆"穴,每日1次,治疗7d。治疗结束后,通过免疫组织化学方法检测大鼠缺血侧侧脑室室管膜下区(SPZ)背外侧伸展、外侧壁神经巢蛋白(Nestin)和增殖细胞核抗原(PCNA)的阳性细胞数。结果:Nestin、PCNA在正常和高脂血症大鼠脑组织表达较少;脑缺血后缺血侧SPZ中Nestin、PCNA的表达增强(P0.01);给予针刺干预后,脑缺血治疗组Nestin、PCNA的阳性细胞和反应强度较模型组明显增强(P0.01);合并模型组Nestin、PCNA表达远远弱于脑缺血模型组(P0.01);给予针刺干预后,合并模型治疗组Nestin、PCNA的阳性细胞表达高于合并模型组(P0.01),治疗Ⅰ组比Ⅱ组各部位Nestin、PCNA的表达要强(P0.01)。结论:高脂血症降低了脑缺血缺血侧SPZ神经干细胞的增殖,针刺具有促进高脂血症合并脑缺血后缺血侧SPZ神经干细胞增殖的作用。针刺治疗高脂血症可有效地预防和减轻脑缺血后脑组织损伤程度。

Effect of Electroacupuncture on the Proliferation of Stem Cells in the Subependymal Zone of the Lateral Ventricle of the Brain in Rats with Hyperlipemia and Cerebral Ischemia

Objective To observe the effect of electroacupuncture (EA) and acupuncture (A) on the proliferation of stem cells in the subependymal zone (SPZ) of the lateral ventricle and the frontal lobe cortex in hyperlipemia(HL) combined with cerebral ischemia (CI) rats. Methods A total of 72 male SD rats were randomized into control,HL,HL+ EA,CI,CI+A,HL+CI,HL+CI+EAⅠ and HL+CI+EAⅡgroups (n= 9 /group).HL model was established by feeding the animals with high fat forage for 6 weeks and CI model was established by FeCl3-induced occlusion of the unilateral middle cerebral artery. EA was applied to "Sanyinjiao" (SP 6) and "Fenglong" (ST 40) once daily for 17 days for HL+ EA group; and acupuncture to "Baihui" (GV 20) and "Shuigou" (GV 26) once daily for 7 days for CI+A group. For HL+CI+EA Ⅰ group,EA was applied to SP 6+ST 40 first before CI,once daily for 10 days,followed by EA of SP 6+ST 40 and acupuncture of GV 20+GV 26 for 7 days after CI. For HL+CI+EA Ⅱ group,no treatment was given before CI,then,acupuncture of GV 20+GV 26 and EA of SP 6+ST 40 were given once daily for 7 days after CI.The immunoactivity of Nestin and proliferation cell nuclear antigen (PCNA) of SPZ was detected by immunohistochemistry.Results In comparison with normal control group,the numbers of both Nestin and PCNA immunoreaction (IR) positive cells in the dorsolateral extension and the wall of the lateral ventricle of the brain increased significantly in CI and HL+CI groups (P<0.01). Compared with CI group,the numbers of Nestin and PCNA IR positive cells in the dorsolateral extension and the wall of the lateral ventricle in CI+A group increased considerably (P<0.01). In comparison with HL+CI group,both Nestin and PCNA IR positive cell numbers in the dorsolateral extension and the wall of the lateral ventricle of the brain in HL+CI+EA Ⅰand HL+CI+EA Ⅱ groups increased significantly (P<0.01),and the effect of HL+CI+EA Ⅰgroup was markedly superior to that of HL+CI+EA Ⅱ group in upregulating the numbers of Nestin and PCNA IR positive cells in the aforementioned regions of the lateral ventricle (P<0.01). No significant differences were found between HL and control groups,and between HL+EA and HL groups in the numbers of Nestin and PCNA IR positive cells in the dorsolateral extension and the wall of the lateral ventricle of the brain (P>0.05). Conclusion EA can upregulate Nestin and PCNA expression of the dorsolateral extension and the wall of the lateral ventricle of the brain on the ischemic side in rats with CI,and with HL+CI,which may contribute to its effects in promoting the proliferation and migration of neural stem cells in the brain.