【摘要】 背景:实验研究表明,电针对于脊髓损伤的功能恢复具有促进作用,可以降低疼痛,提高急性脊髓损伤的术后疗效。目的:观察脊髓挫伤造模后电针刺激干预对损伤区细胞凋亡的影响,并分析其对脊髓挫伤大鼠神经功能保护的可能作用机制。方法:成年雌性SD大鼠66只,采用随机区组法分为假手术组20只和大鼠急性脊髓挫伤造模成功40只,造模成功大鼠再随机分为脊髓挫伤组、电针刺激组。分别于造模前、造模后1 d、3 d、1周、2周、3周、4周通过BBB评分、斜板试验进行运动功能评定。造模后3 d,通过TUNEL法检测各实验组大鼠脊髓挫伤区神经细胞的凋亡情况;RT-PCR、Western blot检测脊髓挫伤区周围bax、bcl-2、caspase-3基因转录和蛋白的表达;苏木精-伊红染色观察脊髓挫伤区病理组织形态学变化;HRP示踪观察神经纤维的再生情况。结果与结论:1电针刺激组2项运动功能评分在治疗后2周各个时间点均较脊髓挫伤组显著增加(P<0.05)。2造模后3 d经脊髓电针刺激组细胞凋亡指数均明显低于脊髓挫伤组(P<0.05)。3造模后72 h,与脊髓挫伤组相比经脊髓电针刺激组bax、caspase-3基因和蛋白表达显著降低(P<0.05);bcl-2基因和蛋白表达显著升高(P<0.05)。4造模后4周,HRP阳性神经纤维数:假手术组最多,电针刺激组次之,脊髓挫伤组最少,各组之间差异有显著性意义(P<0.05)。结果提示,电针刺激治疗通过减少大鼠脊髓挫伤区神经细胞的凋亡对脊髓挫伤起到保护作用。更多还原

【Abstract】 BACKGROUND: Electroacupuncture has promoting effects on the functional recovery of the injured spinal cord, can decrease pain, and elevate postoperative effect after acute spinal cord contusion.OBJECTIVE: To observe the effect of electroacupuncture on apoptosis in the injured site after spinal cord contusion, and analyze its neuroprotective effects on neurological function in rats with spinal cord contusion. METHODS: A total of 66 adult female Sprague-Dawley rats were randomly divided into: sham surgery group(n=20), spinal cord contusion group(n=20), electroacupuncture stimulation group(n=20) because six rats were excluded due to modeling failure and death. Before model establishment, at 1, 3 days, 1, 2, 3 and 4 weeks after model establishment, motor functions were evaluated by BBB score and the inclined plate test. At 3 days after model establishment, apoptosis of nerve cells could be detected in the site of injury in each experimental group using TUNEL assay. m RNA and protein expression of bax, bcl-2 and caspase-3 was detected surrounding the injury site using RT-PCR and western blot assay. Morphological changes in the site of injury could be observed using hematoxylin-eosin staining. The regeneration of nerve fibers was observed using HRP tracing. RESULTS AND CONCLUSION:(1) Motor function score was significantly increased at various time points in the 2nd week of treatment in the electroacupuncture stimulation group than in the spinal cord contusion group(P < 0.05).(2) Apoptotic index was significantly lower in the electroacupuncture stimulation group than in the spinal cord contusion group at 3 days after model establishment(P < 0.05).(3) m RNA and protein expression of bax and caspase-3 was significantly lower in the electroacupuncture stimulation group than in the spinal cord contusion group at 72 hours(P < 0.05); bcl-2 gene and protein expression was significantly higher(P < 0.05).(4) The number of HRP-positive nerve fibers was highest in the sham surgery group, followed by electroacupuncture stimulation group, and lowest in the spinal cord contusion group at 4 weeks(P < 0.05). Results indicated that electroacupuncture plays a protective role on the spinal cord contusion by reducing apoptosis of nerve cells at the site of injury.更多还原