神经节苷脂对大鼠脊髓损伤后微管相关蛋白-2表达的影响及意义

[目的]通过观察单唾液酸四己糖神经节苷脂(monosialotetrahexosyl gangliosides,GM-1)对于大鼠脊髓损伤(spinal cord injury,SCI)后微管相关蛋白-2(microtubule-associated protein 2,MAP-2)表达及运动功能恢复是否能够产生影响来探讨CM-1对大鼠脊髓损伤后神经细胞的保护作用及其机制.[方法]Wistar雌性大鼠66只(体重260～300 g),随机取6只作为正常对照组,余60只采用改良Allen's打击法于T9-11节段椎管制作大鼠急性SCI模型,并随机分为GM-1组(A组)和生理盐水对照组(B组)两组,每组各30只.分别于术后1、7、14、28、56 d采用Rivilin斜扳试验、改良Tarlov评分评价大鼠后肢运动功能恢复程度后处死取材,每组各时相点6只.以组织学和免疫荧光染色观察大鼠脊髓损伤的修复情况.[结果]术后7d起,Rivilin斜扳试验和Tarlov评分在A、B组间比较有显著性差异(P<0.0105),即A组功能恢复明显优于B组.术后56 d:HE染色示A组大鼠脊髓损伤处无明显空洞和瘢痕组织,有各种形态细胞形成,部分细胞有明显分化特征;B组脊髓断端被瘢痕组织填塞,可见大量炎性细胞和成纤维细胞浸润,并有较大脊髓空洞形成.免疫荧光染色发现,A组各时相点MAP-2表达呈阳性细胞数较B组高,差异有统计学意义(P <0.0105).[结论]SCI后,动物神经功能的恢复与MAP-2的表达呈一定的相关性;GM-1可通过增强脊髓损伤后MAP-2的表达来保护大鼠受损后脊髓的神经元.

Effects and significance of monosialotetrahexosyl gangliosides on the expression of microtubule associated protein-2 after rat spinal cord injury

[Objective]To investigate the protective function and mechanism of GM-1 in neuronal cells after SCI by observating whether GM-1 can affect the expression of MAP-2 and the recovery of neurological function after SCI.[Method]Sixty-six adult female Wistar rats(weighing 260-300 g),six of which were randomly taken as normal control group,and the others(60) were used to make acute SCI models at T9-11 level according to the improved Allen's method and were randomly divided into 2 groups(n=30,each):the GM-1 group(g...