摘要目的 研究急性脊髓损伤(ASCI)大鼠核因子kappa B(NF-kB)与细胞凋亡及肢体功能间的相关性.方法 共选取48只雌性SD大鼠,将其随机分为实验组及对照组.2组大鼠均采用手术切除椎板,对照组术中未进行脊髓压迫处理,实验组大鼠术中采用压迫法制作脊髓中度损伤模型.2组均于术后第4 h、8 h、1 d、3 d、7 d及14 d时各随机选取4只大鼠,参照BBB评分标准对其后肢功能进行评定,待评分结束后处死大鼠并提取脊髓标本,采用免疫组织化学染色法检测各组大鼠脊髓标本内NF-κB、Bcl-2及Bax表达水平.结果 实验组大鼠受损脊髓神经细胞中有NF-κB、Bcl-2及Bax表达,且表达水平随术后时间延长呈现先增高、后降低过程;大鼠肢体功能BBB评分随时间延长而逐渐升高.经相关性分析发现,随着术后时间延长,实验组大鼠NF-κB表达量与Bcl-2表达量无明显相关性(P＞0.05),与Bax表达量有正相关性(P＜0.05),与Bcl-2/Bax比值及BBB评分有负相关性(P＜0.05).结论 ASCI大鼠NF-κB表达与Bcl-2/Bax比值及肢体运动功能均具有显著负相关性.

abstractsObjective To investigate the relationship of nuclear factor kappa B(NF-κB),Bcl-2 and Bax with limb function after acute spinal cord injury in rats. Methods Forty-eight rats were divided at random into a control group and an experimental group with 24 rats in each.The spinal cords of the rats in the experimental group were injured at the T8,9,10 level through moderate compression.Four hours,8 h,and 1,3,7 and 14 days after the injury,4 rats were selected randomly from each group and graded with a BBB score.They were then sacrificed and their spinal cords were collected.Immunohistochemical measurements were used to observe the expression of NF-κB, Bcl-2 and Bax. Results NF-κB,Bcl-2 and Bax were observed in the injured spinal nerve cells of rats in the exper imental group but were absent in the control group.After injury,the expression of these factors increased at first and then decreased.BBB scores for limb function increased gradually.No correlation was found between the changes in NF-κB and Bcl-2,but the expression of NF-κB was positively correlated with that of Bax.There was negative correla tion between NF-kB levels and BBB scores,and between NF-kB levels and the ratio of Bcl-2 to Bax. Conclusion In rats,there is a close negative correlation between NF-kappa B levels,the ratio of Bcl-2/Bax and limb function after acute spinaI cord iujury.