摘要
目的探究ski在大鼠正常及损伤后脊髓中的表达及随时间变化的规律。方法 60只成年雌性Sprague-Dawley大鼠,随机分为假手术组(n=30)和损伤组(n=30),各组设1周、2周、4周、8周、12周亚组,每个亚组6只大鼠。用Allen法制备T10打击损伤模型。损伤后1 d、3 d、1周、2周、4周、8周、12周行BBB后肢功能评分;术后1周、2周、4周、8周、12周,各组取3只大鼠行HE染色,观察损伤后脊髓病理变化及空洞形成;另3只大鼠行ski免疫荧光染色及半定量分析。结果损伤组各时间点BBB评分均低于假手术组(P<0.05)。损伤后1周、2周,脊髓主要以坏死为主;4周时空洞完全形成,空洞周围有致密瘢痕组织;8周、12周空洞及瘢痕无明显变化,但损伤中心及附近脊髓明显变细。ski在正常脊髓中表达较低,损伤后ski表达逐渐增高,8周时达到高峰,12周时有所降低;ski在正常及损伤后12周脊髓中主要分布于白质;损伤后2周、4周和8周时灰质中出现明确ski表达。在损伤中心,ski在空洞周围密集表达。结论 ski在脊髓损伤后表达。它可能作用于星形胶质细胞,并调控其活化、增生以及胶质瘢痕形成。
Objective To explore the expression and the changes of ski with time in the injured spinal cord in rats. Methods Sixty adult female Sprague-Dawley rats were randomly divided into sham group （n=30） and injury group （n=30）, each group were further divided into 1 week, 2 weeks, 4 weeks, 8 weeks and 12 weeks subgroups, with 6 rats in each subgroup. Spinal cord injury at T10 was established with modi-fied Allen＇s technique （10 g ×25 mm） in the injury group. The hindlimbs behavior of rats was rated with Basso-Beattie-Bresnahan （BBB） scores 1 day, 3 days, 1 week, 2 weeks, 4 weeks, 8 weeks and 12 weeks after spinal cord injury. Three rats in each subgroup were stained with HE staining to observe the pathological changes of the spinal cord and the formation of cavity. The other 3 rats were analyzed with im-munofluorescence staining of ski and semi quantitative analysis. Results The BBB scores of each time point were less in the injury group than in the sham group （P〈0.05）. Necrosis was the major pathological change in the injury groups 1 and 2 weeks after injury;cystic cavity completely formed 4 weeks after injury, with dense scar tissue around it;there was no significant change in the cavity and scar 8 and 12 weeks after injury, however, the adjacent spinal cord was obviously thinner. Ski expressed little in the normal spinal cord, and expressed more and more after injury, peaked at 8 weeks and decreased then. Ski was mainly observed in white matter in the sham group and 12 weeks injury subgroup, which was in gray matter 2, 4 and 8 weeks after injury. Ski was highly expressed around the cavity in injury center and formed high expression band. Conclusion Ski expresses after spinal cord injury in rats, that may be associated with the activation and prolif-eration of astrocytes and the formation of glial scar.
出处
《中国康复理论与实践》
CSCD
北大核心
2016年第9期1015-1019,共5页
Chinese Journal of Rehabilitation Theory and Practice
基金
国家自然科学基金项目(No.30772299)
