中文摘要：

目的探究大鼠脊髓损伤后ski相关蛋白（SKIP）的表达及其变化规律。方法 60只成年雌性Sprague-Dawley大鼠随机分为假手术组（n=30）和打击组（n=30）,每组分为1 d、3 d、5 d、7 d、14 d五个时间点,各6只。打击组用Allen法制作T10打击损伤模型,假手术组只咬开椎板。采用BBB评分评价后肢运动功能;尼氏染色观察损伤后脊髓神经元的病理变化;免疫荧光染色观察损伤脊髓SKIP的表达情况。结果打击组各时间点BBB评分均显著低于假手术组（t〉48.267,P〈0.001）。与假手术组相比,打击组5 d脊髓神经元胞浆中尼氏小体开始崩解、凝聚,分布不规则,神经元变性坏死,14 d时损伤加重。免疫荧光染色显示,SKIP主要在脊髓灰质中表达,白质中极少表达;损伤后SKIP表达逐渐上升,5 d时达到高峰（t=-17.035,P〈0.001）,14 d时明显降低（t=3.853,P〈0.05）。结论 SKIP可能是一种作用于神经元并影响其凋亡的新的信号分子。

英文摘要：

Objective To explore the expression and change of ski-interacting protein（SKIP） in rats after spinal cord injury.Methods A total of 60 adult female Sprague-Dawley rats were randomly divided into sham group（n=30） and spinal cord injury（SCI） group（n=30）,each group was further divided into five time points including one day,three days,five days,seven days,and 14 days with six rats in each time points.The model was established at T10 with modified Allen＇s technique,and the sham group only bit the lamina of rats.The hindlimbs behavior was assessed with Basso-Beattie-Bresnahan（BBB） score at each time point.The pathological changes of spinal cord neurons were detected with Nissl staining.The expression of SKIP were observed with immunofluorescence staining.Results The BBB scores were significantly lower in each time point in SCI group than in the sham group（t48.267,P〈0.001）.Compared with the sham group,Nissl bodies in the cytoplasm of spinal cord neurons began to disintegrate,coalesce and irregularly distribute,the neurons began to degenerate and die on the fifth day,and the damage deteriorated on the 14 th day.Immunofluorescence staining showed that SKIP expression was mainly expressed in the gray matter of the spinal cord and little expressed in the white matter.The expression of SKIP gradually increased after SCI,and reached a peak on the fifth day（t=-17.035,P〈0.001） and decreased significantly on the 14 th day（t=3.853,P〈0.05）.Conclusion SKIP may be a new signaling molecule,which play an important role in neuronal apoptosis after SCI.