知识与财富的链接
目的:观察不同时间预防性应用甲基强的松龙(methylprednisolone,MP)后脊髓缺血再灌注损伤局部热休克蛋白27(HSP27)表达的变化,探讨MP预防脊髓缺血再灌注损伤的最佳用药时间.方法:75只SD大鼠随机分为A、B、C、D、E组.每组15只.A组仅暴露腹主动脉,而不做其他处理;B、C、D、E组均通过夹闭腹主动脉30min造成脊髓缺血再灌注损伤,C、D、E组分别于损伤前30min、1h、3h尾静脉注射30mg/kg MP,B组于损伤前30min尾静脉注射与MP组等容量的生理盐水.A组于术后3h、其他组于损伤后3h取脊髓标本固定、切片,行HE染色观察脊髓神经元胞体、胞核、核仁的形态,神经元的极性和尼氏体的染色情况;行免疫组化染色检测HSP27表达,用染色阳性物质平均吸光度值A代表相对含量.结果:HE染色显示,A组为正常的神经元表现;B组神经元胞体萎缩,胞核、核仁、尼氏体均显示不清,极性消失;C组胞体萎缩较B组明显减轻,可观察到胞核和核仁,极性存在,尼氏体显示欠均匀;D组胞体萎缩较重,个别神经元内无法分辨胞核、核仁,极性不明显,尼氏体染色不均匀:E组与B组比较无明显差别.A、B、C、D、E组的HSP27染色阳性物质平均吸光度值A分别为63.76±3.02、100.32±4.13、132.05±5.03、121.92±4.68、102.16±5.96,C组、D组HSP27表达均较B组增强(P<0.05),且C组与D组比较有显著性差异(P<0.05),E组和B组比较无显著性差异(P>0.05).结论:缺血再灌注损伤前30min使用MP可最大程度上调HSP27的表达,减轻脊髓缺血再灌注损伤.
Objective:To study the interference effect of methylprednisolone(MP) at different time points on the expression of heat shock protein 27 (HSP27) in ischemia-reperfusion spnal cord injury.Method:75 SD rats were divided into five groups randomly (n=15):Group A,B,C,D and E.In group A,aortic artery was ex- posed alone as control.Animals in group C,D and E all underwent 30min of occlusion to aortic artery,and animals in group C,D and E received 30mg/kg of MP at 30min,1h and 3h prior to injuryrepectively.Animals ...
