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重复高压氧预处理对大鼠脊髓缺血再灌注损伤保护中环氧合酶-2表达的影响及机制 被引量:8

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摘要 目的探讨重复高压氧预处理对大鼠脊髓缺血再灌注损伤保护中环氧合酶-2(COX-2)表达的影响。方法雄性SD大鼠40只,体重260~320 g,应用随机数字表法分为四组(n=10):假手术组(Sham组)、脊髓缺血再灌注组(I/R组)、重复高压氧预处理组(HOP组)及COX-2抑制剂NS398预处理的HOP组(HOP-NS398组)。HOP实施高压氧预处理的参数为:氧浓度>97%,氧含量900 ml/L,压力2.5 ATA,1 h/d,连续5 d;最后一次处理后24 h,I/R、HOP及HOP-NS398组采用夹闭腹主动脉15 min再开放的方法制备脊髓缺血再灌注模型。再灌注48 h后评价后肢运动功能,而后处死大鼠,取L5~7节段脊髓组织,测定COX-2 mRNA及蛋白表达水平,光镜下观察病理学结果。结果与Sham组比较,I/R、HOP和HOP-NS398组后肢运动功能和正常脊髓前角运动神经元计数降低,L5~7节段脊髓组织中COX-2 mRNA及蛋白表达水平上调(P<0.05);与I/R组比较,HOP及HOP-NS398组后肢运动功能和正常脊髓前角运动神经元计数升高,L5~7节段脊髓组织COX-2 mRNA及蛋白表达水平下调(P<0.05)。与HOP组比较,HOP-NS398组后肢运动功能、正常脊髓前角运动神经元计数降低,COX-2表达升高(P<0.05)。HOP组脊髓组织病理学损伤程度轻于I/R组,而HOP-NS398组损伤程度重于HOP组,但仍轻于I/R组。结论重复高压氧预处理可减轻大鼠脊髓缺血再灌注损伤,其机制可能与调节COX-2表达有关。
出处 《中国老年学杂志》 CAS CSCD 北大核心 2013年第13期3134-3136,共3页 Chinese Journal of Gerontology
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参考文献11

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二级参考文献12

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