远程缺血后适应对大鼠脑缺血再灌注损伤后MIP-1α表达的影响
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国家自然科学基金项目(面上项目,重点项目,重大项目)


The Effect of Remote Ischemic Postconditioning on MIP-1alpha Expression Induced by Cerebral Ischemia-Reperfusion Injury in Rats
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    目的 观察远程缺血后适应(Remote Ischemia Postconditioning, RIPostC)对大鼠脑缺血再灌注损伤后巨噬细胞炎症蛋白-1α(Macrophage Inflammatory Protein, MIP-1α)表达的影响,初步探讨RIPostC对炎症反应的作用。方法 采用线栓法制备MCAO模型,77只健康雄性Sprague Dawley(SD)大鼠(280-310g)随机分为7组,每组11只:(1)假手术组(S);(2)8 h对照组(I8);(3)RIPostC 8 h组(R8);(4)24 h对照组(I24);(5)RIPostC 24 h组(R24);(6)72 h对照组(I72);(7)RIPostC 72 h组(R72)。远程缺血后适应的具体操作方法为在大鼠脑缺血即刻夹闭双侧股动脉10分钟,放开10分钟,如此共进行三个循环。分别应用荧光定量RT-PCR、免疫印迹法及免疫荧光法研究大鼠脑缺血再灌注8 h、24 h和72 h时MIP-1α mRNA和蛋白质表达的变化。结果 (1)荧光定量RT-PCR结果显示:与S组相比,I组及R组大鼠缺血后MIP-1αmRNA的表达均有所增加,其中I8 h、R8 h和R24 h组MIP-1α mRNA的表达显著升高(P<0.05)。(2)Western blot结果表明:与S组比较,I组及R组大鼠缺血后MIP-1α蛋白水平的表达均有所增加,其中I24 h和I72 h组MIP-1α蛋白表达显著增高(P<0.05)。与I组比较,R24 h和R72 h组MIP-1α蛋白表达呈下降趋势,其中R72 h组下降显著,具有统计学意义(P<0.05)。(3)免疫荧光结果显示:MIP-1α的变化趋势同Western Blot结果相同。结论MIP-1α参与了大鼠脑缺血再灌注损伤的炎症反应,而远程缺血后适应可能通过减轻炎症反应而发挥脑保护作用。

    Abstract:

    Objective To observe the effect of remote ischemic postconditioning (RIPostC) on macrophage inflammatory protein-1alpha (MIP-1α) expression induced by cerebral ischemia-reperfusion injury in rats, and preliminary investigate the effect of RIPostC on inflammatory response. Methods A total of 77 male Sprague-Dawley (SD) rats (280-310g) were randomly divided into 7 groups: (1) Sham group (S); (2) I/R 8 h group (I8); (3) I/R RIPostC 8 h group (R8); (4) I/R 24 h group (I24); (5) I/R RIPostC 24 h group (R24); (6) I/R 72 h group (I72); (7) I/R RIPostC 72 h group (R72). In the I/R groups, transient middle cerebral artery occlusion (MCAO) models were induced; In the I/R RIPostC groups, limb RIPostC was carried out by three cycles of 10 min occlusion/10 min release of the bilateral femoral artery using clamps immediately after reperfusion. Real-time quantitative PCR (QTR-PCR), western blot and immunofluorescence staining were used to observe the expression levels of MIP-1α. Results (1) The results of QRT-PCR demonstrated that the mRNA expression of MIP-1α were increased in both I/R and I/R R groups. I8, R8 and R24 groups were significantly increased (P<0.05). (2) Western blot showed that, compared with S group, the protein expression of MIP-1α were increased in both I/R and I/R R groups. I24, I72 groups were significantly increased (P<0.05). Compared with I/R group, the protein expression of MIP-1α were reduced in R24 and R72 groups, which R72 group was significantly decreased, with statistical significance (P<0.05). (3) The immunofluorescence results verify the conclusions of the Western blot. Conclusion MIP-1α involved in the inflammatory response induced by cerebral ischemic-reperfusion injury in rats, and remote ischemic postconditioning probably reduce inflammatory response to protect brain followed ischemic-reperfusion injury.

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王荣亮,罗玉敏.远程缺血后适应对大鼠脑缺血再灌注损伤后MIP-1α表达的影响[J].中国比较医学杂志,2013,23(8).

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  • 收稿日期:2013-05-28
  • 最后修改日期:2013-05-30
  • 录用日期:2013-06-24
  • 在线发布日期: 2013-08-29
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