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山东大学学报(医学版)

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糖尿病性GK大鼠脑缺血再灌注血管他丁及
基质金属蛋白酶9的表达

毕喜壮1,朱梅佳2,上官士娜3,贾茜4
  

  1. (1. 山东大学医学院, 济南 250012; 2. 山东大学附属千佛山医院神经内科, 济南 250014;
    3. 山东医学高等专科学校附属医院神经内科, 山东 临沂 276004;
    4. 首都医科大学附属北京天坛医院神经内科, 北京 100050)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2009-04-16
  • 通讯作者: 朱梅佳

Expressions of angiostatin and matrix metalloproteinase9 in the brain of type 2 diabetic GK rats after transient middle carotid artery occlusion

BI Xizhuang1, ZHU Meijia2, SHANGGUAN Shina3, JIA Qian4
  

  1. (1. School of Medicine, Shandong University, Jinan 250012, China;
    2. Department of Neurology, Qianfoshan Hospital Affiliated to Shandong University, Jinan 250014, China;
    3. Department of Neurology, Affiliated Hospital to Shandong Medical College, Linyi 276004, China;
    4. Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, China)
  • Received:1900-01-01 Revised:1900-01-01 Published:2009-04-16
  • Contact: ZHU Meijia

摘要: 目的研究糖尿病大鼠局灶性脑缺血再灌注后血管他丁、基质金属蛋白酶9在不同时间点的表达,探讨其病理生理机制。方法随机将GotoKakizaki (GK)、Wistar大鼠分为脑梗死组(CI组)、糖尿病脑梗死组(DM+CI组)及假手术组。采用线栓法建立大鼠大脑中动脉缺血再灌注模型,在不同的缺血再灌注时间点(3?h、24?h、3?d、7?d),采用Western blot法检测血管他丁蛋白表达、用明胶酶谱法检测基质金属蛋白酶9(MMP9)的活性。结果脑缺血再灌注后大鼠脑组织中血管他丁于再灌注3?h开始升高,至24h达到高峰,随后逐渐降低,在24?h时,DM+CI组较CI组增加显著(P<0.05);DM+CI组和CI组大鼠脑组织中MMP9的活性较假手术组明显增加,DM+CI组明显高于CI组(P<0.01),且血管他丁的表达与MMP9的活性存在直线相关关系。结论糖尿病缺血再灌注大鼠脑组织中的血管他丁的表达增加与MMP9的活性相关,参与糖尿病合并脑梗死的病理生理过程。

关键词: 血管生成抑制剂, 明胶酶B, 梗塞,大脑中动脉, 糖尿病, 大鼠,Wistar, 大鼠,GK

Abstract: To explore the pathophysiological mechanism of acute cerebral ischemia complicated with chronic diabetes by observing expressions of angiostatin protein in cerebral ischemic tissues at different ischemiareperfusion (I/R) time points. MethodsDiabetes groups[ GotoKakizaki (GK)] and control groups(Wistar rats )were randomly subdivided into 3 groups: the shamoperation group, the cerebral ischemic groups(CI) and the cerebral ischemic complicated with diabetes groups(DM+CI). Models of focal cerebral ischemiareperfusion were established by the Longa′s technique. Western blotting and SDSPAGE zymography were used to estimated the protein expressions of angiostatin and activity of MMP9 at different I/R time points (3?h, 24?h, 3?d、7?d). ResultsExpressions of angiostatin and activity of MMP9 in ischemic brain tissues started to increase at 3?h after reperfusion, reached peaks at 24?h and then gradually decreased, but still kept at a level above the basal level at 3?d. There was a significant increase of angiostatin expression in the DM+CI group compared with that in the CI groups at 24?h(P<0.05). Activity of MMP9 was more significantly increased in the DM+CI group than in the CI group at all I/R time points (P<0.01). There was a linear correlation between angiostatin expressions and MMP9 activity in the DM+CI and CI groups. ConclusionIncrease of MMP9 activity contributes to the upregulation of angiostatin and it may participate in the pathology of reperfusion of diabetic infarct brains.

Key words: Angiogenesis inhibitors, Gelatinase B, Infarction,middle cerebral artery, Diabetes mellitus, Rats,Wistar, Rats,GK

中图分类号: 

  • R743.32
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