Chinese Journal of Tissue Engineering Research ›› 2015, Vol. 19 ›› Issue (27): 4322-4327.doi: 10.3969/j.issn.2095-4344.2015.27.011

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The increased activation of matrix metalloproteinase 2/9 and gradual degradation of claudin in rat models of middle cerebral artery ischemia 

Liang Jia1,Qi Zhi-feng2, Shi Wen-juan2, Liu Ke-jian2   

  1. 1Science Experimental Center of Liaoning Medical University, Jinzhou 121001, Liaoning Province, China; 
    2Cerebrovascular Diseases Research Institute, Xuanwu Hospital of Capital Medical University, Beijing 100053, Chin
  • Online:2015-06-30 Published:2015-06-30
  • Contact: Liu Ke-jian, Professor, Cerebrovascular Diseases Research Institute, Xuanwu Hospital of Capital Medical University, Beijing 100053, China
  • About author:Liang Jia, Studying for doctorate, Science Experimental Center of Liaoning Medical University, Jinzhou 121001, Liaoning Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81171242; a grant from Principal Foundation of Liaoning Medical University of China, No. XZJJ20140105

Abstract:

BACKGROUND: During the process of acute brain injury after stroke, matrix metalloproteinase can undermine the integrity of vascular basement membrane, promote the migration of neutrophils and inflammatory factors, and cause secondary brain injury.
OBJECTIVE: To investigate the activation of matrix metalloproteinase 2/9 and the degradation rule of claudin in rat models of middle cerebral artery ischemia at different ischemic durations.
METHODS: Thirty-nine male SD rats were randomly divided into three groups according to different ischemic 
durations (3, 5 and 7 hours) . Middle cerebral artery occlusion (stroke) model was established using modified suture method, i.e., separation of the external carotid artery, inserting the suture into the internal carotid artery through the external carotid artery, and eventually reaching the middle cerebral artery. The ischemic duration in these three groups was respectively 3 , 5 and 7 hours. After 2 hours of reperfusion, Zea-Longa score and Ludmila Belayev score, brain infarct area, matrix metalloproteinase 2/9 activities and claudin 5 degradation were determined in each group.
RESULTS AND CONCLUSION: With the extension of ischemic duration, brain infarct area gradually increased, central nervous system damage gradually aggravated, matrix metalloproteinase 2/9 activities gradually increased, and claudin-5 expression gradually decreased. There were significant differences between any two ischemic durations in terms of each of above-mentioned indices. The results indicate that after long duration of ischemia, the progressive damage of brain tissue can cause the gradual increase of activation of matrix metalloproteinase 2/9 and the gradual degradation of claudin 5.

中国组织工程研究杂志出版内容重点:肾移植肝移植移植;心脏移植;组织移植;皮肤移植;皮瓣移植;血管移植;器官移植组织工程

Key words: Cerebral Ischemia, Matrix Metalloproteinase 2, Matrix Metalloproteinase 9, Claudin

CLC Number: