大鼠脑缺血/再灌注后早期AQP4的动态表达及其与脑水肿关系的研究  

Dynamic expression of AQP4 in early stageof ischemia/reperfusion rats and cerebral edema

作　　者：许淑红[1,2] 康辰[3] 陈美灵[1] 周珮珮 何广卫[4] 崔亚娇 杨迪[1] 吴玉林[1] 

机构地区：[1]中国药科大学基础医学与临床药学学院,江苏南京211198 [2]中国医学科学院北京协和医学院药物研究所,北京100050 [3]美国俄亥俄州立大学药学院药理室,美国哥伦布市43210 [4]合肥医工医药有限公司,安徽合肥230031

出　　处：《中国药理学通报》2016年第10期1433-1441,共9页Chinese Pharmacological Bulletin

基　　金：国家"科技部重大新药创制"科技重大专项基金资助项目(No 2009ZX09103-123)

摘　　要：目的 研究局灶性脑缺血/再灌注损伤大鼠脑组织病理变化及脑组织水通道蛋白4（AQP4）和相关蛋白表达变化,以探索AQP4与脑水肿的关系。方法 ♂成年SD大鼠150只,体质量250-300g,随机分为假手术（Sham）组和脑缺血/再灌注损伤模型（I/R）组,其中I/R组又分为I/R-6h、I/R-12h、I/R-24h、I/R-48h4个时间点组别。采用线栓法阻塞大脑中动脉建立局灶性脑缺血/再灌注模型,于相应时间点进行神经症状评分,EB染色检测脑组织通透性,TTC染色观察脑梗死体积,干湿重法检测脑含水量的变化,免疫组化（IHC）检测大鼠脑缺血/再灌注后不同时间点梗死灶周围AQP4的表达,Westernblot及RT-PCR检测AQP4及相关蛋白表达情况。结果 与Sham组相比较,随着再灌注时间增加,I/R模型组大鼠神经功能评分、脑梗死体积、脑组织通透性,脑组织含水量均持续增加,IHC显示AQP4的表达逐渐上调,分布愈加广泛;Westernblot及RT-PCR结果验证了AQP4表达水平的增高趋势,同时对相关蛋白表达检测显示,MMP-9表达增高,Occludin及JAM-1表达显示降低趋势,在I/R-48h模型组表达差异性均最明显（均P〈0.01vsSham）。结论 脑缺血/再灌注后,伴随脑组织损伤的加剧,AQP4与MMP-9表达共同被激活,导致Occludin及JAM-1等TJPs蛋白降解增加,共同参与了脑水肿的形成。Aim To make a research of rats with focal cerebral ischemia/reperfusion injury on pathological changes in brain and the changes of AQP4 and related proteins, in order to explore the relationship between AQP4 and brain edema. Methods Adult male SD rats, weighting 250-300 g, were randomly divided in-to Sham group and cerebral ischemia/reperfusion （ I/R） injury model group. The I/R model group was di-vided into the I/R-6 h, 12 h, 24 h, 48 h-four time point groups. The animal model of the right MCA is-chemia/reperfusion was established by suture method in mature SD rats. The nerve symptom score was con-ducted in the corresponding time points. Then, the permeability of brain tissue was detected by EB stai-ning;TTC staining was conducted to observe the cere-bral infarction volume;the dry wet weight method was used to detect the changes of brain water content; im-munohistochemical（ IHC） , WB and RT-PCR were ap-plied to detect the expression of AQP4 , and the related factors at different time points of the model rats after is-chemia-reperfusion around infarcts. Results Com-pared with the Sham group, then ever function score of the rats in I/R model groups were much higher. With the increase of the reperfusion time, the cerebral in-farction volume, brain tissue permeability and the brain water content were also increased. IHC results showed that AQP4 expression gradually rose with widen distribution. WB and RT-PCR results verified the in-creasing level of AQP4 expression. The detection of the related proteins expression showed apparent changes. The expression of MMP-9 was increased, while the Oc-cludin and JAM-1 expression showed a decreasing trend. The I/R-48 h model group showed the most ob-vious differences in the expression of the related pro-teins and mRNA （ P 〈0. 01 vs Sham, respectively ） . Conclusion Accompanied with the aggravating cere-bral injury after cerebral ischemia/reperfusion, the ex-pression of AQP4 and MMP-9 level were activated, while the degradation of TJPs, Occludin and JAM-1, was incre

关 键 词：缺血/再灌注 脑水肿 AQP4 MMP-9 OCCLUDIN JAM-1 

分 类 号：R-332[医药卫生] R322.81