Ang Ⅱ通过刺激肝癌细胞发生上皮间质转换促进肝癌转移
Shijie huaren xiaohua zazhi(2017)
Abstract
目的 探讨肾素-血管紧张素系统(renin angiotensin system,RAS)在肝癌组织中的表达及血管紧张素Ⅱ (angiotensin Ⅱ,Ang Ⅱ)刺激肝癌细胞发生上皮间质转换现象.方法 搜集56例肝癌手术标本,组织标本石蜡切片,免疫组织化学法测定血管紧张素转化酶l(angiotensin converting enzyme l,ACE l)、ACE2、vimentin、ecadherin蛋白表达定量;将细胞分组,用AngⅡ刺激肝癌细胞系,比较不同分组细胞系vimentin、ecadherin蛋白表达差异.结果 与正常组织相比,肝癌组织ACE1、AT1表达上升,上皮间质转化(epithelial mesenchymal transition,EMT)标志物vimentin蛋白表达均上升,ecadherin均下降.Ang Ⅱ刺激下,SSMC7721细胞系的vimentin基因和蛋白表达均上升,ecadherin下降;加入Ang Ⅱ的抑制剂Angl-7后,这种变化受到抑制;加入Angl-7的抑制剂A779后,再次出现vimentin上升,ecadherin表达下降.单独加入A779与对照组差别不大.结论 Ang Ⅱ可能通过刺激肝癌细胞发生EMT对肝癌的转移起到促进作用.
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Key words
Renin-angiotensin-aldosterone system,Hepatocellular carcinoma,Epithelial-mesenchymal transition
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