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南京医科大学学报(自然科学版) 第41卷第9期
·1310 · Journal of Nanjing Medical University(Natural Sciences) 2021年9月
·基础研究·
凋亡抑制蛋白c⁃FLIP(L)调控肺纤维化过程的机制
李 昊,张林凯,张 晶 *
南京大学生命科学学院,江苏 南京 210023
[摘 要] 目的:明确凋亡抑制蛋白c⁃FLIP(L)在肺纤维化过程中的作用,探究其异常表达参与肺纤维化发病的分子机制。方
法:构建博来霉素诱导的小鼠肺纤维化模型,对正常鼠与模型鼠的肺组织切片进行HE和Masson染色观察病理变化,并采用免疫
组化分析c⁃FLIP(L)及上皮⁃间质转化(epithelial⁃mesenchymal transition,EMT)标志分子E⁃cadherin的表达。构建表达c⁃FLIP(L)
的稳定细胞株,qRT⁃PCR 检测EMT标志分子E⁃cadherin、N⁃cadherin 及Vimentin 的mRNA 表达。采用转化生长因子(transform⁃
ing growth factor,TGF)⁃β1诱导细胞发生EMT,通过Smad报告基因检测和Western blot分析c⁃FLIP对TGF⁃β1诱导EMT发生的
影响。结果:c⁃FLIP(L)表达水平在肺纤维化组织中明显升高,与E⁃cadherin表达呈负相关性。C⁃FLIP(L)能促进肺上皮细胞的
EMT 表型,并促进TGF⁃β1诱导的Smad 信号通路激活,而敲减c⁃FLIP(L)表达能阻滞TGF⁃β1诱导的EMT 进程。结论:c⁃FLIP
(L)在肺纤维化过程中高表达能促进EMT发生,是肺纤维化病程发展的促进因素之一。
[关键词] 肺纤维化;EMT;c⁃FLIP;E⁃cadherin
[中图分类号] R364.3 [文献标志码] A [文章编号] 1007⁃4368(2021)09⁃1310⁃06
doi:10.7655/NYDXBNS20210906
The mechanism of c⁃FLIP(L)involved in the development of pulmonary fibrosis
LI Hao,ZHANG Linkai,ZHANG Jing *
School of Life Science,Nanjing University,Nanjing 210023,China
[Abstract] Objective:This study aims to explore the effect of c⁃FLIP(L)in pulmonary fibrosis and its pathological mechanism.
Methods:Based on bleomycin(BLM)induced idiopathic pulmonary fibrosis in mice,the expressions of c⁃FLIP and E⁃cadherin were
analyzed by IHC staining. Further investigations in A549 cells overexpressing c⁃FLIP(L),the expression levels of E⁃cadherin,N⁃
cadherin and Vimentin mRNA were examined by qRT⁃PCR,and Smad activation induced by transforming growth factor(TGF)⁃β1 was
detected by luciferase reporter assay and Western blot. Results:The increased c⁃FLIP expression was observed and associated with a
decrease of E⁃cadherin expression. C⁃FLIP(L)overexpression resulted in the changes on E⁃cadherin,N⁃cadherin and Vimentin
expressions in A549 cells. Furthemore,overexpression of c⁃FLIP(L)enhanced TGF⁃β⁃induced Smad activation,and knocking down
c⁃FLIP(L)blocked the TGF⁃β1⁃induced EMT progress. Conclusion:C⁃FLIP(L)may be a promoting factor in the development of
fibrosis via regulating EMT progress.
[Key words] pulmonary fibrosis;EMT;c⁃FLIP;E⁃cadherin
[J Nanjing Med Univ,2021,41(09):1310⁃1314,1341]
特发性肺纤维化(idiopathic pulmonary fibrosis, 存活率仅为 20%,目前尚无治愈方法 。目前认为
[2]
IPF)是困扰人类的一种顽症,被定义为一种病因不 肺纤维化的发展主要分为 2 个阶段:①早期肺泡炎
[1]
明、发病机制不清的弥散性肺间质疾病 。近年来, 症阶段,肺部浸润细胞和间质细胞会分泌一系列细
肺纤维化在国内外的发病率呈显著上升趋势,已成为 胞 因 子 ,如 肿 瘤 坏 死 因 子(tumor necrosis factor,
全球范围内关注的健康问题。IPF预后差,患者5年 TNF)⁃α、趋化因子 CXC 等,促进炎性细胞进一步聚
集;②后期纤维化阶段,活化的间质细胞(成纤维细
[基金项目] 江苏省自然科学基金面上项目(BK20161477) 胞和成肌纤维细胞)及炎症细胞会分泌生长因子
∗ [如转化生长因子⁃β(transforming growth factor⁃β,
通信作者(Corresponding author),E⁃mail:jzhang08@nju.edu.cn