基础医学与临床 ›› 2014, Vol. 34 ›› Issue (1): 47-52.

• 研究论文 • 上一篇    下一篇

Ezrin介导中性粒细胞弹性蛋白酶诱导的人气道上皮细胞株分泌黏蛋白增加

李琪1,李娜2,尤列.皮尔曼3,维克多.科罗索夫3,周向东4   

  1. 1. 重庆医科大学 第二附属医院 呼吸内科
    2. 重庆医科大学
    3. 俄罗斯医学科学院 远东呼吸生理与病理研究中心
    4. 重庆医科大学附属第二医院 呼吸内科
  • 收稿日期:2013-05-06 修回日期:2013-07-22 出版日期:2014-01-05 发布日期:2013-12-26
  • 通讯作者: 周向东 E-mail:zxd999@263.net
  • 基金资助:
    慢性气道炎症发生黏液爆发式分泌的分子链接机制;节律性压力波维持气道上皮黏液层稳态的信号链接基础;Ezrin在气道黏液爆发式胞吐分泌过程中的内在分子效应机制;膜-骨架连接蛋白Ezrin在气道黏液爆发式分泌中的效应基础

Ezrin Mediates Neutrophil Elastase-induced MUC5AC Secretion in Human Airway Epithelial Cells

  • Received:2013-05-06 Revised:2013-07-22 Online:2014-01-05 Published:2013-12-26
  • Contact: Xiang-dong Zhou E-mail:zxd999@263.net

摘要: 目的 探讨膜连接蛋白Ezrin在中性粒细胞弹性蛋白酶(NE)诱导气道黏液高分泌的作用及相关调节机制。方法 以中性粒细胞弹性蛋白酶刺激培养的人气道上皮HBE16细胞,ELISA法、real-time PCR法测定刺激黏蛋白(MUC)5AC的蛋白及mRNA水平。免疫荧光法检测Ezrin蛋白含量。 结果 NE刺激30 min后MUC5AC mRNA表达增强,细胞中及培养上清中黏蛋白MUC5AC的含量均显著高于对照组(P<0.01);转染Ezrin永久磷酸化载体pEGFP-N1-Ezrin-T567D的细胞经NE刺激后,胞质内磷酸化Ezrin表达明显增强,且胞膜分布增多。同时,细胞培养上清液中的MUC5AC蛋白含量亦显著高于单纯NE组(P<0.01)。遏制Ezrin磷酸化pEGFP-N1-Ezrin-T567A载体转染组在NE刺激后,Ezrin蛋白与pEGFP-N1-Ezrin-T567D组相比有明显减少,且未出现向胞膜聚集的趋势,同时分泌至培养上清的MUC5AC蛋白也有明显减少(P<0.01),同时伴随胞浆内MUC5AC蛋白有所增加(P<0.05)。结论 Ezrin蛋白参与了NE诱导的MUC5AC蛋白分泌,是气道上皮细胞MUC5AC分泌的重要调控分子。

关键词: 黏蛋白类, 分泌, 白细胞弹性蛋白酶, Ezrin

Abstract: Objective To explore the role of Ezrin in neutrophil elastase (NE)-induced mucin (MUC)5AC production in human HBE16 airway epithelial cells.Methods The HBE16 airway epithelial cells were cultured,transfected with pEGFP-N1-Ezrin-T567D and pEGFP-N1-Ezrin-T567A, respectively, then each group was treated with 0.5 μmol/L NE.The levels of MUC5AC protein in culture medium,MUC5AC protein in cytoplasm,MUC5AC mRNA, and Ezrin protein in culture cells were detected with ELISA,real time-PCR,and immunofluorescence, respectively.Results There was an obvious increasing of MUC5AC protein production and mRNA expression in cells exposed to NE,with elevation of Ezrin protein,all had significant differences when compared with normal control group.Cell transfected with pEGFP-N1-Ezrin-T567D increased MUC5AC secretion in culture medium,P<0.01,compared with single NE-stimulated cells. Ezrin protein were increased, and manily concentrated in cytoplasmic membranes,P<0.05,compared with single NE-stimulated cells. pEGFP-N1-Ezrin-T567A restrained Ezrin expression in cells and decreased MUC5AC protein in culture medium.Conclusion Ezrin is involved in NE-mediated MUC5AC protein secretion but not MUC5AC mRAN expression in HBE16 cells. The phosphrylation of Thr567 site in Ezrin may play a critical role.

Key words: Mucins, secretion, Leukocyte elastase, Ezrin

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