畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (8): 1658-1666.doi: doi: 10.11843/j.issn.0366-6964.2016.08.017

• 基础兽医 • 上一篇    下一篇

外源性绵羊肺腺瘤病毒囊膜蛋白激活MAPK信号通路的分析

孙晓林1,杜方原1,刘淑英1,2   

  1. (1.内蒙古农业大学兽医学院,呼和浩特 010018;2.农业部动物临床诊疗技术重点实验室,呼和浩特 010018)
  • 收稿日期:2016-03-28 出版日期:2016-08-23 发布日期:2016-09-08
  • 通讯作者: 刘淑英,教授,博士生导师,E-mail:liushuying_imau@126.com
  • 作者简介:孙晓林(1989-),女,内蒙古呼伦贝尔人,博士生,主要从事动物生殖内分泌与病毒病理学的研究,E-mail:732121783@qq.com
  • 基金资助:

    国家自然基金(31360597);内蒙古科技厅应用研究项目(201502070);内蒙古草原英才创新团队项目(20151031)

Recombinant Plasmid pcDNA4/myc-His/exJSRV-env Transiently Transfect A549 Cells and Detect the Activation of MAPK Signal Transduction Pathway

SUN Xiao-lin 1,DU Fang-yuan1 ,LIU Shu-ying 1,2*   

  1. (1.College of Veterinary Medicine,Inner Mongolia Agricultural University,Huhhot 010018,China;2.Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease of Ministry of Agriculture,Huhhot 010018,China)
  • Received:2016-03-28 Online:2016-08-23 Published:2016-09-08

摘要:

旨在深入探究外源性绵羊肺腺瘤病毒(exJSRV)囊膜蛋白(Env)的致病机制,通过组织病理学观察和免疫组织化学染色,检测病肺的病理特征以及Env、EGFR和MAPK信号通路中p-Erk1/2和p-p38的阳性表达区,通过Western blot检测Erk1/2和p38在病肺中的磷酸化水平。转染重组表达质粒pcDNA 4/myc-His /exJSRV-env到A549细胞中,通过Western blot检测Erk1/2和p38的磷酸化水平。通过CCK-8法检测转染重组表达质粒的A549细胞的增殖活力。免疫组化结果显示:JSRV Env蛋白主要表达于病肺组织的肺泡上皮细胞和肿瘤细胞,EGFR在病肺组织中过表达于肺泡上皮细胞,脱落的肿瘤细胞及间质细胞中,而在健康绵羊肺中只是少量表达于肺泡上皮细胞和支气管上皮细胞中,p-Erk1/2和p-p38在病肺组织中主要表达于肺泡上皮细胞和肿瘤细胞,EGFR、p-Erk1/2和p-p38的阳性表达区均与Env蛋白的阳性表达区一致。Western blot结果显示:病肺中p-Erk1/2和p-p38的磷酸化水平均极显著高于健康肺组织,转染重组表达质粒pcDNA4/myc-His/exJSRV-env的A549细胞中p-Erk1/2和p-p38的表达量均极显著高于对照组细胞,说明exJSRV-env确实激活了A549细胞的MAPK通路。而CCK8结果显示:转染重组表达质粒pcDNA4/myc-His/exJSRV-env的A549细胞增殖活力显著高于对照组细胞,说明exJSRV-env可能是通过激活的EGFR/MAPK通路促进A549细胞的恶性增殖,进而促使肿瘤的发生。本研究为进一步探索绵羊肺腺瘤病毒囊膜蛋白的致病机制奠定了基础。

关键词: 外源性绵羊肺腺瘤病毒, 囊膜蛋白, MAPK信号转导通路, 细胞增殖

Abstract:

In order to explore the pathogenesis of exJSRV Env,by the means of the pathology observation and immunohistochemistry,we detected the pathological characteristics and the positive regions of Env,EGFR,p-Erk1/2 and p-p38 in OPA (ovine pulmonary adenomatosis) sheep lung.Then we detected the relative expressions of p-Erk1/2 and p-p38 in sheep lung and in A549 cells after transiently transfecting recombinant plasmid pcDNA4/myc-His/exJSRV-env by Western blot.Finally we detected the proliferation activity of the cells with recombinant plasmid by CCK-8.Immunohistochemistry results revealed that infected lung cells expressed Env in alveolar epithelial cells and tumor cells;EGFR in alveolar epithelial cells,tumor cells slipping off and interstitial cells but less expressed in alveolar epithelial cells and bronchial epithelial cells in normal sheep lung;p-Erk1/2 and p-p38 in alveolar epithelial cells and tumor cells.Western blot results showed that the activation of p-Erk and p-p38 in OPA sheep lung were higher than normal sheep lung.The relative expressions of p-Erk and p-p38 in the A549 cells with recombinant plasmid were higher than control cells.And CCK8 showed that the proliferation activity of the cells with recombinant plasmid were higher than the control cells.We conclude that exJSRV Env activated EGFR/MAPK signal transduction pathway in A549 cells,and possibly promoted the malignant cell proliferation by this pathway and tumorigenesis.We provide a platform for the pathogenesis of JSRV Env.

Key words: exJSRV, envelope protein, MAPK signal transduction pathway, cell proliferation

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