畜牧兽医学报 ›› 2021, Vol. 52 ›› Issue (6): 1652-1661.doi: 10.11843/j.issn.0366-6964.2021.06.019

• 预防兽医 • 上一篇    下一篇

猪源组织蛋白酶S抑制O型口蹄疫病毒在PK-15细胞复制

史喜绢1,2, 刘原子2, 张大俊2, 侯景2, 申超超2, 杨博2, 张婷2, 袁兴国1, 任瑞瑞2, 杜晓华1*, 张克山2*, 郑海学2, 刘湘涛2   

  1. 1. 甘肃农业大学动物医学院, 兰州 730070;
    2. 中国农业科学院兰州兽医研究所 家畜疫病病原生物学 国家重点实验室 农业部畜禽病毒学重点开放实验室 国家口蹄疫参考实验室, 兰州 730046
  • 收稿日期:2020-09-09 出版日期:2021-06-23 发布日期:2021-06-22
  • 通讯作者: 杜晓华,主要从事动物解剖学与组织学研究,E-mail:duxh@gsau.edu.cn;张克山,主要从事兽医微生物及其分子生物学研究,E-mail:zks009@126.com
  • 作者简介:史喜绢(1994-),女,甘肃平凉人,硕士生,主要从事兽医病毒学研究,E-mail:shixijuan103@163.com
  • 基金资助:
    国家自然科学基金(NSFC-31972684);甘肃省自然科学基金(面上项目20JR5RA582)

Porcine Cathepsin S Inhibits the Replication of Foot-and-Mouth Disease Virus Serotype O in PK-15 Cells

SHI Xijuan1,2, LIU Yuanzi2, ZHANG Dajun2, HOU Jing2, SHEN Chaochao2, YANG Bo2, ZHANG Ting2, YUAN Xingguo1, REN Ruirui2, DU Xiaohua1*, ZHANG Keshan2*, ZHENG Haixue2, LIU Xiangtao2   

  1. 1. College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China;
    2. State Key Laboratory of Veterinary Etiological Biology/Key Laboratory of Animal Virology of Ministry of Agriculture/National Foot-and-Mouth Disease Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agriculture Sciences, Lanzhou 730046, China
  • Received:2020-09-09 Online:2021-06-23 Published:2021-06-22

摘要: 前期研究数据表明组织蛋白酶S(cathepsin S,CTSS)在猪初乳中表达水平显著高于常乳,且CTSS有抑制病毒复制的作用,本研究旨在探究猪源CTSS对O型口蹄疫病毒(foot-and-mouth disease virus serotype O,FMDV-O)复制及对FMDV诱导的抗病毒细胞因子的影响。FMDV-O感染PK-15细胞,利用RT-qPCR和Western blot分别在转录和翻译水平探究FMDV-O感染对内源性CTSS表达的影响;使用CTSS活性检测试剂盒测定FMDV-O感染对CTSS酶活性的影响;根据GenBank公布的CTSS基因序列(XM_021089893.1)构建CTSS真核表达质粒,利用脂质体方法转染PK-15细胞,通过Western blot检测CTSS表达情况,并在此基础上通过Western blot和RT-qPCR检测过表达CTSS对FMDV-O复制及FMDV-O诱导的抗病毒细胞因子mRNA水平的影响;进一步针对CTSS设计合成3对特异性siRNA,利用Western blot和RT-qPCR检测CTSS和FMDV-O的变化。结果表明,FMDV-O感染PK-15细胞能显著上调猪源CTSS表达并增强CTSS酶活性;过表达CTSS能抑制FMDV-O在PK-15细胞中复制,这种抑制作用可能是通过促进FMDV-O诱导的抗病毒细胞因子产生而发挥功能的;干扰序列siRNA-2947下调内源性CTSS表达进而促进FMDV-O的复制。猪源CTSS促进宿主抗病毒细胞因子产生可能是抑制FMDV-O复制的原因之一,本研究为深入探究宿主CTSS在抗FMDV天然免疫应答中的作用及机制提供依据。

关键词: 组织蛋白酶S, FMDV-O, PK-15细胞, 抗病毒功能

Abstract: The previous research data showed that the expression level of cathepsin S (CTSS) in sow colostrum was significantly higher than that of mature milk and CTSS has the effect of inhibiting virus replication. This study aims to explore the effect of pig-derived CTSS on the replication of foot-and-mouth disease virus serotype O (FMDV-O) and the production of antiviral cytokines induced by FMDV-O.PK-15 cells were infected with FMDV-O. The effect of FMDV-O infection on the expression of endogenous CTSS was investigated by RT-qPCR and Western blot at the transcriptional and translational level, respectively, and the effect of FMDV-O infection on the enzyme activity of CTSS in vitro was determined by CTSS activity detection kit. According to the CTSS gene sequence (XM_021089893.1) published by GenBank, the eukaryotic expression plasmid of CTSS was constructed and transfected into PK-15 cells by liposome. The expression of CTSS was detected by Western blot. On this basis, the effect of overexpressed CTSS on FMDV-O replication and the level of antiviral cytokine mRNA induced by FMDV-O was detected by Western blot and RT-qPCR, and three pairs of siRNA specific to CTSS were designed and synthesized. Western blot and RT-qPCR were used to detect the changes of CTSS and FMDV-O. The results showed that PK-15 cells infected with FMDV-O could significantly up-regulate the expression of porcine CTSS and enhance the activity of CTSS enzyme; overexpression of CTSS could inhibit the replication of FMDV-O in PK-15 cells, which may be through promoting the production of antiviral cytokines induced by FMDV-O; the interference sequence siRNA-2947 down-regulated the expression of endogenous CTSS and promoted the replication of FMDV-O. Porcine CTSS promoting the production of host antiviral cytokines may be one of the reasons for inhibiting FMDV-O replication. This study provides a basis for further exploring the role and mechanism of host CTSS in anti-FMDV innate immune response.

Key words: cathepsin S, FMDV-O, PK-15 cell, antiviral function

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