Combination of specific single chain antibody variable fragment and siRNA has a synergistic inhibitory effect on the propagation of avian influenza virus H5N1 in chicken cells

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• 作者：Shuang Wang (1)
  Peng Zhang (2)
  Fei He (1)
  Ji-Gui Wang (1)
  Jia-Zeng Sun (1)
  Zhi-Li Li (1)
  Bao Yi (1)
  Ji Xi (1)
  Ya-Ping Mao (1)
  Qiang Hou (1)
  Dao-Li Yuan (1)
  Zi-Ding Zhang (1)
  Wei-Quan Liu (1)
  
  1. State Key Laboratory of Agrobiotechnology ; Department of Biochemistry and Molecular Biology ; College of Biological Sciences ; China Agricultural University ; Beijing ; 100193 ; China
  2. State Key Laboratory of Brain and Cognitive Sciences ; Institute of Biophysics ; Chinese Academy of Sciences ; Beijing ; 100101 ; China
  
• 关键词：AIV H5N1 ; scFv ; siRNA ; Synergistic inhibitory effect
• 刊名：Virology Journal
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：11
• 期：1
• 全文大小：2,801 KB
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• 刊物主题：Virology;
• 出版者：BioMed Central
• ISSN：1743-422X

文摘

Background The avian influenza virus (AIV) causes frequent disease with high morbidity and mortality. RNA interference (RNAi) has been shown to provide an effective antiviral defense in animals, and several studies have focused on harnessing small interfering RNAs (siRNAs) to inhibit viral infections. In addition, single chain variable fragments (scFvs) contain the complete antigen binding site, and specific scFvs can bind to and neutralize viruses. Results Fourteen positive scFvs were selected by the yeast two-hybrid system. Using molecular docking technology, we selected the three highest affinity scFvs for further functional validation. Results of indirect ELISA and IFA showed that all three scFvs could bind to FJ13 strain and had neutralizing activity, decreasing the viral infectivity markedly. Chicken fibroblastic DF-1 cells were transfected with scFvs in combination with siRNA-NP604 (an siRNA of anti-AIV NP protein previously reported). Following infection with FJ13 virus, copy numbers of the virus were significantly reduced from 12 h to at least 60 h post-infection compared to that achieved in cells transfected with scFv or siRNA-NP604 separately. Conclusions A novel combination of antiviral siRNAs expressed in chicken cells and chicken antibody single-chain variable fragments (scFvs) secreted from the cells has a synergistic inhibitory effect on the avian influenza viral proliferation in vitro. Intracellular application of scFvs and anti-viral siRNA may provide a new approach to influenza prevention and treatment.