Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (6): 1391-1398.doi: 10.11843/j.issn.0366-6964.2020.022

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Generation of Genotype Ⅰ Japanese Encephalitis Virus Virus-like Particles and Evaluation of Its Immunogenicity in Mice

SHI Lei1, ZHOU Yahong1, TIAN Zhancheng1*, GAO Shandian1, DU Junzheng1, GUAN Guiquan1, LIU Guangyuan1, LUO Jianxun1, YIN Hong1,2*   

  1. 1. State Key Laboratory of Veterinary Etiological Biology/Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China;
    2. Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
  • Received:2019-12-03 Online:2020-06-25 Published:2020-06-23

Abstract: Decreasing the circulation of the Japanese encephalitis virus (JEV) in pigs is critical for blocking JEV infection in human. In view of the urgency of JE prevention and control in China and the uncertainty of the commercial Genotype Ⅲ JEV attenuated vaccine to the immuno-protection of partial Genotype Ⅰ JEV (GⅠ JEV) endemic strains, it is urgent to develop a safe, effective and low-cost GⅠ JEV vaccine for pigs. The expression cassette of JEV prME gene was cloned into the baculovirus shuttle vector to generate a recombinant bacmid (Bacmid-prME), the recombinant baculovirus was produced by transfecting Sf9 cells with Bacmid-prME. The accurate expression of the recombinant prME protein was confirmed by Western blot and immunofluorescence analysis, and the formation of Virus-Like Particles (VLPs) was verified through observing under Electronic microscopy. The immunogenicity of GⅠ JEV VLPs was further evaluated in mice. The recombinant prME protein was efficiently expressed in Sf9 cells and assembled into VLPs. GⅠ JEV VLPs induced the higher neutralizing antibody titer in mice. In our study, GⅠ JEV VLPs obtained in the baculovirus expression system provides a material basis for the development of a safe and effective JEV subunit vaccine.

Key words: Japanese encephalitis virus, baculovirus, virus-like particles, immunogenicity

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