Clinical and Experimental Vaccine Research

The Korean Vaccine Society (대한백신학회)
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Development of dual reporter imaging system for Francisella tularensis to monitor the spatiotemporal pathogenesis and vaccine efficacy

  • Kim, Young-Hwa (Department of Nuclear Medicine, Cancer Research Institute, Seoul National University College of Medicine) ;
  • Park, Pil-Gu (Department of Microbiology, Yonsei University College of Medicine) ;
  • Seo, Sang-Hwan (International Vaccine Institute) ;
  • Hong, Kee-Jong (Interpark Bio-Convergence Center) ;
  • Youn, Hyewon (Department of Nuclear Medicine, Cancer Research Institute, Seoul National University College of Medicine)
  • Received : 2018.07.30
  • Accepted : 2018.08.02
  • Published : 2018.07.31
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Abstract

Purpose: Study on the pathogen and the pathogen-related disease require the information at both cellular and organism level. However, lack of appropriate high-quality antibodies and the difference between the experimental animal models make it difficult to analyze in vivo mechanism of pathogen-related diseases. For more reliable research on the infection and immuneresponse of pathogen-related diseases, accurate analysis is essential to provide spatiotemporal information of pathogens and immune activity to avoid false-positive or mis-interpretations. In this regards, we have developed a method for tracking Francisella tularensis in the animal model without using the specific antibodies for the F. tularensis. Materials and Methods: A dual reporter plasmid using GFP-Lux with putative bacterioferritin promoter (pBfr) was constructed and transformed to F. tularensis live vaccine strain to generate F. tularensis LVS (FtLVS)-GFP-Lux for both fluorescence and bioluminescence imaging. For vaccination to F. tularensis infection, FtLVS and lipopolysaccharide (LPS) from FtLVS were used. Results: We visualized the bacterial replication of F. tularensis in the cells using fluorescence and bioluminescence imaging, and traced the spatio-temporal process of F. tularensis pathogenesis in mice. Vaccination with LPS purified from FtLVS greatly reduced the bacterial replication of FtLVS in animal model, and the effect of vaccination was also successfully monitored with in vivo imaging Conclusion: We successfully established dual reporter labeled F. tularensis for cellular and whole body imaging. Our simple and integrated imaging analysis system would provide useful information for in vivo analysis of F. tularensis infection as well as in vitro experiments, which have not been fully explained yet with various technical problems.

Keywords

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