Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Induction of Immune Responses by Two Recombinant Proteins of Brucella abortus, Outer Membrane Proteins 2b Porin and Cu/Zn Superoxide Dismutase, in Mouse Model

  • Sung, Kyung Yong (Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University) ;
  • Jung, Myunghwan (Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University) ;
  • Shin, Min-Kyoung (Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University) ;
  • Park, Hyun-Eui (Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University) ;
  • Lee, Jin Ju (College of Veterinary Medicine, Gyeongsang National University) ;
  • Kim, Suk (College of Veterinary Medicine, Gyeongsang National University) ;
  • Yoo, Han Sang (Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University)
  • Received : 2013.12.24
  • Accepted : 2014.03.06
  • Published : 2014.06.28
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Abstract

The diagnosis of Brucella abortus is mainly based on serological methods using antibody against LPS, which has diagnostic problems. Therefore, to solve this problem, we evaluated two proteins of B. abortus, Cu/Zn superoxide dismutase (SodC) and outer membrane proteins 2b porin (Omp2b). The genes were cloned and expressed in a pMAL system, and the recombinant proteins, rOmp2b and rSodC, were purified as fusion forms with maltose-binding protein. The identity of the proteins was confirmed by SDS-PAGE and Western blot analysis with sera of mice infected with B. abortus. Production of cytokines and nitric oxide (NO) was investigated in RAW 264.7 cells and mouse splenocytes after stimulation with the proteins. Moreover, cellular and humoral immune responses were investigated in BALB/c mice after immunization with the proteins. TNF-${\alpha}$, IL-6, and NO were significantly inducible in RAW 264.7 cells. Splenocytes of naive mice produced IFN-${\gamma}$ and IL-4 significantly by stimulation. Moreover, number of IgG, IFN-${\gamma}$, and IL-4 producing cells were increased in immunized mice with the two proteins. Production of IgG and IgM with rOmp2b was higher than those with rSodC in immunized mice. These results suggest that the two recombinant proteins of B. abortus may be potential LPS-free proteins for diagnosis.

Keywords

References

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