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KMID : 0893420210220020015
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Journal of Veterinary Science
2021 Volume.22 No. 2 p.15 ~ p.15
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Protective efficacy of attenuated Salmonella Typhimurium strain expressing BLS, Omp19, PrpA, or SOD of Brucella abortus in goats
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Leya Mwense
Kim Won-Kyong
Ochirkhuyag Enkhsaikhan
Yu Eun-Chae
Kim Young-Jee
Yeo Yoon-Hwan
Yang Myeon-Sik
Han Sang-Seop
Lee John-Hwa
Tark Dong-Seob
Hur Jin
Kim Bum-Seok
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Abstract
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Background: Attenuated Salmonella strain can be used as a vector to transport immunogens to the host antigen-binding sites.
Objectives: The study aimed to determine the protective efficacy of attenuated Salmonella strain expressing highly conserved Brucella immunogens in goats.
Methods: Goats were vaccinated with Salmonella vector expressing individually lipoprotein outer-membrane protein 19 (Omp19), Brucella lumazine synthase (BLS), proline racemase subunit A (PrpA), Cu/Zn superoxide dismutase (SOD) at 5 × 109 CFU/mL and challenge of all groups was done at 6 weeks after vaccination.
Results: Among these vaccines inoculated at 5 × 109 CFU/mL in 1 mL, Omp19 or SOD showed significantly higher serum immunoglobulin G titers at (2, 4, and 6) weeks post-vaccination, compared to the vector control. Interferon-γ production in response to individual antigens was significantly higher in SOD, Omp19, PrpA, and BLS individual groups, compared to that in the vector control (all p < 0.05). Brucella colonization rate at 8 weeks post-challenge showed that most vaccine-treated groups exhibited significantly increased protection by demonstrating reduced numbers of Brucella in tissues collected from vaccinated groups. Real-time polymerase chain reaction revealed that Brucella antigen expression levels were reduced in the spleen, kidney, and parotid lymph node of vaccinated goats, compared to the non-vaccinated goats. Besides, treatment with vaccine expressing individual antigens ameliorated brucellosis-related histopathological lesions.
Conclusions: These results delineated that BLS, Omp19, PrpA, and SOD proteins achieved a definite level of protection, indicating that Salmonella Typhimurium successfully delivered Brucella antigens, and that individual vaccines could differentially elicit an antigen-specific immune response.
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KEYWORD
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Brucellosis, vaccine, Salmonella, goat
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