| Immunogenicity of staphylococcal enterotoxin C mutant antigen in mice and dairy cows |
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Byoung-sun Chang1, Yi-seok Joo2, Jin-san Moon2, Keun-seok Seo3, Soo-jin Yang3, So-hyun Kim3, Yong-ho Park3 |
1LG Chemical LTD.
2National Veterinary Research and Quarantine Service
3Department of Microbiology, College of Veterinary Medicine, School of Agricultural Biotechnology, Seoul National University |
| 포도상구균 장내 C 형 변이독소 (SEC mutant)의 면역원성에 대한 연구 |
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장병선1, 주이석2, 문진산2, 서근석3, 양수진3, 김소현3, 박용호3 |
1LG 화학
2국립수의과학검역원
3서울대학교 수의과대학 미생물학 교실 및 농생명공학부 |
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| Abstract |
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Mastitis is one of the most significant cause of economic loss to the dairy industry. Especially, Staphylococcus aureus is a major contagious mastitis-causing pathogen in dairy cattle. Because of its high transmission rate and resistance to antibiotic therapy, staphylococcal mastitis presents a constant threat to the dairy industry. Staphylococcal enterotoxin C(SEC) produced by S aureus has been known as one of superantigens which are able to stimulate a large proportion of T lymphocytes independently of their antigenic specificity. In this experiment, we have conducted preliminary studies with mice and lactating cows to evaluate the immunogenicity and safety of the experimental vaccine consists of SEC mutant antigen on controlling the bovine mastitis associated with S aureus infections. The average value of somatic cell counts in quarter milk, isolation rate of S aureus were consistently decreased in SEC-SER vaccinated groups, whereas antibody titers were highly increased in SEC-SER vaccinated groups. Peripheral blood were also collected from the lactating cows to determine the proportion of leukocyte subpopulation associated with humoral immunity(HI) and cell mediated immunity(CMI). Proportion of leukocyte subpopulation expressing $BoCD2^+$(total T lymphocyte), $BoCD4^+$(T helper cell), $BoCD8^+$(T cytotoxic/suppressor cell) and NonT/NonB lymphocyte which are involved in CMI in SEC-SER vaccinated groups were decreased for the initial stage after first vaccination and then increased from ten weeks after first vaccination maintaining elevated level till 14 weeks after vaccination. In contrast, proportion of monocyte, MHC class II and B lymphocyte which are associated with the production of primary immune response in SEC-SER vaccinated groups were increased for the initial period and then decreased from ten weeks after first vaccination. We present evidence that vaccination of SEC-SER mutant antigen in lactating cows induced a significant proliferation of bovine T lymphocytes. These results suggest that SEC-SER mutant antigen used in this experiment might be one of potential immunogen in developing innovative vaccine against bovine IMI associated with S aureus. Additional challenge trials should be carried out to evaluate substantial protection against S aureus under the commercial farm conditions. |
| Key Words:
Staphylococcal enterotoxin type C mutant(SEC mutant), immunogenicity |
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