Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Characterization of Antibody and Enhanced Immune Response by PS-K against Edwardsiella tarda in Loach Misgurnus mizolepis

Edwardsiella tarda에 대한 미꾸라지의 항체 특성과 PS-K의 면역증강효과 분석

  • Jun, Lyu-Jin (Department of Aquatic Life Medicine, College of Fisheries Science, Pukyong National University) ;
  • Lee, Young (National Fisheries Research and Development Institute, Goseong Fisheries Office) ;
  • Kim, Myoung-Sug (National Fisheries Research and Development Institute, Pathology Team) ;
  • Jeong, Hyun-Do (Department of Aquatic Life Medicine, College of Fisheries Science, Pukyong National University)
  • 전려진 (부경대학교 수산생명의학과) ;
  • 이영 (국립수산과학원 고성수산사무소) ;
  • 김명석 (국립수산과학원 병리연구팀) ;
  • 정현도 (부경대학교 수산생명의학과)
  • Published : 2008.11.25
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Abstract

Two different Eelwardsiella tarda isolates, KFE and Edk-2, were obtained from Korea and Japan respectively. On the base of the previous results showing higher pathogenicity of E. tarda KFE compared to that of E. tarda Edk-2 isolate, we tried to determine the differences of antigenicities of these two isolates in loach which is one of the important species in freshwater aquaculture in Korea. Concentration of specific antibody in the serum appeared to be much higher in loach immunized with FKC of E. tarda Edk-2 than those found in loach immunized with FKC of E. tarda KFE. Cross-reaction analysis using agglutination test with normal and antigen-absorbed antisera implied the differences epitopes in the antigens of these E. tarda isolates. For the comparison of bactericidal activity of the produced antibody with different antigens, absorption analysis was performed and confirmed the presence of critical epitopes in the FKC of E. tarda KFE strain. The prophylactic agent, polysaccharide-bound protein (PS-K) injected 1 week before the artificial infection with E. tarda KFE isolates decreased the cumulative mortality in loach and would be on effective method to prevent the occurrence of bacterial infection including E. tarda.

본 연구에서는 우리나라에서 분리된 E. tarda KFE와 일본에서 분리된 E. tarda Edk-2 두 균주의 항혈청을 만들어 생산된 항체의 특성과 방어효과를 분석하고자 하였다. 우리나라에서 많이 양식되어지고 있는 담수어인 미꾸라지를 사용하여 위의 두 가지 분리균주의 항원성에 있어서의 차이점을 조사하고자 하였다. 미꾸라지를 E. tarda 두 균주의 FKC로 각각 면역시킨 후의 혈청내 특이 항체량은 E. tarda KFE 균주로 면역시켰을 때에 비해 E. tarda Edk-2 균주로 면역시켰을 때 훨씬 높은 수치를 나타내었다. 그리고 교차반응 분석에서는 두 균주 간에 공통 항원이 미약하게 존재하는 것을 확인하였으며 미꾸라지 항혈청의 살균효과를 보았을 때에는 두 종류의 항혈청 모두에서 항체의 살균 능력이 있음을 확인하였다. 감염 예방 효과를 가지고 있는 polysaccharide-bound protein (PS-K)을 미꾸라지에 주사한 후 1주째에 E. tarda KFE 분리균주로 공격 실험을 실시하여 본 결과 누적 폐사율이 감소하였으므로, PS-K의 투여는 E. tarda를 포함한 세균성 감염에 대한 효과적인 감염 대책 방안의 하나가 될 수 있음을 확인하였다.

Keywords

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