Efficacy of Genetic Adjuvant (Plasmid-Expressed Chicken Interleukin-6) and Chemical Adjuvant (Levamisole) on the Protective Immunity of Genetic Vaccine against Infectious Bursal Disease Virus

닭의 전염성 F낭병 바이러스 유전자백신에 의한 방어 면역에 Genetic Adjuvant (Chicken Interleukin-6)와 Chemical Adjuvant (Levamisole)의 효과

  • Park, Jeong-Ho (School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Sung, Haan-Woo (School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Yoon, Byung-Il (School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Pak, Son-Il (School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Kwon, Hyuk-Moo (School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University)
  • 박정호 (강원대학교 수의학부대학 및 동물의학종합연구소) ;
  • 성환우 (강원대학교 수의학부대학 및 동물의학종합연구소) ;
  • 윤병일 (강원대학교 수의학부대학 및 동물의학종합연구소) ;
  • 박선일 (강원대학교 수의학부대학 및 동물의학종합연구소) ;
  • 권혁무 (강원대학교 수의학부대학 및 동물의학종합연구소)
  • Received : 2009.05.08
  • Accepted : 2009.06.04
  • Published : 2009.06.30

Abstract

Infectious bursal disease (IBD) caused by the infectious bursal disease virus (IBDV) has an important economic impact on the poultry industry worldwide. This study examined the adjuvant effects of a plasmid encoding chicken interleukin-6 (pcDNA-ChIL-6) and levamisole (LMS) on in ovo prime-boost vaccination using a genetic vaccine (pcDNA-VP243) to prime in chicken followed by a killed-vaccine boost. A pcDNA-VP243 was injected into the amniotic sac alone or in combination with a pcDNA-ChIL-6 or LMS at embryonation day 18, followed by an intramuscular injection of killed IBD vaccine at 1 week of age. The chicken were orally challenged with very virulent IBDV (vvIBDV) strain at 3 weeks of age and observed for 10 days. No mortality was observed in the groups that received the pcDNA-VP243 alone and pcDNA-VP243 plus pcDNA-ChIL-6 or LMS compared to 100% mortality in unvaccinated challenge control group. However, as determined by bursal damage (the presence of IBDV RNA, B/B ratio, and lesion score), a pcDNA-VP243 alone group was superior to pcDNA-VP243 plus pcDNA-ChIL-6 or LMS groups in the protection against post-challenge. These findings suggest that in ovo priming with genetic vaccine and boosting with killed vaccine is an effective strategy for protecting chicken against vvIBDV and the addition of pcDNA-ChIL-6 or LMS did not enhance protective immunity.

닭의 전염성 F낭병 바이러스(IBDV)가 원인 바이러스인 전염성 F낭병은 전 세계 양계산업에 경제적으로 피해가 큰 중요한 질병이다. 이 연구의 목적은 닭에서 IBDV에 대한 방어면역을 유도하기 위한 in ovo 초회항원자극(priming)과 불활화백신에 의한 보강접종 방법에 항원보강제(adjuvant)로 chicken interleukin 6 (pcDNA-ChIL-6;plasmid encoding chicken interleukin-6)와 levamisole (LMS)의 효과를 조사하는 것이다. IBDV의 VP2, VP, VP3 protein을 암호화하는 유전자백신인 plasmid DNA vaccine (pcDNA-VP243) 단독 또는 pcDNA-ChIL-6 또는 LMS와 함께 18일령 부화란의 양막낭(amniotic sac)에 접종하고 부화한 1주령의 병아리에 불활화 IBD 백신을 근육 접종한 다음 3주령에 고병원성 IBDV인 SH/92 주로 공격 접종하고 10일 동안 관찰하였다. 백신하지 않은 공격접종 대조군이 100%의 폐사율을 보인 반면 pcDNA-VP243 단독 접종군과 pcDNA-VP243에 pcDNA-ChIL-6 또는 LMS를 첨가한 실험군은 모두 100%의 생존율을 나타내었다. 그러나 공격접종 후 F낭의 손상을 평가하기 위한 IBDV RNA의 검출, B/B ratio와 F낭의 병변지수(lesion score) 등을 분석한 결과 pcDNA-VP243에 pcDNA-ChIL-6 또는 LMS를 첨가한 실험군은 pcDNA-VP243 단독 접종군보다 향상된 방어효과를 나타내지 않았다. 이 실험결과는 유전자백신에 의한 in ovo 초회항원자극-불활화백신에 의한 보강접종법이 고병원성 IBDV로부터 닭을 보호하기 위한 효과적인 방법이었으나 pcDNA-ChIL-6 또는 LMS의 첨가로 인한 방어효과의 향상은 나타나지 않았다.

Keywords

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