J Vet Sci.  2006 Dec;7(4):361-368. 10.4142/jvs.2006.7.4.361.

Effects of DDA, CpG-ODN, and plasmid-encoded chicken IFN-gamma on protective immunity by a DNA vaccine against IBDV in chickens

Affiliations
  • 1School of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 200-701, Korea. kwonhm@kangwon.ac.kr

Abstract

This study examined the adjuvant effects of dimethyl dioctadecyl ammonium bromide (DDA), CpG oligodeoxynucleotides (CpG-ODN), and chicken interferon-gamma (ChIFN-gamma) on a DNA vaccine (pcDNA-VP243) against the infectious bursal disease virus (IBDV). A plasmid encoding chicken IFN-atilde was constructed. Twice at 2-week intervals, twoweek-old chickens were injected intramuscularly and intraperitoneally with either a DNA vaccine alone or a DNA vaccine together with the respective adjuvants. On week 2 after the second immunization, the chickens were orally challenged with the highly virulent IBDV. The groups that received the DNA vaccines plus either DDA or CpG-ODN showed significantly lower survival rates than the group that received the DNA vaccine alone. However, the survival rates for the DNA vaccine alone and for the DNA vaccine plus ChIFN-gamma were similar. The chickens had no detectable antibodies to the IBDV before the challenge but all the surviving chickens in all groups except for the normal control group showed the induction of antibodies to the IBDV at day 10 after the challenge. As judged by the lymphocyte proliferation assays using the a WST-8 solution performed on the peripheral blood and splenic lymphocytes, the stimulation indices (SI) of the peripheral blood lymphocytes in all groups except for the normal control group were similar immediately before the challenge. At 10 days post-challenge, the SI for DNA vaccine plus either CpG-ODN or ChIFN-gamma was similar to that of the DNA vaccine control group. For splenic lymphocytes, the SI in the DNA vaccine plus CpG-ODN and DNA vaccine plus ChIFN-gamma groups were higher than for the DNA vaccine control. These results suggest that DDA actually compromises the protection against the IBDV by DNA vaccine, and CpG-ODN and IFN-gamma had no significant effect.

Keyword

chicken IFN-gamma; CpG-ODN; DDA; DNA vaccine; infectious bursal disease virus

MeSH Terms

Adjuvants, Immunologic
Animals
Antibodies, Viral/blood
Birnaviridae Infections/*immunology/*prevention & control/virology
Bursa of Fabricius/immunology/virology
Cell Proliferation
Chickens
CpG Islands/immunology
Enzyme-Linked Immunosorbent Assay/veterinary
Immunization/methods/*veterinary
Infectious bursal disease virus/*immunology
Interferon-gamma/immunology/therapeutic use
Lymphocytes/cytology/immunology
Oligonucleotides/immunology
Poultry Diseases/immunology/*prevention & control/*virology
Specific Pathogen-Free Organisms
Vaccines, DNA/immunology/therapeutic use
Viral Vaccines/*immunology/therapeutic use
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