The HSP70 and IL‐1β of Nile tilapia as molecular adjuvants can enhance the immune protection of DNA vaccine against Streptococcus agalactiae infection

Globally, streptococcal disease caused by Streptococcus agalactiae is known for its high mortality rate, which severely limits the development of the tilapia breeding industry. As a third‐generation vaccine, DNA vaccines have shown great application prospects in the prevention and control of aquatic...

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Bibliographic Details
Published in:Journal of fish diseases 2024-11, Vol.47 (11), p.e14002-n/a
Main Authors: Xu, Fei‐Fan, Deng, Zhu‐Yang, Sheng, Jun‐Jie, Zhu, Bin
Format: Article
Language:English
Subjects:
Adjuvants
Bacteria
Deoxyribonucleic acid
Disease control
DNA
DNA vaccine
DNA vaccines
Effectiveness
Enzymatic activity
Enzyme activity
Freshwater fishes
Gene expression
Hsp70 protein
immune protection
Immunization
Immunogenicity
Immunoglobulin M
Industrial development
molecular adjuvant
Plasmids
Recombinants
Streptococcus agalactiae
Streptococcus infections
surface immunogenic protein
Tilapia
Vaccines
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Summary:Globally, streptococcal disease caused by Streptococcus agalactiae is known for its high mortality rate, which severely limits the development of the tilapia breeding industry. As a third‐generation vaccine, DNA vaccines have shown great application prospects in the prevention and control of aquatic diseases, but their low immunogenicity limits their development. The combination of DNA vaccines and molecular adjuvants proved to be an effective method for inducing protective immunity. This study constructed recombinant plasmids encoding tilapia HSP70 and IL‐1β genes (pcHSP70 and pcIL‐1β) to verify their effectiveness as molecular adjuvants for S. agalactiae DNA vaccine (pcSIP) in the immunized tilapia model. The results revealed that serum‐specific IgM production, enzyme activities, and immune‐related gene expression in tilapia immunized with pcSIP plus pcHSP70 or pcIL‐1β were significantly higher than those in tilapia immunized with pcSIP alone. It is worth noting that combination with molecular adjuvants improved the immune protection of DNA vaccines, with a relative percentage survival (RPS) of 51.72% (pcSIP plus pcHSP70) and 44.83% (pcSIP plus pcIL‐1β), respectively, compared with that of pcSIP alone (24.14%). Thus, our study indicated that HSP70 and IL‐1β in tilapia are promising molecular adjuvants of the DNA vaccine in controlling S. agalactiae infection.
ISSN:0140-7775
1365-2761
1365-2761
DOI:10.1111/jfd.14002