Abstract
Largemouth bass (Micropterus salmoides) is an economically important fish, yet it is plagued by frequent diseases caused by Aeromonas veronii infection in its aquaculture. Vaccination is a pivotal strategy in the prevention and management of infectious diseases, and adjuvants play a crucial role in augmenting the effectiveness of vaccines. Interleukin-8 (IL-8), one of the CXC chemokines, has been identified as having adjuvant potential in various species, although its efficacy in largemouth bass remains uncertain. In the present study, recombinant largemouth bass IL-8 (rLbIL-8) was prepared to explore its adjuvant potential in the A. veronii inactivated vaccine. Challenge experiment results revealed that the relative percent survival (RPS) of largemouth bass in the inactivated A. veronii + rLbIL-8 vaccinated group was calculated to be 70% following challenges with live A. veronii, higher than that of the inactivated A. veronii vaccinated group (56.67%). Furthermore, co-inoculation of rLbIL-8 and inactivated A. veronii markedly elevated serum SOD levels and lysozyme activities in largemouth bass. Indirect ELISA analysis found that rLbIL-8 enhanced the inactivated A. veronii vaccine’s ability to induce serum-specific antibodies against A. veronii. qRT-PCR analysis showed that rLbIL-8 enhanced the upregulation of IL-1β, TNF-α, CD4, MHC II, and IgM expression induced by inactivated A. veronii, with peak expression occurring on days 1 and 5 post-vaccination, respectively. Collectively, these findings attest to the potential of rLbIL-8 as a vaccine adjuvant for largemouth bass, advancing the progress and implementation of vaccines in aquaculture.
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This study was supported by the National Natural Science Foundation of China (No. 32102824).
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by Shun Yang, Qian-Rong Liang, and Ze-Sheng Zhang. Shun Yang, Yu-Hong Yang, and Hui Fei contributed reagents/materials/analysis tools. Conceptualization, formal analysis, methodology, project administration, resources, supervision, visualization, and writing—original draft and editing by Shun Yang, Qian-Rong Liang, Dao-Le Liu, and Xiao-Fei Yao. All authors read and approved the final manuscript.
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The animal experiments in the present study were in strict accordance with the relevant provisions of the welfare ethics and protection of experimental animals in the state and Zhejiang Province. The animal-related experiments were approved and supervised by the Committee of Ethics on Animal Care and Experiments at the Zhejiang Sci-Tech University.
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Yang, S., Liang, QR., Liu, DL. et al. The immunoadjuvant effects of interleukin-8 on Aeromonas veronii inactivated vaccine in largemouth bass (Micropterus salmoides). Aquacult Int (2024). https://doi.org/10.1007/s10499-024-01453-z
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DOI: https://doi.org/10.1007/s10499-024-01453-z