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DNA vaccine dual-expressing viral hemorrhagic septicemia virus glycoprotein and C-C motif chemokine ligand 19 induces the expression of immune-related genes in zebrafish (Danio rerio)

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Abstract

Glycoprotein (G protein)-based DNA vaccines are effective in protecting aquaculture fish from rhabdoviruses but the degree of immune response they elicit depends on plasmid concentration and antigen cassette. Here, we developed a DNA vaccine using the viral hemorrhagic septicemia virus G (VG) gene and chemokine (C−C motif) ligand 19 (CCL19)a.2 regulated by the CMV promoter as the molecular adjuvant. After transfection of the prepared plasmid (pVG + CCL19) into epithelioma papulosum cyprini cells, mRNA expression was confirmed through quantitative real-time polymerase chain reaction. The vaccine was intramuscularly injected into zebrafish (Danio rerio), and 28 days after immunization, viral hemorrhagic septicemia virus (105 TCID50/10 µl/fish) was intraperitoneally injected. A survival rate of 68% was observed in the pVG + CCL19 group but this was not significantly different from the survival rate of fish treated with pVG alone, that is, without the adjuvant. However, the expression of interferon- and cytokine-related genes in the spleen and kidney tissues of zebrafish was significantly increased (p < 0.05) on days 1, 3, 7, and 14 after immunization. Thus, CCL19a.2 induced an initial immune response as a molecular adjuvant, which may provide initial protection against virus infection before vaccination-induced antibody formation. This study provides insights on the functions of CCL19a.2 adjuvant in DNA vaccines.

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Acknowledgements

This research was supported by the National Institute of Fisheries Science (R2022077) and Korea Institute of Marine Science & Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries, Korea (201903922).

We acknowledge Hye Ji Kim, Jong-Bin Park, and Ji Hyun Lee for their excellent technical and scientific support.

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Contributions

Conceptualization, methodology, software, data curation: J.-Y.K.; writing-original draft preparation, validation: H.J.K., formal analysis, visualization: J.S.P.; project administration, writing-review and editing: S.R.K. All authors read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to Se Ryun Kwon.

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All procedures involving animals were approved by Animal Ethics Committee of Chonnam National University (CNU IACUC-YS-2019-8).

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The authors declare no conflict of interest.

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Kim, JY., Kim, H.J., Park, J.S. et al. DNA vaccine dual-expressing viral hemorrhagic septicemia virus glycoprotein and C-C motif chemokine ligand 19 induces the expression of immune-related genes in zebrafish (Danio rerio). J Microbiol. 60, 1032–1038 (2022). https://doi.org/10.1007/s12275-022-2231-8

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  • DOI: https://doi.org/10.1007/s12275-022-2231-8

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