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Vaccination of plasmid DNA encoding ORF81 gene of CJ strains of KHV provides protection to immunized carp

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Abstract

In order to construct the recombinant plasmid of pIRES-ORF81, the nucleic acid isolated from Koi herpes virus-CJ (KHV-CJ) strains was used as a template to insert the ORF81 gene fragments amplified by PCR into the pIRES-neo, a kind of eukaryotic expression vector. Using Western blotting analysis, it was verified that ORF81 gene protein can be expressed correctly by pIRES-ORF81, after MFC cells were transfected. The recombinant plasmid pIRES-ORF81 was set into three immunization dose gradients: 1, 10, and 50 μg/carp. Empty plasmid group, PBS group, and blank control group were set simultaneously. Giving intramuscular injections to healthy carps with an average body mass of 246 ± 20 g, indirect ELISA was used to regularly determine antibody levels after three times immunization injection. Neutralizing antibodies were detected by neutralization assay. The results of inoculation tests showed that the pIRES-ORF81 recombinant plasmid can induce the production of carp-specific antibodies. The differences of immune effect between the three different doses of immune gradients were not significant (P > 0.05), but they can induce the production of neutralizing antibodies. After 25 d of inoculation, carp mortality of pIRES-neo empty vector treatment groups was 85%, while the carp mortality of eukaryotic expression recombinant plasmid pIRES-ORF81 injected with three different doses of immune gradients was 20, 17.5, and 12.5%, respectively. Differences in comparison to the control group were highly significant (P < 0.01). However, histopathological section of immunohistochemistry organization revealed no significant changes. It demonstrated that the DNA vaccine pIRES-ORF81 constructed in the experiment displayed a good protective effect against KHV, which had the potential to industrial applications.

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Acknowledgements

This study was funded by the National Natural Science Foundation of China (No. 30671621), supported by the World Bank project in Jilin Province (No. 2011-YS13) and industrial technology research and exploitation project of Jilin Province (No. 2011002–1).

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Correspondence to Dongming Zhang.

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Editor: T. Okamoto

Jingxiang Zhou and Jiangdong Xue contributed equally to this work.

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Zhou, J., Xue, J., Wang, Q. et al. Vaccination of plasmid DNA encoding ORF81 gene of CJ strains of KHV provides protection to immunized carp. In Vitro Cell.Dev.Biol.-Animal 50, 489–495 (2014). https://doi.org/10.1007/s11626-014-9737-2

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  • DOI: https://doi.org/10.1007/s11626-014-9737-2

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