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Recombinant VP2 expressed in baculovirus and adjuvanted with TIR-TLR7: a vaccine candidate against infectious bursal disease virus

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Abstract

Currently, a variety of immunostimulatory molecules are used as adjuvants in combination with poor immunogenic recombinant infectious bursal disease virus (IBDV) vaccine antigen. TIR domain of Toll-like receptors (TLRs) triggers the interleukin-1 (IL-1) signaling cascade which plays a critical role in immune responses against infectious agents. For this study, the bacmid DNA pBac-VP2 of a field isolate was generated and transfected to Sf9 insect cells to produce recombinant VP2 (rVP2). In addition, based on in silico analysis, the cDNA encoding the conserved TIR domain of TLR7 (TIR-TLR7) contain the IL-1 receptor was synthesized and used as an adjuvant. We further evaluated the ability of rVP2/TIR-TLR7 vaccine candidate to induce specific immune responses in specific pathogen-free (SPF) chickens and compared the efficacy by challenging with the virulent IBDV. The results indicate that rVP2/TIR-TLR7-adjuvanted vaccine elicited humoral immune responses and protected chickens against IBDV infection. Higher levels of neutralizing IBDV antibody titers were observed in chickens intramuscularly immunized with rVP2/TIR-TLR7 than those injected with rVP2 alone. The antibody titers were higher in chickens which received booster injection. Furthermore, chickens immunized with rVP2/TIR-TLR7 in the prime and boost groups had significant protection against a virus challenge. The survival rate was 70 and 90% after the primary and booster rVP2/TIR-TLR7 vaccinations, respectively, and indicated that they were protected from virus challenge. Despite the unvaccinated control group, the immunized chickens with rVP2/TIR-TLR7 did not show any clinical signs and histopathological changes of the bursa. Our results demonstrate that TIR-TLR7 is a potential vaccine adjuvant and can induce antigen-specific immune responses induced by rVP2 for protection against IBDV infection.

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Funding

This study was supported by the Razi Vaccine and Serum Research Institute [grant no. 2-2-18-93114].

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Authors

Contributions

Conceived and designed the experiments: S. Shahsavandi. Performed the experiments and analyzed the data: MM. Ebrahimi. Contributed analyzed the data: other co-authors.

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Correspondence to Shahla Shahsavandi.

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The authors declare that they have no conflict of interest.

Ethical approval

All applicable National Institutes of Health guide for the care and use of laboratory animals no. 8023 guidelines for the care and use of chickens were followed.

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Ebrahimi, M.M., Shahsavandi, S., Shayan, P. et al. Recombinant VP2 expressed in baculovirus and adjuvanted with TIR-TLR7: a vaccine candidate against infectious bursal disease virus. Comp Clin Pathol 27, 911–916 (2018). https://doi.org/10.1007/s00580-018-2681-x

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  • DOI: https://doi.org/10.1007/s00580-018-2681-x

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