CROSS-PROTECTIVE PROPERTIES OF AN INFLUENZA VACCINE BASED ON HBC4M2E RECOMBINANT PROTEIN
- Authors: Tsybalova L.M.1, Stepanova L.A.1, Shuklina M.A.1, Petrov S.V.1, Kovaleva A.A.1, Potapchuk M.V.1, Shaldzhan A.A.1, Zabrodskaya Y.A.1, Egorov V.V.1
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Affiliations:
- Research Institute of Influenza
- Issue: Vol 63, No 2 (2018)
- Pages: 68-76
- Section: ORIGINAL RESEARCH
- URL: https://journals.rcsi.science/0507-4088/article/view/117962
- DOI: https://doi.org/10.18821/0507-4088-2018-63-2-68-76
- ID: 117962
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Full Text
Abstract
One of the main problems in the area of influenza prophylaxis and pandemic prevention is the development of cross-reactive vaccines, i.e. vaccines directed against all subtypes of human influenza viruses. Such vaccines are being developed in many countries for more than 10 years. A number of vaccines are presently undergoing clinical trials. We created Uniflu candidate vaccine based on recombinant HBc4M2e protein consisting of 4 tandem-connected copies of the highly conserved ectodomain of M2 protein of the influenza A virus. These 4 copies were genetically fused to the carrier protein, namely hepatitis B core antigen. Commercially available Derinat was used as adjuvant in the candidate vaccine. Preclinical studies on laboratory animals (mice, ferrets) demonstrated that immunization with Uniflu leads to significantly higher level of specific immunoglobulins in the blood and bronchoalveolar lavages. Moreover, it produces immunoglobulins belonging to subtype IgG2a that is the most important mediator of antibody-dependent cytotoxicity. The vaccine under review stimulates the proliferation of T-lymphocytes, as well as the formation of CD4+ and CD8+ T-cells synthesizing ɣ-IFN. When infected with the lethal doses (5 LD50) of influenza A viruses of the subtypes H1N1, H2N2, H3N2, and H1N1pdm09, immunized animals typically developed mild form of illness. This kept them alive in 90-100% of cases, which demonstrated almost complete protection from death. Replication of the virus in the lungs of immunized mice was reduced by 1.8-4.8 log10. High immunogenicity of the vaccine, and reduced clinical symptoms following experimental infection, were demonstrated in ferrets as well. The developed recombinant vaccine Uniflu has high specific activity and cross-protection. Uniflu can be proposed as pre-pandemic vaccine, provided that it passes clinical trials.
About the authors
L. M. Tsybalova
Research Institute of Influenza
Author for correspondence.
Email: sovet@influenza.spb.ru
Russian Federation
L. A. Stepanova
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
M. A. Shuklina
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
S. V. Petrov
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
A. A. Kovaleva
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
M. V. Potapchuk
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
A. A. Shaldzhan
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
Y. A. Zabrodskaya
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
V. V. Egorov
Research Institute of Influenza
Email: noemail@neicon.ru
Russian Federation
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