Plant-produced recombinant influenza vaccine based on virus-like HBc particles carrying an extracellular domain of M2 protein |
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Authors: | N V Ravin R Y Kotlyarov E S Mardanova V V Kuprianov A I Migunov L A Stepanova L M Tsybalova O I Kiselev K G Skryabin |
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Institution: | Centre "Bioengineering", Russian Academy of Sciences, Moscow, Russia. nravin@biengi.ac.ru |
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Abstract: | Conventional influenza vaccines are based on a virus obtained in chicken embryos or its components. The high variability of
the surface proteins of influenza virus, hemagglutinin and neuraminidase, requires strain-specific vaccines matching the antigenic
specificity of newly emerging virus strains to be developed. A recombinant vaccine based on a highly conservative influenza
virus protein M2 fused to a nanosized carrier particle can be an attractive alternative to traditional vaccines. We have constructed
a recombinant viral vector based on potato X virus that provides for expression in the Nicotiana benthamiana plants of a hybrid protein M2eHBc consisting of an extracellular domain of influenza virus M2 protein (M2e) fused to hepatitis
B core antigen (HBc). This vector was introduced into plant cells by infiltrating leaves with agrobacteria carrying the viral
vector. The hybrid protein M2eHBc was synthesized in the infected N. benthamiana plants in an amount reaching 1–2% of the total soluble protein and formed virus-like particles with the M2e peptide presented
on the surface. Methods of isolation and purification of M2eHBc particles from plant producers were elaborated. Experiments
on mice have shown a high immunogenicity of the plant-produced M2eHBc particles and their protective effect against lethal
influenza challenge. The developed transient expression system can be used for production of M2e-based candidate influenza
vaccine in plants. |
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