Recombinant rsv strains with altered g protein

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 14/135 (2006.01) A61K 39/155 (2006.01) C12N 5/10 (2006.01) C12N 15/45 (2006.01) C12N 15/63 (2006.01)

Patent

CA 2569983

The construction of recombinant respiratory syncytial virus (RSV) strains deleted of the region of G protein most likely to induce unwanted type 2 T cell responses in susceptible recipients is disclosed. Using reverse genetics, recombinant RSV strains were engineered with deletions of amino acids 151-221 and 178-219. Both RSV strains replicated in the respiratory tract of BALB/c mice and elicited serum neutralization and anti-F protein IgG titers that were equivalent to cp-RSV and contributed to a 3.9 log10 reduction in RSV A2 four days after challenge. Importantly, pulmonary eosinophilia was significantly diminished in BALB/c mice primed with native G protein and challenged with either recombinant RSV strain. These findings are important for the development of immunogenic compositions against RSV.

L'invention a trait à la construction de souches du virus respiratoire syncytial (VRS) recombinées qui ont été délétées de la région de la protéine G très probablement responsable de réponses de lymphocytes T de type 2 indésirées chez des receveurs sensibles. La génétique inverse a permis de mettre au point des souches de VRS recombinées avec des délétions d'acides aminés 151-221 et 178-219. Les deux souches de VRS se sont répliquées dans les voies respiratoires de souris BALB/c, et ont élicité la séroneutralisation et des titres IgG anti-protéine F qui étaient équivalents au VRS-cp et ont contribué à une réduction de 3,9 log10 de A2 VRS quatre jours après le test de provocation. De manière notable, l'éosinophilie pulmonaire était considérablement plus basse chez les souris BALB/c sensibilisées avec une protéine G native et soumises à une provocation avec l'une ou l'autre souche VRS. Ces découvertes sont importantes pour l'élaboration de compositions immunogènes dirigées contre le VRS.

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