Live attenuated influenza virus vaccines comprising microrna...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/86 (2006.01) C12N 15/113 (2010.01) A61K 39/145 (2006.01) A61P 31/16 (2006.01) A61P 37/04 (2006.01) C12N 7/01 (2006.01) C12N 15/44 (2006.01) C12N 15/85 (2006.01)

Patent

CA 2754826

The invention is directed to novel live attenuated influenza virus (LAN) vaccines comprising one or more microRNA (miRNA) Response Element(s) (MRE) within an influenza virus genome. The MREs useful for the present invention can be derived from any miRNA which is highly expressed in influenza-targeted cells of an animal in need of vaccination but are not expressed or are expressed at very low levels in species (e.g., embryonated chicken eggs) or cell lines used for a large-scale vaccine production. This allows efficient vaccine production but renders the vaccine virus susceptible to attenuation in the influenza-targeted cells of vaccinated animals expressing a cognate miRNA.

Cette invention concerne de nouveaux vaccins avec le virus vivant atténué de la grippe (LAIV) comprenant un ou plusieurs MRE (éléments de réponse du type micro-ARN (miARN)) dans un génome du virus de la grippe. Les MRE utiles pour la présente invention peuvent être dérivés de tout miARN qui est fortement exprimé dans les cellules ciblées par la grippe d'un animal nécessitant une vaccination mais qui n'est pas exprimé, ou est exprimé à de très bas niveaux, chez l'espèce (par exemple, ufs de poule embryonnés) ou les lignées cellulaires utilisées pour une production du vaccin à grande échelle. Ceci permet une production de vaccins efficace mais rend le virus du vaccin sensible à l'atténuation dans les cellules ciblées par la grippe des animaux vaccinés exprimant un miARN apparenté.

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