Antiviral agents and vaccines against influenza

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 14/435 (2006.01) C12N 15/86 (2006.01)

Patent

CA 2642644

These vaccines target H5N1, H1, H3 and other subtypes of influenza and are designed to elicit neutralizing antibodies, as well as cellular immunity. The DNA vaccines express hemagglutinin (HA) or nucleoprotein (NP) proteins from influenza which are codon optimized and/or contain modifications to protease cleavage sites of HA which affect the normal function of the protein. Adenoviral constructs expressing the same inserts have been engineered for prime boost strategies. Protein-based vaccines based on protein production from insect or mammalian cells using foldon trimerization stabilization domains with or without cleavage sites to assist in purification of such proteins have been developed. Another embodiment of this invention is the work with HA pseudotyped lentiviral vectors which would be used to screen for neutralizing antibodies in patients and to screen for diagnostic and therapeutic antivirals such as monoclonal antibodies.

Ces vaccins ciblent le H5N1, le H1, le H3 et d'autres sous-types de la grippe et ils sont conçus pour induire la production d'anticorps neutralisants ainsi qu'une immunité cellulaire. Les vaccins à ADN expriment des protéines hémagglutinine (HA) ou nucléoprotéine (NP) de la grippe dont les codons sont optimisés et/ou qui contiennent des modifications de sites de coupure de protéases de la HA qui affectent la fonction normale de la protéine. Des produits d'assemblage adénoviraux exprimant les mêmes segments d'insertion ont été créés pour des stratégies de type "prime/boost". Des vaccins à base de protéines produites par des cellules d'insectes ou de mammifères en utilisant des domaines de stabilisation de la trimérisation de foldons, avec ou sans sites de coupure pour aider à purifier ces protéines, ont été développés. Un autre mode de réalisation de l'invention est le travail avec des vecteurs lentiviraux pseudotypés de la HA utilisables pour cribler des anticorps neutralisants chez des patients et pour cribler des agents antiviraux diagnostiques et thérapeutiques tels que des anticorps monoclonaux.

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