Rsv gene expression vaccine

A - Human Necessities – 61 – K

Patent

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Details

A61K 39/155 (2006.01) A61K 47/36 (2006.01) C07K 14/135 (2006.01) C12N 15/00 (2006.01)

Patent

CA 2466020

An effective prophylactic mucosal gene expression vaccine (GXV), made up of a coctail of a least 4 different plasmid DNAs encoding corresponding RSV antigens, coacervated with chitosan to formulate nanospheres. In a murine model of RSV infection, intranasal administration with GXV results in significant induction of RSV-specific antibodies, nasal IgA antibodies, cytotoxic T lymphocytes, and IFN-.gamma. production in the lung and splenocytes. A single dose of GXV induces a drastic reduction of viral titers.

L'invention concerne un vaccin à expression génique par voie muqueuse, prophylactique et efficace (GXV) constitué d'un cocktail d'au moins 4 ADN plasmides différents codant des antigènes du virus syncytial respiratoire (RSV) correspondants et coacervé avec du chitosane, de manière à formuler des nanosphères. Dans un modèle murin d'une infection au RSV, une administration intranasale au moyen du GXV permet d'induire de manière importante des anticorps spécifiques du RSV, des anticorps nasaux IgA, des lymphocytes T cytotoxiques et une production de IFN-.gamma. dans les poumon et splénocytes. Une dose unique de GXV induit une réduction radicale de titres viraux.

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