Immunogenic compositions comprising venezuelan equine...

C - Chemistry – Metallurgy – 07 – K

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C07K 14/18 (2006.01) A61K 39/155 (2006.01) C07K 14/135 (2006.01)

Patent

CA 2526146

Self-propagating, fusogenic blebs are produced from cells infected with a population of Venezuelan Equine Encephalitis virus replicon particles (VRP). The self-propagating, fusogenic nature of the blebs is derived from expression of heterologous genes encoding viral fusion proteins that are incorporated into the replication defective replicon particles. The resulting blebs can be harvested from supernatants of cells displaying severe cytopathic effects. The blebs are used to make immunogenic compositions and devise methods of immunizing mammals against paramyxoviruses such as parainfluenza virus type 3.

Selon l'invention, des vésicules fusogènes auto-reproductibles sont produites à partir de cellules infectées par une population de particules de réplicon (virus replicon particles / VRP) du virus de l'encéphalite équine du Venezuela. La nature fusogène et auto-reproductible des vésicules est dérivée de l'expression de gènes hétérologues codant pour des protéines de fusion virale qui sont incorporées dans les particules de réplicon à déficience de réplication. Les vésicules obtenues peuvent être récupérées dans la partie surnageante de cellules ayant des effets cytopathiques sévères. Les vésicules sont utilisées pour produire des compositions immunogènes et mettre au point des procédés pour immuniser des mammifères contre des paramyxovirus tels que le virus de la parainfluenza de type 3.

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