Vaccine compositions

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/62 (2006.01) A61K 39/02 (2006.01) A61K 39/112 (2006.01) C07K 14/24 (2006.01) C12N 15/31 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2184902

Novel DNA constructs are provided that are capable of transforming microorganisms such that they can be used as live or attenuated vaccines which induce such immune response at mucosal surfaces. Further provided are such transformed microorganisms per se and vaccine compositions containing them. Preferred constructs of the invention are capable of transforming microorganisms such that they express Y. pestis protein or a protective epitopic fragment thereof while retaining a capability to establish themselves in human or animal gut environment. Several constructs have been identified that are capable of transforming gut dwelling organisms such as S. typhimurium or S. typhi to enable V-protein antigen production.

On décrit de nouveaux produits d'assemblage d'ADN pouvant transformer des micro-organismes, ce qui permet d'utiliser ces derniers comme vaccins vivants ou atténués induisant une réponse immunitaire sur les surfaces muqueuses. On décrit aussi de tels micro-organismes transformés ainsi que des compositions vaccinales les contenant. Les produits d'assemblage préférés dans le cadre de cette invention peuvent transformer des micro-organismes de façon qu'ils expriment une protéine de Y. pestis, ou un de ses fragments épitopiques protecteurs, tout en gardant la capacité de s'installer dans l'environnement interstinal humain ou animal. On a identifié plusieurs produits d'assemblage pouvant transformer des organismes résidant dans l'intestin, tels que S. tiphimurium ou S. tiphi, pour qu'ils produisent un antigène, la protéine V.

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