Lactobacilli harboring aggregation and mucin binding genes...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/74 (2006.01) A61K 39/106 (2006.01) C07K 14/335 (2006.01) C07K 14/47 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2323634

Live vaccines and methods for preparing the vaccines useful in protecting a host from infection by a pathogenic microorganism are provided. Vaccines are prepared from live Lactobacillus cells which have been transformed using DNA technology to express heterologous antigens of pathogenic microorganisms or other suitable biological material. Genes encoding antigenic determinants pathogenic in the mammalian gastrointestinal tract are inserted into expression cassettes and fused with genes encoding an aggregation factor and/or a mucin binding factor. The inserted genes are shown to transform L. reuteri cells. The aggregation enhancing and mucin binding genes have been isolated and sequenced. The vaccine can be ingested orally in a pharmaceutical carrier or in milk products.

L'invention concerne des vaccins à cellules vivantes et des procédés de préparation de ces vaccins, utiles pour protéger un hôte d'une infection à micro-organisme pathogène. On prépare ces vaccins à partir de cellules vivantes de Lactobacillus, transformées à l'aide d'une technologie de l'ADN, afin d'exprimer des antigènes hétérologues de micro-organismes pathogènes ou un autre matériau biologique approprié. On a inséré des gènes codant des déterminants antigéniques, pathogènes du tractus gastro-intestinal mammifère, dans des cassettes d'expression et on les a fusionnés avec des gènes codant un facteur d'agrégation et/ou un facteur de fixation de mucine. Les gènes insérés ont la propriété de transformer les cellules L. reuteri. On a isolé et séquencé les gènes favorisant l'agrégation et les gènes de fixation de mucine. On peut ingérer ce vaccin oralement dans un support pharmaceutique ou dans des produits laitiers.

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