Polysaccharide derivatives and uses in induction of an...

C - Chemistry – Metallurgy – 08 – B

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C08B 37/00 (2006.01) A61K 39/095 (2006.01)

Patent

CA 2568982

The present invention generally provides compositions comprising a polysaccharide derivative, and methods of their preparation and use for the prevention or treatment of diseases caused by Neisseria meningitidis bacteria, particularly group B (NmB) strains, and by E. coli K1. The invention provides a de-N-acetylated PS derivative in which one or more residues of the PS has been modified by de-N-acetylation. The invention also includes derivatives in which one or more of the N-acetyl groups of PS containing de-N-acetylated PS are replaced with other N-acyl groups, usually a lower acyl group of C2 - C3. Further, the invention includes de-N-acetylated PS derivatives containing long chain hydrocarbons, as well as conjugates in which the de-N-acetylated PS derivative is linked to a carrier, e.g., a carrier protein.

L'invention porte d'une manière générale sur des compositions contenant des dérivés de polysaccharide (PS) et sur leurs procédés de préparation et d'utilisation pour la prévention ou le traitement de maladies causées par la bactérie <i>Neisseria meningitidis</i>, en particulier pas ses souches du groupe B (NmB), et par le <i>E</i>. <i>coli</i> K1. L'invention porte également sur un dérivé dans lesquels un ou plusieurs des résidus dé-N-acétylés du PS ont été modifiés par dé-N-acétylation; sur un dérivé dans lequel un ou plusieurs des groupes N-acétylés du PS contenant un PS dé-N-acétylé sont remplacés par d'autres groupes N-acyle, et usuellement par un groupe C2 - C3 faiblement acylique; sur des dérivés de PS N-acétylés contenant des hydrocarbones à chaîne longue; et sur des conjugués dans lesquels un tel dérivé est lié à un support, par exemple une protéine support.

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