Glucan-based vaccines

A - Human Necessities – 61 – K

Patent

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Details

A61K 39/385 (2006.01) A61K 39/00 (2006.01) A61P 31/00 (2006.01) C07K 16/14 (2006.01)

Patent

CA 2485847

Anti-glucan antibodies have been found to be protective against systemic fungal infection with C.albicans, but the protective efficacy can be inhibited by blocking antibodies. The invention provides an immunogenic composition comprising a glucan and a pharmaceutically acceptable carrier, characterised in that, when administered to a mammalian recipient, the composition elicits protective anti-glucan antibodies but does not elicit antibodies which inhibit the protective efficacy of the anti-glucan antibodies. The glucan may be presented on the surface of a protease-treated microbial cell or may be presented as a protein-glucan conjugate. The glucan may be substituted by a glucan mimotope, a peptidomimetic of a glucan mimotope, or nucleic acid encoding a mimotope. Anti-glucan-antibodies show broad spectrum microbicidal activity. .szlig.-glucans are preferred, particularly those containing one or more .szlig.-1,6 linkages

Il a pu être établi que les anticorps antiglucane ont un effet protecteur contre une infection fongique systémique par <i>C.albicans</i>, mais que l'efficacité de protection peut être inhibée par des anticorps bloquants. L'invention concerne une composition immunogène comprenant un glucane et un excipient pharmaceutiquement acceptable, caractérisée en ce qu'elle déclenche, lorsqu'elle est administrée à un sujet mammifère, la production d'anticorps protecteurs antiglucane sans déclencher la production d'anticorps inhibant l'efficacité de protection des anticorps antiglucane. Le glucane peut être présenté sur la surface d'une cellule microbienne traitée par protéase, ou comme un conjugué protéine-glucane. Le glucane peut être substitué par un mimotope de glucane, un peptidomimétique de mimotope de glucane, ou un acide nucléique codant pour un mimotope. Des anticorps antiglucane présentent une activité microbicide à large spectre. Les .szlig.-glucanes sont les glucanes préférés, en particulier ceux qui contiennent une ou plusieurs liaisons .szlig.-1,6.

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