Archaeosomes as immunomodulating carriers for acellular...

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A61K 39/39 (2006.01) A61K 9/127 (2006.01) A61K 39/00 (2006.01) A61K 39/02 (2006.01) A61P 31/04 (2006.01) A61P 31/12 (2006.01) A61P 35/00 (2006.01)

Patent

CA 2389652

The invention provides methods and compositions useful for inducing major histocompatibility complex class-I (MHC-I)-restricted cytotoxic T lymphocyte (CTL) response in a mammalian host immunized with acellular (non-replicating) antigen. The methods comprise using a liposome, an archaeosome, comprising a polar lipid extract of an archaeobacterium as both immune modulator and carrier for the non-replicating antigen. In addition to a strong antigen- specific CTL response, the archaeosome adjuvant elicits CD4+ Th1, CD4+ Th2 (antibody), and memory responses to the acellular antigen in the vaccine composition. The invention provides methods for mounting a rapid, and a long lasting protective immunity in the vaccinated host against infections caused by intracellular pathogens, especially those that require the host to mount an antigen-specific CD8+ T cell immune response for the protection. The methods of the invention are also useful in, but not restricted to, vaccines for preventing or reducing growth of solid tumors.

L'invention concerne des procédés et des compositions servant à induire une réaction de lymphocytes T cytotoxiques (CRL) contrôlée par le complexe majeur d'histocompatibilité de classe I (CMH-I) chez un hôte mammifère immunisé à l'aide d'un antigène acellulaire (non réplicatif). Les procédés comprennent l'utilisation d'un liposome, un archéosome, qui contient un extrait de lipide polaire d'une archéobactérie comme immunomodulateur et porteur de l'antigène non réplicatif. En plus d'une forte réaction de CTL spécifique d'antigène, l'adjuvant d'archéosome déclenche des réactions de CD4?+¿ Th1, de CD4?+¿ Th2 (anticorps) et des réactions secondaires à l'antigène acellulaire de la composition vaccinale. L'invention concerne des procédés servant à produire une immunité protectrice rapide et durable chez l'hôte vacciné contre des infections provoquées par des pathogènes intracellulaires, notamment ceux qui nécessitent que l'hôte produise pour se protéger une réaction immunitaire de lymphocytes CD8?+¿ spécifique d'antigène. Les procédés de l'invention sont aussi utiles notamment, mais pas exclusivement, dans des vaccins servant à prévenir ou à réduire la croissance de tumeurs solides.

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