Packaged virus-like particles for use as adjuvants: method...

A - Human Necessities – 61 – K

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A61K 39/39 (2006.01) A61K 39/00 (2006.01) A61K 39/35 (2006.01) A61K 39/385 (2006.01) A61P 37/04 (2006.01) C07K 14/02 (2006.01) C07K 14/08 (2006.01) C12N 7/04 (2006.01)

Patent

CA 2488856

The invention relates to the finding that virus like particles (VLPs) can be loaded and packaged, respectively, with DNA oligonucleotides rich in non~ methylated C and G (CpGs). If such CpG-VLPs are mixed with antigens, the immunogenicity of these antigens are dramatically enhanced. In addition, the T cell responses against the antigens are especially directed to the Thl type. Surprisingly, no covalent linkage of the antigen to the VLP is required; it is sufficient to simply mix the VLPs with the adjuvants for co-administration. In addition, it was found that VLPs did not enhance immune responses unless they were loaded and packaged, respectively, with CpGs. Antigens mixed with CpG- packaged VLPs may therefore be ideal vaccines for prophylactic or therapeutic vaccination against allergies, tumors and other self- molecules and chronic viral diseases.

L'invention concerne la découverte que des particules pseudo-virales (VLP) peuvent être chargées et enveloppées, respectivement, avec des oligonucléotides d'ADN riches en C et G non méthylés (CpG). Si de telles CpG-VLP sont mélangées avec des antigènes, l'immunogénicité de ces antigènes est considérablement renforcée. En outre, les réponses des lymphocytes T à ces antigènes est spécifiquement dirigée contre le type Th1. De façon surprenante, aucune liaison covalente de l'antigène et de la VLP n'est requise, il suffit de simplement mélanger les VLP avec les adjuvants pour une co-administration. En outre, on a découvert que les VLP ne renforcent pas les réponses immunitaires sauf si elles sont chargées et enveloppées, respectivement, avec CpG. Des antigènes mélangés avec des VLP enveloppées de CpG peuvent donc constituer des vaccins idéaux pour une vaccination de type prophylactique ou thérapeutique contre des allergies, des tumeurs et d'autres molécules du soi et maladies virales chroniques.

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