Packaging of immunostimulatory oligonucleotides into...

C - Chemistry – Metallurgy – 07 – H

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C07H 21/04 (2006.01) A61K 31/7088 (2006.01) A61K 39/00 (2006.01) A61K 39/385 (2006.01) A61K 39/39 (2006.01) A61P 37/04 (2006.01) C07H 21/00 (2006.01)

Patent

CA 2517675

The invention relates to the finding that virus like particles (VLPs) can be loaded with immunostimulatory substances, in particular with DNA oligonucleotides containing non-methylated C and G (CpGs). Such CpG-VLPs are dramatically more immunogenic than their CpG-free counterparts and induce enhanced B and T cell responses. The immune response against antigens optionally coupled, fused or attached otherwise to the VLPs is similarly enhanced as the immune response against the VLP itself. In addition, the T cell responses against both the VLPs and antigens are especially directed to the Th1 type. Antigens attached to CpG-loaded VLPs may therefore be ideal vaccines for prophylactic or therapeutic vaccination against allergies, tumors and other self-molecules and chronic viral diseases.

Il a été découvert que des particules pseudovirales (VLP) peuvent être chargées de substances immunostimulatrices, en particulier d'oligonucléotides d'ADN contenant des C et G non méthylés (CpGs). Ces CpG-VLP sont bien plus immunogènes que leurs homologues exempts de CpG et induisent des réponses de lymphocytes B et T améliorées. La réponse immunitaire contre des antigènes éventuellement liés, fusionnés ou autrement fixés aux VLP est améliorée de façon similaire en tant que réponse immunitaire contre les VLP elles-mêmes. En outre, les réponses de lymphocytes T à la fois contre les VLP et les antigènes sont spécialement dirigées vers le type Th1. Par conséquent, des antigènes fixés aux VLP chargées de CpG peuvent constituer des vaccins idéaux pour une vaccination prophylactique ou thérapeutique contre des allergies, des tumeurs et d'autres molécules du soi ainsi que des maladies virales chroniques.

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