Multi-epitope peptide-loaded dendritic cell immunotherapy...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 9/64 (2006.01) C12N 5/0784 (2010.01) A61K 35/12 (2006.01) A61K 39/00 (2006.01) A61P 35/00 (2006.01)

Patent

CA 2670107

The invention involves peptides of from about 7 to about 50 amino acid residues in length that have epitopes that bind to more than one HLA class II protein and stimulate CD4+ T cells for treatment of cancer from one of three serine proteases overexpressed in ovarian cancer and other cancers - stratum corneum chymotryptic enzyme, matriptase, and hepsin. Since the peptides bind to more than one HLA class II protein variant, they can be used to treat cancer in most patients of a population having a variety of HLA class II alleles. The peptides can be loaded onto autologous dendritic cells of a cancer patient and infused into the patient to activate a CD4+ and CD8+ T cell response that recognizes tumor cells expressing the peptide antigen.

Cette invention concerne des peptides d'une longueur d'environ 7 à environ 50 résidus d'acides aminés comportant des épitopes qui se fixent à plusieurs protéines HLA de classe II et stimulent les lymphocytes T CD4+ dans le traitement du cancer, dérivant de l'une des trois sérine protéases surexprimées dans le cancer des ovaires et dans d'autres cancers (enzyme chymotryptique de la couche cornée, matriptase et hepsine). Étant donné que ces peptides se fixent à plus d'une variante protéique HLA de classe II, ils peuvent être utilisés pour traiter le cancer chez la plupart des patients d'une population ayant différents allèles HLA de classe II. Les peptides peuvent être chargés sur les cellules dendritiques autologues d'un patient cancéreux, et être perfusés au patient pour activer une réponse lymphocytaire T CD4+ et CD8+ qui reconnaît les cellules tumorales exprimant l'antigène peptidique.

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