Vaccination strategy to prevent and treat cancers

A - Human Necessities – 61 – K

Patent

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Details

A61K 38/00 (2006.01) A61K 38/04 (2006.01) A61K 38/08 (2006.01) A61K 38/10 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2331378

A cellular immune response is induced to a non-immunogenic or weakly immunogenic target protein expressed by tumor cells, by administering to a mammalian subject an amount of a therapeutic antigen effective to induce a cellular immune response to the target protein. The therapeutic antigen is an immunogenic peptide having an MHC-binding portion which binds to the major histocompatibility complex (MHC) and an immune-recognition portion which is recognized by T-cells. The therapeutic antigen is derived from the non- immunogenic or weakly immunogenic target protein such that the MHC-binding portion binds to MHC with a greater affinity than the target protein without material alteration of the immune-recognition portion. The therapeutic antigen may include a sorting signal which directs the transport of the therapeutic antigen into the endoplasmic reticulum and into the endosome/lysosome to facilitate loading of the peptide onto MHC class I and class II molecules, respectively, to facilitate loading of the protein onto MHC molecules for presentation to the immune system.

L'invention concerne un procédé, permettant d'induire une réaction cellulaire immunitaire dans une protéine cible faiblement ou non immunologique exprimée par des cellules tumorales, consistant à administrer à un mammifère une quantité d'un gène thérapeutique efficace de façon à induire une réaction cellulaire immunitaire. L'antigène thérapeutique est un peptide immunologique possédant une partie de liaison de MCH qui se lie au complexe majeur d'histocompatibilité (MHC) et une partie de reconnaissance immunitaire qui est reconnue par des lymphocytes T. L'antigène thérapeutique est dérivé de la protéine cible faiblement ou non immunologique, de sorte que la partie de liaison de MCH se lie à MCH avec une affinité plus grande que celle de la protéine cible, sans altérer un matériau de la partie de reconnaissance immunitaire. L'antigène thérapeutique peut comprendre un signal de tri qui oriente le transport dudit antigène dans le réticulum endoplasmique et dans l'endosome/lysosome, de façon à faciliter le chargement du peptide sur les molécules MCH respectives des classes I et II, ce qui facilite le chargement de la protéine sur les molécules MCH pour présentation au système immunitaire.

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