B7-dc variants

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 14/705 (2006.01) A61K 38/17 (2006.01) A61P 37/04 (2006.01) C12N 15/12 (2006.01) C12N 15/62 (2006.01)

Patent

CA 2693707

Compositions and methods for costimulating T cells (i.e., increasing antigen-specific proliferation of T cells, enhancing cytokine production by T cells, stimulating differentiation ad effector functions of T cells and/or promoting T cell survival) are provided. Suitable compositions include variant B7-DC polypeptides, fragments and fusion proteins thereof. Variant B7-DC polypeptides have reduced binding affinity for the inhibitory PD-I ligand and substantially retain the ability to costiniulate T cells. Methods for using variant B7-DC polypeptides to stimulate immune responses in subjects in need thereof are provided.

L'invention concerne des compositions et des méthodes de co-stimulation des lymphocytes T (c'est-à-dire d'augmentation de la prolifération spécifique à l'antigène des lymphocytes T, l'amélioration de la production de cytokines par les lymphocytes T, la stimulation des fonctions de différenciation et d'effecteur des lymphocytes T et/ou la promotion de la survie des lymphocytes T). Des compositions adaptées contiennent des variants de polypeptides de B7-DC, ainsi que des fragments et des protéines de fusion associés. Les variants de polypeptides de B7-DC présentent une affinité de liaison réduite pour le ligand d'inhibition PD-I et conservent sensiblement la capacité de co-stimuler les lymphocytes T. L'invention concerne également des méthodes d'utilisation de variants de polypeptides de B7-DC pour stimuler des réponses immunes chez des sujets en ayant besoin.

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