Methods for preventing graft rejection in transplantation...

A - Human Necessities – 61 – K

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A61K 48/00 (2006.01) A61K 38/17 (2006.01) C12N 5/10 (2006.01) C12N 15/13 (2006.01)

Patent

CA 2272130

A method to prevent graft rejection of transplanted cells, tissues or organs without general immunosuppression is described. The method employs a newly discovered protein, LAG-3. When allogeneic or xenogeneic cells are engineered to express LAG-3 on their surface and transplanted, immune destruction of the implanted cell, tissue or organ is prevented, while the host's immune system remains functional. A particular application of this method allows the preparation of a universal gene therapy host cell expressing LAG-3 on its surface for protection from graft rejection by a host's immune system.

Cette invention concerne un procédé de prévention de rejet de greffon constitué de cellules, tissus ou organes transplantés, sans immunodépression générale. Dans le procédé, on utilise une protéine découverte récemment, la LAG-3. Lorsque des cellules allogéniques ou xénogéniques sont manipulées de sorte qu'elles expriment LAG-3 à leur surface, et transplantées, elles empêchent la destruction immunologique de la cellule, du tissu ou de l'organe implanté, alors que le système immunitaire de l'hôte reste fonctionnel. Une application particulière de ce procédé permet de mettre au point une cellule hôte universelle de thérapie génique exprimant LAG-3 à sa surface pour empêcher un rejet de greffon par le système immunitaire d'un hôte.

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