Induction of b cell tolerance

A - Human Necessities – 61 – K

Patent

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Details

A61K 47/48 (2006.01) A61K 9/127 (2006.01)

Patent

CA 2279544

The invention provides methods and compositions for promoting in a first species a state of tolerance against Gal.alpha.1,3Gal epitopes present on a xenograft from a second species, thereby preventing hyperacute rejection (HAR) of the xenograft. The methods and compositions according to the invention cause the elimination or anergy of specific lymphoid according cells which are responsible for the production of xenoreactive natural antibodies (XNAs) which cause HAR of the xenograft. In a first aspect, the invention provides methods and tolerogenic compositions for inducing anergy in B cells which are specific for the Gal.alpha.1,3Gal epitope. In a second aspect, the invention provides methods and tolerogenic compositions for inducing apoptosis in B cells specific for the Gal.alpha.1,3Gal epitope.

L'invention concerne des procédés et des compositions destinées à favoriser chez une première espèce un état de tolérance à l'égard d'épitopes Gal.alpha.1,3Gal présents sur une xénogreffe provenant d'une deuxième espèce, ce qui permet de prévenir un rejet suraigu (HAR) de la greffe. Les procédés et les compositions de l'invention provoquent l'élimination ou l'anergie de cellules lymphoïdes spécifiques, qui sont responsables de la production de xéno-anticorps naturels (XNA), lesquels déclenchent un HAR de la greffe. Dans un premier aspect, l'invention concerne des procédés et des compositions tolérogènes destinées à provoquer une anergie de cellules B spécifiques de l'épitope Gal.alpha.1,3Gal. Dans un deuxième aspect, l'invention concerne des procédés et des compositions tolérogènes destinées à provoquer une apoptose de cellules B spécifiques de l'épitope Gal.alpha.1,3Gal.

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