Modified cells and methods for inhibiting hyperacute...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/54 (2006.01) A61K 31/70 (2006.01) A61K 35/12 (2006.01) A61K 39/00 (2006.01) C12N 5/06 (2006.01) C12N 5/10 (2006.01) C12N 9/40 (2006.01) C12N 15/11 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2191891

Modified cells for transplantation having reduced capacity to stimulate natural antibody-mediated hyperacute rejection of the cell in a transplant recipient are disclosed. In unmodified form, cells for use in xenogeneic transplantation express at least one epitope on a cell surface antigen which is bound by natural antibodies in a recipient. Prior to transplantation, the cells are modified to alter, reduce or substantially eliminate expression of the epitope on the cell surface. Preferably, the cell is a porcine cell and the epitope is a galactosyl (.alpha.1,3) galactose epitope. Methods for reducing the immunogenicity of a cell for transplantation into a recipient are also disclosed. Modified cells of the invention can additionally be treated to alter, reduce or substantially eliminate another surface antigen (e.g., an MHC class I antigen) which stimulates a cellular immune response against the cell in a recipient. Additionally, a recipient can be treated with an agent which inhibits T cell activity, such as an immunosuppressive drug or an anti-T cell antibody.

La présente invention concerne des modifications cellulaires pour greffes caractérisées par une aptitude moindre à stimuler chez un receveur de greffe la réaction suraiguë de rejet à médiation d'anticorps naturels. Sous leur forme non modifiée, les cellules utilisées dans les xénogreffes expriment au moins un épitope sur un antigène d'enveloppe cellulaire, lequel antigène présente chez le receveur une liaison naturelle par anticorps. Avant la greffe, les cellules subissent une modification altérant, réduisant ou éliminant essentiellement l'expression épitopique sur la surface cellulaire. La cellule est de préférence d'origine porcine, et l'épitope est un galactosyl (.alpha.1,3) galactose. L'invention concerne également des procédés de réduction de l'immunogénicité d'une cellule à greffer chez un receveur. Il est possible en outre de traiter les cellules modifiées selon la présente invention pour altérer, réduire ou éliminer un autre antigène d'enveloppe (par exemple un antigène MHC de classe (I) stimulant chez le receveur une immunoréaction cellulaire contre la cellule. En outre, un receveur peut recevoir un traitement par un agent inhibiteur de l'activité des cellules T tel qu'un médicament immunodépresseur ou un anticorps cellulaire anti-T.

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