Cell death inducer

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 16/28 (2006.01) A61K 39/395 (2006.01) A61P 35/00 (2006.01) C07K 16/18 (2006.01) C12N 15/13 (2006.01) C07K 14/74 (2006.01)

Patent

CA 2657385

The object is to provide an antibody having a high cell death-inducing activity. To achieve the object, a mouse is immunized with a cell capable of expressing both human HLA class IA and human .beta.2 microglobulin (.beta.2M) to produce monoclonal antibodies. The monoclonal antibodies are screened for an antibody having a cell death-inducing activity, and 10 clones are obtained. The analysis of the clones reveals that three clones (C3B3, C11B9, C17D11 antibodies) which has an .alpha.2 domain of HLA class I antigen in their epitopes can cross-link with an anti-murine IgG antibody to show a potent cytotoxic activity. When a diabody of the C3B3 antibody is produced, it is found that the diabody shows a more potent anti-tumor effect compared to that of a diabody of a 2D7 antibody which is a known antibody against HLA class IA.

L'invention a pour objectif la production d'un anticorps à activité inductrice de mort cellulaire élevée. Pour cela, une souris est immunisée avec une cellule pouvant exprimer à la fois le HLA humain classe IA et la .beta.2 microglobuline (.beta.2M) humaine afin de produire des anticorps monoclonaux. Les anticorps monoclonaux font l'objet d'un criblage à la recherche d'un anticorps à activité inductrice de mort cellulaire et 10 clones sont obtenus. L'analyse des clones révèle que trois d'entre eux (anticorps C3B3, C11B9, C17D11), qui présentent un domaine .alpha. 2 de l'antigène HLA classe I dans leurs épitopes, peuvent réticuler avec un anticorps IgG anti-murine pour déployer une puissante activité cytotoxique. Si un diabody de l'anticorps C3B3 est produit, il est établi qu'il présente une activité anti tumorale plus importante par rapport à celle d'un diabody d'anticorps 2D7, un anticorps connu dirigé contre le HLA classe IA.

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