Abstract
In an animal model, we evaluated the possibility to induce antibodies directed against the tumor-associated antigen CA125 by immunization with the anti-CA125 antibody OC125 via activation of the idiotypic network. Our results show that Balb/c mice, immunized by repeated administrations of F(ab′)2-fragments of the OC125 antibody (Ab1), produced anti-idiotypic antibodies (Ab2). The binding of these antibodies to the OC125 could be completely inhibited by the antigen CA125, suggesting that the anti-idiotypic antibodies imitate the original target antigen of the OC125. After induction of these paratopebinding anti-idiotypic antibodies (Ab2β), a murine IgG-anti-CA125 (Ab3) response arose in the same mice. The induction of idiotypic cascades offers the possibility of immunization against tumor-associated antigens without using the original antigen and breaking antitumor tolerance.
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Schultes, B.C., Reinsberg, J., Wagner, U. et al. Idiotypic cascades after injection of the monoclonal antibody OC125. Cell Biophysics 24, 259–266 (1994). https://doi.org/10.1007/BF02789237
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DOI: https://doi.org/10.1007/BF02789237