Previously we developed a murine monoclonal anti-idiotype (antiid) antibody (4C10) that mimics the melanoma-associated ganglioside antigen GM3, that is, it carries the internal image of GM3. 4C10 was made against the human monoclonal antibody (HuMAb) L612, which reacts with several types of human cancer cells, including melanoma and breast cancer. To reduce mouse components of 4C10, the constant region was replaced by a human constant domain to form the murine/human chimeric anti-id antibody TVE-1. In the present study, we sought to determine which chain (VH or VL) of the anti-id is responsible for the antigenicity of GM3. The TVE-1 VH and VL expression vectors were simultaneously transfected with either the VH or VL expression vector of a murine-human chimeric IgG antidansyl haptenic antibody, resulting in the construction of three different combinations of VH and VL chimeric antibodies. These IgG molecules were produced from the transfectomas, and their reactivity to HuMAb L612 was tested. Neither of the IgG proteins that had cross-combined the VH-VL pair showed positive results, suggesting that both heavy and light chains are required to express the antigenicity. The in vivo antigenicity of this chimeric anti-id was confirmed by skin tests in melanoma patients receiving active specific immuntherapy.
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human monoclonal antibody
mouse monoclonal antibody
enzyme-linked immunosorbent assay
melanoma cell vaccine
delayed type hypersensitivity
complementary determinant region
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Kanda, S., Takeyama, H., Kikumoto, Y. et al. Both VH and VL regions contribute to the antigenicity of anti-idiotypic antibody that mimics melanoma associated ganglioside GM3 . Cell Biophysics 24, 65–74 (1994). https://doi.org/10.1007/BF02789216