Syngeneic monoclonal antibodies against melanoma antigens with species specificity and interspecies cross-reactivity.

The species-specific and the interspecies cross-reactive melanoma antigenic determinants are defined by the monoclonal antibodies raised by syngeneic immunizations. The two types of monoclonal antibodies (M562 or M622 and M2590) were obtained by the fusion of P3U1 murine myeloma cell lines and spleen cells of C57BL/6 mice hyperimmunized with MMC-treated syngeneic B16 melanoma cells. The M2590 antibody recognizes the cross-species melanoma determinant commonly shared among at least mouse, hamster, and human, while the M562 or M622 antibody reacts with the mouse (B16) melanoma antigenic determinant. The immunochemical and physiochemical characteristics of the melanoma antigens on SDS-PAGE analyses show that these two characteristic determinants are present on the same molecule (molecular weight of 31,000) of a glycoprotein. Furthermore, the interspecies cross-reactive melanoma antigenic determinants are possibly composed of the sugar moiety, whereas the species-specific determinants seem to be proteinaceous in nature.

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