Three monoclonal antibodies defining distinct differentiation antigens associated with different high molecular weight polypeptides on the surface of human embryonal carcinoma cells.

Two monoclonal antibodies (TRA-1-60 and TRA-1-81) recognizing distinct cell surface antigens on human embryonal carcinoma (EC) cells were produced and characterized. These antibodies reacted strongly with undifferentiated human EC cells in indirect radioimmunoassays (RIA) and immunofluorescence (IF) assays, but only weakly or not at all with cells derived from pluripotent EC cells differentiating in vitro or in xenograft tumors, nor with other germ cell tumor cell lines that did not also express the typical features of human EC cells. They did not react with murine teratocarcinoma cell lines. A survey of other human tumor cell lines and normal human tissues disclosed that molecules recognized by these antibodies are not confined to human EC cells but that cross-reacting epitopes appear on several neoplastic and normal tissues, although in a different anatomical pattern for each antibody. Both antibodies immunoprecipitated a major polypeptide (apparent molecular weight approximately 240,000) and a minor polypeptide (apparent molecular weight approximately 415,000) from lysates of 125I surface-labeled human EC cells, in this respect resembling another monoclonal antibody, 8-7D, previously described by Blaineau et al. (1,2) However, sequential immunoprecipitation revealed that each of the three antibodies reacted with different molecules of slightly different molecular weights. The epitopes defined by the present antibodies differ from those recognized by the other human EC cell-specific monoclonal antibodies that have been described and provide new markers for studying the differentiation of pluripotent human EC cells.

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