Abstract
In the present study the tube LAI assay was used to monitor the isolation of the TSA of 4 different types of human cancers. Each tumour antigen was found to be specific for tumours arising in the organ from which the TSA was initially derived and which were histopathologically similar. Immunochemical studies revealed that these molecules co-isolate with normal human HLA antigens and are associated with beta2m. On Sephadex G-150, the majority of the papain-solubilized tumour antigen eluted in the mol. wt range 70,000-150,000. Analysis of this material by SDS-PAGE and 6M guanidine-HC1 column chromatography indicated that the material is composed of smaller subunits with prominent peaks at approximately 40,000, 25,000 and 12,000 mol. wt. Immunoadsorbent affinity chromatography of the solubilized tumour-membrane constituents on AH-Sepharose-linked horse anti-human-beta2m indicated that the tumour antigens, like HLA molecules, contain a beta2m subunit. The specificity of binding of TSA to the immunoadsorbent columns and the immunologically specific abrogation of LAI reactivity were clearly shown. The present study, therefore, indicates that by the isolation of beta2m, human tumour antigens can also be isolated, since human tumour antigens are associated with beta2m. Whether human TSAs may perhaps be modified histocompatibility antigens remains to be answered. Although the change upon malignant transformation in the pattern of the cell-surface proteins expressing the TSA determinant remains obscure, it would appear that for tumours arising within a given organ, a consistent alteration of cell-surface proteins occurs.
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