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Cytotoxic T cell (CTL)-specific activation antigens, termed CT determinants, have been detected by monoclonal antibodies (mAb) that inhibit CTL function. At the cell surface, the CT antigens are associated with the T200 glycoproteins and two other proteins of Mr 140,000 and 85,000 and are present on a secreted protein, gp155. Periodate treatment followed by binding analysis and immunoprecipitation experiments using tunicamycin-treated cells indicated that carbohydrate is necessary for CT antigen expression. Furthermore, gp155 is secreted in the presence of tunicamycin while retaining the CT antigens, and the CT determinants are added late in T200 biosynthesis, suggesting that the CT glycans are O-linked. Finally, interleukin 2 was shown to dramatically influence the expression of the CT mAb-reactive oligosaccharides present at the CTL cell surface.
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