Abstract
We show that phorbol esters and Ca2+ ionophores can trigger the lysis of nonantigen-bearing target cells by cytotoxic T lymphocytes. This effect obviates the requirement for antigen-receptor-mediated recognition of the antigen; the intensity of lysis is dose and Ca2+ dependent and requires contact between cytotoxic T lymphocytes and target cells. Using a fluorescence-activated cell sorter to enumerate cytotoxic T lymphocyte-target cell conjugates, we show that phorbol esters at concentrations that triggered lysis of non-antigen-bearing target cells also increased the number of stable conjugates with these target cells. The results point to the importance of the antigen-nonspecific engagements of cytotoxic T lymphocytes in immunologic surveillance. The data also show that the linkage between the T-cell receptor and antigen is not mandatory for conjugate formation, for the strengthening of conjugates, and for lysis.
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Selected References
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