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Synthesis of the cytolytic C9-related protein (C9RP) was induced by activation of resting human peripheral T lymphocytes with the anti-CD3 antibody OKT3 or interleukin 2. Comparison of cellular cytotoxicity and C9RP content at various times during activation yielded a coefficient of correlation r = 0.92. During OKT3 stimulation of peripheral mononuclear cells, maximal C9RP content and cytotoxicity were observed by day 2 or 3, with subsequent decline to baseline values by day 5, whereas during interleukin 2 stimulation, both parameters reached the maximal level at days 3-5. After fluorescence-activated cell sorting, C9RP and cytotoxicity were quantitated in CD4+, CD8+, and Leu-19+ subsets. In OKT3-activated CD8+ cells, C9RP increased to approximately 3 X 10(6) molecules per cell, with a corresponding increase in lysis of human melanoma cells mediated by anti-CD3-anti-melanoma monoclonal antibody conjugates. Interleukin 2-stimulated CD8+ cells showed similar increases, but cytotoxicity was conjugate-independent. Activated CD4+ cells showed minimal increase in C9RP content. Leu-19+ cells, which exhibit natural killer cell activity, had a high C9RP content (approximately 2.5 X 10(6) molecules per cell) before stimulation.

proceedings of the national academy of sciences of the united states of america

Induction of synthesis of the cytolytic C9 (ninth component of complement)-related protein in human peripheral mononuclear cells by monoclonal antibody OKT3 or interleukin 2: correlation with cytotoxicity and lymphocyte phenotype.