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RESEARCH PRODUCT

Secondary cytotoxic allograft responsein vitro. I. Antigenic requirements

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The antigenic requirementsfor in vitro induction of secondary murine cytotoxic allograft responses were tested. The proliferative responses were assayed by the [3H]thymidine uptake technique; the generation of cytotoxic T lymphocytes (CTL) was tested in a 51Cr-cytotoxicity assay. Spleen cells from normal or alloantigen preimmunized CBA mice (H-2k) were used as responder cells. Allogeneic x-irradiated splenic lymphocytes (normal stimulator cells) were UV light treated, heat treated or glutaradehyde fixed and subsequently tested for their capacity to induce CTL in a primary or secondary mixed lymphocyte culture (MLC). In addition allogeneic fibroblasts were tested as stimulator cells. The results obtained suggest that although they fail to trigger significant proliferative and cytotoxic T cell responses, in a primary MLC certain allogeneic stimulator cells, are able to induce strong cytotoxic T cell activity in a secondary MLC. The generation of these secondary CTL is preceded by only marginal cell proliferation.