Abstract
Lymphocytes sensitized in mixed leucocyte culture (MLC) were restimulated with non-T or complete cells. Cells primed against autologous non-T cells and restimulated with autologous cells gave responses with the kinetics of a secondary response. In contrast, cells primed against either type of autologous cell responded to restimulation by allogeneic cells with the kinetics of a primary MLC response. Following priming against alloantigens good secondary responses against both complete and non-T allogeneic restimulators were seen. Restimulation with autologous non-T cells, but not autologous complete cells, also led to secondary responses. The observation of different responses to antigens expressed on non-T autologous lymphocytes, in comparison to complete cells, implies that the secondary MLC involves more than response against alloantigens. Allogeneic and autologous MLC may be qualitatively different phenomena, the latter representing the recognition of identifying structures between interacting populations of cooperating cells.
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