Recent experiments (11-13) have shown that antigen-specific, CD8+, CD4- T lymphocytes can be induced to proliferate and become killer cells in the absence of a second population of "helper" CD8-, CD4+ cells. We have studied early events in the activation of CD4+ and CD8+ T cell subsets in the primary mixed leukocyte reaction. Dendritic cells are a major if not essential accessory cell for the activation of both subpopulations. Antigen-bearing macrophages fail to stimulate unprimed CD8+ cells, but act as targets for the sensitized cytolytic lymphocytes that are induced by dendritic cells. The initial proliferative response is comparable for CD4+ and CD8+ lymphocyte subsets. For both subpopulations, dendritic cells efficiently cluster the responding lymphocytes on the first day and induce the release of IL-2. The data indicate that CD4+ and CD8+ lymphocytes can be activated by a similar mechanism, and illustrate the special role of dendritic cells in the sensitization stage of cell-mediated immunity.
Article| July 01 1987
Direct activation of CD8+ cytotoxic T lymphocytes by dendritic cells.
J W Young
R M Steinman
Online ISSN: 1540-9538
Print ISSN: 0022-1007
J Exp Med (1987) 166 (1): 182–194.
K Inaba, J W Young, R M Steinman; Direct activation of CD8+ cytotoxic T lymphocytes by dendritic cells.. J Exp Med 1 July 1987; 166 (1): 182–194. doi: https://doi.org/10.1084/jem.166.1.182
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