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In the absence of antigenic or mitogenic stimulation, certain peripheral blood lymphocytes exhibit proliferative and lymphokine-activated killer (LAK) cell activities when cultured with recombinant IL-2. Both activities were found to be an exclusive property of lymphocytes expressing type 3 complement receptors (CR3) identified by anti-CD11 monoclonal antibodies. CD11+ lymphocytes were then fractionated into three subsets by two-color flow cytometry. These included CD16+ cells, which display distinctive Fc receptors for IgG (CD16). Using anti-CD5, the CD11+ CD16- lymphocytes were separated into non-T cell and T cell subsets. The two non-T cell subsets (CD11+ CD16+ and CD11+ CD16- CD5-), but not the T cell subset (CD11+ CD16- CD5+), could proliferate in response to IL-2. Both CD11+ non-T cell subsets, but not the CD11+ T cell subset, had the capacity to mediate natural killer cell activity. However, all three CD11+ lymphocyte subsets were capable of generating LAK activity. These findings are consistent with the concept that two signals are required to stimulate T cells to proliferate. However, at least a small subset of blood T cells can be activated by IL-2 to become LAK cells.

the journal of clinical investigation/the journal of clinical investigation

Lymphocytes expressing type 3 complement receptors proliferate in response to interleukin 2 and are the precursors of lymphokine-activated killer cells.