In vitro regulation of human hematopoiesis by natural killer cells: analysis at a clonal level.

We studied the effects of a series of well-characterized clones of human natural killer (NK) cells on the proliferation of highly purified normal marrow hematopoietic progenitor cells. Individual NK clones suppressed granulocyte, monocyte, erythroid, or mixed colony formation in a heterogeneous but clonally stable manner. Inhibition of colony growth required a period of close cell contact between NK cell and progenitor cell with maximum inhibition occurring after 8 to 18 hours of preincubation time. The mechanism of killing was at least partially humoral, however, as cell-free supernatants generated by NK clones "activated" by contact with a target cell also inhibited progenitor cell growth. One of the possible humoral mediators was identified as gamma-interferon by studies with specific neutralizing monoclonal antibodies. These results show that clonal NK lines can be further activated by coming in contact with hematopoietic progenitor cells, resulting in substantial inhibition of colony formation in vitro.

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