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Inhibition of in vitro cytotoxic responses by BCG-induced macrophage-like suppressor cells. II. Suppression occurs at the level of a "helper" T cell.

The principal mode of action of the suppressor cell seemed to reflect a capacity to modify the production and action of a mediator whose production was dependent upon helper (Lyt 1+) T cells. This alloantigen-induced mediator, which augments the proliferation and/or differentiation of cytotoxic T cells, was not produced in mixed lymphocyte cultures containing spleen cells of BCG-infected animals nor by normal spleen cells in the presence of the BCG-induced suppressor cells. Under appropriate conditions, mediator produced from mixed lymphocyte cultures was able to reverse the suppression of primary cytotoxic responses by BCG-induced suppressor cells.