Allograft rejection represents a cytotoxic response mediated to a large degree by thymus-derived T lymphocytes (1). The study of such cell-mediated cytotoxic phenomena has been greatly facilitated by the discovery first noted by Hayry and Defendi (2) and Wunderlich and Cany (3), that a natural consequence of allogeneic stimulation in an unidirectional mixed lymphocyte culture (MLC) was the appearance of cytotoxic lymphocytes specific for antigens present on the stimulator cells. Subsequent studies have shown that such in vitro generation of cytotoxic lymphocytes was dependent on the proliferative response in an MLC (4), was genetically determined (5), and possibly required the interaction of several subpopulations of T cells (6).

We now report that the surface active agent chlorpromazine: (a) inhibits allogeneic stimulation of the proliferative response in an MLC; (b) inhibits the MLC generation of cytotoxic lymphocytes, (c) has no effect on the recognition, binding, or lysis of target cells by already sensitized lymphocytes; and (d) blocks a postproliferative membrane-mediated event, independent of proliferation, and necessary for the MLC generation of cytotoxic lymphocytes.
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