title: Immunologic functions of isolated human lymphocyte subpopulations. III. Specific allogeneic lympholysis mediated by human T cells alone.
abstract: The studies presented herein have evaluated both the specificity and cellular basis of cell-mediated lympholysis (CML) in man. An efficient and quantitative 51Cr release assay was utilized to study the role of highly purified human T and B cells in CML. After in vitro sensitization human T cells develop the capacity to kill specifically allogeneic cells to which they were sensitized. In contrast, B cells were neither triggered to proliferate nor activated to kill allogeneic targets. B cells were not activated to kill even when sensitized in the presence of potentially "helper" T cells, nor did they block T cells from killing during the effector phase. Cell-free supernatants taken from active in vitro sensitization cultures were not lympholytic and did not modulate T cell killing. Hence, these studies show that both the afferent and efferent phases of human CML are T cell functions.
mesh_terms: D000918:Antibody Specificity; D001402:B-Lymphocytes / Q000276:immunology; D002469:Cell Separation; D002478:Cells, Cultured; D002860:Chromium Radioisotopes; D003601:Cytotoxicity Tests, Immunologic; D006801:Humans; D037102:Lectins; D007959:Lymphocyte Culture Test, Mixed; D013601:T-Lymphocytes / Q000276:immunology*; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D002860:Chromium Radioisotopes; D037102:Lectins; D014316:Tritium; D013936:Thymidine