title: Activation of human B lymphocytes. V. Kinetics and mechanisms of suppression of plaque-forming cell responses by concanavalin A-generated suppressor cells.
abstract: The kinetics and mechanisms of suppression of the PWM-induced PFC response of human PB lymphocytes by Con A-activated suppressor cells were investigated. It was necessary that Con A suppressor cells be present early in the process of activation of human B cells toward antibody syntheses, but maximal suppression of the PFC response occurred later in the culture period. In addition, Con A-activated cells, although suppressing the PFC response to PWM greater that 90% of control, did not significantly suppress the blastogenic response to PWM after 3 or 5 days in culture. On the contrary, after 3 days in culture, background tritiated thymidine incorporation as well as tritiated thymidine incorporation to PWM stimulation was increased when Con A suppressor cells are added to fresh autologous peripheral blood lymphocytes. This increased blastogenic response after three days most likely represented an autologous mixed lymphocyte reaction (MLR) or Con A suppressor cells against fresh autologous non-T cells. The induction of autoreactive cells may be one of several modes of suppression of PFC responses by Con A activated suppressor cells.
mesh_terms: D000921:Antibody-Producing Cells / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology*; D006462:Hemolytic Plaque Technique; D006801:Humans; D007165:Immunosuppression Therapy; D007700:Kinetics; D037102:Lectins / Q000494:pharmacology; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008937:Mitomycins / Q000494:pharmacology; D013997:Time Factors
chemical_list: D037102:Lectins; D008937:Mitomycins; D003208:Concanavalin A