title: Induction of suppression through human T cell interactions.
abstract: Concanavalin A (Con A) activated T cells, devoid of cells bearing Fc receptors for IgG (T - TG) help human B lymphocytes to differentiate into plasma cells (PC) in response to pokeweed mitogen (PWM). PC differentiation is reduced when adult T cells are added to such cultures. The radiosensitivity of suppression and the radioresistance of help enabled us to show that adult T cells include a suppressor-precursor which is activated by irradiated Con A-precultured T cells. Newborn T cells which include active suppressors, are both poor stimulators of suppressor-precursors and poor helpers of B cells. Our results suggest that at least two cells may mediate Con A-induced suppression, one which suppresses directly and is radiosensitive and another which is radioresistant and stimulates suppressor-precursors in a target population of T cells.
mesh_terms: D000328:Adult; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology; D002454:Cell Differentiation / Q000187:drug effects / Q000528:radiation effects; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology; D006801:Humans; D006854:Hydrocortisone / Q000494:pharmacology; D007231:Infant, Newborn; D008211:Lymphocyte Cooperation; D010950:Plasma Cells / Q000276:immunology; D011043:Pokeweed Mitogens / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology* / Q000528:radiation effects; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D011043:Pokeweed Mitogens; D003208:Concanavalin A; D006854:Hydrocortisone