title: Suppression of adult B cell differentiation in pokeweed mitogen-stimulated cultures by Fc(IgG) receptor-negative T cells from cord blood.
abstract: Unfractionated T lymphocytes from cord blood suppressed adult B cell differentiation into immunoglobulin-producing cells in pokeweed mitogen-stimulated co-culture system. Cord blood T cells were fractionated into T cells bearing Fc receptors for IgG (Tgamma cells) and T cells lacking Fc receptors for IgG(Tnon-gamma cells) by rosette formation with ox erythrocytes coated by the IgG fraction of rabbit antisera followed by Ficoll-Hypaque gradient sedimentation. T gamma cells from cord blood, even though isolated after the interaction with immune complexes, showed no suppressor activity on adult B cell differentiation, whereas Tnon-gamma cells exerted strong suppression to a similar extent to that by unfractionated cord T cells. The suppressor activity on B cell differentiation by Tnon-gamma cell as well as by unfractioned T cells from cord blood was completely abrogated by irradiation with 2000 rads. These results indicated that, contrary to suppressor function found in adult T cells, the suppressor activity in cord T cells might be exerted by a T cell subset lacking Fc receptors for IgG(Tnon-gamma cells).
mesh_terms: D000328:Adult; D001402:B-Lymphocytes / Q000166:cytology*; D002454:Cell Differentiation; D005312:Fetal Blood / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D007165:Immunosuppression Therapy; D007231:Infant, Newborn; D008297:Male; D011043:Pokeweed Mitogens / Q000494:pharmacology*; D011947:Receptors, Antigen, B-Cell / Q000276:immunology; D011961:Receptors, Fc / Q000276:immunology*; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*
chemical_list: D007074:Immunoglobulin G; D011043:Pokeweed Mitogens; D011947:Receptors, Antigen, B-Cell; D011961:Receptors, Fc