title: Suppression of immunoglobulin production by germinal centre HNK-1+ CD3+ cells.
abstract: Germinal centre T cells co-expressing HNK-1 antigen have little lytic activity against NK targets (K562 cells). In order to determine whether these cells regulate B cell function, they were purified from human tonsils by panning on anti-HNK-1 antibody coated Petri dishes and co-cultured with autologous and allogeneic tonsillar T and B cells in the presence of pokeweed mitogen. At the end of 7 days of culture, supernatants were assayed for immunoglobulin concentration by ELISA. A dose-dependent suppression of both IgG and IgM production was demonstrated at ratios from 1:125 to 1:16 of HNK-1+ cells to B cells, but enhancement was observed at very low ratios (less than 1:500) or ratios exceeding 1:16 in some tonsil preparations. Similar results were obtained with peripheral blood HNK-1+ cells but without enhancement in some cases at the extremes of HNK-1+ cells to B cell ratios. The suppression was not MHC-restricted. These preliminary experiments indicate that germinal centre HNK-1+ cells may be intrafollicular suppressor cells.
authors.affiliation: Department of Pathology and Medicine, University of Western Ontario, London, Canada.
authors.forename: D
authors.initials: D
authors.lastname: Banerjee
authors.forename: J
authors.initials: J
authors.lastname: Baril
authors.forename: D A
authors.initials: DA
authors.lastname: Bell
authors.forename: D
authors.initials: D
authors.lastname: McFarlane
authors.forename: R
authors.initials: R
authors.lastname: Karim
mesh_terms: D000917:Antibody Formation; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D002478:Cells, Cultured; D004306:Dose-Response Relationship, Immunologic; D006801:Humans; D066298:In Vitro Techniques; D007694:Killer Cells, Natural / Q000276:immunology*; D008285:Major Histocompatibility Complex; D014066:Palatine Tonsil / Q000166:cytology / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte