title: Activation of human CD8+ suppressor T cells by an antigen-specific CD4+ T-cell line in vitro.
abstract: We generated an antigen (streptococcal cell wall antigen)-specific T-cell line from peripheral blood mononuclear cells of a healthy donor with an intermediate response to streptococcal cell wall antigen. Proliferation of the T-cell line was completely blocked by a monoclonal antibody to HLA-DR. This line activated autologous CD8+ T cells in an antigen-specific manner in the presence of autologous monocytes. This activation was mediated by a factor derived from this line and was blocked by a monoclonal antibody against HLA class I molecules. The resultant CD8+ T blasts showed antigen-nonspecific suppression but no cytolytic activity. This antigen-specific generation of the CD8+ T-cell line in vitro by the antigen-specific CD4+ T-cell line is expected to contribute to analyses of functions of CD8+ T-cell subsets, particularly in the down-regulating system, at both cellular and molecular levels.
authors.affiliation: Department of Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Fukunaga
authors.forename: K
authors.initials: K
authors.lastname: Hirayama
authors.forename: T
authors.initials: T
authors.lastname: Sasazuki
mesh_terms: D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial / Q000378:metabolism; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D016827:CD8 Antigens; D002460:Cell Line; D002478:Cells, Cultured; D005455:Fluorescent Antibody Technique; D006801:Humans; D009000:Monocytes / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial; D000945:Antigens, Differentiation, T-Lymphocyte; D016827:CD8 Antigens