title: Receptor-like role of HLA-class I antigens: regulation of T cell activation.
abstract: Class I major histocompatibility antigens are known to restrict the cytotoxic activity of T lymphocytes. However, experiments using monoclonal antibodies against class I antigens showed that these antigens also play some role in the regulation of T cell activation. Three monoclonal antibodies, namely W6/32 (anti-class I HLA-A, B, C, antigens), 4E (anti-class I HLA-B antigens), and BBM.1 (anti-beta 2-microglobulin) significantly suppressed the phytohemagglutinin-induced T cell proliferation. The inhibitory effect of anti-class I antibody was found to depend on the presence of monocyte/macrophage-type adherent cells. In the presence of antibody, adherent cells released a factor that suppressed T cell proliferation. These results suggest that HLA class I antigens on Mo1+ monocyte/macrophage cells function like ligand-receptor molecules, and regulate the secretion of suppressor factor(s).
authors.forename: J D
authors.initials: JD
authors.lastname: Dasgupta
authors.forename: E J
authors.initials: EJ
authors.lastname: Yunis
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D002455:Cell Division; D006680:HLA Antigens / Q000502:physiology*; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects; D008222:Lymphokines / Q000378:metabolism; D008264:Macrophages / Q000276:immunology / Q000378:metabolism; D009000:Monocytes / Q000276:immunology; D010835:Phytohemagglutinins / Q000494:pharmacology; D011971:Receptors, Immunologic / Q000502:physiology*; D013601:T-Lymphocytes / Q000276:immunology*; D001613:beta 2-Microglobulin / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D006680:HLA Antigens; D008222:Lymphokines; D010835:Phytohemagglutinins; D011971:Receptors, Immunologic; D001613:beta 2-Microglobulin