title: A cytolytic human T lymphocyte clone differentially recognizing HLA-B27 subtypes.
abstract: A cytolytic human T cell (CTL) clone, designated F/M-F159, has been produced, the lytic specificity of which distinguishes subtypes of HLA-B27. This was demonstrated in cell-mediated lympholysis (CML) assays of: 1) a panel of target cells from unrelated donors, 75 B27 + and 36 B27-; 2) six families, including 20 B27 + and 14 B27- individuals; and 3) B27 + and B27- variants of a B27+ lymphoblastoid cell line (LCL). Specificity of F/M-F159 for HLA-B27 was confirmed by blocking studies with monoclonal antibodies. Lysis of B27 + targets reactive with the anti-B27 monoclonal antibody B27M2 was 30-104%, while lysis of B27 +, B27M2- targets was 4-22%. Lysis of B27- targets expressing HLA-Bw47, known to be cross-reactive with the B27M2 antibody, was 10 to 19%, while lysis of all other B27- targets was less than or equal to 10%. Clone F/M-F159 lysed B27 + targets, and failed to lyse B27- targets, irrespective of the clinical status of the cell donors. It is concluded that F/M-F159 recognizes an epitope present on the majority of serologically identified HLA-B27 molecules and that this epitope is closely related to, but not identical with, the epitope recognized by the antibody B27M2. These findings are interpreted as supporting a direct role for HLA-B27 in disease pathogenesis.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D001667:Binding, Competitive; D002999:Clone Cells / Q000276:immunology; D000939:Epitopes / Q000276:immunology; D006680:HLA Antigens / Q000276:immunology*; D015796:HLA-B27 Antigen; D006801:Humans; D013167:Spondylitis, Ankylosing / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014606:Uveitis, Anterior / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D006680:HLA Antigens; D015796:HLA-B27 Antigen