title: Restricted T cell receptor expression by human T cell clones specific for mycobacterial 65-kDa heat-shock protein: selective in vivo expansion of T cells bearing defined receptors.
abstract: We have examined the T cell receptor (TcR) expression of clones specific for epitopes of mycobacterial 65-kDa heat-shock protein (hsp65) in the context of two different HLA molecules, and used this system as a model to assess the selection of T cells responsive to this antigen in vivo. DR3-restricted clones were raised from both the synovial fluid (SF) and peripheral blood (PB) of a patient with reactive arthritis in three separate cloning events. Five of five SF-derived clones tested expressed either V beta 5.2 or a closely related beta chain, V beta 5.6. The alpha chains expressed by V beta 5.2+ and V beta 5.6+ clones were from different families, V alpha 2.4 and V alpha 23.2, respectively. Nine of ten clones derived from two cloning procedures on PB taken 3 years later also expressed either V beta 5.2 or V beta 5.6. This suggests that the TcR repertoire for recognizing this major histocompatibility complex/peptide complex is relatively restricted and favors the use of V beta 5. Conservation of the beta chain third complementarity-determining region (CDR3) sequence was not evident, however. Sequencing alpha and beta chains of representative V beta 5.2+ and V beta 5.6+ PB-derived clones revealed TcR which were identical to those utilized by the SF-derived clones, showing that the repertoire for recognition of this antigen is stable over time. Similar studies of TcR expression were carried out on hsp65-specific, DP4-restricted clones derived from the SF of a patient with rheumatoid arthritis by two independent cloning procedures. There was conservation of alpha chain usage, since all clones expressed a member of the V alpha 1 family, but again CDR3 sequence conservation was not apparent. beta chain usage was not restricted since different clones expressed V beta 6.7, V beta 22.3 and V beta 12. Subtle differences in epitope specificity were detected for two clones with differing TcR. Once more, T cell clones with identical alpha and beta TcR chains were obtained from the separate cloning procedures, suggesting oligoclonalty of T cells with this defined specificity in the patient's SF.
authors.affiliation: Department of Rheumatology, University of Birmingham, GB.
authors.forename: J
authors.initials: J
authors.lastname: Henwood
authors.forename: J
authors.initials: J
authors.lastname: Loveridge
authors.forename: J I
authors.initials: JI
authors.lastname: Bell
authors.forename: J S
authors.initials: JS
authors.lastname: Gaston
mesh_terms: D000595:Amino Acid Sequence; D000942:Antigens, Bacterial / Q000737:chemistry / Q000276:immunology*; D001168:Arthritis / Q000276:immunology; D001426:Bacterial Proteins / Q000737:chemistry / Q000276:immunology; D001483:Base Sequence; D002999:Clone Cells; D000939:Epitopes; D015329:Gene Rearrangement, T-Lymphocyte; D006682:HLA-DP Antigens / Q000276:immunology; D059868:HLA-DP beta-Chains; D015803:HLA-DR3 Antigen / Q000276:immunology; D006360:Heat-Shock Proteins / Q000276:immunology*; D006801:Humans; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008969:Molecular Sequence Data; D009166:Mycobacterium leprae / Q000276:immunology*; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D010455:Peptides / Q000276:immunology; D016133:Polymerase Chain Reaction; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000737:chemistry / Q000235:genetics*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D000939:Epitopes; D006682:HLA-DP Antigens; D059868:HLA-DP beta-Chains; C056284:HLA-DPw4 antigen; D015803:HLA-DR3 Antigen; D006360:Heat-Shock Proteins; D009838:Oligodeoxyribonucleotides; D010455:Peptides; D016693:Receptors, Antigen, T-Cell, alpha-beta