title: Characterization of the porcine gammadelta T-cell receptor structure and cellular distribution by monoclonal antibody PPT27.
abstract: The T-cell receptor (TCR) is the critical structure involved in antigen recognition of T lymphocytes. Although the pig has a large proportion of circulating T lymphocytes bearing the gammadelta TCR, their study has been impeded due to the lack of specific antibodies. Here a monoclonal antibody (mAb) PPT27 directed to gammadelta TCR is described. Flow cytometry analyses showed that the mAb recognized a subset of T lymphocytes of which the majority expressed no CD2, CD4 and CD8 whilst the minority bore CD2 and CD8. The mAb precipitated a protein of 86 000 MW under non-reducing conditions and a doublet of 43 000 MW under reducing conditions from peripheral blood T lymphocytes lysed in nonidet P-40 buffer, whilst it precipitated the CD3-TCR complex from the cells lysed in digitonin. Further analysis revealed that the antibody recognized the majority, but not all, of the gammadelta T cells, suggesting that there may be more isotypes of gammadelta TCR than currently believed. The antibody was unable to stimulate gammadelta T cells to proliferate in vitro, suggesting that these cells are activated by a different activation mechanism from that of alphabeta T cells.
authors.affiliation: Immunology Division, BBSRC Institute for Animal Health, Pirbright, Surrey, UK.
authors.forename: H
authors.initials: H
authors.lastname: Yang
authors.forename: R M
authors.initials: RM
authors.lastname: Parkhouse
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000302:isolation & purification / Q000494:pharmacology*; D018801:CD2 Antigens / Q000032:analysis; D016827:CD8 Antigens / Q000032:analysis; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D005260:Female; D005434:Flow Cytometry; D008213:Lymphocyte Activation / Q000276:immunology; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D020033:Protein Isoforms / Q000276:immunology / Q000378:metabolism; D017260:Receptor-CD3 Complex, Antigen, T-Cell / Q000276:immunology; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000276:immunology* / Q000378:metabolism; D013552:Swine / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D014018:Tissue Distribution
chemical_list: D000911:Antibodies, Monoclonal; D018801:CD2 Antigens; D016827:CD8 Antigens; D020033:Protein Isoforms; D017260:Receptor-CD3 Complex, Antigen, T-Cell; D016692:Receptors, Antigen, T-Cell, gamma-delta