title: Selective manipulation of the human T-cell receptor repertoire expressed by thymocytes in organ culture.
abstract: A recently described organ culture system for human thymocytes is shown to support the generation of a diverse T-cell receptor repertoire in vitro: thymocytes of the alpha beta lineage, including representatives of the V beta families 5.2/5.3, 6.7, and 8, accounted for the majority of T-cell receptor-positive cells throughout a 3-week culture period. Thymocytes bearing gamma delta receptors were also identified, particularly among the CD4 CD8 double-negative subset. The T-cell receptor repertoire expressed in organ culture responded to experimental manipulation with staphylococcal enterotoxins. Staphylococcal enterotoxin D (a powerful activator of human peripheral T cells expressing V beta 5.2/5.3 receptors) caused a marked reduction of V beta 5.2/5.3 expression, as determined with the V beta-specific antibody 42/1C1. Evidence is presented that this loss of V beta 5.2/5.3 expression resulted from the selective deletion of activated thymocytes by apoptosis, in concert with T-cell receptor modulation. These effects of staphylococcal enterotoxin D were specific (since staphylococcal enterotoxin E did not influence V beta 5.2/5.3 expression) and V beta-selective (since expression of V beta 6.7 remained unaffected by staphylococcal enterotoxin D). On the basis of these observations, we suggest that thymic organ culture provides a powerful approach to study the generation of the human T-cell repertoire.
authors.affiliation: Department of Immunology, Institute de Chimie Biologique, Strasbourg, France.
authors.forename: M
authors.initials: M
authors.lastname: Merkenschlager
authors.forename: A G
authors.initials: AG
authors.lastname: Fisher
mesh_terms: D000818:Animals; D015704:CD4 Antigens / Q000378:metabolism; D016827:CD8 Antigens / Q000378:metabolism; D002478:Cells, Cultured; D004622:Embryo, Mammalian; D005333:Fetus; D005434:Flow Cytometry; D005786:Gene Expression Regulation; D007700:Kinetics; D037102:Lectins; D051379:Mice; D008815:Mice, Inbred Strains; D009924:Organ Culture Techniques; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000378:metabolism*; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology*
chemical_list: D015704:CD4 Antigens; D016827:CD8 Antigens; D037102:Lectins; D011948:Receptors, Antigen, T-Cell