title: Ontogeny and thymus-dependence of T cell surface antigens in Xenopus: flow cytometric studies on monoclonal antibody-stained thymus and spleen.
abstract: Recently generated anti-Xenopus T cell monoclonal antibodies (mAbs) to the 120 kDa XTLA-1 determinant and against the putative CD5 and CD8 homologues, together with anti-IgM and anti-MHC class II mAbs, are used in dual colour flow cytometric experiments to characterize cell surface antigenic expression on lymphocytes in thymus and spleen of Xenopus laevis during larval and early adult life and also in metamorphosis-inhibited animals. Histological confirmation of T cell emergence early in larval ontogeny is supplied by cryostat sections stained for CD8. Five-day thymectomy, i.e. prior to T-lineage cell differentiation in the thymus, abolishes T cell marker expression in the spleen for up to 1 year. Moreover, late larval (20 days) or early adult (3 months) thymectomy (i.e. removal after peripheralization of T cells has occurred) also leads to severe depletion of mAb-defined T cells in the spleen.
authors.affiliation: Department of Biological Sciences, University of Durham, UK.
authors.forename: I
authors.initials: I
authors.lastname: Gravenor
authors.forename: T L
authors.initials: TL
authors.lastname: Horton
authors.forename: P
authors.initials: P
authors.lastname: Ritchie
authors.forename: E
authors.initials: E
authors.lastname: Flint
authors.forename: J D
authors.initials: JD
authors.lastname: Horton
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte / Q000502:physiology*; D001402:B-Lymphocytes / Q000276:immunology / Q000502:physiology; D015415:Biomarkers; D018956:CD5 Antigens / Q000032:analysis; D016827:CD8 Antigens / Q000032:analysis; D002454:Cell Differentiation / Q000276:immunology; D005434:Flow Cytometry; D000949:Histocompatibility Antigens Class II / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000032:analysis; D007814:Larva / Q000254:growth & development / Q000276:immunology; D018655:Lymphocyte Count; D013154:Spleen / Q000254:growth & development* / Q000276:immunology*; D013194:Staining and Labeling; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism / Q000502:physiology; D013934:Thymectomy; D013950:Thymus Gland / Q000254:growth & development* / Q000276:immunology*; D014982:Xenopus laevis / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D015415:Biomarkers; D018956:CD5 Antigens; D016827:CD8 Antigens; D000949:Histocompatibility Antigens Class II; D007075:Immunoglobulin M