title: Co-expression of CD25 and CD3 in atopic allergy and asthma.
abstract: In an attempt to identify the phenotype of the CD25+ cells previously demonstrated in late-phase allergic reactions in skin and nasal mucosa, and in the bronchial mucosa in atopic asthma we have investigated the co-expression of CD3 and CD25 using double immunofluorescent staining. Fluorescein isothiocyanate (FITC) conjugated anti-CD3 monoclonal antibody and a biotinylated anti-CD25 monoclonal antibody (which was later developed with Texas Red streptavidin) were applied simultaneously to cryostat sections or cytospins of freshly prepared samples. Skin and nasal biopsies were from antigen-induced late-phase reactions, and bronchial biopsies and cytospins of bronchoalveolar lavage cells were from subjects with moderate atopic asthma. Four to 14% of CD3+ cells in these tissues were CD25+ and 61-100% of CD25+ cells also expressed CD3. However, CD25 was also expressed on non-CD3+ cells, assumed to be non-T cells. These results were comparable to that observed with a positive control of a tuberculin-challenged skin biopsy. Thus the majority of cells expressing CD25 in various types of atopic allergic inflammation in man were T lymphocytes.
authors.affiliation: Department of Allergy and Clinical Immunology, National Heart and Lung Institute, London, U.K.
authors.forename: Q
authors.initials: Q
authors.lastname: Hamid
authors.forename: J
authors.initials: J
authors.lastname: Barkans
authors.forename: D S
authors.initials: DS
authors.lastname: Robinson
authors.forename: S R
authors.initials: SR
authors.lastname: Durham
authors.forename: A B
authors.initials: AB
authors.lastname: Kay
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D001249:Asthma / Q000276:immunology*; D001980:Bronchi / Q000276:immunology; D017252:CD3 Complex; D005455:Fluorescent Antibody Technique; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000276:immunology*; D009296:Nasal Cavity / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000032:analysis*; D015375:Receptors, Interleukin-2 / Q000032:analysis*; D012867:Skin / Q000276:immunology
chemical_list: D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D011948:Receptors, Antigen, T-Cell; D015375:Receptors, Interleukin-2