title: Differentiation and activation phenotypes of lung T lymphocytes differ from those of circulating T lymphocytes.
abstract: We used dual laser two-color flow cytometry to compare the expression of surface markers associated with activation and with differentiation in lung and peripheral blood T lymphocytes from normal subjects. T cell subsets, defined based on their reactivity with monoclonal antibodies (MAb) OKT3, OKT4, and OKT8, were analyzed for expression of activation antigens as detected by MAbs to the interleukin-2 receptor, the transferrin receptor, and HLA-DR determinants. Whereas circulating T lymphocytes expressed the three activation antigens at low levels, and the total of T4+ and T8+ cells always approximated the number of T3+ cells, lung T lymphocytes of the T3+, T4+, and T8+ populations expressed the activation antigens at variable levels in combinations not seen in circulating lymphocytes, and the sum of T4+ and T8+ cells always exceeded the T3+ total. A proportion of T4+T8+ cells was detected in lung lymphocytes.
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface / Q000032:analysis*; D002453:Cell Cycle; D005260:Female; D005434:Flow Cytometry; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D006801:Humans; D008168:Lung / Q000166:cytology*; D008213:Lymphocyte Activation; D008297:Male; D011971:Receptors, Immunologic / Q000032:analysis; D015375:Receptors, Interleukin-2; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2