title: Dual CD45RA, CD45RO positive T-lymphocytes within rheumatoid arthritic joints.
abstract: This report documents the presence of an expanded population of dual CD45RA, CD45RO positive T cells (up to 91% of T cells) in the rheumatoid joint. Cells from peripheral blood (PB) and synovial fluid (SF) were analysed by dual immunofluorescence labelling. Synovium from a separate patient population was analysed by single and dual immunoenzyme staining of serial sections. Dual CD45RA, CD45RO positive T cells were found in PB (up to 74%), SF (up to 91%) and synovium. This was associated with a lack of early activation antigens (4F2, interleukin-2 receptor, transferrin receptor) but increased HLA-Class II antigens (HLA-DR, -DP, -DQ) in SF compared with PB. This intermediate activation phenotype may support the hypothesis that T cell activation or reactivation occurs within the rheumatoid joint.
authors.affiliation: Department of Rheumatology, Christchurch Hospital, New Zealand.
authors.forename: M D
authors.initials: MD
authors.lastname: Hoy
authors.forename: J L
authors.initials: JL
authors.lastname: O'Donnell
authors.forename: D N
authors.initials: DN
authors.lastname: Hart
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000097:blood / Q000276:immunology*; D005260:Female; D006801:Humans; D017493:Leukocyte Common Antigens / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D013582:Synovial Fluid / Q000276:immunology*; D013583:Synovial Membrane / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D017493:Leukocyte Common Antigens