title: Enrichment of differentiated CD45RBdim,CD27- memory T cells in the peripheral blood, synovial fluid, and synovial tissue of patients with rheumatoid arthritis.
abstract: OBJECTIVE
  To delineate in greater detail the phenotype of T cells that reside in the synovial tissue (ST) and synovial fluid (SF) of patients with rheumatoid arthritis (RA), in order to determine their precise differentiation status, and to determine whether the accumulation of these specific T cell subsets in these synovial compartments could be related to their capacity for transendothelial migration.
  
  
  METHODS
  Lymphocytes from normal subjects or from the peripheral blood (PB), ST, and/or SF of RA patients were phenotypically analyzed by flow cytometry. Normal PB CD4+ T cells were also characterized using an in vitro assay of transendothelial migration.
  
  
  RESULTS
  ST and SF were found to be enriched with memory (CD45RA-,CD45RO+,CD11abright,CD44bright and activated (CD69+) T cells. Moreover, ST and SF cells from RA patients were enriched in differentiated CD4+,CD45RBdim,CD27- T cells, a subset of mature memory T cells that develops after prolonged antigenic stimulation. In addition, PB of some RA patients contained an increased number of CD4+,CD45RBdim,CD27- T cells. The CD4+,CD11abright,CD44bright memory T cells, which included the CD45RBdim,CD27- more mature memory cells, exhibited an enhanced capacity for transendothelial migration that is likely to contribute to their enrichment in the rheumatoid synovium.
  
  
  CONCLUSIONS
  RA patients manifest an increased number of mature memory T cells in the SF and ST, and some also have an increased number of these cells in PB that is likely to reflect chronic antigenic stimulation. The enrichment of these cells in the SF and ST reflects, in part, an enhanced capacity to migrate from the vascular space into inflamed tissue.
authors.affiliation: University of Texas Southwestern Medical Center, Dallas 75235-8577, USA.
authors.forename: C L
authors.initials: CL
authors.lastname: Kohem
authors.forename: R I
authors.initials: RI
authors.lastname: Brezinschek
authors.forename: H
authors.initials: H
authors.lastname: Wisbey
authors.forename: C
authors.initials: C
authors.lastname: Tortorella
authors.forename: P E
authors.initials: PE
authors.lastname: Lipsky
authors.forename: N
authors.initials: N
authors.lastname: Oppenheimer-Marks
mesh_terms: D001172:Arthritis, Rheumatoid / Q000097:blood / Q000276:immunology* / Q000473:pathology; D001773:Blood Cells / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000502:physiology; D002465:Cell Movement; D006801:Humans; D018960:Hyaluronan Receptors / Q000032:analysis; D007156:Immunologic Memory; D007596:Joints / Q000276:immunology*; D017493:Leukocyte Common Antigens / Q000032:analysis*; D008213:Lymphocyte Activation; D016169:Lymphocyte Function-Associated Antigen-1 / Q000032:analysis; D013582:Synovial Fluid / Q000276:immunology; D013583:Synovial Membrane / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000032:analysis*
chemical_list: D018960:Hyaluronan Receptors; D016169:Lymphocyte Function-Associated Antigen-1; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D017493:Leukocyte Common Antigens