title: Role of new population of peripheral CD11c(+)CD8(+) T cells and CD4(+)CD25(+) regulatory T cells during acute and remission stages in rheumatoid arthritis patients.
abstract: OBJECTIVE
  Rheumatoid arthritis (RA) is a CD4(+)-dependent chronic systemic inflammatory disease with autoimmune features. Autoreactive CD4(+) T-cell activation can result in autoimmune diseases. One of the key regulators is the CD4(+)CD25(high) regulatory T (Treg) cell. In an animal arthritis model, CD11c(+)CD8(+) T cells were found to be elevated, and could suppress pathogenic CD4(+) T cells after cross-linking with CD137. The purpose of this study was to compare the expression of CD137, CD4(+)CD25(high) Treg cells, and CD11c(+)CD8(+) in the peripheral blood T lymphocytes of RA patients during active and remissive states, and evaluate the correlation with disease activity.
  
  
  METHODS
  Thirty nine RA patients treated at the rheumatology outpatient clinic at the Changhua Christian Hospital were assessed clinically for disease activity and classified as either highly active or remissive by the Disease Activity Score 28. Peripheral blood mononuclear cells were isolated from these patients and compared against normal controls.
  
  
  RESULTS
  The presence of CD11c(+)CD8(+) T cells or the expression of CD137 molecules in peripheral blood cells was not related to disease activity. In contrast, CD4(+)CD25(high) Treg cell levels were increased significantly in patients with active RA compared with patients with remissive RA or controls (p<0.05). These lymphocytes were intact, without evidence of apoptosis.
  
  
  CONCLUSIONS
  Our results indicate that CD4(+)CD25(high) Treg cells play an important role in modulating RA disease activity and can serve as a parameter of disease activity.
authors.affiliation: Department of Pediatrics, Changhua Christian Hospital, Changhua, Taiwan.
authors.forename: Jun Kai
authors.initials: JK
authors.lastname: Kao
authors.forename: Yin Tzu
authors.initials: YT
authors.lastname: Hsue
authors.forename: Ching Yuang
authors.initials: CY
authors.lastname: Lin
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000276:immunology* / Q000503:physiopathology; D015415:Biomarkers; D039521:CD11c Antigen / Q000032:analysis*; D015496:CD4-Positive T-Lymphocytes / Q000737:chemistry / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000737:chemistry / Q000276:immunology*; D005260:Female; D006801:Humans; D053645:Interleukin-2 Receptor alpha Subunit / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D053261:Tumor Necrosis Factor Receptor Superfamily, Member 9 / Q000032:analysis
chemical_list: D015415:Biomarkers; D039521:CD11c Antigen; D053645:Interleukin-2 Receptor alpha Subunit; D053261:Tumor Necrosis Factor Receptor Superfamily, Member 9