title: Decreased CD4+CD25+bright T cells in peripheral blood of patients with primary Sjogren's syndrome.
abstract: CD4+CD25+bright T cells played a crucial role in the suppression of immune response. Recently, decreased levels of CD4+CD25+bright T cells in the peripheral blood of patients with systemic lupus erythematosus were reported, suggesting the potential role of CD4+CD25+bright T cells in human autoimmune diseases. Primary Sjögren's syndrome (pSS) is another common human systemic autoimmune disease. The present study aimed to investigate the levels of CD4+CD25+bright T cells in pSS and to correlate their levels with some biomarkers of inflammation and immune activation. Thirty-three patients with pSS and 35 age- and sex-matched normal individuals were enrolled in the study. The flowcytometric method was applied in the measurement of CD4+CD25+bright T cells. The results showed that patients with pSS had statistically lower levels of CD4+CD25+bright T cells than normal controls, expressed either as absolute cell numbers (mean+/-SD: 47.07+/-25.53 cells/mm3 versus 79.55+/-34.56 cells/mm3, P<0.001) or as percentages of peripheral blood mononuclear cells (mean+/-SD: 2.79+/-1.06% versus 3.84+/-1.42%, P<0.001) or as percentages of CD4+ T cells (mean+/-SD: 7.85+/-2.62% versus 11.68+/-3.78%, P<0.005). Moreover, there were statistically significant inverse correlations between the levels of CD4+CD25+bright T cells and some parameters of inflammation or immune activation including erythrocyte sedimentation rate, C-reactive protein, IgG and rheumatoid factors. The result suggested that CD4+CD25+bright T cells were likely to play anti-inflammatory and immunosuppressive roles in the pathogenesis of pSS. However, the exact functions of decreased circulating CD4+CD25+bright T cells in pSS need further elucidated.
authors: Section of Rheumatology and Immunology, Department of Internal Medicine, Medical College, National Cheng Kung University, Tainan, Taiwan, Republic of China. mfliu@mail.ncku.edu.tw
authors: M-F
authors: MF
authors: Liu
authors: L-H
authors: LH
authors: Lin
authors: C-T
authors: CT
authors: Weng
authors: M-Y
authors: MY
authors: Weng
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001799:Blood Sedimentation; D002097:C-Reactive Protein / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D016022:Case-Control Studies; D015536:Down-Regulation; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007249:Inflammation / Q000097:blood / Q000276:immunology*; D053645:Interleukin-2 Receptor alpha Subunit / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000097:blood; D012859:Sjogren's Syndrome / Q000097:blood / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D007074:Immunoglobulin G; D053645:Interleukin-2 Receptor alpha Subunit; D002097:C-Reactive Protein; D012217:Rheumatoid Factor