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Increased Tim-3 expression on peripheral T lymphocyte subsets and association with higher disease activity in systemic lupus erythematosus #MMPMID26076826
Song Lj; Wang X; Wang Xp; Li D; Ding F; Liu Hx; Yu X; Li Xf; Shu Q
Diagn Pathol 2015[]; 10 (ä): ä PMID26076826show ga
Background: Both the T cell immunoglobulin domain- and mucin domain-containing molecule-3 (Tim-3) and the death receptor Fas contribute to the pathogenesis of various autoimmune diseases, including systemic lupus erythematosus (SLE). The aim of the present study was to determine whether Tim-3 and Fas are co-expressed on certain peripheral T lymphocyte subsets, and whether this expression is associated with greater disease activity in SLE. Methods: Peripheral blood mononuclear cells were isolated from 46 patients newly diagnosed with SLE and 28 age- and sex-matched healthy controls (HCs). Expression of Tim-3 and Fas on T subsets was analyzed by flow cytometry, while mRNA levels of the Tim-3 ligand galectin-9 and Fas ligand FasL were assayed using real-time RT-PCR. Results: The proportions of CD3+CD4+ and CD3+CD4- T cells expressing Tim-3+ and Tim+Fas+ were significantly higher in patients than in HCs (p?0.05), while the proportions of these subtypes expressing Fas were similar for the two groups. Patients with active SLE, as defined by their score on the SLE Disease Activity Index, had lower proportions of CD3+CD4+ T cells and higher proportions of CD3+CD4+Tim-3+ and CD3+CD4+Tim-3+Fas+ T cells than did patients with stable SLE. Serum levels of complement C3 and C4 proteins, considered as a marker of SLE activity, correlated negatively with proportions of CD3+CD4+ and CD3+CD4- T cells expressing Tim-3. Conclusions: Expression of Tim-3 and co-expression of Tim-3 and Fas on certain peripheral T subsets are associated with disease activity in SLE patients. Future research should examine whether the same is true of other T subsets implicated in SLE, and should explore the potential role(s) of Tim-3 in the disease pathway. Virtual slides: http://www.diagnosticpathology.diagnomx.eu/vs/1855527845145188