alexa Elevated interleukin-21 correlated to Th17 and Th1 cells in patients with immune thrombocytopenia.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Zhu X, Ma D, Zhang J, Peng J, Qu X,

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Abstract BACKGROUND: Interleukin-21 (IL-21) is critical in the development of autoimmune diseases. The role of IL-21 in the pathogenesis of immune thrombocytopenia (ITP) remains unknown. MATERIALS AND METHODS: We examined the expression of IL-21, IL-17, and interferon (IFN)-gamma in ITP patients and controls by enzyme-linked immunosorbent assay and flow cytometry. Detection of specific anti-platelet GPIIb/IIIa and/or GPIb/IX autoantibodies was measured by modified monoclonal antibody specific immobilization of platelet antigens. RESULTS: IL-21 was expressed on both CD3(+)CD8(-) T cells and CD3(+)CD8(+) T cells by flow cytometry. Plasma IL-21 level and the percentage of CD3(+)CD8(-)IL-21(+) T cells and CD3(+)CD8(+)IL-21(+) T cells were significantly elevated in ITP patients compared to controls. The percentage of CD3(+)CD8(-)IL-17(+) T (Th17), CD3(+)CD8(-)IFN-gamma(+) T (Th1), and CD3(+)CD8(+)IFN-gamma(+) T (Tc1) cells also significantly increased in ITP patients. Moreover, we found a significant positive correlation between CD3(+)CD8(-)IL-21(+) T cells and Th17 cells. In addition, a positive correlation between CD3(+)CD8(-)IL-21(+) T cells and Th1 cells was also found. CONCLUSION: Together, our results indicated a possible role of IL-21 in ITP patients correlated to Th17 and Th1 cells, and blockade of IL-21 may be a reasonable therapeutic strategy for ITP especially those with active disease. This article was published in J Clin Immunol and referenced in Journal of Clinical & Cellular Immunology

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