Abstract
The data on polarization of the immune system towards T helper 1 (Th1) or T helper 2 (Th2) cells in immune thrombocytopenic purpura (ITP) are limited and contradictory. Th17 characterized by the production of Interleukin 17 (IL-17) has been shown to play a crucial part in the induction of autoimmune diseases. To further investigate the role of Th cytokines in the pathogenesis of ITP, we measured the plasma concentration of three Th17-associated cytokines [IL-17, transforming growth factor-ß (TGF-ß), IL-6] and Th1 cytokine interferon-γ (IFN-γ) in ITP patients, and evaluated their clinical relevance. The concentration of IL-17, TGF-ß, IL-6, and IFN-γ in plasma specimens from 29 adults with chronic ITP and 38 controls was analyzed by enzyme-linked immunosorbent assay method. No significant differences of Th17 cytokines (IL-17, TGF-ß, and IL-6) and Th1 cytokine (IFN-γ) concentration were observed between patients with active ITP and the control group. And the IFN-γ/IL-17 ratio representing Th1/Th17 cytokine profile was not significantly different between ITP patients and control, either. However, significantly positive correlation between IL-6 and IFN-γ in ITP patients was observed (r = 0.48, P = 0.01). Among the ITP patients, Plasma IL-17 levels in male were marginally higher than those in female, while similar for TGF-ß, IL-6 or IFN-γ. There was a significantly positive correlation between age and IL-6 concentration in ITP patients (r = 0.56, P = 0.0002), while no statistical significance between age and the other three cytokines. No significant correlation between cytokine concentrations and platelets or megakaryocytes number was found in ITP patients. In summary, ITP may not be associated with changes of plasma Th17 and Th1 cytokine concentrations relative to control population.
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Acknowledgements
We would like to thank Dr. Fengqiang Wang and Cheng Liu for their reviewing and suggesting changes to the manuscript. This study was partially supported by grants from the National Natural Science Foundation (30600680, 30770922, 30470742, 30570779, 30600259, 30628015 and 30300312), 973 Project (2006CB503800), Key Clinical Research Project of Chinese Ministry of Health (2007–2009), Research Project of National Public Fare (200802031), and the Shandong Technological Development Project (2005BS03022).
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Ma, D., Zhu, X., Zhao, P. et al. Profile of Th17 cytokines (IL-17, TGF-β, IL-6) and Th1 cytokine (IFN-γ) in patients with immune thrombocytopenic purpura. Ann Hematol 87, 899–904 (2008). https://doi.org/10.1007/s00277-008-0535-3
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DOI: https://doi.org/10.1007/s00277-008-0535-3