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CD4+ T cells from SLE patients respond poorly to exogenous IL-2 #MMPMID27992687
Comte D; Karampetsou MP; Kis-Toth K; Yoshida N; Bradley SJ; Kyttaris VC; Tsokos GC
Arthritis Rheumatol 2017[Apr]; 69 (4): 808-13 PMID27992687show ga
Objective: Imbalanced cytokine production by T cells characterizes both patients with SLE and lupus-prone mice and contributes to immune dysregulation. In this study, we further characterize in detail the production of IL-2, IFN?, IL-4 and IL-17A by CD4+ subsets in healthy subjects and SLE patients and the signaling response of CD4+ T cells in response to exogenous IL-2. Methods: Cytokine production by CD4+ T cell differentiated subsets was assessed by intracellular staining following stimulation with phorbol myristate acetate and ionomycin and by ELISA after anti-CD3/anti-CD28 stimulation. IL-2 signaling pathway was examined by assessing Jak3 and STAT5 phosphorylation. Cell proliferation in response to IL-2 was examined by CFSE dilution. Results: Production of IL-2 was defective primarily among naïve CD4+ T cell, whereas the production of IFN?, IL-4 and IL-17A was not significantly different among SLE patients and healthy subjects. Jak3 and STAT5 phosphorylation and proliferation of SLE CD4+ T cells in response to exogenous IL-2 were impaired compared to that of healthy subjects. Conclusion: These data suggest that altered IL-2 production, as well as impaired IL-2-mediated signaling and proliferative responses characterize SLE CD4+ T cells. Our data suggest caution in designing IL-2 treatment trials for patients with SLE. Approaches to restore CD4+ T cell sensitivity to IL-2 should be considered along the way.