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Compromised Function of Regulatory T Cells in Rheumatoid Arthritis and Reversal by Anti-TNFalpha Therapy

Overview
Journal J Exp Med
Date 2004 Jul 29
PMID 15280421
Citations 440
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Abstract

Regulatory T cells have been clearly implicated in the control of disease in murine models of autoimmunity. The paucity of data regarding the role of these lymphocytes in human autoimmune disease has prompted us to examine their function in patients with rheumatoid arthritis (RA). Regulatory (CD4(+)CD25(+)) T cells isolated from patients with active RA displayed an anergic phenotype upon stimulation with anti-CD3 and anti-CD28 antibodies, and suppressed the proliferation of effector T cells in vitro. However, they were unable to suppress proinflammatory cytokine secretion from activated T cells and monocytes, or to convey a suppressive phenotype to effector CD4(+)CD25(-) T cells. Treatment with antitumor necrosis factor alpha (TNFalpha; Infliximab) restored the capacity of regulatory T cells to inhibit cytokine production and to convey a suppressive phenotype to "conventional" T cells. Furthermore, anti-TNFalpha treatment led to a significant rise in the number of peripheral blood regulatory T cells in RA patients responding to this treatment, which correlated with a reduction in C reactive protein. These data are the first to demonstrate that regulatory T cells are functionally compromised in RA, and indicate that modulation of regulatory T cells by anti-TNFalpha therapy may be a further mechanism by which this disease is ameliorated.

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