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Free Content Patients with Wegener’s granulomatosis demonstrate a relative deficiency and functional impairment of T-regulatory cells

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Summary

An increased proportion of CD4+ CD25+ T cells has been reported in Wegener’s granulomatosis (WG) and may represent an accumulation of regulatory T cells (Treg). CD25 is also expressed on recently activated effector T cells. We have determined the relative proportion of these subsets in a large patient cohort. The fraction of Treg in peripheral blood mononuclear cells from patients and healthy controls was determined by assessment of Foxp3 expression on CD4+ CD25+ T cells. The functional activity of Treg was determined by their ability to suppress proliferation and cytokine production in response to proteinase-3. Although WG patients demonstrated an increased fraction of CD4+ CD25+ T cells, the percentage of Foxp3-positive cells was decreased. In addition, the percentage of Treg was inversely related to the rate of disease relapse. CD4+ CD25hi T cells were able to suppress T-cell proliferation to proteinase-3 in healthy controls and anti-neutrophil cytoplasm antibody (ANCA)- negative patients (at time of sampling) but not in ANCA-positive patients. In patients with active disease, an increased proportion of CD4+ Foxp3+ cells was associated with a more rapid disease remission. Patients with WG demonstrate abnormalities in the number and function of Treg and this is most pronounced in those with most active disease. This information is of value in understanding the pathogenesis and potential treatment of this disease.
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Keywords: T cells; Wegener’s granulomatosis; autoimmune diseases; autoimmunity; systemic vasculitis

Document Type: Research Article

Affiliations: 1: CRUK Institute of Cancer Studies, College of Medical and Dental Sciences, University of Birmingham, Birmingham 2: Division of Immunology, School of Infection and Host Defence, University of Liverpool, Liverpool, UK 3: Renal Immunobiology, School of Immunity and Infection

Publication date: May 1, 2010

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