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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Frequency, function and CLA expression of CD4+CD25+FOXP3+ regulatory T cells in bullous pemphigoid.
Experimental Dermatology 2007 January
Bullous pemphigoid (BP) is an autoimmune blistering skin disease associated with autoantibodies to collagen XVII and tissue-separation along the dermo-epidermal junction. We addressed the question whether the loss of tolerance in BP patients is associated with a reduction and/or functional impairment of CD4+CD25+FOXP3+ regulatory T cells, which are essential for the active maintenance of self tolerance. The relative and absolute frequency of CD4+CD25+ and CD4+CD25(high) regulatory T cells in the peripheral blood of newly diagnosed, untreated patients was similar to that of healthy controls. Interestingly, more than 50% of circulating CD4+CD25(high) regulatory T cells from both patients as well as healthy controls expressed cutaneous lymphocyte-associated antigen. Considerable numbers of FOXP3+ cells were detected in lesional skin of patients. CD4+CD25+ regulatory T cells of patients were functionally intact as assessed by their ability to suppress allogeneic as well as antigen-specific T-cell proliferation. These data argue against a general defect of CD4+CD25+FOXP3+ regulatory T cells in patients with BP.
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