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Verhagen, J.* ; Akdis, M.* ; Traidl-Hoffmann, C. ; Schmid-Grendelmeier, P.* ; Hijnen, D.* ; Knol, E.F.* ; Behrendt, H. ; Blaser, K.* ; Akdis, C.A.*

Absence of T-regulatory cell expression and function in atopic dermatitis skin.

J. Allergy Clin. Immunol. 117, 176-183 (2006)

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BACKGROUND: The role of regulatory T cells has been widely reported in the suppression of T-cell activation. A dysfunction in CD4(+)CD25(+) T-regulatory cell-specific transcription factor FoxP3 leads to immune dysregulation, polyendocrinopathy, enteropathy X-linked syndrome, often associated with atopic dermatitis. Increasing the number and activity of regulatory T cells in affected organs has been suggested as a remedy in various inflammatory diseases, including allergy. OBJECTIVE: To determine the presence and function of regulatory T cells in atopic dermatitis. METHODS: Immunohistochemistry of lesional atopic dermatitis skin and control skin conditions was used to demonstrate regulatory cells and cytokines in situ. The role of effector and regulatory T cells as well as their specific cytokines in apoptosis in human keratinocyte cultures and artificial skin equivalents was investigated. RESULTS: Human T-regulatory type 1 cells, their suppressive cytokines, IL-10 and TGF-beta, as well as receptors for these cytokines were significantly expressed, whereas CD4(+)CD25(+)FoxP3(+) T-regulatory cells were not found in lesional and atopy patch test atopic dermatitis or psoriasis skin. Both subsets of regulatory T cells suppress the allergen-specific activation of T(H)1 and T(H)2 cells. In coculture and artificial skin equivalent experiments, subsets of T-regulatory cells neither induced keratinocyte death nor suppressed apoptosis induced by skin T cells, T(H)1 cells, IFN-gamma, or TNF-alpha. CONCLUSION: A dysregulation of disease-causing effector T cells is observed in atopic dermatitis lesions, in association with an impaired CD4(+)CD25(+)FoxP3(+) T-cell infiltration, despite the expression of type 1 regulatory cells in the dermis.

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