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Toda, Masao; Leung, Donald Y.M.; Molet, Sophie; Boguniewicz, Mark; Taha, Rame; Christodoulopoulos, Pota; Fukuda, Takeshi; Elias, Jack A.; Hamid, Qutayba A.
Journal of allergy and clinical immunology, 04/2003, Volume: 111, Issue: 4Journal Article
Background: In atopic dermatitis (AD) there is evidence of tissue fibrosis involving a number of structural changes, including papillary dermal fibrosis and epidermal hyperplasia. These changes are suggested to be the result of chronic inflammation of the skin. Several remodeling-associated cytokines, including transforming growth factor (TGF) β1, IL-11, and IL-17, have been shown to be increased in allergic diseases, including asthma. Objective: We investigated TGF-β1, IL-11, and IL-17 expression in skin biopsy specimens recovered from acute and chronic skin lesions from patients with AD, as well as from uninvolved skin of patients with AD and skin from healthy volunteers. We also examined the correlation between the expression of these cytokines and the extent of total, type I, and type III collagen deposition. Methods: We evaluated the expression of TGF-β1, IL-11, and IL-17 by means of immunohistochemistry. Collagen deposition was assessed by means of immunohistochemistry and van Gieson staining. Results: TGF-β1 expression was markedly enhanced in both acute and particularly chronic lesions ( P < .001). Although IL-11 expression was significantly increased only in chronic lesions ( P < .0001), IL-17 was preferentially associated with acute lesions ( P < .005). Although collagen type III deposition was not significantly different among the groups, type I collagen deposition was significantly increased in chronic AD lesions ( P < .0005). There was a significant correlation between IL-11 and type I collagen deposition, as well as the number of eosinophils in skin specimens from patients with AD ( r 2 = 0.527, and r 2 = 0.622, respectively; P < .0001). Conclusion: These results suggest that TGF-β1, IL-11, and IL-17 are involved in the remodeling of skin lesions in patients with AD. However, IL-11 and IL-17 are preferentially expressed at different stages of the disease. Type I collagen appeared to be the major subtype involved in this repair process.
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