Skin Rashes Research Today is a free monthly online journal that collates and summarizes the latest research about Skin Rashes, including details on dermatitis, itches, creams, medication, treatment. | ||||||||
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Fox-P3-positive regulatory T cells are present in the skin of generalized atopic eczema patients and are not particularly affected by medium-dose UVA1 therapy.Schnopp C, Rad R, Weidinger A, Weidinger S, Ring J, Eberlein B, Ollert M, Mempel M Department of Dermatology and Allergy, Biederstein, Technical University Munich, Munich, Germany. BACKGROUND: Regulatory T cells (T-reg cells) have been described as an important cell population in the UV treatment of inflammatory skin diseases. METHODS: We have treated five patients with generalized atopic eczema (AE) using medium-dose (15 cycles of 50 J/cm(2), total dose of 750 J/cm(2)) UVA1 therapy and have analyzed the skin-infiltrating T-cellular subsets before and after therapy. Skin biopsies were split for immunohistochemistry and Real-time PCR and analyzed for CD4, Fox-P3, GATA-3, and IL-10 transcription as well as for CD3, CD4, CD152, Fox-P3, and GITR staining. RESULTS: In all the investigated patients, we observed a good clinical response to UVA1. As described previously, the number of epidermal T cells slightly declined after irradiation. However, we did not observe a general decrease in T cell numbers. Within the population of T cells, no specific difference in the kinetics of Fox-P3-positive cells and Fox-P3-specific mRNA was noted as compared with GATA-3 positive T cells. These results were paralleled by RT-PCR for IL-10 and staining for CD152, a surface molecule that has been described for T-reg cells. CONCLUSION: In our hands, the clinical benefit of UVA1 treatment in AE patients does not seem to be due to a preferential survival/proliferation of T-reg cells. Published 25 May 2007 in Photodermatol Photoimmunol Photomed, 23(2): 81-5.
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