特应性皮炎
免疫学
免疫球蛋白E
细胞因子
归巢(生物学)
医学
生物
抗体
生态学
作者
M. Akdis,C A Akdis,L. Weigl,Reiner Disch,Kurt Blaser
出处
期刊:Journal of Immunology
[The American Association of Immunologists]
日期:1997-11-01
卷期号:159 (9): 4611-4619
被引量:156
标识
DOI:10.4049/jimmunol.159.9.4611
摘要
Cutaneous lymphocyte-associated Ag (CLA) is a skin-homing receptor displayed by memory/effector T cells recognizing skin-related allergens. Here we demonstrate that peripheral blood CLA+ CD45RO+ T cells in patients with atopic dermatitis (AD) are in vivo activated. They spontaneously proliferate and release an IL-13-dominated Th2 cytokine profile and are capable of inducing IgE in autologous B cells without further activation. The spontaneous cytokine release occurred within the first hour of culture and was not inhibited by cycloheximide or by other immunosuppressive drugs, indicating that cytokine transcription and translation had been completed in vivo. In contrast, the CLA- CD45RO+ T cells from the same patients and from nonatopic controls represented a resting memory T cell subset, secreted borderline quantities of cytokines, and induced IgG4. Polyclonal activation by the anti-CD2/anti-CD3/anti-CD28 mAb mixture generated distinct cytokine patterns in the two memory/effector T cell subsets. CLA+ T cells secreted Th2 cytokines with high IL-13 levels, and the CLA- subset mainly produced IFN-gamma. There was no difference in in vitro activated cytokine pattern between AD patients and nonatopic subjects. These results indicate that the CLA+ memory/effector T cells of AD patients are activated in vivo and play a pivotal role in allergic inflammation by production of IL-13 and induction of IgE Abs. In contrast, the CLA- resting memory T cell population may exert immunoprotective properties toward allergen by high IFN-gamma secretion and induction of IgG4.
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