Journal
JOURNAL OF EXPERIMENTAL MEDICINE
Volume 204, Issue 2, Pages 253-258Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20062211
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Compelling evidence suggests that the epithelial cell-derived cytokine thymic stromal lymphopoietin (TSLP) may initiate asthma or atopic dermatitis through a dendritic cell-mediated T helper (Th)2 response. Here, we describe how TSLP might initiate and aggravate allergic inflammation in the absence of T lymphocytes and immunoglobulin E antibodies via the innate immune system. We show that TSLP, synergistically with interleukin 1 and tumor necrosis factor, stimulates the production of high levels of Th2 cytokines by human mast cells (MCs). We next report that TSLP is released by primary epithelial cells in response to certain microbial products, physical injury, or inflammatory cytokines. Direct epithelial cell-mediated, TSLP-dependent activation of MCs may play a central role in intrinsic forms of atopic diseases and explain the aggravating role of infection and scratching in these diseases.
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