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Learn MoreEnvironmental challenges to epithelial cells trigger gene expression changes that elicit context-appropriate immune responses. Here we show that the chromatin remodeler Mi-2 controls epidermal homeostasis by holding genes involved in keratinocyte and immune-cell activation at an inactive state. Mi-2 depletion caused rapid deployment of both a pro-inflammatory and an immunosuppressive response in the skin. A key target of Mi-2 in keratinocytes was the pro-inflammatory cytokine Thymic Stromal Lymphopoietin (TSLP). Loss of TSLPR signaling specifically in regulatory T cells (Treg) prevented their activation and permitted rapid progression from a skin pro-inflammatory response to a lethal systemic condition. Thus, in addition to their well-characterized role in pro-inflammatory responses, keratinocytes also directly support immune-suppressive responses that are critical for re-establishing organismal homeostasis. SOURCE: Katia Georgopoulos (katia.georgopoulos@cbrc2.mgh.harvard.edu) - Georgopoulos Harvard Medical School
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