한빛사논문
Siqi Liu,1,7 Yun Ha Hur,1,7 Xin Cai,2 Qian Cong,3 Yihao Yang,1 Chiwei Xu,1 Angelina M. Bilate,4 Kevin Andrew Uy Gonzales,1 S. Martina Parigi,1 Christopher J. Cowley,1 Brian Hurwitz,1 Ji-Dung Luo,5 Tiffany Tseng,1 Shiri Gur-Cohen,1 Megan Sribour,1 Tatiana Omelchenko,1 John Levorse,1 Hilda Amalia Pasolli,6 Craig B. Thompson,2 Daniel Mucida,4 and Elaine Fuchs1,8,*
1Robin Chemers Neustein Laboratory of Mammalian Development and Cell Biology, Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065, USA
2Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
3McDermott Center for Human Growth and Development, Department of Biophysics, and Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
4Laboratory of Mucosal Immunology, Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065, USA
5Bioinformatics Resource Center, The Rockefeller University, New York, NY 10065, USA
6Electron Microscopy Resource Center, The Rockefeller University, New York, NY 10065, USA
7These authors contributed equally
8Lead contact
*Correspondence: Elaine Fuchs
Abstract
Pathogen infection and tissue injury are universal insults that disrupt homeostasis. Innate immunity senses microbial infections and induces cytokines/chemokines to activate resistance mechanisms. Here, we show that, in contrast to most pathogen-induced cytokines, interleukin-24 (IL-24) is predominately induced by barrier epithelial progenitors after tissue injury and is independent of microbiome or adaptive immunity. Moreover, Il24 ablation in mice impedes not only epidermal proliferation and re-epithelialization but also capillary and fibroblast regeneration within the dermal wound bed. Conversely, ectopic IL-24 induction in the homeostatic epidermis triggers global epithelial-mesenchymal tissue repair responses. Mechanistically, Il24 expression depends upon both epithelial IL24-receptor/STAT3 signaling and hypoxia-stabilized HIF1α, which converge following injury to trigger autocrine and paracrine signaling involving IL-24-mediated receptor signaling and metabolic regulation. Thus, parallel to innate immune sensing of pathogens to resolve infections, epithelial stem cells sense injury signals to orchestrate IL-24-mediated tissue repair.
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