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Wertheimer, Tobias; Velardi, Enrico; Tsai, Jennifer; Cooper, Kirsten; Xiao, Shiyun; Kloss, Christopher C; Ottmüller, Katja J; Mokhtari, Zeinab; Brede, Christian; deRoos, Paul; Kinsella, Sinéad; Palikuqi, Brisa; Ginsberg, Michael; Young, Lauren F; Kreines, Fabiana; Lieberman, Sophia R; Lazrak, Amina; Guo, Peipei; Malard, Florent; Smith, Odette M; Shono, Yusuke; Jenq, Robert R; Hanash, Alan M; Nolan, Daniel J; Butler, Jason M; Beilhack, Andreas; Manley, Nancy R; Rafii, Shahin; Dudakov, Jarrod A; van den Brink, Marcel R M
Science immunology, 01/2018, Volume: 3, Issue: 19Journal Article
The thymus is not only extremely sensitive to damage but also has a remarkable ability to repair itself. However, the mechanisms underlying this endogenous regeneration remain poorly understood, and this capacity diminishes considerably with age. We show that thymic endothelial cells (ECs) comprise a critical pathway of regeneration via their production of bone morphogenetic protein 4 (BMP4) ECs increased their production of BMP4 after thymic damage, and abrogating BMP4 signaling or production by either pharmacologic or genetic inhibition impaired thymic repair. EC-derived BMP4 acted on thymic epithelial cells (TECs) to increase their expression of , a key transcription factor involved in TEC development, maintenance, and regeneration, and its downstream targets such as , a key mediator of thymocyte development and regeneration. These studies demonstrate the importance of the BMP4 pathway in endogenous tissue regeneration and offer a potential clinical approach to enhance T cell immunity.
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