Journal
NATURE MEDICINE
Volume 23, Issue 8, Pages 938-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nm.4373
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [RA 2506/3-1, RA 2506/4-1, DI 1537/5-1, DI 1537/7-1, DI 1537/8-1, DI 1537/9-1, AK 144/2-1, DI 1537/11-1, SCHE 1583/7-1, SPP1468-IMMUNOBONE, CRC1181]
- Bundesministerium fur Bildung und Forschung (METHARTHROS)
- Marie Curie project OSTEOIMMUNE
- European Union
- IMI
- Else Kroner-Fresenius-Stiftung [2014_A184]
- Wilhelm Sander Foundation [2013.056.1]
- Interdisciplinary Centre for Clinical Research, Erlangen [A64]
- ELAN Fonds of the Universitatsklinikum Erlangen [16-10-05-1]
- Medicine of the Ernst Jung Foundation
- SNF Sinergia [CRSII3_154490]
- UK MRC [UI015178805]
- Wellcome Trust [100963/Z/13/Z]
- US NIH [AI057459]
- MRC [G0800648, MC_U105178805] Funding Source: UKRI
- Medical Research Council [G0800648, MC_U105178805] Funding Source: researchfish
- Wellcome Trust [100963/Z/13/Z] Funding Source: researchfish
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Inflammatory diseases such as arthritis are chronic conditions that fail to resolve spontaneously. While the cytokine and cellular pathways triggering arthritis are well defined, those responsible for the resolution of inflammation are incompletely characterized. Here we identified interleukin (IL)-9-producing type 2 innate lymphoid cells (ILC2s) as the mediators of a molecular and cellular pathway that orchestrates the resolution of chronic inflammation. In mice, the absence of IL-9 impaired ILC2 proliferation and activation of regulatory T (T-reg) cells, and resulted in chronic arthritis with excessive cartilage destruction and bone loss. In contrast, treatment with IL-9 promoted ILC2-dependent T-reg activation and effectively induced resolution of inflammation and protection of bone. Patients with rheumatoid arthritis in remission exhibited high numbers of IL-9(+) ILC2s in joints and the circulation. Hence, fostering IL-9-mediated ILC2 activation may offer a novel therapeutic approach inducing resolution of inflammation rather than suppression of inflammatory responses.
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