Journal
JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY
Volume 139, Issue 4, Pages 1355-+Publisher
MOSBY-ELSEVIER
DOI: 10.1016/j.jaci.2016.08.022
Keywords
T-bet; innate lymphoid cells; IL-9; eosinophils
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [WG24390207, G26461486]
- LGS (Leading Graduate School at Chiba University) Program, MEXT, Japan
- Takeda Science Foundation, Japan
- Grants-in-Aid for Scientific Research [26461184, 17K09970, 26461486, 17K09995, 15H04828] Funding Source: KAKEN
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Background: Innate lymphoid cells (ILCs) are emerging subsets of immune cells that produce large amounts of cytokines upon cytokine and/or alarmin stimulation. Recent studies have shown that T-bet plays pivotal roles in the development of ILC3s and type 1 ILCs; however, the roles of T-bet in lung type 2 innate lymphoid cells (ILC2s) remain unknown. Objective: We sought to determine the role of T-bet in ILC2-mediated airway inflammation. Methods: The expression of T-bet in lung ILCs (defined as Thy1.2(+) Lin(-) cells) was examined. The roles of T-bet in the development of lung ILC2s and airway inflammation induced by IL-33 administration were examined by using T-bet-deficient (T-bet(-/-)) mice. Gene expression profiles of T-bet(-/-) lung ILCs were analyzed by RNA sequencing. Results: T-bet was expressed in lung ILC2s (defined as Thy1.2(+) Lin(-) cells expressing ST2 or CD25) and IFN-gamma enhanced its expression. Although the development of lung ILC2s at steady-state conditions was normal in T-bet(-/-) mice, IL-33-induced accumulation of lung ILC2s and eosinophilic airway inflammation were exacerbated in T-bet(-/-) mice. The exacerbated accumulation of ILC2s and eosinophilic airway inflammation by the absence of T-bet were evident even in a RAG2(-/-) background, suggesting that T-bet expressed in non-T/non-B population is involved in the suppression of IL-33-induced eosinophilic airway inflammation. Transcriptome analysis revealed that IL-9 expression in IL-33-stimulated lung ILCs was upregulated in T-bet(-/-) mice compared with that in wild-type mice. Importantly, neutralization of IL-9 markedly attenuated IL-33-induced accumulation of lung ILC2s and eosinophilic inflammation in T-bet(-/-) mice. Conclusions: T-bet suppresses IL-9 production from lung ILC2s and thereby inhibits IL-33-induced eosinophilic airway inflammation.
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