Asthma is caused by T-helper cell 2 (Th2)-driven immune responses, but the immunological mechanisms that protect against asthma development are poorly understood. T-cell tolerance, induced by respiratory exposure to allergen, can inhibit the development of airway hyperreactivity (AHR), a cardinal feature of asthma, and we show here that regulatory T (TR) cells can mediate this protective effect. Mature pulmonary dendritic cells in the bronchial lymph nodes of mice exposed to respiratory allergen induced the development of TR cells, in a process that required T-cell costimulation via the inducible costimulator (ICOS)–ICOS-ligand pathway. The TR cells produced IL-10, and had potent inhibitory activity; when adoptively transferred into sensitized mice,* TR cells blocked the development of AHR. Both the development and the inhibitory function of regulatory cells were dependent on the presence of IL-10 and on ICOS–ICOS-ligand interactions. These studies demonstrate that TR cells and the ICOS–ICOS-ligand signaling pathway are critically involved in respiratory tolerance and in downregulating pulmonary inflammation in asthma.
*There was an error in the AOP version of this article. The sentence in the abstract that read The TR cells produced IL-10, and had potent inhibitory activity; when adoptively transferred into sensitized mouse TR cells, blocked the development of AHR was worded incorrectly. The following sentence is correct: The TR cells produced IL-10, and had potent inhibitory activity; when adoptively transferred into sensitized mice, TR cells blocked the development of AHR. This has been corrected in the HTML and the PDF. We regret this error.
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NOTE: There was an error in the AOP version of this article. The sentence in the abstract that read The TR cells produced IL-10, and had potent inhibitory activity; when adoptively transferred into sensitized mouse TR cells, blocked the development of AHR was worded incorrectly. The following sentence is correct: The TR cells produced IL-10, and had potent inhibitory activity; when adoptively transferred into sensitized mice, TR cells blocked the development of AHR. This has been corrected in the HTML and the PDF. We regret this error.
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This study was supported by the NIH Public Health Service (RO1HL62348, AI24571, AI26322, CA84500, AI39671, and AI38310), and a fellowship from the California Lung Association.
The authors declare no competing financial interests.
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Akbari, O., Freeman, G., Meyer, E. et al. Antigen-specific regulatory T cells develop via the ICOS–ICOS-ligand pathway and inhibit allergen-induced airway hyperreactivity. Nat Med 8, 1024–1032 (2002). https://doi.org/10.1038/nm745
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