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Nat Med. 2014 Jan;20(1):54-61. doi: 10.1038/nm.3423. Epub 2013 Dec 15.

Interleukin-17-producing innate lymphoid cells and the NLRP3 inflammasome facilitate obesity-associated airway hyperreactivity.

Author information

  • 1Division of Immunology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
  • 2Harvard School of Public Health, Boston, Massachusetts, USA.
  • 3Division of Infectious Diseases and Immunology, Department of Medicine, University of Massachusetts, Worcester, Massachusetts, USA.
  • 4Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo, Japan.
  • 5Division of Pulmonary and Critical Care, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
  • 6Respiratory Department, Connolly Hospital Blanchardstown, Dublin, Ireland.

Abstract

Obesity is associated with the development of asthma, which is often difficult to control. To understand the immunological pathways that lead to obesity-associated asthma, we fed mice a high-fat diet for 12 weeks, which resulted in obesity and the development of airway hyperreactivity (AHR), a cardinal feature of asthma. This AHR was independent of adaptive immunity, as it occurred in obese Rag1(-/-) mice, which lack B and T cells, and was dependent on interleukin-17A (IL-17A) and the NLRP3 inflammasome, as it did not develop in obese Il17a(-/-) or Nlrp3(-/-) mice. AHR was also associated with the expansion of CCR6(+) type 3 innate lymphoid cells (ILCs) producing IL-17A (ILC3 cells) in the lung, which could by themselves mediate AHR when adoptively transferred into Rag2(-/-); Il2rg(-/-) mice treated with recombinant IL-1β. Macrophage-derived IL-1β production was induced by HFD and expanded the number of lung ILC3 cells. Blockade of IL-1β with an IL-1 receptor antagonist abolished obesity-induced AHR and reduced the number of ILC3 cells. As we found ILC3-like cells in the bronchoalveolar lavage fluid of individuals with asthma, we suggest that obesity-associated asthma is facilitated by inflammation mediated by NLRP3, IL-1β and ILC3 cells.

PMID:
24336249
[PubMed - indexed for MEDLINE]
PMCID:
PMC3912313
Free PMC Article
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