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Flannigan KL, Ngo VL, Geem D, Harusato A, Hirota SA, Parkos CA, Lukacs NW, Nusrat A, Gaboriau-Routhiau V, Cerf-Bensussan N, Gewirtz AT, Denning TL. IL-17A-mediated neutrophil recruitment limits expansion of segmented filamentous bacteria. Mucosal Immunol 2017; 10:673-684. [PMID: 27624780 PMCID: PMC5350071 DOI: 10.1038/mi.2016.80] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2016] [Accepted: 07/05/2016] [Indexed: 02/04/2023]
Abstract
Specific components of the intestinal microbiota are capable of influencing immune responses such that a mutualistic relationship is established. In mice, colonization with segmented filamentous bacteria (SFB) induces T-helper-17 (Th17) cell differentiation in the intestine, yet the effector functions of interleukin (IL)-17A in response to SFB remain incompletely understood. Here we report that colonization of mice with SFB-containing microbiota induced IL-17A- and CXCR2-dependent recruitment of neutrophils to the ileum. This response required adaptive immunity, as Rag-deficient mice colonized with SFB-containing microbiota failed to induce IL-17A, CXCL1 and CXCL2, and displayed defective neutrophil recruitment to the ileum. Interestingly, neutrophil depletion in wild-type mice resulted in significantly augmented Th17 responses and SFB expansion, which correlated with impaired expression of IL-22 and antimicrobial peptides. These data provide novel insight into a dynamic IL-17A-CXCR2-neutrophil axis during acute SFB colonization and demonstrate a central role for neutrophils in limiting SFB expansion.
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Affiliation(s)
- K L Flannigan
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia, USA
- Department of Physiology and Pharmacology, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - V L Ngo
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia, USA
| | - D Geem
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia, USA
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia, USA
| | - A Harusato
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia, USA
| | - S A Hirota
- Department of Physiology and Pharmacology, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - C A Parkos
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - N W Lukacs
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - A Nusrat
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - V Gaboriau-Routhiau
- INSERM, U1163, Laboratory of Intestinal Immunity, Université Paris Descartes-Sorbonne Paris Cité and Institut Imagine, Paris, France
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France
| | - N Cerf-Bensussan
- INSERM, U1163, Laboratory of Intestinal Immunity, Université Paris Descartes-Sorbonne Paris Cité and Institut Imagine, Paris, France
| | - A T Gewirtz
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia, USA
| | - T L Denning
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia, USA
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