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Palomo J, Marchiol T, Piotet J, Fauconnier L, Robinet M, Reverchon F, Le Bert M, Togbe D, Buijs-Offerman R, Stolarczyk M, Quesniaux VFJ, Scholte BJ, Ryffel B. Role of IL-1β in experimental cystic fibrosis upon P. aeruginosa infection. PLoS One 2014; 9:e114884. [PMID: 25500839 PMCID: PMC4264861 DOI: 10.1371/journal.pone.0114884] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 11/14/2014] [Indexed: 11/18/2022] Open
Abstract
Cystic fibrosis is associated with increased inflammatory responses to pathogen challenge. Here we revisited the role of IL-1β in lung pathology using the experimental F508del-CFTR murine model on C57BL/6 genetic background (Cftr(tm1eur) or d/d), on double deficient for d/d and type 1 interleukin-1 receptor (d/d X IL-1R1-/-), and antibody neutralization. At steady state, young adult d/d mice did not show any signs of spontaneous lung inflammation. However, IL-1R1 deficiency conferred partial protection to repeated P. aeruginosa endotoxins/LPS lung instillation in d/d mice, as 50% of d/d mice succumbed to inflammation, whereas all d/d x IL-1R1-/- double mutants survived with lower initial weight loss and less pulmonary collagen and mucus production, suggesting that the absence of IL-1R1 signaling is protective in d/d mice in LPS-induced lung damage. Using P. aeruginosa acute lung infection we found heightened neutrophil recruitment in d/d mice with higher epithelial damage, increased bacterial load in BALF, and augmented IL-1β and TNF-α in parenchyma as compared to WT mice. Thus, F508del-CFTR mice show enhanced IL-1β signaling in response to P. aeruginosa. IL-1β antibody neutralization had no effect on lung homeostasis in either d/d or WT mice, however P. aeruginosa induced lung inflammation and bacterial load were diminished by IL-1β antibody neutralization. In conclusion, enhanced susceptibility to P. aeruginosa in d/d mice correlates with an excessive inflammation and with increased IL-1β production and reduced bacterial clearance. Further, we show that neutralization of IL-1β in d/d mice through the double mutation d/d x IL-1R1-/- and in WT via antibody neutralization attenuates inflammation. This supports the notion that intervention in the IL-1R1/IL-1β pathway may be detrimental in CF patients.
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Affiliation(s)
- Jennifer Palomo
- CNRS, UMR7355, Orleans, France
- Experimental and Molecular Immunology and Neurogenetics, University of Orléans, Orléans, France
| | | | - Julie Piotet
- CNRS, UMR7355, Orleans, France
- Experimental and Molecular Immunology and Neurogenetics, University of Orléans, Orléans, France
| | | | | | - Flora Reverchon
- CNRS, UMR7355, Orleans, France
- Experimental and Molecular Immunology and Neurogenetics, University of Orléans, Orléans, France
| | | | | | | | | | - Valérie F. J. Quesniaux
- CNRS, UMR7355, Orleans, France
- Experimental and Molecular Immunology and Neurogenetics, University of Orléans, Orléans, France
| | - Bob J. Scholte
- Erasmus MC, Cell Biology department, Rotterdam, The Netherlands
- * E-mail: (BS); (BR)
| | - Bernhard Ryffel
- CNRS, UMR7355, Orleans, France
- Experimental and Molecular Immunology and Neurogenetics, University of Orléans, Orléans, France
- Institute of Infectious Disease and Molecular Medicine, IDM, Cape Town, South Africa
- * E-mail: (BS); (BR)
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