1
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Nascimento M, Huot-Marchand S, Fanny M, Straube M, Le Bert M, Savigny F, Apetoh L, Van Snick J, Trovero F, Chamaillard M, Quesniaux VFJ, Ryffel B, Gosset P, Gombault A, Riteau N, Sokol H, Couillin I. NLRP6 controls pulmonary inflammation from cigarette smoke in a gut microbiota-dependent manner. Front Immunol 2023; 14:1224383. [PMID: 38146368 PMCID: PMC10749332 DOI: 10.3389/fimmu.2023.1224383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 11/20/2023] [Indexed: 12/27/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a major health issue primarily caused by cigarette smoke (CS) and characterized by breathlessness and repeated airway inflammation. NLRP6 is a cytosolic innate receptor controlling intestinal inflammation and orchestrating the colonic host-microbial interface. However, its roles in the lungs remain largely unexplored. Using CS exposure models, our data show that airway inflammation is strongly impaired in Nlrp6-deficient mice with drastically fewer recruited neutrophils, a key cell subset in inflammation and COPD. We found that NLRP6 expression in lung epithelial cells is important to control airway and lung tissue inflammation in an inflammasome-dependent manner. Since gut-derived metabolites regulate NLRP6 inflammasome activation in intestinal epithelial cells, we investigated the link between NLRP6, CS-driven lung inflammation, and gut microbiota composition. We report that acute CS exposure alters gut microbiota in both wild-type (WT) and Nlrp6-deficient mice and that antibiotic treatment decreases CS-induced lung inflammation. In addition, gut microbiota transfer from dysbiotic Nlrp6-deficient mice to WT mice decreased airway lung inflammation in WT mice, highlighting an NLRP6-dependent gut-to-lung axis controlling pulmonary inflammation.
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Affiliation(s)
- Mégane Nascimento
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Sarah Huot-Marchand
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Manoussa Fanny
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Marjolène Straube
- Sorbonne Université, Institut National de la Recherche Médicale (INSERM), Centre de Recherche Saint-Antoine (CRSA), Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Saint Antoine, Service de Gastroenterologie, Paris, France
| | - Marc Le Bert
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Florence Savigny
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | | | | | | | - Mathias Chamaillard
- Univ. Lille, Institut National de la Recherche Médicale (INSERM), U1003 - Laboratoire de physiologie cellulaire (PHYCEL) - Physiologie Cellulaire, Lille, France
| | - Valérie F. J. Quesniaux
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Bernhard Ryffel
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Philippe Gosset
- Institut PASTEUR INSERM U1019, Centre National de Recherche (CNRS) Unité Mixte de Recherche (UMR) 8204, Lille, France
| | - Aurélie Gombault
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Nicolas Riteau
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
| | - Harry Sokol
- Sorbonne Université, Institut National de la Recherche Médicale (INSERM), Centre de Recherche Saint-Antoine (CRSA), Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Saint Antoine, Service de Gastroenterologie, Paris, France
- Institut national de la recherche agronomique (INRA), UMR1319 Micalis, AgroParisTech, Jouy-en-Josas, France
- Paris Centre for Microbiome Medicine (PaCeMM) FHU, Paris, France
| | - Isabelle Couillin
- University of Orleans and Centre National de Recherche scientifique (CNRS), Experimental and Molecular Immunology and Neurogenetics (INEM)-UMR7355, Orleans, France
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2
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Carignon S, De Moura Rodrigues D, Gosset D, Culerier E, Huot-Marchand S, Savigny F, Kaya E, Quesniaux V, Gombault A, Couillin I, Ryffel B, Le Bert M, Riteau N. Lung inflammation and interstitial fibrosis by targeted alveolar epithelial type I cell death. Front Immunol 2023; 14:1261483. [PMID: 37841243 PMCID: PMC10568624 DOI: 10.3389/fimmu.2023.1261483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 09/11/2023] [Indexed: 10/17/2023] Open
Abstract
Introduction The pathogenesis of chronic lung diseases is multifaceted with a major role of recurrent micro-injuries of the epithelium. While several reports clearly indicated a prominent role for surfactant-producing alveolar epithelial type 2 (AT2) cells, the contribution of gas exchange-permissive alveolar epithelial type 1 (AT1) cells has not been addressed yet. Here, we investigated whether repeated injury of AT1 cells leads to inflammation and interstitial fibrosis. Methods We chose an inducible model of AT1 cell depletion following local diphtheria toxin (DT) administration using an iDTR flox/flox (idTRfl/fl) X Aquaporin 5CRE (Aqp5CRE) transgenic mouse strain. Results We investigated repeated doses and intervals of DT to induce cell death of AT1 cells causing inflammation and interstitial fibrosis. We found that repeated DT administrations at 1ng in iDTRfl/fl X Aqp5CRE mice cause AT1 cell death leading to inflammation, increased tissue repair markers and interstitial pulmonary fibrosis. Discussion Together, we demonstrate that depletion of AT1 cells using repeated injury represents a novel approach to investigate chronic lung inflammatory diseases and to identify new therapeutic targets.
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Affiliation(s)
- Sandra Carignon
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Dorian De Moura Rodrigues
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - David Gosset
- Center for Molecular Biophysics, CNRS Unité propre de recherche 4301, Orleans, France
| | - Elodie Culerier
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Sarah Huot-Marchand
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Florence Savigny
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Eric Kaya
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Valerie Quesniaux
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Aurélie Gombault
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Isabelle Couillin
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Bernhard Ryffel
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Marc Le Bert
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
| | - Nicolas Riteau
- University of Orleans and CNRS, Immunologie et Neurogénétique Expérimentales et Moléculaires -UMR7355, Orleans, France
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3
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De Moura Rodrigues D, Carignon S, Huot-Marchand S, Savigny F, Le Bert M, Gombault A, Couillin I, Riteau N. Deciphering STING-induced protection in pulmonary fibrosis. Rev Mal Respir 2023. [DOI: 10.1016/j.rmr.2022.11.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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4
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Huot-Marchand S, Nascimento M, Culerier E, Bourenane M, Savigny F, Panek C, Serdjebi C, Le Bert M, Quesniaux VFJ, Ryffel B, Broz P, Riteau N, Gombault A, Couillin I. Cigarette smoke-induced gasdermin D activation in bronchoalveolar macrophages and bronchial epithelial cells dependently on NLRP3. Front Immunol 2022; 13:918507. [PMID: 36045672 PMCID: PMC9421433 DOI: 10.3389/fimmu.2022.918507] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [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: 04/12/2022] [Accepted: 07/26/2022] [Indexed: 11/13/2022] Open
Abstract
Chronic pulmonary inflammation and chronic obstructive pulmonary disease (COPD) are major health issues largely due to air pollution and cigarette smoke (CS) exposure. The role of the innate receptor NLRP3 (nucleotide-binding domain and leucine-rich repeat containing protein 3) orchestrating inflammation through formation of an inflammasome complex in CS-induced inflammation or COPD remains controversial. Using acute and subchronic CS exposure models, we found that Nlrp3-deficient mice or wild-type mice treated with the NLRP3 inhibitor MCC950 presented an important reduction of inflammatory cells recruited into the bronchoalveolar space and of pulmonary inflammation with decreased chemokines and cytokines production, in particular IL-1β demonstrating the key role of NLRP3. Furthermore, mice deficient for Caspase-1/Caspase-11 presented also decreased inflammation parameters, suggesting a role for the NLRP3 inflammasome. Importantly we showed that acute CS-exposure promotes NLRP3-dependent cleavage of gasdermin D in macrophages present in the bronchoalveolar space and in bronchial airway epithelial cells. Finally, Gsdmd-deficiency reduced acute CS-induced lung and bronchoalveolar space inflammation and IL-1β secretion. Thus, we demonstrated in our model that NLRP3 and gasdermin D are key players in CS-induced pulmonary inflammation and IL-1β release potentially through gasdermin D forming-pore and/or pyroptoctic cell death.
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Affiliation(s)
| | | | - Elodie Culerier
- University of Orleans and CNRS, INEM-UMR7355, Orleans, France
| | | | | | - Corinne Panek
- University of Orleans and CNRS, INEM-UMR7355, Orleans, France
| | | | - Marc Le Bert
- University of Orleans and CNRS, INEM-UMR7355, Orleans, France
| | | | - Bernhard Ryffel
- University of Orleans and CNRS, INEM-UMR7355, Orleans, France
| | - Petr Broz
- Department of Biochemistry, University of Lausanne, Lausanne, Switzerland
| | - Nicolas Riteau
- University of Orleans and CNRS, INEM-UMR7355, Orleans, France
- *Correspondence: Isabelle Couillin, ; Nicolas Riteau,
| | | | - Isabelle Couillin
- University of Orleans and CNRS, INEM-UMR7355, Orleans, France
- *Correspondence: Isabelle Couillin, ; Nicolas Riteau,
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5
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Savigny F, Carignon S, Lacerda-Queiroz N, Huot-Marchand S, Kaya E, Ryffel B, Gombault A, Le Bert M, Couillin I, Riteau N. Protective role of the nucleic acid sensor STING in idiopathic pulmonary fibrosis. Rev Mal Respir 2022. [DOI: 10.1016/j.rmr.2022.02.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Huot-Marchand S, Gombault A, Nascimento M, Panek C, Savigny F, Schneider P, Le Bert M, Riteau N, Ryffel B, Quesniaux V, Couillin I. B-Cell Activating Factor secreted by neutrophils is a critical player in lung inflammation to cigarette smoke exposure. Rev Mal Respir 2021. [DOI: 10.1016/j.rmr.2021.02.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Mackowiak C, Marchiol T, Paljetak HC, Fauconnier L, Palomo J, Secher T, Panek C, Sedda D, Savigny F, Erard F, Bragonzi A, Huaux F, Stoeger T, Schiller HB, Sirard JC, Le Bert M, Couillin I, Quesniaux VFJ, Togbe D, Ryffel B. Chronic Pseudomonas aeruginosa Lung Infection Is IL-1R Independent, but Relies on MyD88 Signaling. Immunohorizons 2021; 5:273-283. [PMID: 33958388 DOI: 10.4049/immunohorizons.2000095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 03/01/2021] [Indexed: 11/19/2022] Open
Abstract
Cystic fibrosis is associated with chronic Pseudomonas aeruginosa colonization and inflammation. The role of MyD88, the shared adapter protein of the proinflammatory TLR and IL-1R families, in chronic P. aeruginosa biofilm lung infection is unknown. We report that chronic lung infection with the clinical P. aeruginosa RP73 strain is associated with uncontrolled lung infection in complete MyD88-deficient mice with epithelial damage, inflammation, and rapid death. Then, we investigated whether alveolar or myeloid cells contribute to heightened sensitivity to infection. Using cell-specific, MyD88-deficient mice, we uncover that the MyD88 pathway in myeloid or alveolar epithelial cells is dispensable, suggesting that other cell types may control the high sensitivity of MyD88-deficient mice. By contrast, IL-1R1-deficient mice control chronic P. aeruginosa RP73 infection and IL-1β Ab blockade did not reduce host resistance. Therefore, the IL-1R1/MyD88 pathway is not involved, but other IL-1R or TLR family members need to be investigated. Our data strongly suggest that IL-1 targeted neutralizing therapies used to treat inflammatory diseases in patients unlikely reduce host resistance to chronic P. aeruginosa infection.
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Affiliation(s)
- Claire Mackowiak
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | | | - Hana Cipcic Paljetak
- Center for Translational and Clinical Research, School of Medicine, University of Zagreb, Zagreb, Croatia
| | | | - Jennifer Palomo
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | | | - Corinne Panek
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | - Delphine Sedda
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | - Florence Savigny
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | - Francois Erard
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | | | | | - Tobias Stoeger
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Center Munich, German Research Center for Environmental Health, Neuherberg and Member of the German Center for Lung Research, Oberschleißheim, Germany
| | - Herbert B Schiller
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Center Munich, German Research Center for Environmental Health, Neuherberg and Member of the German Center for Lung Research, Oberschleißheim, Germany
| | - Jean-Claude Sirard
- Center for Infection and Immunity of Lille, Institute Pasteur and University of Lille, University Hospital Lille, CNRS, INSERM, U1019, UMR8204, Lille, France
| | - Marc Le Bert
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | - Isabelle Couillin
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | - Valerie F J Quesniaux
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | - Dieudonnée Togbe
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
| | - Bernhard Ryffel
- INEM, Experimental and Molecular Immunology and Neurogenetics, University of Orléans, CNRS, UMRP735, Orléans, France
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8
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Savigny F, Schricke C, Lacerda-Queiroz N, Meda M, Nascimento M, Huot-Marchand S, Da Gama Monteiro F, Ryffel B, Gombault A, Le Bert M, Couillin I, Riteau N. Protective Role of the Nucleic Acid Sensor STING in Pulmonary Fibrosis. Front Immunol 2021; 11:588799. [PMID: 33488589 PMCID: PMC7820752 DOI: 10.3389/fimmu.2020.588799] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 11/23/2020] [Indexed: 12/11/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is the most common and severe type of interstitial lung disease for which current treatments display limited efficacy. IPF is largely driven by host-derived danger signals released upon recurrent local tissue damage. Here we explored the roles of self-DNA and stimulator of interferon genes (STING), a protein belonging to an intracellular DNA sensing pathway that leads to type I and/or type III interferon (IFN) production upon activation. Using a mouse model of IPF, we report that STING deficiency leads to exacerbated pulmonary fibrosis with increased collagen deposition in the lungs and excessive remodeling factors expression. We further show that STING-mediated protection does not rely on type I IFN signaling nor on IL-17A or TGF-β modulation but is associated with dysregulated neutrophils. Together, our data support an unprecedented immunoregulatory function of STING in lung fibrosis.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Isabelle Couillin
- Experimental and Molecular Immunology and Neurogenetics Laboratory (INEM), CNRS Orleans (UMR7355) and University of Orleans, Orleans, France
| | - Nicolas Riteau
- Experimental and Molecular Immunology and Neurogenetics Laboratory (INEM), CNRS Orleans (UMR7355) and University of Orleans, Orleans, France
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9
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Nascimento M, Huot-Marchand S, Gombault A, Panek C, Bourinet M, Fanny M, Savigny F, Schneider P, Le Bert M, Ryffel B, Riteau N, Quesniaux VFJ, Couillin I. B-Cell Activating Factor Secreted by Neutrophils Is a Critical Player in Lung Inflammation to Cigarette Smoke Exposure. Front Immunol 2020; 11:1622. [PMID: 32849550 PMCID: PMC7405926 DOI: 10.3389/fimmu.2020.01622] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 06/17/2020] [Indexed: 12/18/2022] Open
Abstract
Cigarette smoke (CS) is the major cause of chronic lung injuries, such as chronic obstructive pulmonary disease (COPD). In patients with severe COPD, tertiary lymphoid follicles containing B lymphocytes and B cell-activating factor (BAFF) overexpression are associated with disease severity. In addition, BAFF promotes adaptive immunity in smokers and mice chronically exposed to CS. However, the role of BAFF in the early phase of innate immunity has never been investigated. We acutely exposed C57BL/6J mice to CS and show early BAFF expression in the bronchoalveolar space and lung tissue that correlates to airway neutrophil and macrophage influx. Immunostaining analysis revealed that neutrophils are the major source of BAFF. We confirmed in vitro that neutrophils secrete BAFF in response to cigarette smoke extract (CSE) stimulation. Antibody-mediated neutrophil depletion significantly dampens lung inflammation to CS exposure but only partially decreases BAFF expression in lung tissue and bronchoalveolar space suggesting additional sources of BAFF. Importantly, BAFF deficient mice displayed decreased airway neutrophil recruiting chemokines and neutrophil influx while the addition of exogenous BAFF significantly enhanced this CS-induced neutrophilic inflammation. This demonstrates that BAFF is a key proinflammatory cytokine and that innate immune cells in particular neutrophils, are an unconsidered source of BAFF in early stages of CS-induced innate immunity.
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Affiliation(s)
| | | | | | - Corinne Panek
- University of Orleans and CNRS, INEM-UMR7355, Orléans, France
| | - Manon Bourinet
- University of Orleans and CNRS, INEM-UMR7355, Orléans, France
| | - Manoussa Fanny
- University of Orleans and CNRS, INEM-UMR7355, Orléans, France
| | | | - Pascal Schneider
- Department of Biochemistry, University of Lausanne, Épalinges, Switzerland
| | - Marc Le Bert
- University of Orleans and CNRS, INEM-UMR7355, Orléans, France
| | - Bernhard Ryffel
- University of Orleans and CNRS, INEM-UMR7355, Orléans, France
| | - Nicolas Riteau
- University of Orleans and CNRS, INEM-UMR7355, Orléans, France
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10
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Baron L, Gombault A, Fanny M, Villeret B, Savigny F, Guillou N, Panek C, Le Bert M, Lagente V, Rassendren F, Riteau N, Couillin I. The NLRP3 inflammasome is activated by nanoparticles through ATP, ADP and adenosine. Cell Death Dis 2015; 6:e1629. [PMID: 25654762 PMCID: PMC4669808 DOI: 10.1038/cddis.2014.576] [Citation(s) in RCA: 145] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 11/28/2014] [Accepted: 12/03/2014] [Indexed: 12/11/2022]
Abstract
The NLR pyrin domain containing 3 (NLRP3) inflammasome is a major component of the innate immune system, but its mechanism of activation by a wide range of molecules remains largely unknown. Widely used nano-sized inorganic metal oxides such as silica dioxide (nano-SiO2) and titanium dioxide (nano-TiO2) activate the NLRP3 inflammasome in macrophages similarly to silica or asbestos micro-sized particles. By investigating towards the molecular mechanisms of inflammasome activation in response to nanoparticles, we show here that active adenosine triphosphate (ATP) release and subsequent ATP, adenosine diphosphate (ADP) and adenosine receptor signalling are required for inflammasome activation. Nano-SiO2 or nano-TiO2 caused a significant increase in P2Y1, P2Y2, A2A and/or A2B receptor expression, whereas the P2X7 receptor was downregulated. Interestingly, IL-1β secretion in response to nanoparticles is increased by enhanced ATP and ADP hydrolysis, whereas it is decreased by adenosine degradation or selective A2A or A2B receptor inhibition. Downstream of these receptors, our results show that nanoparticles activate the NLRP3 inflammasome via activation of PLC-InsP3 and/or inhibition of adenylate cyclase (ADCY)-cAMP pathways. Finally, a high dose of adenosine triggers inflammasome activation and IL-1β secretion through adenosine cellular uptake by nucleotide transporters and by its subsequent transformation in ATP by adenosine kinase. In summary, we show for the first time that extracellular adenosine activates the NLRP3 inflammasome by two ways: by interacting with adenosine receptors at nanomolar/micromolar concentrations and through cellular uptake by equilibrative nucleoside transporters at millimolar concentrations. These findings provide new molecular insights on the mechanisms of NLRP3 inflammasome activation and new therapeutic strategies to control inflammation.
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Affiliation(s)
- L Baron
- INEM, CNRS, UMR7355, University of Orleans, France
| | - A Gombault
- INEM, CNRS, UMR7355, University of Orleans, France
| | - M Fanny
- INEM, CNRS, UMR7355, University of Orleans, France
| | - B Villeret
- INEM, CNRS, UMR7355, University of Orleans, France
| | - F Savigny
- INEM, CNRS, UMR7355, University of Orleans, France
| | - N Guillou
- INEM, CNRS, UMR7355, University of Orleans, France
| | - C Panek
- INEM, CNRS, UMR7355, University of Orleans, France
| | - M Le Bert
- INEM, CNRS, UMR7355, University of Orleans, France
| | - V Lagente
- INSERM U991, University of Rennes, France
| | - F Rassendren
- IGF, CNRS, UMR 5203 and INSERM U661, University of Montpellier, France
| | - N Riteau
- INEM, CNRS, UMR7355, University of Orleans, France
| | - I Couillin
- INEM, CNRS, UMR7355, University of Orleans, France
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11
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Baron L, Savigny F, Gombault A, Villeret B, Guillou N, Le Bert M, Lagente V, Rassendren F, Couillin I. ATP, ADP and adenosine play a role in mature IL-1β secretion to Nlrp3 inflammasome activators. Rev Mal Respir 2014. [DOI: 10.1016/j.rmr.2014.04.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Gombault A, Villeret B, Savigny F, Baron L, Guillou N, Chamaillard M, Couillin I. Nlrp6 inflammasome in lung epithelium repair, inflammation and fibrosis after bleomycin-induced pulmonary injury. Rev Mal Respir 2014. [DOI: 10.1016/j.rmr.2014.04.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Abstract
In addition to the recombinase Rad51, vertebrates have five paralogs of Rad51, all members of the Rad51-dependent recombination pathway. These paralogs form two complexes (Rad51C/Xrcc3 and Rad51B/C/D/Xrcc2), which play roles in somatic recombination, DNA repair and chromosome stability. However, little is known of their possible involvement in meiosis, due to the inviability of the corresponding knockout mice. We have recently reported that the Arabidopsis homolog of one of these Rad51 paralogs (AtXrcc3) is involved in DNA repair and meiotic recombination and present here Arabidopsis lines carrying mutations in three other Rad51 paralogs (AtRad51B, AtRad51C and AtXrcc2). Disruption of any one of these paralogs confers hypersensitivity to the DNA cross-linking agent Mitomycin C, but not to gamma-irradiation. Moreover, the atrad51c-1 mutant is the only one of these to show meiotic defects similar to those of the atxrcc3 mutant, and thus only the Rad51C/Xrcc3 complex is required to achieve meiosis. These results support conservation of functions of the Rad51 paralogs between vertebrates and plants and differing requirements for the Rad51 paralogs in meiosis and DNA repair.
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Affiliation(s)
- Jean-Yves Bleuyard
- CNRS UMR6547, Université Blaise Pascal, 24, avenue des Landais, 63177 Aubière, France
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