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Townsend EA, Guadarrama A, Shi L, Roti Roti E, Denlinger LC. P2X 7 signaling influences the production of pro-resolving and pro-inflammatory lipid mediators in alveolar macrophages derived from individuals with asthma. Am J Physiol Lung Cell Mol Physiol 2023; 325:L399-L410. [PMID: 37581221 PMCID: PMC10639011 DOI: 10.1152/ajplung.00070.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/16/2023] Open
Abstract
Few new therapeutics exist to target airway inflammation in mild-to-moderate asthma. Alveolar macrophages regulate airway inflammation by producing proresolving eicosanoids. We hypothesized that stimulation of the purinergic receptor P2X7 in macrophages from individuals with asthma produces eicosanoids associated with airway inflammation and resolution, and that these responses are predicted, in part, by P2X7 pore function. Study subjects were recruited in an Institutional Review Board (IRB)-approved study. Alveolar macrophages were recovered from bronchoalveolar lavage fluid following bronchoscopy. Purinergic receptor classification was performed using flow cytometry and fluorescent cell assay. Macrophages were stimulated in vitro and eicosanoids were measured via ELISA or enzyme immunoassay (EIA) in the presence and absence of P2X7-specific agonist [2'(3')-O-(4-Benzoylbenzoyl)adenosine-5'-triphosphate tri(triethylammonium) salt (Bz-ATP)] and antagonist (AZD9056). Functional P2X7 pore status was confirmed in a live cell assay using P2X7-specific agonists and antagonists. Alveolar macrophages produced increased quantities of the oxylipins lipoxin A4 (LXA4), resolvin D1 (RvD1), and 15(S)-hydroxyeicosatetraenoic acid (15(S)-HETE) following stimulation with Bz-ATP compared with vehicle controls, responses that were attenuated in the presence of the P2X7-selective antagonist, AZD9056. LXA4 and RvD1 production was greatest at 1 h, whereas 15(S)-HETE was maximally produced 24 h. Prostaglandin E-2 and resolvin E1 were minimally produced by P2X7 activation, indicating differential signaling pathways involved in eicosanoid production in alveolar macrophages derived from individuals with asthma. The early production of the proresolving eicosanoids, LXA4 and resolvin D1, is regulated by P2X7, whereas generation of the proinflammatory eicosanoid, 15(S)-HETE, is only partially regulated through P2X7 signaling and reaches maximal production after the peak in proresolving eicosanoids.NEW & NOTEWORTHY Alveolar macrophages obtained from individuals with asthma produce soluble lipid mediators in response to P2X7 purinergic receptor signaling. Proinflammatory mediators may contribute to asthma exacerbations but proresolving mediators may help with resolution of asthma loss of control. These specialized proresolving lipid mediators may serve as future potential therapeutics for asthma exacerbation resolution and recovery.
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Affiliation(s)
- Elizabeth A Townsend
- Department of Anesthesiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States
| | - Arturo Guadarrama
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States
| | - Lei Shi
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States
| | - Elon Roti Roti
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States
| | - Loren C Denlinger
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States
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Panek I, Liczek M, Gabryelska A, Rakoczy I, Kuna P, Panek M. Inflammasome signalling pathway in the regulation of inflammation - its involvement in the development and exacerbation of asthma and chronic obstructive pulmonary disease. Postepy Dermatol Alergol 2023; 40:487-495. [PMID: 37692274 PMCID: PMC10485761 DOI: 10.5114/ada.2022.118077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 09/13/2021] [Indexed: 09/12/2023] Open
Abstract
Inflammasomes are multiprotein oligomers, whose main function is the recruitment and activation of caspase-1, which cleaves the precursor forms of interleukin (IL)-1β and IL-18, generating biologically active cytokines. Activation of inflammasome is an essential component of the innate immune response, and according to recent reports it is involved in epithelial homeostasis and type 2 T helper cell (Th2) differentiation. In recent years, the contribution of inflammasome dependent signalling pathways to the development of inflammatory diseases became a topic of multiple research studies. Asthma and chronic obstructive pulmonary disease (COPD) are the most prevalent obstructive lung diseases. Recent studies have focused on inflammatory aspects of asthma and COPD development, demonstrating the key role of inflammasome-dependent processes. Factors responsible for activation of inflammasome complex are similar in both asthma and COPD and include bacteria, viruses, cigarette smoke, and particulate matter. Some recent studies have revealed that NLRP3 inflammasome plays a crucial role, particularly in the development of acute exacerbations of COPD (AECOPD). Activation of NLRP3 inflammasome has been linked with neutrophilic severe steroid-resistant asthma. Although most of the studies on inflammasomes in asthma and COPD focused on the NLRP3 inflammasome, there are scarce scientific reports linking other inflammasomes such as AIM2 and NLRP1 with obstructive lung diseases. In this mini review we focus on the role of molecular pathways associated with inflammasome in the most prevalent lung diseases such as asthma and COPD. Furthermore, we will try to answer the question of whether inhibition of inflammasome can occur as a modern therapy in these diseases.
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Affiliation(s)
- Iga Panek
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
| | - Maciej Liczek
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
| | - Agata Gabryelska
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
| | - Igor Rakoczy
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
| | - Piotr Kuna
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
| | - Michał Panek
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
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Sitarek P, Kowalczyk T, Śliwiński T, Hatziantoniou S, Soulintzi N, Pawliczak R, Wieczfinska J. Leonotis nepetifolia Transformed Root Extract Reduces Pro-Inflammatory Cytokines and Promotes Tissue Repair In Vitro. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:4706. [PMID: 36981614 PMCID: PMC10048264 DOI: 10.3390/ijerph20064706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 02/28/2023] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
Inflammation is closely related to asthma and its defining feature: airway remodeling. The aim of this study was to determine the effects of extracts of normal (NR) and transformed (TR) Leonotis nepetifolia roots on respiratory cells and against the gingival epithelium. Extracts from NR and TR roots were added to lung fibroblast, bronchial epithelial and gingival fibroblast cell lines, in the presence of HRV-16 infection, to determine their impact on inflammation. The expression of inflammatory cytokines (IL-6, IL-1β, GM-CSF and MCAF) as well as total thiol contents were assessed. The TR extract inhibited rhinovirus-induced IL-6 and IL-1β expression in all tested airway cells (p < 0.05). Additionally, the extract decreased GM-CSF expression in bronchial epithelial cells. The tested extracts had positive effects on total thiol content in all tested cell lines. The TR root extract demonstrated wound healing potential. While both tested extracts exhibited anti-inflammatory and antioxidative effects, they were stronger for the TR extract, possibly due to higher concentrations of beneficial metabolites such as phenols and flavonoids. Additionally, wound healing activity was demonstrated for the TR root extract. These results suggest that TR root extract may become a promising therapeutic agent in the future.
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Affiliation(s)
- Przemysław Sitarek
- Department of Biology and Pharmaceutical Botany, Medical University of Lodz, Muszynskiego 1, 90-151 Lodz, Poland
| | - Tomasz Kowalczyk
- Department of Molecular Biotechnology and Genetics, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland
| | - Tomasz Śliwiński
- Laboratory of Medical Genetics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska 141/143, 90-236 Lodz, Poland
| | - Sophia Hatziantoniou
- Laboratory of Pharmaceutical Technology, Department of Pharmacy, School of Health Sciences, University of Patras, 26504 Patras, Greece
| | - Nikolitsa Soulintzi
- Laboratory of Pharmaceutical Technology, Department of Pharmacy, School of Health Sciences, University of Patras, 26504 Patras, Greece
| | - Rafal Pawliczak
- Department of Immunopathology, Medical University of Lodz, Zeligowskiego 7/9, Bldg 2, Rm 177, 90-752 Lodz, Poland
| | - Joanna Wieczfinska
- Department of Immunopathology, Medical University of Lodz, Zeligowskiego 7/9, Bldg 2, Rm 177, 90-752 Lodz, Poland
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Abstract
Background Different species of human rhinovirus (HRV) can induce varied antiviral and inflammatory responses in human blood macrophages and lower airway epithelium. Although human nasal epithelial cells (HNECs) are a primary infection route of HRV, differences between major and minor groups of HRV in the upper airway epithelium have not been studied in detail. In this study, we investigated viral replications and immune responses of major and minor groups of HRV in the HNECs. Methods Viral replication, immune responses of IFN-β, IFN-λ, proinflammatory cytokines, and viral receptors, and mRNA expression of transcription factors of HRV16 (major group) and HRV1B (minor group) in the HNECs were assessed. Results Compared with HRV16, HRV1B replicated more actively without excessive cell death and produced higher IFN-β, IFN-λ1/3, CXCL10, IL-6, IL-8, and IL-18 levels. Furthermore, low-density lipoprotein receptor (LDLR), TLR3, MDA5, NF-κB, STAT1, and STAT2 mRNA levels increased in HRV1B-infected HNECs. Conclusion HRV1B induces a stronger antiviral and inflammatory response from cell entry to downstream signaling compared with HRV16. Supplementary Information The online version contains supplementary material available at 10.1186/s12985-021-01701-1.
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Rodriguez-Rodriguez N, Gogoi M, McKenzie AN. Group 2 Innate Lymphoid Cells: Team Players in Regulating Asthma. Annu Rev Immunol 2021; 39:167-198. [PMID: 33534604 PMCID: PMC7614118 DOI: 10.1146/annurev-immunol-110119-091711] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Type 2 immunity helps protect the host from infection, but it also plays key roles in tissue homeostasis, metabolism, and repair. Unfortunately, inappropriate type 2 immune reactions may lead to allergy and asthma. Group 2 innate lymphoid cells (ILC2s) in the lungs respond rapidly to local environmental cues, such as the release of epithelium-derived type 2 initiator cytokines/alarmins, producing type 2 effector cytokines such as IL-4, IL-5, and IL-13 in response to tissue damage and infection. ILC2s are associated with the severity of allergic asthma, and experimental models of lung inflammation have shown how they act as playmakers, receiving signals variously from stromal and immune cells as well as the nervous system and then distributing cytokine cues to elicit type 2 immune effector functions and potentiate CD4+ T helper cell activation, both of which characterize the pathology of allergic asthma. Recent breakthroughs identifying stromal- and neuronal-derived microenvironmental cues that regulate ILC2s, along with studies recognizing the potential plasticity of ILC2s, have improved our understanding of the immunoregulation of asthma and opened new avenues for drug discovery.
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Affiliation(s)
- Noe Rodriguez-Rodriguez
- Medical Research Council, Laboratory of Molecular Biology, Cambridge, Cambridgeshire, CB2 0QH. UK
| | - Mayuri Gogoi
- Medical Research Council, Laboratory of Molecular Biology, Cambridge, Cambridgeshire, CB2 0QH. UK
| | - Andrew N.J. McKenzie
- Medical Research Council, Laboratory of Molecular Biology, Cambridge, Cambridgeshire, CB2 0QH. UK,Corresponding author:
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NLRP3-Inflammasome Inhibition during Respiratory Virus Infection Abrogates Lung Immunopathology and Long-Term Airway Disease Development. Viruses 2021; 13:v13040692. [PMID: 33923693 PMCID: PMC8072578 DOI: 10.3390/v13040692] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 12/16/2022] Open
Abstract
Respiratory syncytial virus (RSV) infects most infants by two years of age. It can cause severe disease leading to an increased risk of developing asthma later in life. Previously, our group has shown that RSV infection in mice and infants promotes IL-1β production. Here, we characterized the role of NLRP3-Inflammasome activation during RSV infection in adult mice and neonates. We observed that the inhibition of NLRP3 activation using the small molecule inhibitor, MCC950, or in genetically modified NLRP3 knockout (Nlrp3−/−) mice during in vivo RSV infection led to decreased lung immunopathology along with a reduced expression of the mucus-associated genes and reduced production of innate cytokines (IL-1β, IL-33 and CCL2) linked to severe RSV disease while leading to significant increases in IFN-β. NLRP3-inflammasome inhibition or deletion diminished Th2 cytokines and inflammatory cell infiltration into the lungs. Furthermore, NLRP3 inhibition or deletion during early-life RSV infection led to reducing viral-exacerbated allergic response in a mouse model of RSV-induced allergy exacerbation. Here, we demonstrated the critical role of NLRP3-inflammasome activation in RSV immunopathology and the related long-term airway alteration. Moreover, these findings suggest the NLRP3-inflammasome as a potential therapeutic target to attenuate severe RSV disease and limit childhood asthma development.
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7
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Han M, Ishikawa T, Bermick JR, Rajput C, Lei J, Goldsmith AM, Jarman CR, Lee J, Bentley JK, Hershenson MB. IL-1β prevents ILC2 expansion, type 2 cytokine secretion, and mucus metaplasia in response to early-life rhinovirus infection in mice. Allergy 2020; 75:2005-2019. [PMID: 32086822 DOI: 10.1111/all.14241] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 01/15/2020] [Accepted: 01/18/2020] [Indexed: 01/06/2023]
Abstract
BACKGROUND Early-life wheezing-associated respiratory infection with human rhinovirus (RV) is associated with asthma development. RV infection of 6-day-old immature mice causes mucous metaplasia and airway hyperresponsiveness which is associated with the expansion of IL-13-producing type 2 innate lymphoid cells (ILC2s) and dependent on IL-25 and IL-33. We examined regulation of this asthma-like phenotype by IL-1β. METHODS Six-day-old wild-type or NRLP3-/- mice were inoculated with sham or RV-A1B. Selected mice were treated with IL-1 receptor antagonist (IL-1RA), anti-IL-1β, or recombinant IL-1β. RESULTS Rhinovirus infection induced Il25, Il33, Il4, Il5, Il13, muc5ac, and gob5 mRNA expression, ILC2 expansion, mucus metaplasia, and airway hyperresponsiveness. RV also induced lung mRNA and protein expression of pro-IL-1β and NLRP3 as well as cleavage of caspase-1 and pro-IL-1β, indicating inflammasome priming and activation. Lung macrophages were a major source of IL-1β. Inhibition of IL-1β signaling with IL-1RA, anti-IL-1β, or NLRP3 KO increased RV-induced type 2 cytokine immune responses, ILC2 number, and mucus metaplasia, while decreasing IL-17 mRNA expression. Treatment with IL-1β had the opposite effect, decreasing IL-25, IL-33, and mucous metaplasia while increasing IL-17 expression. IL-1β and IL-17 each suppressed Il25, Il33, and muc5ac mRNA expression in cultured airway epithelial cells. Finally, RV-infected 6-day-old mice showed reduced IL-1β mRNA and protein expression compared to mature mice. CONCLUSION Macrophage IL-1β limits type 2 inflammation and mucous metaplasia following RV infection by suppressing epithelial cell innate cytokine expression. Reduced IL-1β production in immature animals provides a mechanism permitting asthma development after early-life viral infection.
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Affiliation(s)
- Mingyuan Han
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Tomoko Ishikawa
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Jennifer R. Bermick
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Charu Rajput
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Jing Lei
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Adam M. Goldsmith
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Caitlin R. Jarman
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Julie Lee
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - J. Kelley Bentley
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Marc B. Hershenson
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
- Departments of Molecular and Integrative Physiology University of Michigan Medical School Ann Arbor Michigan
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8
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Montgomery ST, Frey DL, Mall MA, Stick SM, Kicic A. Rhinovirus Infection Is Associated With Airway Epithelial Cell Necrosis and Inflammation via Interleukin-1 in Young Children With Cystic Fibrosis. Front Immunol 2020; 11:596. [PMID: 32328066 PMCID: PMC7161373 DOI: 10.3389/fimmu.2020.00596] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 03/13/2020] [Indexed: 12/19/2022] Open
Abstract
Introduction: The responses of cystic fibrosis (CF) airway epithelial cells (AEC) to rhinovirus (RV) infection are likely to contribute to early pathobiology of lung disease with increased neutrophilic inflammation and lower apoptosis reported. Necrosis of AEC resulting in airway inflammation driven by IL-1 signaling is a characteristic finding in CF detectable in airways of young children. Being the most common early-life infection, RV-induced epithelial necrosis may contribute to early neutrophilic inflammation in CF via IL-1 signaling. As little is known about IL-1 and biology of CF lung disease, this study assessed cellular and pro-inflammatory responses of CF and non-CF AEC following RV infection, with the hypothesis that RV infection drives epithelial necrosis and IL-1 driven inflammation. Methods:Primary AEC obtained from children with (n = 6) and without CF (n = 6) were infected with RV (MOI 3) for 24 h and viable, necrotic and apoptotic events quantified via flow cytometry using a seven-step gating strategy (% total events). IL-1α, IL-1β, IL-1Ra, IL-8, CXCL10, CCL5, IFN-β, IL-28A, IL-28B, and IL-29 were also measured in cell culture supernatants (pg/mL). Results:RV infection reduced viable events in non-CF AEC (p < 0.05), increased necrotic events in non-CF and CF AEC (p < 0.05) and increased apoptotic events in non-CF AEC (p < 0.05). Infection induced IL-1α and IL-1β production in both phenotypes (p < 0.05) but only correlated with necrosis (IL-1α: r = 0.80; IL-1β: r = 0.77; p < 0.0001) in CF AEC. RV infection also increased IL-1Ra in non-CF and CF AEC (p < 0.05), although significantly more in non-CF AEC (p < 0.05). Finally, infection stimulated IL-8 production in non-CF and CF AEC (p < 0.05) and correlated with IL-1α (r = 0.63 & r = 0.74 respectively; p < 0.0001). Conclusions:This study found RV infection drives necrotic cell death in CF AEC. Furthermore, RV induced IL-1 strongly correlated with necrotic cell death in these cells. As IL-1R signaling drives airway neutrophilia and mucin production, these observations suggest RV infection early in life may exacerbate inflammation and mucin accumulation driving early CF lung disease. Since IL-1R can be targeted therapeutically with IL-1Ra, these data suggest a new anti-inflammatory therapeutic approach targeting downstream effects of IL-1R signaling to mitigate viral-induced, muco-inflammatory triggers of early lung disease.
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Affiliation(s)
- Samuel T Montgomery
- Faculty of Health and Medical Sciences, School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia
| | - Dario L Frey
- Department of Translational Pulmonology, Translational Lung Research Center Heidelberg, University of Heidelberg, Heidelberg, Germany.,German Center for Lung Research, Heidelberg, Germany
| | - Marcus A Mall
- German Center for Lung Research, Heidelberg, Germany.,Department of Pediatric Pulmonology, Immunology and Critical Care Medicine, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Berlin Institute of Health, Berlin, Germany
| | - Stephen M Stick
- Faculty of Health and Medical Sciences, School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia.,Telethon Kids Institute, The University of Western Australia, Crawley, WA, Australia.,Department of Respiratory and Sleep Medicine, Perth Children's Hospital, Nedlands, WA, Australia.,Centre for Cell Therapy and Regenerative Medicine, School of Medicine and Pharmacology, The University of Western Australia, Nedlands, WA, Australia
| | - Anthony Kicic
- Faculty of Health and Medical Sciences, School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia.,Telethon Kids Institute, The University of Western Australia, Crawley, WA, Australia.,Department of Respiratory and Sleep Medicine, Perth Children's Hospital, Nedlands, WA, Australia.,Centre for Cell Therapy and Regenerative Medicine, School of Medicine and Pharmacology, The University of Western Australia, Nedlands, WA, Australia.,School of Public Health, Curtin University, Bentley, WA, Australia.,Telethon Kids Institute, The University of Western Australia, Crawley, WA, Australia.,St John of God Hospital, Subiaco, WA, Australia
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Scambler T, Jarosz-Griffiths HH, Lara-Reyna S, Pathak S, Wong C, Holbrook J, Martinon F, Savic S, Peckham D, McDermott MF. ENaC-mediated sodium influx exacerbates NLRP3-dependent inflammation in cystic fibrosis. eLife 2019; 8:49248. [PMID: 31532390 PMCID: PMC6764826 DOI: 10.7554/elife.49248] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 09/17/2019] [Indexed: 12/13/2022] Open
Abstract
Cystic Fibrosis (CF) is a monogenic disease caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene, resulting in defective CFTR-mediated chloride and bicarbonate transport, with dysregulation of epithelial sodium channels (ENaC). These changes alter fluid and electrolyte homeostasis and result in an exaggerated proinflammatory response driven, in part, by infection. We tested the hypothesis that NLRP3 inflammasome activation and ENaC upregulation drives exaggerated innate-immune responses in this multisystem disease. We identify an enhanced proinflammatory signature, as evidenced by increased levels of IL-18, IL-1β, caspase-1 activity and ASC-speck release in monocytes, epithelia and serum with CF-associated mutations; these differences were reversed by pretreatment with NLRP3 inflammasome inhibitors and notably, inhibition of amiloride-sensitive sodium (Na+) channels. Overexpression of β-ENaC, in the absence of CFTR dysfunction, increased NLRP3-mediated inflammation, indicating that dysregulated, ENaC-dependent signalling may drive exaggerated inflammatory responses in CF. These data support a role for sodium in modulating NLRP3 inflammasome activation.
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Affiliation(s)
- Thomas Scambler
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom
| | - Heledd H Jarosz-Griffiths
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom.,Leeds Institute of Medical Research, University of Leeds, Leeds, United Kingdom.,Leeds Cystic Fibrosis Trust Strategic Research Centre, University of Leeds, Leeds, United Kingdom
| | - Samuel Lara-Reyna
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom.,Leeds Institute of Medical Research, University of Leeds, Leeds, United Kingdom
| | - Shelly Pathak
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom
| | - Chi Wong
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom.,Leeds Institute of Medical Research, University of Leeds, Leeds, United Kingdom.,Leeds Cystic Fibrosis Trust Strategic Research Centre, University of Leeds, Leeds, United Kingdom
| | - Jonathan Holbrook
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom.,Leeds Institute of Medical Research, University of Leeds, Leeds, United Kingdom.,Leeds Cystic Fibrosis Trust Strategic Research Centre, University of Leeds, Leeds, United Kingdom
| | - Fabio Martinon
- Leeds Cystic Fibrosis Trust Strategic Research Centre, University of Leeds, Leeds, United Kingdom.,Department of Biochemistry, University of Lausanne, Lausanne, Switzerland
| | - Sinisa Savic
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom.,Leeds Cystic Fibrosis Trust Strategic Research Centre, University of Leeds, Leeds, United Kingdom.,Department of Clinical Immunology and Allergy, St James's University Hospital, Leeds, United Kingdom
| | - Daniel Peckham
- Leeds Institute of Medical Research, University of Leeds, Leeds, United Kingdom.,Leeds Cystic Fibrosis Trust Strategic Research Centre, University of Leeds, Leeds, United Kingdom.,Adult Cystic Fibrosis Unit, St James' University Hospital, Leeds, United Kingdom
| | - Michael F McDermott
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom.,Leeds Cystic Fibrosis Trust Strategic Research Centre, University of Leeds, Leeds, United Kingdom
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Han M, Bentley JK, Rajput C, Lei J, Ishikawa T, Jarman CR, Lee J, Goldsmith AM, Jackson WT, Hoenerhoff MJ, Lewis TC, Hershenson MB. Inflammasome activation is required for human rhinovirus-induced airway inflammation in naive and allergen-sensitized mice. Mucosal Immunol 2019; 12:958-968. [PMID: 31089187 PMCID: PMC6668626 DOI: 10.1038/s41385-019-0172-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 04/09/2019] [Accepted: 04/29/2019] [Indexed: 02/04/2023]
Abstract
Activation of the inflammasome is a key function of the innate immune response that regulates inflammation in response to microbial substances. Inflammasome activation by human rhinovirus (RV), a major cause of asthma exacerbations, has not been well studied. We examined whether RV induces inflammasome activation in vivo, molecular mechanisms underlying RV-stimulated inflammasome priming and activation, and the contribution of inflammasome activation to RV-induced airway inflammation and exacerbation. RV infection triggered lung mRNA and protein expression of pro-IL-1β and NLRP3, indicative of inflammasome priming, as well as cleavage of caspase-1 and pro-IL-1β, completing inflammasome activation. Immunofluorescence staining showed IL-1β in lung macrophages. Depletion with clodronate liposomes and adoptive transfer experiments showed macrophages to be required and sufficient for RV-induced inflammasome activation. TLR2 was required for RV-induced inflammasome priming in vivo. UV irradiation blocked inflammasome activation and RV genome was sufficient for inflammasome activation in primed cells. Naive and house dust mite-treated NLRP3-/- and IL-1β-/- mice, as well as IL-1 receptor antagonist-treated mice, showed attenuated airway inflammation and responsiveness following RV infection. We conclude that RV-induced inflammasome activation is required for maximal airway inflammation and hyperresponsiveness in naive and allergic mice. The inflammasome represents a molecular target for RV-induced asthma exacerbations.
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Affiliation(s)
- Mingyuan Han
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - J. Kelley Bentley
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Charu Rajput
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Jing Lei
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Tomoko Ishikawa
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Caitlin R. Jarman
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Julie Lee
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Adam M. Goldsmith
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - William T. Jackson
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Mark J. Hoenerhoff
- Department of Unit for Laboratory Animal Medicine, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Toby C. Lewis
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Marc B. Hershenson
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109;,Department of Molecular and Integrative Physiology,University of Michigan Medical School, Ann Arbor, MI 48109
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Dong Y, Glaser K, Schlegel N, Claus H, Speer CP. An underestimated pathogen: Staphylococcus epidermidis induces pro-inflammatory responses in human alveolar epithelial cells. Cytokine 2019; 123:154761. [PMID: 31226437 DOI: 10.1016/j.cyto.2019.154761] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 06/06/2019] [Accepted: 06/11/2019] [Indexed: 12/27/2022]
Abstract
OBJECTIVES Conventionally regarded as a harmless skin commensal, Staphylococcus epidermidis accounts for the majority of neonatal late-onset sepsis and is shown to be associated with neonatal inflammatory morbidities, especially bronchopulmonary dysplasia. This study addressed the pro-inflammatory capacity of different S. epidermidis strains on human alveolar epithelial cells. METHODS A549 cell monolayers were stimulated by live bacteria of S. epidermidis RP62A strain (biofilm-positive) and ATCC 12228 strain (biofilm-negative) at a multiplicity of infection ratio of 10 for 24 h. LPS (100 ng/ml) and Pam3CSK4 (1 µg/ml) were used for comparisons. Cell viability was measured by MTT method. The mRNA and protein expression of inflammatory mediators and toll-like receptor (TLR)-2 were assessed using RT-PCR, immunoassays and immunofluorescence. RESULTS Both S. epidermidis strains induced expression of tumor necrosis factor (TNF)-α, IL-1β, interleukin (IL)-6, IL-8, monocyte chemoattractant protein (MCP)-1, interferon γ-induced protein 10 (IP-10) and intercellular adhesion molecule (ICAM)-1, but not IL-10. The stimulatory effect of RP62A exceeded that of LPS (p < 0.05). RP62A strain showed a trend towards higher induction of pro-inflammatory mediators than ATCC 12228 strain. The co-stimulation with RP62A strain decreased cell viability compared to control and TLR agonists (p < 0.05). RP62A but not ATCC 12228 stimulated mRNA and protein expression of TLR2. CONCLUSIONS S. epidermidis drives pro-inflammatory responses in lung epithelial cells in vitro. The pro-inflammatory capacity of S. epidermidis may differ between strains. Biofilm-positive S. epidermidis strain seems to induce more potent pulmonary pro-inflammation than biofilm-negative S. epidermidis strain.
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Affiliation(s)
- Ying Dong
- University Children's Hospital, University of Wuerzburg, Wuerzburg, Germany.
| | - Kirsten Glaser
- University Children's Hospital, University of Wuerzburg, Wuerzburg, Germany
| | - Nicolas Schlegel
- Department of Surgery I, University of Wuerzburg, Wuerzburg, Germany
| | - Heike Claus
- Institute for Hygiene and Microbiology, University of Wuerzburg, Wuerzburg, Germany
| | - Christian P Speer
- University Children's Hospital, University of Wuerzburg, Wuerzburg, Germany
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12
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Mahmutovic Persson I, Menzel M, Ramu S, Cerps S, Akbarshahi H, Uller L. IL-1β mediates lung neutrophilia and IL-33 expression in a mouse model of viral-induced asthma exacerbation. Respir Res 2018; 19:16. [PMID: 29361942 PMCID: PMC5781288 DOI: 10.1186/s12931-018-0725-z] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 01/17/2018] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Viral-induced asthma exacerbations, which exhibit both Th1-type neutrophilia and Th2-type inflammation, associate with secretion of Interleukin (IL)-1β. IL-1β induces neutrophilic inflammation. It may also increase Th2-type cytokine expression. We hypothesised that IL-1β is causally involved in both Th1 and Th2 features of asthma exacerbations. This hypothesis is tested in our mouse model of viral stimulus-induced asthma exacerbation. METHOD Wild-type (WT) and IL-1β deficient (IL-1β-/-) mice received house dust mite (HDM) or saline intranasally during three weeks followed by intranasal dsRNA (PolyI:C molecule known for its rhinovirus infection mimic) for three consecutive days to provoke exacerbation. Bronchoalveolar lavage fluid was analysed for inflammatory cells and total protein. Lung tissues were stained for neutrophilic inflammation and IL-33. Tissue homogenates were analysed for mRNA expression of Muc5ac, CXCL1/KC, TNF-α, CCL5, IL-25, TSLP, IL-33, IL-1β, CCL11 and CCL2 using RT-qPCR. RESULTS Expression of IL-1β, neutrophil chemoattractants, CXCL1 and CCL5, the Th2-upstream cytokine IL-33, and Muc5ac were induced at exacerbation in WT mice and were significantly inhibited in IL-1β-/- mice at exacerbation. Effects of HDM alone were not reduced in IL-1β-deficient mice. CONCLUSION Without being involved in the baseline HDM-induced allergic asthma, IL-1β signalling was required to induce neutrophil chemotactic factors, IL-33, and Muc5ac expression at viral stimulus-induced exacerbation. We suggest that IL-1β has a role both in neutrophilic and Th2 inflammation at viral-induced asthma exacerbations.
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Affiliation(s)
- Irma Mahmutovic Persson
- Department Experimental Medical Science Unit of Respiratory Immunopharmacology, BMC D12, Lund University, 221 84, Lund, Sweden
| | - Mandy Menzel
- Department Experimental Medical Science Unit of Respiratory Immunopharmacology, BMC D12, Lund University, 221 84, Lund, Sweden
| | - Sangeetha Ramu
- Department Experimental Medical Science Unit of Respiratory Immunopharmacology, BMC D12, Lund University, 221 84, Lund, Sweden
| | - Samuel Cerps
- Department Experimental Medical Science Unit of Respiratory Immunopharmacology, BMC D12, Lund University, 221 84, Lund, Sweden
| | - Hamid Akbarshahi
- Department Experimental Medical Science Unit of Respiratory Immunopharmacology, BMC D12, Lund University, 221 84, Lund, Sweden
| | - Lena Uller
- Department Experimental Medical Science Unit of Respiratory Immunopharmacology, BMC D12, Lund University, 221 84, Lund, Sweden.
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13
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Induction of innate host responses characterized by production of interleukin (IL)-1β and recruitment of macrophages to the respiratory tract of chickens following infection with infectious bronchitis virus (IBV). Vet Microbiol 2018; 215:1-10. [PMID: 29426399 DOI: 10.1016/j.vetmic.2018.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Revised: 01/01/2018] [Accepted: 01/02/2018] [Indexed: 12/16/2022]
Abstract
Infectious bronchitis virus (IBV) infection is a major cause of economic losses to the poultry industry. Due to limitations in current control measures, alternative approaches, based on thorough understanding of the host responses are required. As one of the key component of the avian immune system, the innate immune system has a crucial role in limiting virus replication at the initial stage of the infection. As parts of the innate host response, macrophages and cytokines, such as interleukin (IL)-1β, are critical components as shown in other host-virus infection models. Since information on the importance of macrophages and IL-1β in IBV infection in chickens is limited, our objective was to determine the association of IL-1β, originating from avian macrophages and IBV infection in the trachea and lung. Following experimental IBV infection in 6 days old chickens, we found increased production of IL-1β and increased recruitment of macrophages in the respiratory tract. Towards the end of the study (5 and 7 days following the IBV infection), the recruited macrophages appear to be a significant source IL-1β. However, only the recruitment of macrophages in the lung correlated with IBV genome loads in this tissue. In conclusion, the present study demonstrates that recruitment of macrophages and the production of IL-1β originating from macrophages, as well as other sources, occur following IBV infection in the respiratory tract suggesting potential roles of these mediators in the host responses to IBV infection. However, further studies are warranted to elucidate whether macrophages and IL-1β are the causes of reduced IBV genome loads in the respiratory tract and also to investigate whether immune mediators that were not measured in the current study were involved in reducing IBV genome load in the respiratory tract towards the end of the study.
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14
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Huipao N, Borwornpinyo S, Wiboon-ut S, Campbell CR, Lee IH, Hiranyachattada S, Sukasem C, Thitithanyanont A, Pholpramool C, Cook DI, Dinudom A. P2Y6 receptors are involved in mediating the effect of inactivated avian influenza virus H5N1 on IL-6 & CXCL8 mRNA expression in respiratory epithelium. PLoS One 2017; 12:e0176974. [PMID: 28494003 PMCID: PMC5426635 DOI: 10.1371/journal.pone.0176974] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 04/20/2017] [Indexed: 11/18/2022] Open
Abstract
One of the key pathophysiologies of H5N1 infection is excessive proinflammatory cytokine response (cytokine storm) characterized by increases in IFN-β, TNF-α, IL-6, CXCL10, CCL4, CCL2 and CCL5 in the respiratory tract. H5N1-induced cytokine release can occur via an infection-independent mechanism, however, detail of the cellular signaling involved is poorly understood. To elucidate this mechanism, the effect of inactivated (β-propiolactone-treated) H5N1 on the cytokine and chemokine mRNA expression in 16HBE14o- human respiratory epithelial cells was investigated. We found that the inactivated-H5N1 increased mRNA for IL-6 and CXCL8 but not TNF-α, CCL5 or CXCL10. This effect of the inactivated-H5N1 was inhibited by sialic acid receptor inhibitor (α-2,3 sialidase), adenosine diphosphatase (apyrase), P2Y receptor (P2YR) inhibitor (suramin), P2Y6R antagonist (MRS2578), phospholipase C inhibitor (U73122), protein kinase C inhibitors (BIM and Gö6976) and cell-permeant Ca2+ chelator (BAPTA-AM). Inhibitors of MAPK signaling, including of ERK1/2 (PD98059), p38 MAPK (SB203580) and JNK (SP600125) significantly suppressed the inactivated-H5N1-induced mRNA expression of CXCL8. On the other hand, the inactivated-H5N1-induced mRNA expression of IL-6 was inhibited by SB203580, but not PD98059 or SP600125, whereas SN-50, an inhibitor of NF-κB, inhibited the effect of virus on mRNA expression of both of IL-6 and CXCL8. Taken together, our data suggest that, without infection, inactivated-H5N1 induces mRNA expression of IL-6 and CXCL8 by a mechanism, or mechanisms, requiring interaction between viral hemagglutinin and α-2,3 sialic acid receptors at the cell membrane of host cells, and involves activation of P2Y6 purinergic receptors.
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Affiliation(s)
- Nawiya Huipao
- Department of Physiology, Faculty of Science, Prince of Songkla University, Songkhla, Thailand
| | - Suparerk Borwornpinyo
- Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Suwimon Wiboon-ut
- Department of Microbiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Craig R. Campbell
- Discipline of Physiology, The Bosch Institute, School of Medical Sciences, The University of Sydney, Sydney, Australia
| | - Il-Ha Lee
- Discipline of Physiology, The Bosch Institute, School of Medical Sciences, The University of Sydney, Sydney, Australia
| | | | - Chonlaphat Sukasem
- Division of Pharmacogenomics and Personalized Medicine, Department of Pathology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | | | - Chumpol Pholpramool
- Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - David I. Cook
- Discipline of Physiology, The Bosch Institute, School of Medical Sciences, The University of Sydney, Sydney, Australia
| | - Anuwat Dinudom
- Discipline of Physiology, The Bosch Institute, School of Medical Sciences, The University of Sydney, Sydney, Australia
- * E-mail:
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15
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Hill AR, Donaldson JE, Blume C, Smithers N, Tezera L, Tariq K, Dennison P, Rupani H, Edwards MJ, Howarth PH, Grainge C, Davies DE, Swindle EJ. IL-1α mediates cellular cross-talk in the airway epithelial mesenchymal trophic unit. Tissue Barriers 2016; 4:e1206378. [PMID: 27583193 PMCID: PMC4993579 DOI: 10.1080/21688370.2016.1206378] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 06/17/2016] [Accepted: 06/21/2016] [Indexed: 01/05/2023] Open
Abstract
The bronchial epithelium and underlying fibroblasts form an epithelial mesenchymal trophic unit (EMTU) which controls the airway microenvironment. We hypothesized that cell-cell communication within the EMTU propagates and amplifies the innate immune response to respiratory viral infections. EMTU co-culture models incorporating polarized (16HBE14o-) or differentiated primary human bronchial epithelial cells (HBECs) and fibroblasts were challenged with double-stranded RNA (dsRNA) or rhinovirus. In the polarized EMTU model, dsRNA affected ionic but not macromolecular permeability or cell viability. Compared with epithelial monocultures, dsRNA-stimulated pro-inflammatory mediator release was synergistically enhanced in the basolateral compartment of the EMTU model, with the exception of IL-1α which was unaffected by the presence of fibroblasts. Blockade of IL-1 signaling with IL-1 receptor antagonist (IL-1Ra) completely abrogated dsRNA-induced basolateral release of mediators except CXCL10. Fibroblasts were the main responders to epithelial-derived IL-1 since exogenous IL-1α induced pro-inflammatory mediator release from fibroblast but not epithelial monocultures. Our findings were confirmed in a differentiated EMTU model where rhinovirus infection of primary HBECs and fibroblasts resulted in synergistic induction of basolateral IL-6 that was significantly abrogated by IL-1Ra. This study provides the first direct evidence of integrated IL-1 signaling within the EMTU to propagate inflammatory responses to viral infection.
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Affiliation(s)
- Alison R Hill
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton , Southampton, UK
| | - Jessica E Donaldson
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton , Southampton, UK
| | - Cornelia Blume
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton , Southampton, UK
| | - Natalie Smithers
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton , Southampton, UK
| | - Liku Tezera
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton , Southampton, UK
| | - Kamran Tariq
- NIHR Southampton Respiratory Biomedical Research Unit, University Hospital Southampton , Southampton, UK
| | - Patrick Dennison
- NIHR Southampton Respiratory Biomedical Research Unit, University Hospital Southampton , Southampton, UK
| | - Hitasha Rupani
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, UK; NIHR Southampton Respiratory Biomedical Research Unit, University Hospital Southampton, Southampton, UK
| | | | - Peter H Howarth
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, UK; NIHR Southampton Respiratory Biomedical Research Unit, University Hospital Southampton, Southampton, UK
| | - Christopher Grainge
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton , Southampton, UK
| | - Donna E Davies
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, UK; NIHR Southampton Respiratory Biomedical Research Unit, University Hospital Southampton, Southampton, UK; Institute for Life Sciences, Highfield Campus, University of Southampton, Southampton, UK
| | - Emily J Swindle
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, UK; NIHR Southampton Respiratory Biomedical Research Unit, University Hospital Southampton, Southampton, UK; Institute for Life Sciences, Highfield Campus, University of Southampton, Southampton, UK
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16
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Alves MP, Schögler A, Ebener S, Vielle NJ, Casaulta C, Jung A, Moeller A, Geiser T, Regamey N. Comparison of innate immune responses towards rhinovirus infection of primary nasal and bronchial epithelial cells. Respirology 2015; 21:304-12. [DOI: 10.1111/resp.12692] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 07/14/2015] [Accepted: 08/26/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Marco P. Alves
- Department of Clinical ResearchUniversity Hospital of Bern Bern Switzerland
- Division of Pediatric Respiratory MedicineUniversity Children's Hospital Bern Switzerland
| | - Aline Schögler
- Department of Clinical ResearchUniversity Hospital of Bern Bern Switzerland
- Graduate School for Cellular and Biomedical SciencesUniversity Hospital of Bern Bern Switzerland
- Division of Pediatric Respiratory MedicineUniversity Children's Hospital Bern Switzerland
| | - Simone Ebener
- Department of Clinical ResearchUniversity Hospital of Bern Bern Switzerland
- Graduate School for Cellular and Biomedical SciencesUniversity Hospital of Bern Bern Switzerland
- Division of Pediatric Respiratory MedicineUniversity Children's Hospital Bern Switzerland
| | - Nathalie J. Vielle
- Department of Clinical ResearchUniversity Hospital of Bern Bern Switzerland
- Division of Pediatric Respiratory MedicineUniversity Children's Hospital Bern Switzerland
| | - Carmen Casaulta
- Division of Pediatric Respiratory MedicineUniversity Children's Hospital Bern Switzerland
| | - Andreas Jung
- Division of Respiratory MedicineUniversity Children's Hospital Zürich Switzerland
| | - Alexander Moeller
- Division of Respiratory MedicineUniversity Children's Hospital Zürich Switzerland
| | - Thomas Geiser
- Department of Clinical ResearchUniversity Hospital of Bern Bern Switzerland
- Division of Respiratory MedicineUniversity Hospital of Bern Bern Switzerland
| | - Nicolas Regamey
- Department of Clinical ResearchUniversity Hospital of Bern Bern Switzerland
- Children's Hospital Lucerne Lucerne Switzerland
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17
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Jackson DJ, Glanville N, Trujillo-Torralbo MB, Shamji BWH, del-Rosario J, Mallia P, Edwards MJ, Walton RP, Edwards MR, Johnston SL. Interleukin-18 Is Associated With Protection Against Rhinovirus-Induced Colds and Asthma Exacerbations. Clin Infect Dis 2015; 60:1528-31. [DOI: 10.1093/cid/civ062] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 01/13/2015] [Indexed: 11/13/2022] Open
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18
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Lee WM, Chen Y, Wang W, Mosser A. Growth of human rhinovirus in H1-HeLa cell suspension culture and purification of virions. Methods Mol Biol 2015; 1221:49-61. [PMID: 25261306 DOI: 10.1007/978-1-4939-1571-2_5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
HeLa cell culture is the most widely used system for in vitro studies of the basic biology of human rhinovirus (HRV). It is also useful for making sufficient quantities of virus for experiments that require highly concentrated and purified virus. This chapter describes the protocols for producing a large amount of HeLa cells in suspension culture, using these cells to grow a large quantity of virus of HeLa-adapted HRV-A and -B serotypes, and making highly concentrated virus stock and highly purified virions. These purified HRV virions are free of cellular components and suitable for experiments that are sensitive to cellular contaminations.
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Affiliation(s)
- Wai-Ming Lee
- Biological Mimetics Inc., 124 Byte Drive, Frederick, MD, 21702, USA
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19
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Manthei DM, Schwantes EA, Mathur SK, Guadarrama AG, Kelly EA, Gern JE, Jarjour NN, Denlinger LC. Nasal lavage VEGF and TNF-α levels during a natural cold predict asthma exacerbations. Clin Exp Allergy 2014; 44:1484-93. [PMID: 25109477 PMCID: PMC4247169 DOI: 10.1111/cea.12387] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 06/09/2014] [Accepted: 06/20/2014] [Indexed: 01/09/2023]
Abstract
BACKGROUND Asthma exacerbations contribute to significant morbidity, mortality and healthcare utilization. Furthermore, viral infections are associated with asthma exacerbations by mechanisms that are not fully understood. OBJECTIVE The aim of this analysis was to determine whether cytokine patterns in patients with colds could identify risks for subsequent asthma exacerbations. METHODS We analysed cytokine levels in nasal lavage fluid (NLF) in 59 subjects (46 with asthma) with acute upper respiratory symptoms and after symptomatic resolution. Analyte choice was based on potential relevance to asthma exacerbations: antiviral (IFN-α, IFN-β, IFN-γ, IFN-λ1, IP-10, TRAIL), cell recruiting (G-CSF, IL-1β, IL-8, MCP-1, MCP-3, TNF-α), polarizing (CXCL13, IL-10, IL-13, IL-17, TSLP), and injury remodelling (fibronectin, IL-33, MMP-9, VEGF). RESULTS The overall cytokine response induced during viral infections was not different between asthmatic and non-asthmatic individuals for a wide array of cytokines. However, mean levels of VEGF, TNF-α and IL-1β were 1.7-, 5.1- and 4.7-fold higher in samples from asthma subjects who exacerbated in the first 3 weeks of the cold compared with those who did not exacerbate (P = 0.006, 0.01, 0.048, respectively). Using receiver operating characteristic curve-defined thresholds, high VEGF and TNF-α levels predicted a shorter time-to-exacerbation after NLF sampling (25% exacerbation rate: 3 vs. 45 days, and 3 vs. 26 days; P = 0.03, 0.04, respectively). CONCLUSION AND CLINICAL RELEVANCE Although they produce similar cytokine responses to viral infection as non-asthmatics, asthmatics with higher levels of VEGF and TNF-α in NLF obtained during acute cold phases predicted subsequent asthma exacerbations in this cohort of patients with mild-to-moderate disease. In the future, stratifying the risk of an asthma exacerbation by cytokine profile may aid the targeting of personalized treatment and intervention strategies.
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Affiliation(s)
- D M Manthei
- University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
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20
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Hussain S, Sangtian S, Anderson SM, Snyder RJ, Marshburn JD, Rice AB, Bonner JC, Garantziotis S. Inflammasome activation in airway epithelial cells after multi-walled carbon nanotube exposure mediates a profibrotic response in lung fibroblasts. Part Fibre Toxicol 2014; 11:28. [PMID: 24915862 PMCID: PMC4067690 DOI: 10.1186/1743-8977-11-28] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 06/03/2014] [Indexed: 11/10/2022] Open
Abstract
Background In vivo studies have demonstrated the ability of multi-walled carbon nanotubes (MWCNT) to induce airway remodeling, a key feature of chronic respiratory diseases like asthma and chronic obstructive pulmonary disease. However, the mechanism leading to remodeling is poorly understood. Particularly, there is limited insight about the role of airway epithelial injury in these changes. Objectives We investigated the mechanism of MWCNT-induced primary human bronchial epithelial (HBE) cell injury and its contribution in inducing a profibrotic response. Methods Primary HBE cells were exposed to thoroughly characterized MWCNTs (1.5-24 μg/mL equivalent to 0.37-6.0 μg/cm2) and MRC-5 human lung fibroblasts were exposed to 1:4 diluted conditioned medium from these cells. Flow cytometry, ELISA, immunostainings/immunoblots and PCR analyses were employed to study cellular mechanisms. Results MWCNT induced NLRP3 inflammasome dependent pyroptosis in HBE cells in a time- and dose-dependent manner. Cell death and cytokine production were significantly reduced by antioxidants, siRNA to NLRP3, a caspase-1 inhibitor (z-WEHD-FMK) or a cathepsin B inhibitor (CA-074Me). Conditioned medium from MWCNT-treated HBE cells induced significant increase in mRNA expression of pro-fibrotic markers (TIMP-1, Tenascin-C, Procollagen 1, and Osteopontin) in human lung fibroblasts, without a concomitant change in expression of TGF-beta. Induction of pro-fibrotic markers was significantly reduced when IL-1β, IL-18 and IL-8 neutralizing antibodies were added to the conditioned medium or when conditioned medium from NLRP3 siRNA transfected HBE cells was used. Conclusions Taken together these results demonstrate induction of a NLRP3 inflammasome dependent but TGF-beta independent pro-fibrotic response after MWCNT exposure.
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Affiliation(s)
- Salik Hussain
- Clinical Research Unit, National Institute of Environmental Health Sciences (NIEHS)/National Institute of Health (NIH), Research Triangle Park, Durham, NC, USA.
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21
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Eugenin EA. Role of connexin/pannexin containing channels in infectious diseases. FEBS Lett 2014; 588:1389-95. [PMID: 24486013 DOI: 10.1016/j.febslet.2014.01.030] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 01/20/2014] [Accepted: 01/21/2014] [Indexed: 12/12/2022]
Abstract
In recent years it has become evident that gap junctions and hemichannels, in concert with extracellular ATP and purinergic receptors, play key roles in several physiological processes and pathological conditions. However, only recently has their importance in infectious diseases been explored, likely because early reports indicated that connexin containing channels were completely inactivated under inflammatory conditions, and therefore no further research was performed. However, recent evidence indicates that several infectious agents take advantage of these communication systems to enhance inflammation and apoptosis, as well as to participate in the infectious cycle of several pathogens. In the current review, we will discuss the role of these channels/receptors in the pathogenesis of several infectious diseases and the possibilities of generating novel therapeutic approaches to reduce or prevent these diseases.
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Affiliation(s)
- Eliseo A Eugenin
- Public Health Research Institute (PHRI), Rutgers New Jersey Medical School, Rutgers The State University of New Jersey, Newark, NJ, USA; Department of Microbiology and Molecular Genetics, Rutgers New Jersey Medical School, Rutgers The State University of New Jersey, Newark, NJ, USA.
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22
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Robinson KM, Choi SM, McHugh KJ, Mandalapu S, Enelow RI, Kolls JK, Alcorn JF. Influenza A exacerbates Staphylococcus aureus pneumonia by attenuating IL-1β production in mice. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2013; 191:5153-9. [PMID: 24089191 PMCID: PMC3827735 DOI: 10.4049/jimmunol.1301237] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Pneumonia is a leading cause of death worldwide. Staphylococcal aureus can be a cause of severe pneumonia alone or a common pathogen in secondary pneumonia following influenza. Recently, we reported that preceding influenza attenuated the Type 17 pathway, increasing the lung's susceptibility to secondary infection. IL-1β is known to regulate host defense, including playing a role in Th17 polarization. We examined whether IL-1β signaling is required for S. aureus host defense and whether influenza infection impacted S. aureus-induced IL-1β production and subsequent Type 17 pathway activation. Mice were challenged with S. aureus (USA 300), with or without preceding Influenza A/PR/8/34 H1N1 infection. IL-1R1(-/-) mice had significantly higher S. aureus burden, increased mortality, and decreased Type 17 pathway activation following S. aureus challenge. Coinfected mice had significantly decreased IL-1β production versus S. aureus infection alone at early time points following bacterial challenge. Preceding influenza did not attenuate S. aureus-induced inflammasome activation, but there was early suppression of NF-κB activation, suggesting an inhibition of NF-κB-dependent transcription of pro-IL-1β. Furthermore, overexpression of IL-1β in influenza and S. aureus-coinfected mice rescued the induction of IL-17 and IL-22 by S. aureus and improved bacterial clearance. Finally, exogenous IL-1β did not significantly rescue S. aureus host defense during coinfection in IL-17RA(-/-) mice or in mice in which IL-17 and IL-22 activity were blocked. These data reveal a novel mechanism by which Influenza A inhibits S. aureus-induced IL-1β production, resulting in attenuation of Type 17 immunity and increased susceptibility to bacterial infection.
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Affiliation(s)
- Keven M. Robinson
- Department of Pediatrics, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, PA
- Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA
| | - Sun Mi Choi
- Richard K. Mellon Foundation Institute, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, PA
| | - Kevin J. McHugh
- Department of Pediatrics, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, PA
| | | | | | - Jay K. Kolls
- Richard K. Mellon Foundation Institute, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, PA
| | - John F. Alcorn
- Department of Pediatrics, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, PA
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23
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Gavala ML, Liu YP, Lenertz LY, Zeng L, Blanchette JB, Guadarrama AG, Denlinger LC, Bertics PJ, Smith JA. Nucleotide receptor P2RX7 stimulation enhances LPS-induced interferon-β production in murine macrophages. J Leukoc Biol 2013; 94:759-68. [PMID: 23911869 PMCID: PMC3774844 DOI: 10.1189/jlb.0712351] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 05/22/2013] [Accepted: 06/27/2013] [Indexed: 12/22/2022] Open
Abstract
Stimulation of P2RX(7) with extracellular ATP potentiates numerous LPS-induced proinflammatory events, including cytokine induction in macrophages, but the molecular mechanisms underlying this process are not well defined. Although P2RX(7) ligation has been proposed to activate several transcription factors, many of the LPS-induced mediators affected by P2RX(7) activation are not induced by P2RX(7) agonists alone, suggesting a complementary role for P2RX(7) in transcriptional regulation. Type I IFN production, whose expression is tightly controlled by multiple transcription factors that form an enhanceosome, is critical for resistance against LPS-containing bacteria. The effect of purinergic receptor signaling on LPS-dependent type I IFN is unknown and would be of great relevance to a diverse array of inflammatory conditions. The present study demonstrates that stimulation of macrophages with P2RX(7) agonists substantially enhances LPS-induced IFN-β expression, and this enhancement is ablated in macrophages that do not express functional P2RX(7) or when the MAPK MEK1/2 pathways are inhibited. Potentiation of LPS-induced IFN-β expression following P2RX(7) stimulation is likely transcriptionally regulated, as this enhancement is observed at the IFN-β promoter level. Furthermore, P2RX(7) stimulation is able to increase the phosphorylation and subsequent IFN-β promoter occupancy of IRF-3, a transcription factor that is critical for IFN-β transcription by TLR agonists. This newly discovered role for P2RX(7) in IFN regulation may have implications in antimicrobial defense, which has been linked to P2RX(7) activation in other studies.
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Affiliation(s)
- M L Gavala
- 2.University of Wisconsin School of Medicine and Public Health, 600 Highland Ave., CSC H4/472, Madison, WI 53792-9988, USA.
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Mathur SK, Fichtinger PS, Kelly JT, Lee WM, Gern JE, Jarjour NN. Interaction between allergy and innate immunity: model for eosinophil regulation of epithelial cell interferon expression. Ann Allergy Asthma Immunol 2013; 111:25-31. [PMID: 23806456 PMCID: PMC3708694 DOI: 10.1016/j.anai.2013.05.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 05/14/2013] [Accepted: 05/16/2013] [Indexed: 01/21/2023]
Abstract
BACKGROUND Eosinophils in asthmatic airways are associated with risk of exacerbations. The most common cause of asthma exacerbations is viral respiratory infections, particularly human rhinovirus (HRV). OBJECTIVE To determine the mechanism by which eosinophils may influence virus-induced responses. METHODS We used an in vitro coculture model of primary human eosinophils and the BEAS-2B epithelial cell line either stimulated with HRV1A infection or polyinosinic-polycytidylic acid (poly[I:C]). The messenger RNA (mRNA) expression of interferon (IFN) β1 and IFN-λ1 was assessed by quantitative reverse-transcriptase polymerase chain reaction and the protein level of IFN- λ1 by enzyme-linked immunosorbent assay. RESULTS Both poly(I:C) and HRV1A infection induced BEAS-2B expression of IFN-β1 and IFN-λ1 mRNA. Coculture of eosinophils resulted in suppression of poly(I:C)-stimulated IFN-β1 and IFN-λ1 mRNA expression (2.5-fold and 3.6-fold less, respectively). Separation of cells did not block eosinophil regulatory activity. Coculture of eosinophils with HRV1A-infected BEAS-2B cells also suppressed IFN-β1 and IFN-λ1 mRNA (5.7-fold and 5.0-fold less, respectively) and reduced IFN-λ1 protein secretion (1.6-fold decrease). This corresponded to a 34% increase in the quantity of HRV1A virus RNA on coculture with eosinophils. Recombinant transforming growth factor β suppressed IFN-λ1 from HRV1A-infected BEAS-2B cells. Coculture of eosinophils and BEAS-2B cells induced transforming growth factor β secretion, which may mediate suppression of HRV-induced interferon expression. CONCLUSION Eosinophils suppressed HRV-induced expression of interferons from epithelial cells, resulting in increased quantity of HRV. This represents one mechanism for interaction between allergic inflammation and innate immunity.
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Affiliation(s)
- Sameer K Mathur
- Division of Allergy, Pulmonary and Critical Care, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53792, USA.
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Abstract
Evidence has increasingly shown that the lungs are a major site of immune regulation. A robust and highly regulated immune response in the lung protects the host from pathogen infection, whereas an inefficient or deleterious response can lead to various pulmonary diseases. Many cell types, such as epithelial cells, dendritic cells, macrophages, neutrophils, eosinophils, and B and T lymphocytes, contribute to lung immunity. This review focuses on the recent advances in understanding how T lymphocytes mediate pulmonary host defenses against bacterial, viral, and fungal pathogens.
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Affiliation(s)
- Kong Chen
- Richard King Mellon Foundation Institute for Pediatric Research, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, Pennsylvania 15201, USA
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26
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Abstract
Understanding the underlying mechanisms that cause and exacerbate allergic asthmatic disease is of great clinical interest. Clinical studies have revealed that allergies and viral respiratory illnesses are strongly linked to the inception and exacerbation of asthma, and suggest the possibility that there are interactive inflammatory mechanisms. Recent work has revealed a number of mechanisms of virus and allergen cross-talk that may play a role in the pathophysiology of allergic asthma, including (1) deficiency in virus-induced interferon responses, (2) defective epithelial barrier function, (3) increased release of epithelium-derived cytokines (e.g., thymic stromal lymphopoietin (TSLP), interleukin (IL)-25, IL-33), (4) dysregulation of lymphocytes [e.g., innate lymphoid cells (ILCs), regulatory T cells (Tregs)], and (5) altered activation of purinergic receptors. One or more of these processes may provide targets for new therapeutics to treat allergic asthma and prevent disease exacerbation.
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Affiliation(s)
- Monica L. Gavala
- Department of Biomolecular Chemistry, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA
| | - Hiba Bashir
- Department of Pediatrics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA
| | - James E. Gern
- Department of Pediatrics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA
- Department of Medicine, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA
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The role of interleukin-1 and interleukin-18 in pro-inflammatory and anti-viral responses to rhinovirus in primary bronchial epithelial cells. PLoS One 2013; 8:e63365. [PMID: 23723976 PMCID: PMC3665753 DOI: 10.1371/journal.pone.0063365] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Accepted: 04/01/2013] [Indexed: 12/20/2022] Open
Abstract
Human Rhinovirus (HRV) is associated with acute exacerbations of chronic respiratory disease. In healthy individuals, innate viral recognition pathways trigger release of molecules with direct anti-viral activities and pro-inflammatory mediators which recruit immune cells to support viral clearance. Interleukin-1alpha (IL-1α), interleukin-1beta (IL-1β) and interleukin-18 (IL-18) have critical roles in the establishment of neutrophilic inflammation, which is commonly seen in airways viral infection and thought to be detrimental in respiratory disease. We therefore investigated the roles of these molecules in HRV infection of primary human epithelial cells. We found that all three cytokines were released from infected epithelia. Release of these cytokines was not dependent on cell death, and only IL-1β and IL-18 release was dependent on caspase-1 catalytic activity. Blockade of IL-1 but not IL-18 signaling inhibited up-regulation of pro-inflammatory mediators and neutrophil chemoattractants but had no effect on virus induced production of interferons and interferon-inducible genes, measured at both mRNA and protein level. Similar level of virus mRNA was detected with and without IL-1RI blockade. Hence IL-1 signaling, potentially involving both IL-1β and IL-1α, downstream of viral recognition plays a key role in induction of pro-inflammatory signals and potentially in recruitment and activation of immune cells in response to viral infection instigated by the epithelial cells, whilst not participating in direct anti-viral responses.
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Peeters PM, Perkins TN, Wouters EFM, Mossman BT, Reynaert NL. Silica induces NLRP3 inflammasome activation in human lung epithelial cells. Part Fibre Toxicol 2013; 10:3. [PMID: 23402370 PMCID: PMC3607900 DOI: 10.1186/1743-8977-10-3] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Accepted: 01/29/2013] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND In myeloid cells the inflammasome plays a crucial role in innate immune defenses against pathogen- and danger-associated patterns such as crystalline silica. Respirable mineral particles impinge upon the lung epithelium causing irreversible damage, sustained inflammation and silicosis. In this study we investigated lung epithelial cells as a target for silica-induced inflammasome activation. METHODS A human bronchial epithelial cell line (BEAS-2B) and primary normal human bronchial epithelial cells (NHBE) were exposed to toxic but nonlethal doses of crystalline silica over time to perform functional characterization of NLRP3, caspase-1, IL-1β, bFGF and HMGB1. Quantitative RT-PCR, caspase-1 enzyme activity assay, Western blot techniques, cytokine-specific ELISA and fibroblast (MRC-5 cells) proliferation assays were performed. RESULTS We were able to show transcriptional and translational upregulation of the components of the NLRP3 intracellular platform, as well as activation of caspase-1. NLRP3 activation led to maturation of pro-IL-1β to secreted IL-1β, and a significant increase in the unconventional release of the alarmins bFGF and HMGB1. Moreover, release of bFGF and HMGB1 was shown to be dependent on particle uptake. Small interfering RNA experiments using siNLRP3 revealed the pivotal role of the inflammasome in diminished release of pro-inflammatory cytokines, danger molecules and growth factors, and fibroblast proliferation. CONCLUSION Our novel data indicate the presence and functional activation of the NLRP3 inflammasome by crystalline silica in human lung epithelial cells, which prolongs an inflammatory signal and affects fibroblast proliferation, mediating a cadre of lung diseases.
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Affiliation(s)
- Paul M Peeters
- Department of Respiratory Medicine, Maastricht University Medical Centre+ (MUMC+), Maastricht University, Maastricht, The Netherlands
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Foster JG, Carter E, Kilty I, MacKenzie AB, Ward SG. Mitochondrial superoxide generation enhances P2X7R-mediated loss of cell surface CD62L on naive human CD4+ T lymphocytes. THE JOURNAL OF IMMUNOLOGY 2013; 190:1551-9. [PMID: 23319734 DOI: 10.4049/jimmunol.1201510] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Migration of naive CD4(+) T lymphocytes into lymphoid tissue is essential for their activation and subsequent roles in adaptive immunity. The adhesion molecule L-selectin (CD62L), critical for this process, is highly expressed on naive CD4(+) T lymphocytes and is downregulated upon T lymphocyte activation. We demonstrate protein expression of P2X7R on naive CD4(+) T lymphocytes and show functional channel activity in whole-cell patch clamp recordings. CD62L downregulation occurs rapidly in response to extracellular ATP, a process that is blocked by selective antagonists of P2X7R. This loss of surface CD62L expression was not associated with externalization of phosphatidylserine. While investigating the mechanisms for this process, we revealed that pharmacological modulation of mitochondrial complex I or III, but not inhibition of NADPH oxidase, enhanced P2X7R-dependent CD62L downregulation by increasing ATP potency. Enhanced superoxide generation in the mitochondria of rotenone- and antimycin A-treated cells was observed and may contribute to the enhanced sensitivity of P2X7R to ATP. P2X7R-dependent exposure of phosphatidylserine was also revealed by preincubation with mitochondrial uncouplers prior to ATP treatment. This may present a novel mechanism whereby P2X7R-dependent phosphatidylserine exposure occurs only when cells have enhanced mitochondrial reactive oxygen species generation. The clearance of apoptotic cells may therefore be enhanced by this mechanism which requires functional P2X7R expression.
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Affiliation(s)
- John G Foster
- Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, United Kingdom
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Gillette DD, Shah PA, Cremer T, Gavrilin MA, Besecker BY, Sarkar A, Knoell DL, Cormet-Boyaka E, Wewers MD, Butchar JP, Tridandapani S. Analysis of human bronchial epithelial cell proinflammatory response to Burkholderia cenocepacia infection: inability to secrete il-1β. J Biol Chem 2012; 288:3691-5. [PMID: 23269671 DOI: 10.1074/jbc.c112.430298] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Burkholderia cenocepacia, the causative agent of cepacia syndrome, primarily affects cystic fibrosis patients, often leading to death. In the lung, epithelial cells serve as the initial barrier to airway infections, yet their responses to B. cenocepacia have not been fully investigated. Here, we examined the molecular responses of human airway epithelial cells to B. cenocepacia infection. Infection led to early signaling events such as activation of Erk, Akt, and NF-κB. Further, TNFα, IL-6, IL-8, and IL-1β were all significantly induced upon infection, but no IL-1β was detected in the supernatants. Because caspase-1 is required for IL-1β processing and release, we examined its expression in airway epithelial cells. Interestingly, little to no caspase-1 was detectable in airway epithelial cells. Transfection of caspase-1 into airway epithelial cells restored their ability to secrete IL-1β following B. cenocepacia infection, suggesting that a deficiency in caspase-1 is responsible, at least in part, for the attenuated IL-1β secretion.
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Affiliation(s)
- Devyn D Gillette
- Integrated Biomedical Graduate Program, The Ohio State University, Columbus, Ohio 43210, USA
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31
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Denlinger LC, Manthei DM, Seibold MA, Ahn K, Bleecker E, Boushey HA, Calhoun WJ, Castro M, Chinchili VM, Fahy JV, Hawkins GA, Icitovic N, Israel E, Jarjour NN, King T, Kraft M, Lazarus SC, Lehman E, Martin RJ, Meyers DA, Peters SP, Sheerar D, Shi L, Sutherland ER, Szefler SJ, Wechsler ME, Sorkness CA, Lemanske RF. P2X7-regulated protection from exacerbations and loss of control is independent of asthma maintenance therapy. Am J Respir Crit Care Med 2012; 187:28-33. [PMID: 23144325 DOI: 10.1164/rccm.201204-0750oc] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE The function of the P2X(7) nucleotide receptor protects against exacerbation in people with mild-intermittent asthma during viral illnesses, but the impact of disease severity and maintenance therapy has not been studied. OBJECTIVES To evaluate the association between P2X(7), asthma exacerbations, and incomplete symptom control in a more diverse population. METHODS A matched P2RX7 genetic case-control was performed with samples from Asthma Clinical Research Network trial participants enrolled before July 2006, and P2X(7) pore activity was determined in whole blood samples as an ancillary study to two trials completed subsequently. MEASUREMENTS AND MAIN RESULTS A total of 187 exacerbations were studied in 742 subjects, and the change in asthma symptom burden was studied in an additional 110 subjects during a trial of inhaled corticosteroids (ICS) dose optimization. African American carriers of the minor G allele of the rs2230911 loss-of-function single nucleotide polymorphism were more likely to have a history of prednisone use in the previous 12 months, with adjustment for ICS and long-acting β(2)-agonists use (odds ratio, 2.7; 95% confidence interval, 1.2-6.2; P = 0.018). Despite medium-dose ICS, attenuated pore function predicted earlier exacerbations in incompletely controlled patients with moderate asthma (hazard ratio, 3.2; confidence interval, 1.1-9.3; P = 0.033). After establishing control with low-dose ICS in patients with mild asthma, those with attenuated pore function had more asthma symptoms, rescue albuterol use, and FEV(1) reversal (P < 0.001, 0.03, and 0.03, respectively) during the ICS adjustment phase. CONCLUSIONS P2X(7) pore function protects against exacerbations of asthma and loss of control, independent of baseline severity and the maintenance therapy.
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Affiliation(s)
- Loren C Denlinger
- University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.
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Hirota JA, Knight DA. Human airway epithelial cell innate immunity: relevance to asthma. Curr Opin Immunol 2012; 24:740-6. [PMID: 23089231 DOI: 10.1016/j.coi.2012.08.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 08/22/2012] [Indexed: 01/07/2023]
Abstract
The innate immunity function of the human airway epithelium is responsible for orchestrating defence against inhaled viruses, bacteria, fungi, allergens, pollution, and other environmental insults. Epithelial cells present a mechanically tight, pseudostratified, multi-cell barrier that secretes mucus, surfactants, and anti-microbial peptides to manage minor insults. Secondary to the mechanical impedances, cell surface and cytoplasmic pattern recognition receptors await detection of more aggressive insults. The differentiation state of the airway epithelium contributes to innate immunity by compartmentalizing receptors and mediator production. Activation of innate immune receptors triggers production of interferons, cytokines, and chemokines, which influence adaptive immune responses. Mounting evidence suggests that these responses are aberrant in asthma and may contribute to disease progression and exacerbations. In this review, we discuss the recent evidence supporting these statements, focusing primarily on data generated from using human samples.
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Affiliation(s)
- Jeremy A Hirota
- UBC James Hogg Research Centre Heart + Lung Institute, St Pauls Hospital, Vancouver, BC, V6Z 1Y6, Canada
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