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Reuschl AK, Edwards MR, Parker R, Connell DW, Hoang L, Halliday A, Jarvis H, Siddiqui N, Wright C, Bremang S, Newton SM, Beverley P, Shattock RJ, Kon OM, Lalvani A. Innate activation of human primary epithelial cells broadens the host response to Mycobacterium tuberculosis in the airways. PLoS Pathog 2017; 13:e1006577. [PMID: 28863187 PMCID: PMC5605092 DOI: 10.1371/journal.ppat.1006577] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 09/19/2017] [Accepted: 08/11/2017] [Indexed: 01/17/2023] Open
Abstract
Early events in the human airways determining whether exposure to Mycobacterium tuberculosis (Mtb) results in acquisition of infection are poorly understood. Epithelial cells are the dominant cell type in the lungs, but little is known about their role in tuberculosis. We hypothesised that human primary airway epithelial cells are part of the first line of defense against Mtb-infection and contribute to the protective host response in the human respiratory tract. We modelled these early airway-interactions with human primary bronchial epithelial cells (PBECs) and alveolar macrophages. By combining in vitro infection and transwell co-culture models with a global transcriptomic approach, we identified PBECs to be inert to direct Mtb-infection, yet to be potent responders within an Mtb-activated immune network, mediated by IL1β and type I interferon (IFN). Activation of PBECs by Mtb-infected alveolar macrophages and monocytes increased expression of known and novel antimycobacterial peptides, defensins and S100-family members and epithelial-myeloid interactions further shaped the immunological environment during Mtb-infection by promoting neutrophil influx. This is the first in depth analysis of the primary epithelial response to infection and offers new insights into their emerging role in tuberculosis through complementing and amplifying responses to Mtb. Mycobacterium tuberculosis (Mtb) is the causative agent of tuberculosis, which remains a major public health burden today. In the majority of cases, infection is acquired by inhalation of aerosolised bacteria. Mtb is thought to target alveolar macrophages in the lower airways to establish infection. However, the cells predominantly lining the respiratory tract are epithelial cells and thus are likely crucial during the early host-pathogen interactions. We recovered primary human bronchial epithelial cells from healthy volunteers to assess their global transcriptomic response to direct Mtb-exposure and exposure to Mtb-infected myeloid cells. Our analysis revealed that, while being inert to direct Mtb-infection, epithelial cells were highly responsive to soluble mediators released by infected macrophages. The epithelial response induced by this cellular cross-talk, promoted neutrophil influx in vitro as well as the increase of antimycobaterial host responses. Our data provide novel and unexpected insights into the role of the primary human airway epithelium and define a non-redundant role for epithelial cells in shaping the local immunological environment at the site of initial Mtb infection.
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Affiliation(s)
- Ann-Kathrin Reuschl
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Michael R. Edwards
- Department of Cytopathology, Imperial College London, St Mary’s Hospital, Imperial College NHS Trust, London, United Kingdom
| | - Robert Parker
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - David W. Connell
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Long Hoang
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Alice Halliday
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Hannah Jarvis
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Nazneen Siddiqui
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Corrina Wright
- Respiratory Medicine, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, Norfolk Place, London, United Kingdom
| | - Samuel Bremang
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Sandra M. Newton
- Section of Paediatrics, Department of Medicine, St Mary’s Campus, Imperial College, London, United Kingdom
| | - Peter Beverley
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Robin J. Shattock
- Department of Medicine, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Onn Min Kon
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
| | - Ajit Lalvani
- Tuberculosis Research Centre, National Heart and Lung Institute, Imperial College London, St Mary’s Campus, London, United Kingdom
- * E-mail:
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Guan X, Hou Y, Sun F, Yang Z, Li C. Dysregulated Chemokine Signaling in Cystic Fibrosis Lung Disease: A Potential Therapeutic Target. Curr Drug Targets 2017; 17:1535-44. [PMID: 26648071 DOI: 10.2174/1389450117666151209120516] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 10/27/2015] [Accepted: 10/28/2015] [Indexed: 12/26/2022]
Abstract
CF lung disease is characterized by a chronic and non-resolving activation of the innate immune system with excessive release of chemokines/cytokines including IL-8 and persistent infiltration of immune cells, mainly neutrophils, into the airways. Chronic infection and impaired immune response eventually lead to pulmonary damage characterized by bronchiectasis, emphysema, and lung fibrosis. As a complete knowledge of the pathways responsible for the exaggerated inflammatory response in CF lung disease is lacking, understanding these pathways could reveal new therapeutic targets, and lead to novel treatments. Therefore, there is a strong rationale for the identification of mechanisms and pathways underlying the exaggerated inflammatory response in CF lung disease. This article reviews the role of inflammation in the pathogenesis of CF lung disease, with a focus on the dysregulated signaling involved in the overexpression of chemokine IL-8 and excessive recruitment of neutrophils in CF airways. The findings suggest that targeting the exaggerated IL-8/IL-8 receptor (mainly CXCR2) signaling pathway in immune cells (especially neutrophils) may represent a potential therapeutic strategy for CF lung disease.
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Affiliation(s)
| | | | | | - Zhe Yang
- Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine. 540 E. Canfield Avenue, 5312 Scott Hall, Detroit, MI 48201, USA
| | - Chunying Li
- Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine. 540 E. Canfield Avenue, 5312 Scott Hall, Detroit, MI 48201, USA
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Ban GY, Pham DL, Trinh THK, Lee SI, Suh DH, Yang EM, Ye YM, Shin YS, Chwae YJ, Park HS. Autophagy mechanisms in sputum and peripheral blood cells of patients with severe asthma: a new therapeutic target. Clin Exp Allergy 2016; 46:48-59. [PMID: 26112695 DOI: 10.1111/cea.12585] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 06/02/2015] [Accepted: 06/19/2015] [Indexed: 01/07/2023]
Abstract
BACKGROUND Autophagy and genetic predisposition have been suggested to potentially play roles in the development of asthma. However, little is known about the role of autophagy in the pathogenesis of severe asthma. OBJECTIVE We compared autophagy in the sputum granulocytes, peripheral blood cells (PBCs) and peripheral blood eosinophils (PBEs) between patients with severe asthma and those with non-severe asthma and investigated the functional effects of autophagy. METHODS We enrolled 36 patients with severe asthma, 14 with non-severe asthma and 23 normal healthy controls in this study. Sputum granulocytes, PBCs and PBEs were isolated from each subject. Autophagy was evaluated based on the expression of microtubule-associated protein light chain 3 (LC3) by Western blot, confocal microscopy, transmission electron microscopy and flow cytometry. IL-8 levels were measured by ELISA. To induce autophagy, HL-60 cells, human primary small airway epithelial cells (SAECs) and A549 cells were treated with IL-5, IL-1β and TNF-α. To inhibit autophagy, PI3K inhibitors (LY29400 and 3-methyladenine [3-MA]) and hydroxychloroquine (HCQ) were used. Knockdown of ATG5 and Beclin-1 was performed in A549 cells, and the therapeutic effects of dexamethasone were evaluated. RESULTS Higher autophagy levels were noted in sputum granulocytes, PBCs and PBEs from patients with severe asthma than from patients with non-severe asthma and healthy controls (P < 0.05 for all). IL-5 increased autophagy levels in both PBCs and PBEs (P < 0.05). 3-MA attenuated the increased expression of LC3-II and eosinophil cationic protein in HL-60 cells induced by IL-5 (P = 0.034 for both). Dexamethasone did not affect autophagy levels in PBEs. IL-1β increased LC3-II expression and IL-8 production (P < 0.01) in SAECs, and this was attenuated by LY294002, 3-MA, HCQ and knockdown of ATG5 and Beclin-1 (in A549 cells) (P < 0.01). CONCLUSIONS AND CLINICAL RELEVANCE Autophagy could play a role in the pathogenesis of severe asthma. Autophagy modulation may be a novel therapeutic target for conventional therapy-resistant severe asthma.
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Affiliation(s)
- G-Y Ban
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - D L Pham
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea.,Department of Biomedical Sciences, The Graduate School, Ajou University, Suwon, South Korea
| | - T H K Trinh
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - S-I Lee
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - D-H Suh
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - E-M Yang
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - Y-M Ye
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - Y S Shin
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea
| | - Y-J Chwae
- Department of Biomedical Sciences, The Graduate School, Ajou University, Suwon, South Korea.,Department of Microbiology, Ajou University School of Medicine, Suwon, South Korea
| | - H-S Park
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, South Korea.,Department of Biomedical Sciences, The Graduate School, Ajou University, Suwon, South Korea
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Chun YH, Park JY, Lee H, Kim HS, Won S, Joe HJ, Chung WJ, Yoon JS, Kim HH, Kim JT, Lee JS. Rhinovirus-Infected Epithelial Cells Produce More IL-8 and RANTES Compared With Other Respiratory Viruses. ALLERGY, ASTHMA & IMMUNOLOGY RESEARCH 2013; 5:216-23. [PMID: 23814675 PMCID: PMC3695236 DOI: 10.4168/aair.2013.5.4.216] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 10/15/2012] [Accepted: 11/13/2012] [Indexed: 12/31/2022]
Abstract
Purpose The environmental factors human rhinoviruses (HRVs) and house dust mites (HDMs) are the most common causes of acute exacerbations of asthma. The aim of this study was to compare the chemokine production induced by HRVs in airway epithelial cells with that induced by other respiratory viruses, and to investigate synergistic interactions between HRVs and HDMs on the induction of inflammatory chemokines in vitro. Methods A549 human airway epithelial cells were infected with either rhinovirus serotype 7, respiratory syncytial virus (RSV)-A2 strain, or adenovirus serotype 3 and analyzed for interleukin (IL)-8 and regulated on activation, normal T-cell expressed and secreted (RANTES) release and mRNA expression. Additionally, activation of nuclear factor (NF)-κB and activator protein (AP)-1 were evaluated. The release of IL-8 and RANTES was also measured in cells stimulated simultaneously with a virus and the HDM allergen, Der f1. Results HRV caused greater IL-8 and RANTES release and mRNA expression compared with either RSV or adenovirus. NF-κB and AP-1 were activated in these processes. Cells incubated with a virus and Der f1 showed an increased IL-8 release. However, compared with cells incubated with virus alone as the stimulator, only HRV with Der f1 showed a statistically significant increase. Conclusions IL-8 and RANTES were induced to a greater extent by HRV compared with other viruses, and only HRV with Der f1 acted synergistically to induce bronchial epithelial IL-8 release. These findings may correspond with the fact that rhinoviruses are identified more frequently than other viruses in cases of acute exacerbation of asthma.
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Affiliation(s)
- Yoon Hong Chun
- Department of Pediatrics, School of Medicine, The Catholic University of Korea, Seoul, Korea
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Pringle EJ, Richardson HB, Miller D, Cornish DS, Devereux GS, Walsh GM, Turner SW. Nasal and bronchial airway epithelial cell mediator release in children. Pediatr Pulmonol 2012; 47:1215-25. [PMID: 23024038 DOI: 10.1002/ppul.22672] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 06/27/2012] [Indexed: 11/07/2022]
Abstract
OBJECTIVE The present study was designed to test the hypothesis that airway epithelial cell (AEC) mediator release is similar in upper and lower airway AEC in children. METHODS Nasal and bronchial AEC were collected by brushings from children scheduled for general anesthetic. AEC release of the following mediators was measured: interleukin (IL)-6, IL-8, Granulocyte Colony Stimulating Factor (G-CSF), regulated on activation, normal T-cell expressed and secreted (RANTES), monocyte chemoattractant protein-1 (MCP-1), vascular endothelial growth factor (VEGF), matrix metallo proteinase (MMP)-9, and tissue inhibitor of metalloproteinases (TIMP)-1. RESULTS AEC were cultured in 34 children, mean age 7.3 years. Release of IL-6, IL-8, and G-CSF was significantly higher in nasal compared with bronchial AEC but nasal and bronchial AEC release of other mediators was not significantly different. Treatment of AEC with IL-1 β and tumor necrosis factor-α increased secretion of all mediators. Release of IL-6 and GSCF remained higher in nasal AEC compared with bronchial AEC following stimulation. CONCLUSIONS In epidemiological studies, nasal AEC may be a useful surrogate for bronchial AEC for the study of RANTES, MCP-1, TIMP-1, and MMP-9 release in children but bronchial AEC will remain the gold standard.
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Proinflammatory and Th2 cytokines regulate the high affinity IgE receptor (FcepsilonRI) and IgE-dependant activation of human airway smooth muscle cells. PLoS One 2009; 4:e6153. [PMID: 19582151 PMCID: PMC2701636 DOI: 10.1371/journal.pone.0006153] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Accepted: 06/15/2009] [Indexed: 01/13/2023] Open
Abstract
Background The high affinity IgE receptor (FcεRI) is a crucial structure for IgE-mediated allergic reactions. We have previously demonstrated that human airway smooth muscle (ASM) cells express the tetrameric (αβγ2) FcεRI, and its activation leads to marked transient increases in intracellular Ca2+ concentration, release of Th-2 cytokines and eotaxin-1/CCL11. Therefore, it was of utmost importance to delineate the factors regulating the expression of FcεRI in human (ASM) cells. Methodology/Principal Findings Incubation of human bronchial and tracheal smooth muscle (B/TSM) cells with TNF-α, IL-1β or IL-4 resulted in a significant increase in FcεRI-α chain mRNA expression (p<0.05); and TNF-α, IL-4 enhanced the FcεRI-α protein expression compared to the unstimulated control at 24, 72 hrs after stimulation. Interestingly, among all other cytokines, only TNF-α upregulated the FcεRI-γ mRNA expression. FcεRI-γ protein expression remained unchanged despite the nature of stimulation. Of note, as a functional consequence of FcεRI upregulation, TNF-α pre-sensitization of B/TSM potentially augmented the CC (eotaxin-1/CCL11 and RANTES/CCL5, but not TARC/CCL17) and CXC (IL-8/CXCL8, IP-10/CXCL10) chemokines release following IgE stimulation (p<0.05, n = 3). Furthermore, IgE sensitization of B/TSM cells significantly enhanced the transcription of selective CC and CXC chemokines at promoter level compared to control, which was abolished by Lentivirus-mediated silencing of Syk expression. Conclusions/Significance Our data depict a critical role of B/TSM in allergic airway inflammation via potentially novel mechanisms involving proinflammatory, Th2 cytokines and IgE/FcεRI complex.
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