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Barman TK, Metzger DW. Disease Tolerance during Viral-Bacterial Co-Infections. Viruses 2021; 13:v13122362. [PMID: 34960631 PMCID: PMC8706933 DOI: 10.3390/v13122362] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 10/29/2021] [Accepted: 11/23/2021] [Indexed: 11/16/2022] Open
Abstract
Disease tolerance has emerged as an alternative way, in addition to host resistance, to survive viral-bacterial co-infections. Disease tolerance plays an important role not in reducing pathogen burden, but in maintaining tissue integrity and controlling organ damage. A common co-infection is the synergy observed between influenza virus and Streptococcus pneumoniae that results in superinfection and lethality. Several host cytokines and cells have shown promise in promoting tissue protection and damage control while others induce severe immunopathology leading to high levels of morbidity and mortality. The focus of this review is to describe the host cytokines and innate immune cells that mediate disease tolerance and lead to a return to host homeostasis and ultimately, survival during viral-bacterial co-infection.
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Abstract
Transforming Growth Factor-β is a potent regulator of the immune system, acting at every stage from thymic differentiation, population of the periphery, control of responsiveness, tissue repair and generation of memory. It is therefore a central player in the immune response to infectious pathogens, but its contribution is often clouded by multiple roles acting on different cells in time and space. Hence, context is all-important in understanding when TGF-β is beneficial or detrimental to the outcome of infection. In this review, a full range of infectious agents from viruses to helminth parasites are explored within this framework, drawing contrasts and general conclusions about the importance of TGF-β in these diseases.
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Affiliation(s)
- Rick M Maizels
- Wellcome Centre for Integrative Parasitology, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, United Kingdom.
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3
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Henschen AE, Adelman JS. What Does Tolerance Mean for Animal Disease Dynamics When Pathology Enhances Transmission? Integr Comp Biol 2020; 59:1220-1230. [PMID: 31141137 DOI: 10.1093/icb/icz065] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Host competence, or how well an individual transmits pathogens, varies substantially within and among animal populations. As this variation can alter the course of epidemics and epizootics, revealing its underlying causes will help predict and control the spread of disease. One host trait that could drive heterogeneity in competence is host tolerance, which minimizes fitness losses during infection without decreasing pathogen load. In many cases, tolerance should increase competence by extending infectious periods and enabling behaviors that facilitate contact among hosts. However, we argue that the links between tolerance and competence are more varied. Specifically, the different physiological and behavioral mechanisms by which hosts achieve tolerance should have a range of effects on competence, enhancing the ability to transmit pathogens in some circumstances and impeding it in others. Because tissue-based pathology (damage) that reduces host fitness is often critical for pathogen transmission, we focus on two mechanisms that can underlie tolerance at the tissue level: damage-avoidance and damage-repair. As damage-avoidance reduces transmission-enhancing pathology, this mechanism is likely to decrease host competence and pathogen transmission. In contrast, damage-repair does not prevent transmission-relevant pathology from occurring. Rather, damage-repair provides new, healthy tissues that pathogens can exploit, likely extending the infectious period and increasing host competence. We explore these concepts through graphical models and present three disease systems in which damage-avoidance and damage-repair alter host competence in the predicted directions. Finally, we suggest that by incorporating these links, future theoretical studies could provide new insights into infectious disease dynamics and host-pathogen coevolution.
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Affiliation(s)
- Amberleigh E Henschen
- Department of Natural Resource Ecology and Management, Iowa State University, 339 Science Hall II, 2310 Pammel Drive, Ames, IA 50011, USA
| | - James S Adelman
- Department of Natural Resource Ecology and Management, Iowa State University, 339 Science Hall II, 2310 Pammel Drive, Ames, IA 50011, USA
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Benam KH, Denney L, Ho LP. How the Respiratory Epithelium Senses and Reacts to Influenza Virus. Am J Respir Cell Mol Biol 2019; 60:259-268. [PMID: 30372120 DOI: 10.1165/rcmb.2018-0247tr] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The human lung is constantly exposed to the environment and potential pathogens. As the interface between host and environment, the respiratory epithelium has evolved sophisticated sensing mechanisms as part of its defense against pathogens. In this review, we examine how the respiratory epithelium senses and responds to influenza A virus, the biggest cause of respiratory viral deaths worldwide.
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Affiliation(s)
- Kambez H Benam
- 1 Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado - Anschutz Medical Campus, Aurora, Colorado.,2 Department of Bioengineering, University of Colorado Denver, Aurora, Colorado; and
| | - Laura Denney
- 3 Translational Lung Immunology Programme, MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
| | - Ling-Pei Ho
- 3 Translational Lung Immunology Programme, MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
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5
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Denney L, Ho LP. The role of respiratory epithelium in host defence against influenza virus infection. Biomed J 2018; 41:218-233. [PMID: 30348265 PMCID: PMC6197993 DOI: 10.1016/j.bj.2018.08.004] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 08/03/2018] [Accepted: 08/03/2018] [Indexed: 12/18/2022] Open
Abstract
The respiratory epithelium is the major interface between the environment and the host. Sophisticated barrier, sensing, anti-microbial and immune regulatory mechanisms have evolved to help maintain homeostasis and to defend the lung against foreign substances and pathogens. During influenza virus infection, these specialised structural cells and populations of resident immune cells come together to mount the first response to the virus, one which would play a significant role in the immediate and long term outcome of the infection. In this review, we focus on the immune defence machinery of the respiratory epithelium and briefly explore how it repairs and regenerates after infection.
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Affiliation(s)
- Laura Denney
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Ling-Pei Ho
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK.
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6
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Seon SH, Rhee DK. Effective prevention of secondary pneumococcal infection following influenza virus infection. Future Microbiol 2018; 13:953-955. [PMID: 29947557 DOI: 10.2217/fmb-2018-0129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Affiliation(s)
- Seung Han Seon
- School of Pharmacy, Sungkyunkwan University, Su-Won 16419, South Korea
| | - Dong-Kwon Rhee
- School of Pharmacy, Sungkyunkwan University, Su-Won 16419, South Korea
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7
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Meunier I, Kaufmann E, Downey J, Divangahi M. Unravelling the networks dictating host resistance versus tolerance during pulmonary infections. Cell Tissue Res 2017; 367:525-536. [PMID: 28168323 PMCID: PMC7088083 DOI: 10.1007/s00441-017-2572-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 01/05/2017] [Indexed: 12/19/2022]
Abstract
The appearance of single cell microorganisms on earth dates back to more than 3.5 billion years ago, ultimately leading to the development of multicellular organisms approximately 3 billion years later. The evolutionary burst of species diversity and the “struggle for existence”, as proposed by Darwin, generated a complex host defense system. Host survival during infection in vital organs, such as the lung, requires a delicate balance between host defense, which is essential for the detection and elimination of pathogens and host tolerance, which is critical for minimizing collateral tissue damage. Whereas the cellular and molecular mechanisms of host defense against many invading pathogens have been extensively studied, our understanding of host tolerance as a key mechanism in maintaining host fitness is extremely limited. This may also explain why current therapeutic and preventive approaches targeting only host defense mechanisms have failed to provide full protection against severe infectious diseases, including pulmonary influenza virus and Mycobacterium tuberculosis infections. In this review, we aim to outline various host strategies of resistance and tolerance for effective protection against acute or chronic pulmonary infections.
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Affiliation(s)
- Isabelle Meunier
- Department of Medicine, Department of Microbiology & Immunology, and Department of Pathology, McGill University Health Centre, McGill International TB Centre, Meakins-Christie Laboratories, McGill University, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3J1, Canada
| | - Eva Kaufmann
- Department of Medicine, Department of Microbiology & Immunology, and Department of Pathology, McGill University Health Centre, McGill International TB Centre, Meakins-Christie Laboratories, McGill University, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3J1, Canada
| | - Jeffrey Downey
- Department of Medicine, Department of Microbiology & Immunology, and Department of Pathology, McGill University Health Centre, McGill International TB Centre, Meakins-Christie Laboratories, McGill University, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3J1, Canada
| | - Maziar Divangahi
- Department of Medicine, Department of Microbiology & Immunology, and Department of Pathology, McGill University Health Centre, McGill International TB Centre, Meakins-Christie Laboratories, McGill University, 1001 Decarie Boulevard, Montreal, Quebec, H4A 3J1, Canada. .,RI-MUHC, Centre for Translational Biology, Meakins-Christie Laboratories, McGill University, 1001 Decarie Boulevard, Block E (EM3.2248), Montreal, Quebec, H4A 3J1, Canada.
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8
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Li Y, Ming F, Huang H, Guo K, Chen H, Jin M, Zhou H. Proteome Response of Chicken Embryo Fibroblast Cells to Recombinant H5N1 Avian Influenza Viruses with Different Neuraminidase Stalk Lengths. Sci Rep 2017; 7:40698. [PMID: 28079188 PMCID: PMC5227709 DOI: 10.1038/srep40698] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 11/23/2016] [Indexed: 12/12/2022] Open
Abstract
The variation on neuraminidase (NA) stalk region of highly pathogenic avian influenza H5N1 virus results in virulence change in animals. In our previous studies, the special NA stalk-motif of H5N1 viruses has been demonstrated to play a significant role in the high virulence and pathogenicity in chickens. However, the molecular mechanisms underlying the pathogenicity of viruses with different NA stalk remain poorly understood. This study presents a comprehensive characterization of the proteome response of chicken cells to recombinant H5N1 virus with stalk-short NA (rNA-wt) and the stalkless NA mutant virus (rSD20). 208 proteins with differential abundance profiles were identified differentially expressed (DE), and these proteins were mainly related to stress response, transcription regulation, transport, metabolic process, cellular component and cytoskeleton. Through Ingenuity Pathways Analysis (IPA), the significant biological functions of DE proteins represented included Post-Translational Modification, Protein Folding, DNA Replication, Recombination and Repair. It was interesting to find that most DE proteins were involved in the TGF-β mediated functional network. Moreover, the specific DE proteins may play important roles in the innate immune responses and H5N1 virus replication. Our data provide important information regarding the comparable host response to H5N1 influenza virus infection with different NA stalk lengths.
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Affiliation(s)
- Yongtao Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, P.R. China.,College of Animal Husbandry &Veterinary Science, Henan Agricultural University, Zhengzhou, 450002, P.R. China
| | - Fan Ming
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, P.R. China
| | - Huimin Huang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, P.R. China
| | - Kelei Guo
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, P.R. China
| | - Huanchun Chen
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, P.R. China
| | - Meilin Jin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, P.R. China
| | - Hongbo Zhou
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, P.R. China
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9
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Sviriaeva EN, Korneev KV, Drutskaya MS, Kuprash DV. Mechanisms of Changes in Immune Response during Bacterial Coinfections of the Respiratory Tract. BIOCHEMISTRY (MOSCOW) 2016; 81:1340-1349. [PMID: 27914459 DOI: 10.1134/s0006297916110110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Acute diseases of the respiratory tract are often caused by viral pathogens and accompanying secondary bacterial infections. It is known that the development of such bacterial complications is caused mainly by a decreased infiltration with immune system cells and by suppressed inflammation in the lungs. There are significant advances in understanding the mechanisms of secondary infections, although many details remain unclear. This review summarizes current knowledge of the molecular and cellular changes in the host organism that can influence the course of bacterial coinfections in the respiratory tract.
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Affiliation(s)
- E N Sviriaeva
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia.
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10
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Alvanegh AG, Edalat H, Fallah P, Tavallaei M. Decreased expression of miR-20a and miR-92a in the serum from sulfur mustard-exposed patients during the chronic phase of resulting illness. Inhal Toxicol 2015; 27:682-8. [PMID: 26525353 DOI: 10.3109/08958378.2015.1096982] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
CONTEXT Sulfur mustard (SM), with extensive nucleophilic and alkylating properties, was employed during the Iran-Iraq war by Iraqi forces. The most critical complications attributed to SM are related to dangerous pulmonary disorders collectively known as "mustard lung". The symptoms gradually emerge over a long period, becoming chronic, and are dependent on time and the amount of exposed SM. Because of the unknown and complex nature of the disease, no differential diagnostic method or absolute treatment strategy has been formally developed. OBJECTIVE The aim of our study was to determine the expression pattern of the microRNAs (miRNAs) miR-92a and miR-20a in the serum of patients with mustard lung along with that of normal individuals. miRNAs have been shown to possess stable persistence in biofluids like plasma and serum and are considered non-aggressive biomarkers helpful for diagnosis and treatment of many diseases. MATERIALS AND METHODS A highly sensitive approach called stem-loop real-time quantitative polymerase chain reaction was employed to study the expression of miRNAs. RESULTS The expression of miR-92a and miR-20a was significantly down-regulated in the serum of patients with mustard lung compared to the control group. DISCUSSION Down-regulation of miR-92a and miR-20a may be due to chronic epigenetic alterations after SM exposure, which finally leads to changes in vital cellular processes such as differentiation, proliferation and so forth. CONCLUSION Our findings may provide a differential diagnostic method that is effective for diagnosing lung diseases caused by SM exposure. Additionally, these miRNAs may be regarded as probable targets for treatment of lung injuries.
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Affiliation(s)
- Akbar Ghorbani Alvanegh
- a Human Genetics Research Center, Baqiyatallah Medical Sciences University , Tehran , Iran and
| | - Houri Edalat
- a Human Genetics Research Center, Baqiyatallah Medical Sciences University , Tehran , Iran and
| | - Parviz Fallah
- b Laboratory Sciences Department , Alborz University of Medical Sciences , Karaj , Iran
| | - Mahmood Tavallaei
- a Human Genetics Research Center, Baqiyatallah Medical Sciences University , Tehran , Iran and
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11
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Furuya Y, Furuya AKM, Roberts S, Sanfilippo AM, Salmon SL, Metzger DW. Prevention of Influenza Virus-Induced Immunopathology by TGF-β Produced during Allergic Asthma. PLoS Pathog 2015; 11:e1005180. [PMID: 26407325 PMCID: PMC4583434 DOI: 10.1371/journal.ppat.1005180] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 09/01/2015] [Indexed: 12/14/2022] Open
Abstract
Asthma is believed to be a risk factor for influenza infection, however little experimental evidence exists to directly demonstrate the impact of asthma on susceptibility to influenza infection. Using a mouse model, we now report that asthmatic mice are actually significantly more resistant to a lethal influenza virus challenge. Notably, the observed increased resistance was not attributable to enhanced viral clearance, but instead, was due to reduced lung inflammation. Asthmatic mice exhibited a significantly reduced cytokine storm, as well as reduced total protein levels and cytotoxicity in the airways, indicators of decreased tissue injury. Further, asthmatic mice had significantly increased levels of TGF-β1 and the heightened resistance of asthmatic mice was abrogated in the absence of TGF-β receptor II. We conclude that a transient increase in TGF-β expression following acute asthma can induce protection against influenza-induced immunopathology. Influenza and asthma represent the two major lung diseases in humans. While most studies have focused on exacerbation of asthma symptoms by influenza virus infection, the effects of asthma on susceptibility to influenza virus infections has been far less studied. Using a novel mouse model of asthma and influenza infection, we show that asthmatic mice are highly resistant to primary challenge with the 2009 influenza pandemic strain (CA04) compared to non-asthmatic mice. The increased resistance of asthmatic mice is not due to the enhanced T or B cell immunity but rather, to a strong anti-inflammatory TGF-beta response triggered by asthma. This study is the first to provide a mechanistic explanation for asthma-mediated protection during the 2009 influenza pandemic.
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Affiliation(s)
- Yoichi Furuya
- Center for Immunology and Microbial Disease, Albany Medical College, Albany, New York, United States of America
| | - Andrea K. M. Furuya
- Center for Immunology and Microbial Disease, Albany Medical College, Albany, New York, United States of America
| | - Sean Roberts
- Center for Immunology and Microbial Disease, Albany Medical College, Albany, New York, United States of America
| | - Alan M. Sanfilippo
- Center for Immunology and Microbial Disease, Albany Medical College, Albany, New York, United States of America
| | - Sharon L. Salmon
- Center for Immunology and Microbial Disease, Albany Medical College, Albany, New York, United States of America
| | - Dennis W. Metzger
- Center for Immunology and Microbial Disease, Albany Medical College, Albany, New York, United States of America
- * E-mail:
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12
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Jolly L, Stavrou A, Vanderstoken G, Meliopoulos VA, Habgood A, Tatler AL, Porte J, Knox A, Weinreb P, Violette S, Hussell T, Kolb M, Stampfli MR, Schultz-Cherry S, Jenkins G. Influenza promotes collagen deposition via αvβ6 integrin-mediated transforming growth factor β activation. J Biol Chem 2014; 289:35246-63. [PMID: 25339175 DOI: 10.1074/jbc.m114.582262] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Influenza infection exacerbates chronic pulmonary diseases, including idiopathic pulmonary fibrosis. A central pathway in the pathogenesis of idiopathic pulmonary fibrosis is epithelial injury leading to activation of transforming growth factor β (TGFβ). The mechanism and functional consequences of influenza-induced activation of epithelial TGFβ are unclear. Influenza stimulates toll-like receptor 3 (TLR3), which can increase RhoA activity, a key event prior to activation of TGFβ by the αvβ6 integrin. We hypothesized that influenza would stimulate TLR3 leading to activation of latent TGFβ via αvβ6 integrin in epithelial cells. Using H1152 (IC50 6.1 μm) to inhibit Rho kinase and 6.3G9 to inhibit αvβ6 integrins, we demonstrate their involvement in influenza (A/PR/8/34 H1N1) and poly(I:C)-induced TGFβ activation. We confirm the involvement of TLR3 in this process using chloroquine (IC50 11.9 μm) and a dominant negative TLR3 construct (pZERO-hTLR3). Examination of lungs from influenza-infected mice revealed augmented levels of collagen deposition, phosphorylated Smad2/3, αvβ6 integrin, and apoptotic cells. Finally, we demonstrate that αvβ6 integrin-mediated TGFβ activity following influenza infection promotes epithelial cell death in vitro and enhanced collagen deposition in vivo and that this response is diminished in Smad3 knock-out mice. These data show that H1N1 and poly(I:C) can induce αvβ6 integrin-dependent TGFβ activity in epithelial cells via stimulation of TLR3 and suggest a novel mechanism by which influenza infection may promote collagen deposition in fibrotic lung disease.
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Affiliation(s)
- Lisa Jolly
- From the Nottingham Respiratory Research Unit, University of Nottingham, Nottingham University Hospitals, Clinical Sciences Building, City Hospital Campus, Nottingham NG5 1PB, United Kingdom
| | - Anastasios Stavrou
- From the Nottingham Respiratory Research Unit, University of Nottingham, Nottingham University Hospitals, Clinical Sciences Building, City Hospital Campus, Nottingham NG5 1PB, United Kingdom
| | - Gilles Vanderstoken
- the McMaster Immunology Research Centre and Firestone Institute at St. Joseph's Health Care, McMaster University, Hamilton, Ontario L8S4L8, Canada, and
| | - Victoria A Meliopoulos
- the Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Anthony Habgood
- From the Nottingham Respiratory Research Unit, University of Nottingham, Nottingham University Hospitals, Clinical Sciences Building, City Hospital Campus, Nottingham NG5 1PB, United Kingdom
| | - Amanda L Tatler
- From the Nottingham Respiratory Research Unit, University of Nottingham, Nottingham University Hospitals, Clinical Sciences Building, City Hospital Campus, Nottingham NG5 1PB, United Kingdom
| | - Joanne Porte
- From the Nottingham Respiratory Research Unit, University of Nottingham, Nottingham University Hospitals, Clinical Sciences Building, City Hospital Campus, Nottingham NG5 1PB, United Kingdom
| | - Alan Knox
- From the Nottingham Respiratory Research Unit, University of Nottingham, Nottingham University Hospitals, Clinical Sciences Building, City Hospital Campus, Nottingham NG5 1PB, United Kingdom
| | - Paul Weinreb
- Biogen Idec Inc., Cambridge, Massachusetts 02142
| | | | - Tracy Hussell
- the Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester M13 9NT, United Kingdom
| | - Martin Kolb
- the McMaster Immunology Research Centre and Firestone Institute at St. Joseph's Health Care, McMaster University, Hamilton, Ontario L8S4L8, Canada, and
| | - Martin R Stampfli
- the McMaster Immunology Research Centre and Firestone Institute at St. Joseph's Health Care, McMaster University, Hamilton, Ontario L8S4L8, Canada, and
| | - Stacey Schultz-Cherry
- the Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Gisli Jenkins
- From the Nottingham Respiratory Research Unit, University of Nottingham, Nottingham University Hospitals, Clinical Sciences Building, City Hospital Campus, Nottingham NG5 1PB, United Kingdom,
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13
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Iwasaki A, Pillai PS. Innate immunity to influenza virus infection. Nat Rev Immunol 2014; 14:315-28. [PMID: 24762827 DOI: 10.1038/nri3665] [Citation(s) in RCA: 793] [Impact Index Per Article: 79.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Influenza viruses are a major pathogen of both humans and animals. Recent studies using gene-knockout mice have led to an in-depth understanding of the innate sensors that detect influenza virus infection in a variety of cell types. Signalling downstream of these sensors induces distinct sets of effector mechanisms that block virus replication and promote viral clearance by inducing innate and adaptive immune responses. In this Review, we discuss the various ways in which the innate immune system uses pattern recognition receptors to detect and respond to influenza virus infection. We consider whether the outcome of innate sensor stimulation promotes antiviral resistance or disease tolerance, and propose rational treatment strategies for the acute respiratory disease that is caused by influenza virus infection.
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Affiliation(s)
- Akiko Iwasaki
- Department of Immunobiology, Yale University School of Medicine, 300 Cedar Street, New Haven, Connecticut 06520, USA
| | - Padmini S Pillai
- Department of Immunobiology, Yale University School of Medicine, 300 Cedar Street, New Haven, Connecticut 06520, USA
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14
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Gao P, Zhou Y, Xian L, Li C, Xu T, Plunkett B, Huang SK, Wan M, Cao X. Functional effects of TGF-β1 on mesenchymal stem cell mobilization in cockroach allergen-induced asthma. THE JOURNAL OF IMMUNOLOGY 2014; 192:4560-4570. [PMID: 24711618 DOI: 10.4049/jimmunol.1303461] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Mesenchymal stem cells (MSCs) have been suggested to participate in immune regulation and airway repair/remodeling. TGF-β1 is critical in the recruitment of stem/progenitor cells for tissue repair, remodeling, and cell differentiation. In this study, we sought to investigate the role of TGF-β1 in MSC migration in allergic asthma. We examined nestin expression (a marker for MSCs) and TGF-β1 signaling activation in airways in cockroach allergen extract (CRE)-induced mouse models. Compared with control mice, there were increased nestin(+) cells in airways and higher levels of active TGF-β1 in serum and p-Smad2/3 expression in lungs of CRE-treated mice. Increased activation of TGF-β1 signaling was also found in CRE-treated MSCs. We then assessed MSC migration induced by conditioned medium from CRE-challenged human epithelium in air/liquid interface culture in Transwell assays. MSC migration was stimulated by epithelial-conditioned medium, but was significantly inhibited by either TGF-β1-neutralizing Ab or TβR1 inhibitor. Intriguingly, increased migration of MSCs from blood and bone marrow to the airway was also observed after systemic injection of GFP(+) MSCs and from bone marrow of Nes-GFP mice following CRE challenge. Furthermore, TGF-β1-neutralizing Ab inhibited the CRE-induced MSC recruitment, but promoted airway inflammation. Finally, we investigated the role of MSCs in modulating CRE-induced T cell response and found that MSCs significantly inhibited CRE-induced inflammatory cytokine secretion (IL-4, IL-13, IL-17, and IFN-γ) by CD4(+) T cells. These results suggest that TGF-β1 may be a key promigratory factor in recruiting MSCs to the airways in mouse models of asthma.
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Affiliation(s)
- Peisong Gao
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Yufeng Zhou
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Lingling Xian
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Changjun Li
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Ting Xu
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Beverly Plunkett
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Shau-Ku Huang
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,National Health Research Institutes, Taiwan
| | - Mei Wan
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Xu Cao
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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15
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Coelho C, Bocca AL, Casadevall A. The intracellular life of Cryptococcus neoformans. ANNUAL REVIEW OF PATHOLOGY-MECHANISMS OF DISEASE 2013; 9:219-38. [PMID: 24050625 DOI: 10.1146/annurev-pathol-012513-104653] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Cryptococcus neoformans is a fungal pathogen with worldwide distribution. Serological studies of human populations show a high prevalence of human infection, which rarely progresses to disease in immunocompetent hosts. However, decreased host immunity places individuals at high risk for cryptococcal disease. The disease can result from acute infection or reactivation of latent infection, in which yeasts within granulomas and host macrophages emerge to cause disease. In this review, we summarize what is known about the cellular recognition, ingestion, and killing of C. neoformans and discuss the unique and remarkable features of its intracellular life, including the proposed mechanisms for fungal persistence and killing in phagocytic cells.
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Affiliation(s)
- Carolina Coelho
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York 10461;
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Hasenberg M, Stegemann-Koniszewski S, Gunzer M. Cellular immune reactions in the lung. Immunol Rev 2012; 251:189-214. [DOI: 10.1111/imr.12020] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Mike Hasenberg
- Institute of Experimental Immunology and Imaging; University of Duisburg/Essen; University Hospital; Essen; Germany
| | | | - Matthias Gunzer
- Institute of Experimental Immunology and Imaging; University of Duisburg/Essen; University Hospital; Essen; Germany
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17
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Abstract
The cytokine storm has captured the attention of the public and the scientific community alike, and while the general notion of an excessive or uncontrolled release of proinflammatory cytokines is well known, the concept of a cytokine storm and the biological consequences of cytokine overproduction are not clearly defined. Cytokine storms are associated with a wide variety of infectious and noninfectious diseases. The term was popularized largely in the context of avian H5N1 influenza virus infection, bringing the term into popular media. In this review, we focus on the cytokine storm in the context of virus infection, and we highlight how high-throughput genomic methods are revealing the importance of the kinetics of cytokine gene expression and the remarkable degree of redundancy and overlap in cytokine signaling. We also address evidence for and against the role of the cytokine storm in the pathology of clinical and infectious disease and discuss why it has been so difficult to use knowledge of the cytokine storm and immunomodulatory therapies to improve the clinical outcomes for patients with severe acute infections.
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18
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Gorski SA, Hufford MM, Braciale TJ. Recent insights into pulmonary repair following virus-induced inflammation of the respiratory tract. Curr Opin Virol 2012; 2:233-41. [PMID: 22608464 PMCID: PMC3378727 DOI: 10.1016/j.coviro.2012.04.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A hallmark of infection by respiratory viruses is productive infection of and the subsequent destruction of the airway epithelium. These viruses can also target other stromal cell types as well as in certain instances, CD45(+) hematopoietic cells either resident in the lungs or part of the inflammatory response to infection. The mechanisms by which the virus produces injury to these cell types include direct infection with cytopathic effects as a consequence of replication. Host mediated damage is also a culprit in pulmonary injury as both innate and adaptive immune cells produce soluble and cell-associated pro-inflammatory mediators. Recently, it has become increasingly clear that in addition to control of excess inflammation and virus elimination, the resolution of infection requires an active repair process, which is necessary to regain normal respiratory function and restore the lungs to homeostasis. The repair response must re-establish the epithelial barrier and regenerate the microarchitecture of the lung. Emerging areas of research have highlighted the importance of innate immune cells, particularly the newly described innate lymphoid cells, as well as alternatively activated macrophages and pulmonary stem cells in the repair process. The mechanisms by which respiratory viruses may impede or alter the repair response will be important areas of research for identifying therapeutic targets aimed at limiting virus and host mediated injury and expediting recovery.
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Affiliation(s)
- Stacey A Gorski
- Beirne B. Carter Center for Immunology Research, Department of Microbiology, University of Virginia, Charlottesville, VA 22908, USA
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19
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Braciale TJ, Sun J, Kim TS. Regulating the adaptive immune response to respiratory virus infection. Nat Rev Immunol 2012; 12:295-305. [PMID: 22402670 PMCID: PMC3364025 DOI: 10.1038/nri3166] [Citation(s) in RCA: 243] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The respiratory tract is a major portal of entry for viruses into the body. Infection of the respiratory tract can, if severe, induce life-threatening damage to the lungs. Various strategies to control virus replication and to limit immune-mediated inflammation and tissue injury have evolved in the respiratory tract. Multiple innate immune cell types, particularly dendritic cells (DCs), within the pulmonary interstitium and between airway epithelial cells are strategically poised to recognize and sample airway particulates, such as viruses. In response to respiratory virus infection, several distinct DC subsets are stimulated to migrate from the site of infection in the lungs to the draining lymph nodes. Here, these migrant DCs have a crucial role in initiating the antivirus adaptive immune response to the invading viruses. After entering the infected lungs, effector T cells that were generated in the lymph nodes undergo further modifications that are shaped by the inflammatory milieu. Co-stimulatory receptor–ligand interactions between effector T cells and various cell types presenting viral antigens in the infected lungs modulate the host adaptive immune response in situ. Effector T cells that produce pro-inflammatory mediators are also the major producers of regulatory (anti-inflammatory) cytokines, providing a fine-tuning mechanism of self-control by effector T cells responding to viruses in the inflamed tissue. The immune mechanisms that control virus replication and/or excessive inflammation in the virus-infected lungs can also predispose the individual recovering from a virus infection to bacterial superinfection. Therapeutic strategies should consider balancing the need to inhibit virus replication and excessive inflammation with the need to optimize the antibacterial functions of innate immune phagocytes, which are crucial for clearing the bacteria from the lungs.
This article reviews the interplay between innate and adaptive immune cells in the response to viral infection of the lower respiratory tract and describes the fine-tuning mechanisms that control antiviral T cells in the lungs but that can also predispose an individual to subsequent pulmonary bacterial infections. Recent years have seen several advances in our understanding of immunity to virus infection of the lower respiratory tract, including to influenza virus infection. Here, we review the cellular targets of viruses and the features of the host immune response that are unique to the lungs. We describe the interplay between innate and adaptive immune cells in the induction, expression and control of antiviral immunity, and discuss the impact of the infected lung milieu on moulding the response of antiviral effector T cells. Recent findings on the mechanisms that underlie the increased frequency of severe pulmonary bacterial infections following respiratory virus infection are also discussed.
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Affiliation(s)
- Thomas J Braciale
- Beirne B. Carter Center for Immunology Research, University of Virginia, Charlottesville, Virginia 22908, USA.
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20
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Garro AP, Chiapello LS, Baronetti JL, Masih DT. Eosinophils elicit proliferation of naive and fungal-specific cells in vivo so enhancing a T helper type 1 cytokine profile in favour of a protective immune response against Cryptococcus neoformans infection. Immunology 2011; 134:198-213. [PMID: 21896014 PMCID: PMC3194227 DOI: 10.1111/j.1365-2567.2011.03479.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Revised: 06/28/2011] [Accepted: 06/30/2011] [Indexed: 01/21/2023] Open
Abstract
Experimental Cryptococcus neoformans infection in rats has been shown to have similarities with human cryptococcosis, because as in healthy humans, rats can effectively contain cryptococcal infection. Moreover, it has been shown that eosinophils are components of the immune response to C. neoformans infections. In a previous in vitro study, we demonstrated that rat peritoneal eosinophils phagocytose opsonized live yeasts of C. neoformans, thereby triggering their activation, as indicated by the up-regulation of MHC and co-stimulatory molecules and the increase in interleukin-12, tumour necrosis factor-α and interferon-γ production. Furthermore, this work demonstrated that C. neoformans-specific CD4(+) and CD8(+) T lymphocytes cultured with these activated C. neoformans-pulsed eosinophils proliferated, and produced important amounts of T helper type 1 (Th1) cytokines in the absence of Th2 cytokine synthesis. In the present in vivo study, we have shown that C. neoformans-pulsed eosinophils are also able to migrate into lymphoid organs to present C. neoformans antigens, thereby priming naive and re-stimulating infected rats to induce T-cell and B-cell responses against infection with the fungus. Furthermore, the antigen-specific immune response induced by C. neoformans-pulsed eosinophils, which is characterized by the development of a Th1 microenvironment with increased levels of NO synthesis and C. neoformans-specific immunoglobulin production, was demonstrated to be able to protect rats against subsequent infection with fungus. In summary, the present work demonstrates that eosinophils act as antigen-presenting cells for the fungal antigen, hence initiating and modulating a C. neoformans-specific immune response. Finally, we suggest that C. neoformans-loaded eosinophils might participate in the protective immune response against these fungi.
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Affiliation(s)
- Ana P Garro
- Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), CONICET, Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Medina Allende y Haya de la Torre, Ciudad Universitaria, Córdoba, Argentina
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21
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Sharma S, Raby BA, Hunninghake GM, Soto-Quirós M, Avila L, Murphy AJ, Lasky-Su J, Klanderman BJ, Sylvia JS, Weiss ST, Celedón JC. Variants in TGFB1, dust mite exposure, and disease severity in children with asthma. Am J Respir Crit Care Med 2008; 179:356-62. [PMID: 19096005 DOI: 10.1164/rccm.200808-1268oc] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
RATIONALE Polymorphisms in the gene for transforming growth factor-beta1 (TGFB1) have been associated with asthma, but not with airway responsiveness or disease exacerbations in subjects with asthma. OBJECTIVES To test for association between single nucleotide polymorphisms (SNPs) in TGFB1 and markers of asthma severity in childhood. METHODS We tested for the association between nine SNPs in TGFB1 and indicators of asthma severity (lung function, airway responsiveness, and disease exacerbations) in two cohorts: 416 Costa Rican parent-child trios and 465 families of non-Hispanic white children in the Childhood Asthma Management Program (CAMP). We also tested for the interaction between these polymorphisms and exposure to dust mite allergen on asthma severity. MEASUREMENTS AND MAIN RESULTS The A allele of promoter SNP rs2241712 was associated with increased airway responsiveness in Costa Rica (P = 0.0006) and CAMP (P = 0.005), and the C allele of an SNP in the promoter region (rs1800469) was associated with increased airway responsiveness in both cohorts (P <or= 0.01). Dust mite exposure modified the effect of the C allele of exonic SNP rs1800471 on airway responsiveness (P = 0.03 for interactions in both cohorts). The T allele of a coding SNP (rs1982073) was associated with a reduced risk of asthma exacerbations in Costa Rica (P = 0.009) and CAMP (P = 0.005). Dust mite exposure also significantly modified the effect of the A allele of the promoter SNP rs2241712 on asthma exacerbations in both cohorts. CONCLUSIONS SNPs in TGFB1 are associated with airway responsiveness and disease exacerbations in children with asthma. Moreover, dust mite exposure may modify the effect of TGFB1 SNPs on airway responsiveness and asthma exacerbations.
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Affiliation(s)
- Sunita Sharma
- Channing Laboratory, Brigham and Women's Hospital, Boston, Massachusetts, USA.
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22
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Evaluation of breed-dependent differences in the innate immune responses of Holstein and Jersey cows toStaphylococcus aureusintramammary infection. J DAIRY RES 2008; 75:291-301. [DOI: 10.1017/s0022029908003427] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Mastitis is one of the most prevalent diseases of cattle. Various studies have reported breed-dependent differences in the risk for developing this disease. Among two major breeds, Jersey cows have been identified as having a lower prevalence of mastitis than Holstein cows. It is well established that the nature of the initial innate immune response to infection influences the ability of the host to clear harmful bacterial pathogens. Whether differences in the innate immune response to intramammary infections explain, in part, the differential prevalence of mastitis in Holstein and Jersey cows remains unknown. The objective of the current study was to evaluate several parameters of the innate immune response of Holstein and Jersey cows to intramammary infection withStaphylococcus aureus, a common mastitis-inducing pathogen. To control for non-breed related factors that could influence these parameters, all cows were of the same parity, in similar stages of milk production, housed and managed under identical conditions, and experimentally infected and sampled in parallel. The following parameters of the innate immune response were evaluated: acute phase protein synthesis of serum amyloid A and lipopolysaccharide-binding protein; total and differential circulating white blood cell counts; milk somatic cell counts; mammary vascular permeability; milk N-acetyl-beta-d-glucosaminidase (NAGase) activity; and production of the cytokines, interferon (IFN)-γ, interleukin (IL)-12, tumour growth factor(TGF)-α, and TGF-β1. The temporal response of all of these parameters following infection was similar between Holstein and Jersey cows. Further, with the exception of changes in circulating neutrophils and NAGase activity, the overall magnitude of these parameters were also comparable. Together, these data demonstrate that the innate immune response of Holstein and Jersey cows toStaph. aureusintramammary infection remains highly conserved despite previously reported differences in mastitis prevalence, as well as genotypic and phenotypic traits, that exist between the two breeds.
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Wissinger EL, Saldana J, Didierlaurent A, Hussell T. Manipulation of acute inflammatory lung disease. Mucosal Immunol 2008; 1:265-78. [PMID: 19079188 PMCID: PMC7100270 DOI: 10.1038/mi.2008.16] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Accepted: 02/26/2008] [Indexed: 02/04/2023]
Abstract
Inflammatory lung disease to innocuous antigens or infectious pathogens is a common occurrence and in some cases, life threatening. Often, the inflammatory infiltrate that accompanies these events contributes to pathology by deleterious effects on otherwise healthy tissue and by compromising lung function by consolidating (blocking) the airspaces. A fine balance, therefore, exists between a lung immune response and immune-mediated damage, and in some the "threshold of ignorance" may be set too low. In most cases, the contributing, potentially offending, cell population or immune pathway is known, as are factors that regulate them. Why then are targeted therapeutic strategies to manipulate them not more commonplace in clinical medicine? This review highlights immune homeostasis in the lung, how and why this is lost during acute lung infection, and strategies showing promise as future immune therapeutics.
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Affiliation(s)
- E L Wissinger
- Imperial College London, Kennedy Institute of Rheumatology, London, UK
| | - J Saldana
- Imperial College London, Kennedy Institute of Rheumatology, London, UK
| | - A Didierlaurent
- Imperial College London, Kennedy Institute of Rheumatology, London, UK
- Present Address: Present address: GlaxoSmithKline Biologicals, Rue de l'Institut 89, Rixensart B-1330, Belgium,
| | - T Hussell
- Imperial College London, Kennedy Institute of Rheumatology, London, UK
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Didierlaurent A, Goulding J, Hussell T. The impact of successive infections on the lung microenvironment. Immunology 2007; 122:457-65. [PMID: 17991012 PMCID: PMC2266032 DOI: 10.1111/j.1365-2567.2007.02729.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2007] [Revised: 08/17/2007] [Accepted: 09/03/2007] [Indexed: 12/30/2022] Open
Abstract
The effect of infection history on the immune response is ignored in most models of infectious disease and in preclinical vaccination studies. No one, however, is naive and repeated microbial exposure, in particular during childhood, shapes the immune system to respond more efficiently later in life. Concurrent or sequential infections influence the immune response to secondary unrelated pathogens. The involvement of cross-reactive acquired immunity, in particular T-cell responses, is extensively documented. In this review, we discuss the impact of successive infections on the infected tissue itself, with a particular focus on the innate response of the respiratory tract, including a persistent alteration of (1) epithelial or macrophage expression of Toll-like receptors or adherence molecules used by subsequent bacteria to invade the host, (2) the responsiveness of macrophages and neutrophils and (3) the local cytokine milieu that affects the activation of local antigen-presenting cells and hence adaptive immunity to the next infection. We emphasize that such alterations not only occur during coinfection, but are maintained long after the initial pathogen is cleared. As innate responses are crucial to the fight against local pathogens but are also involved in the maintenance of the homeostasis of mucosal tissues, dysregulation of these responses by repeated infections is likely to have a major impact on the outcome of infectious or allergic disease.
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25
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Bosio CM, Bielefeldt-Ohmann H, Belisle JT. Active suppression of the pulmonary immune response by Francisella tularensis Schu4. THE JOURNAL OF IMMUNOLOGY 2007; 178:4538-47. [PMID: 17372012 DOI: 10.4049/jimmunol.178.7.4538] [Citation(s) in RCA: 164] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Francisella tularensis is an obligate, intracellular bacterium that causes acute, lethal disease following inhalation. As an intracellular pathogen F. tularensis must invade cells, replicate, and disseminate while evading host immune responses. The mechanisms by which virulent type A strains of Francisella tularensis accomplish this evasion are not understood. Francisella tularensis has been shown to target multiple cell types in the lung following aerosol infection, including dendritic cells (DC) and macrophages. We demonstrate here that one mechanism used by a virulent type A strain of F. tularensis (Schu4) to evade early detection is by the induction of overwhelming immunosuppression at the site of infection, the lung. Following infection and replication in multiple pulmonary cell types, Schu4 failed to induce the production of proinflammatory cytokines or increase the expression of MHCII or CD86 on the surface of resident DC within the first few days of disease. However, Schu4 did induce early and transient production of TGF-beta, a potent immunosuppressive cytokine. The absence of DC activation following infection could not be attributed to the apoptosis of pulmonary cells, because there were minimal differences in either annexin or cleaved caspase-3 staining in infected mice compared with that in uninfected controls. Rather, we demonstrate that Schu4 actively suppressed in vivo responses to secondary stimuli (LPS), e.g., failure to recruit granulocytes/monocytes and stimulate resident DC. Thus, unlike attenuated strains of F. tularensis, Schu4 induced broad immunosuppression within the first few days after aerosol infection. This difference may explain the increased virulence of type A strains compared with their more attenuated counterparts.
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Affiliation(s)
- Catharine M Bosio
- Department of Microbiology, Immunology and Pathology, Colorado State University, Ft. Collins, CO 80523, USA.
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26
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Ge R, Rajeev V, Ray P, Lattime E, Rittling S, Medicherla S, Protter A, Murphy A, Chakravarty J, Dugar S, Schreiner G, Barnard N, Reiss M. Inhibition of growth and metastasis of mouse mammary carcinoma by selective inhibitor of transforming growth factor-beta type I receptor kinase in vivo. Clin Cancer Res 2007; 12:4315-30. [PMID: 16857807 DOI: 10.1158/1078-0432.ccr-06-0162] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Transforming growth factor-beta (TGF-beta) suppresses tumor development by inhibiting cellular proliferation, inducing differentiation and apoptosis, and maintaining genomic integrity. However, once tumor cells escape from the tumor-suppressive effects of TGF-beta, they often constitutively overexpress and activate TGF-beta, which may promote tumor progression by enhancing invasion, metastasis, and angiogenesis and by suppressing antitumor immunity. The purpose of this study was to test this hypothesis using TGF-beta pathway antagonists. EXPERIMENTAL DESIGN We examined the effects of selective TGF-beta type I receptor kinase inhibitors, SD-093 and SD-208, on two murine mammary carcinoma cell lines (R3T and 4T1) in vitro and in vivo. RESULTS Both agents blocked TGF-beta-induced phosphorylation of the receptor-associated Smads, Smad2 and Smad3, in a dose-dependent manner, with IC50 between 20 and 80 nmol/L. TGF-beta failed to inhibit growth of these cell lines but stimulated epithelial-to-mesenchymal transdifferentiation, migration, and invasiveness into Matrigel in vitro. These effects were inhibited by SD-093, indicating that these processes are partly driven by TGF-beta. Treatment of syngeneic R3T or 4T1 tumor-bearing mice with orally given SD-208 inhibited primary tumor growth as well as the number and size of metastases. In contrast, SD-208 failed to inhibit R3T tumor growth or metastasis in athymic nude mice. Moreover, in vitro anti-4T1 cell cytotoxic T-cell responses of splenocytes from drug-treated animals were enhanced compared with cells from control animals. In addition, SD-208 treatment resulted in a decrease in tumor angiogenesis. CONCLUSION TGF-beta type I receptor kinase inhibitors hold promise as novel therapeutic agents for metastatic breast cancer.
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Affiliation(s)
- Rongrong Ge
- Department of Internal Medicine, The Cancer Institute of New Jersey, New Jersey 08903, USA
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27
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Horwitz MS, Knudsen M, Ilic A, Fine C, Sarvetnick N. Transforming Growth Factor-βInhibits Coxsackievirus-Mediated Autoimmune Myocarditis. Viral Immunol 2006; 19:722-33. [PMID: 17201667 DOI: 10.1089/vim.2006.19.722] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Clinical myocarditis is a precursor to dilated cardiomyopathy and a principal cause of heart failure. Nearly 30% of all recently diagnosed cases of myocarditis are attributable to infection with coxsackie B virus (CBV), the most frequently associated pathogen. CBV initially replicates in the pancreas and quickly spreads to the heart, inducing chronic autoimmunity. To determine whether immunosuppressive cytokines could act to limit the extent of autoimmunity to the heart, we infected transgenic mice that express immunosuppressive cytokines in the pancreas. Herein, we demonstrate that transgenic expression of transforming growth factor-beta (1) (TGF-beta) within the pancreatic beta cells prevented mice from developing autoimmune myocarditis after CBV infection. In contrast, transgenic expression of interleukin-4 did not inhibit virus-mediated heart disease. Furthermore, we show that TGF-beta expression reduced viral replication while promoting the recruitment of macrophages into the pancreas. These results illustrate the benefit of TGF-beta in controlling not only viral replication, but also CBV-mediated autoimmunity.
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Affiliation(s)
- Marc S Horwitz
- Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada.
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28
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Bannerman DD, Paape MJ, Chockalingam A. Staphylococcus aureus intramammary infection elicits increased production of transforming growth factor-α, β1, and β2. Vet Immunol Immunopathol 2006; 112:309-15. [PMID: 16750272 DOI: 10.1016/j.vetimm.2006.03.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Accepted: 03/29/2006] [Indexed: 02/04/2023]
Abstract
In contrast to other mastitis pathogens, the host response evoked during Staphylococcus aureus intramammary infection is marked by the absence of the induction of critical cytokines, including IL-8 and TNF-alpha, which have established roles in mediating host innate immunity. The elucidation of changes in the expression of other mediators with the potential to regulate mammary inflammatory responses to S. aureus remains lacking. Transforming growth factor (TGF)-alpha, TGF-beta1, and TGF-beta2 are cytokines that regulate mammary gland development. Because these cytokines also have a demonstrated role in mediating inflammation, the objective of the current study was to determine whether S. aureus intramammary infection influences their expression. Ten cows were challenged with S. aureus and milk samples collected. Increases in milk levels of TGF-alpha were evident within 32h of infection and persisted for 16h. Increases in TGF-beta1 and TGF-beta2 levels were detected within 40h of S. aureus infection and persisted through the end of the study. Thus, in contrast to IL-8 and TNF-alpha, S. aureus elicits host production of TGF-alpha, TGF-beta1, and TGF-beta2. This finding may suggest a role for these cytokines in mediating mammary gland host innate immune responses to S. aureus.
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Affiliation(s)
- Douglas D Bannerman
- Bovine Functional Genomics Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705, USA.
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29
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Abstract
Cryptococcosis is a relatively common fungal disease caused by Cryptococcus neoformans that has high morbidity and mortality. Numerous studies have established the feasibility of enhancing host immunity to C neoformans in naive immunocompetent animal models by vaccination. Several antigens have been identified that appear to be suitable vaccine candidates. Induced immune responses can mediate protection through both humoral and cellular immunity. Hence, a vaccine against cryptococcosis in humans is probably feasible but there are significant obstacles to vaccine development that range from uncertainties about the pathogenesis of infection to economic considerations.
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Affiliation(s)
- Arturo Casadevall
- Division of Infectious Diseases of the Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
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30
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Bosio CM, Dow SW. Francisella tularensis induces aberrant activation of pulmonary dendritic cells. THE JOURNAL OF IMMUNOLOGY 2006; 175:6792-801. [PMID: 16272336 DOI: 10.4049/jimmunol.175.10.6792] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Francisella tularensis is an obligate intracellular bacterium that induces severe, acute, often fatal disease when acquired by the respiratory route. Despite the seriousness of this pathogen, very little is understood about its interaction with key target cells in the airways and lungs (alveolar macrophages and airway dendritic cells (DC)) after inhalation. In this study we demonstrate replication of F. tularensis in primary DC. Early after infection, F. tularensis induced increased expression of MHC class II and CD86 on DC, but not macrophages. This was followed by depletion of DC from the airways and lungs. Despite logarithmic replication and phenotypic maturation of DC, F. tularensis failed to induce production of several key proinflammatory cytokines, including TNF-alpha and IL-6, from DC. However, F. tularensis infection did elicit production of the potent immunosuppressive cytokine, TGF-beta. Furthermore, F. tularensis actively suppressed the ability of DC to secrete cytokines in response to specific TLR agonists. Finally, we also found that infection of DC and macrophages in the lungs appears to actually increase the severity of pulmonary infection with F. tularensis. For example, depletion of airway DC and alveolar macrophages before infection resulted in significantly prolonged survival times. Together, these data suggest F. tularensis is able to selectively uncouple Ag-presenting functions from proinflammatory cytokine secretion by critical APCs in the lungs, which may serve to create a relatively immunosuppressive environment favorable to replication and dissemination of the organism.
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Affiliation(s)
- Catharine M Bosio
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, 80523, USA
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