101
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Thierry AR, Roch B. Neutrophil Extracellular Traps and By-Products Play a Key Role in COVID-19: Pathogenesis, Risk Factors, and Therapy. J Clin Med 2020; 9:E2942. [PMID: 32933031 PMCID: PMC7565044 DOI: 10.3390/jcm9092942] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 09/04/2020] [Accepted: 09/06/2020] [Indexed: 12/12/2022] Open
Abstract
Understanding of the pathogenesis of the coronavirus disease-2019 (COVID-19) remains incomplete, particularly in respect to the multi-organ dysfunction it may cause. We were the first to report the analogous biological and physiological features of COVID-19 pathogenesis and the harmful amplification loop between inflammation and tissue damage induced by the dysregulation of neutrophil extracellular traps (NETs) formation. Given the rapid evolution of this disease, the nature of its symptoms, and its potential lethality, we hypothesize that COVID-19 progresses under just such an amplifier loop, leading to a massive, uncontrolled inflammation process. Here, we describe in-depth the correlations of COVID-19 symptoms and biological features with those where uncontrolled NET formation is implicated in various sterile or infectious diseases. General clinical conditions, as well as numerous pathological and biological features, are analogous with NETs deleterious effects. Among NETs by-products implicated in COVID-19 pathogenesis, one of the most significant appears to be elastase, in accelerating virus entry and inducing hypertension, thrombosis and vasculitis. We postulate that severe acute respiratory syndrome-coronavirus 2 (SARS-CoV2) may evade innate immune response, causing uncontrolled NETs formation and multi-organ failure. In addition, we point to indicators that NETS-associated diseases are COVID-19 risk factors. Acknowledging that neutrophils are the principal origin of extracellular and circulating DNA release, we nonetheless, explain why targeting NETs rather than neutrophils themselves may in practice be a better strategy. This paper also offers an in-depth review of NET formation, function and pathogenic dysregulation, as well as of current and prospective future therapies to control NETopathies. As such, it enables us also to suggest new therapeutic strategies to fight COVID-19. In combination with or independent of the latest tested approaches, we propose the evaluation, in the short term, of treatments with DNase-1, with the anti-diabetic Metformin, or with drugs targeting elastase (i.e., Silvelestat). With a longer perspective, we also advocate a significant increase in research on the development of toll-like receptors (TLR) and C-type lectin-like receptors (CLEC) inhibitors, NET-inhibitory peptides, and on anti-IL-26 therapies.
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Affiliation(s)
- Alain R. Thierry
- Research Institute of Cancerology of Montpellier, INSERM U1194, IRCM, ICM, Montpellier University, F-34298 Montpellier, France
| | - Benoit Roch
- Respiratory Medicine, University Hospital of Montpellier, Montpellier University, F-34298 Montpellier, France;
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102
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Ma R, Ortiz Serrano TP, Davis J, Prigge AD, Ridge KM. The cGAS-STING pathway: The role of self-DNA sensing in inflammatory lung disease. FASEB J 2020; 34:13156-13170. [PMID: 32860267 PMCID: PMC8121456 DOI: 10.1096/fj.202001607r] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/31/2020] [Accepted: 08/05/2020] [Indexed: 12/15/2022]
Abstract
The presence of DNA in the cytosol is usually a sign of microbial infections, which alerts the host innate immune system to mount a defense response. Cyclic GMP-AMP synthase (cGAS) is a critical cytosolic DNA sensor that elicits robust innate immune responses through the production of the second messenger, cyclic GMP-AMP (cGAMP), which binds and activates stimulator of interferon genes (STING). However, cGAS binds to DNA irrespective of DNA sequence, therefore, self-DNA leaked from the nucleus or mitochondria can also serve as a cGAS ligand to activate this pathway and trigger extensive inflammatory responses. Dysregulation of the cGAS-STING pathway is responsible for a broad array of inflammatory and autoimmune diseases. Recently, evidence has shown that self-DNA release and cGAS-STING pathway over-activation can drive lung disease, making this pathway a promising therapeutic target for inflammatory lung disease. Here, we review recent advances on the cGAS-STING pathway governing self-DNA sensing, highlighting its role in pulmonary disease.
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Affiliation(s)
- Ruihua Ma
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Tatiana P Ortiz Serrano
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Jennifer Davis
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Andrew D Prigge
- Division of Critical Care Medicine, Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.,Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA
| | - Karen M Ridge
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.,Department of Cell and Developmental Biology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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103
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Auguste M, Balbi T, Ciacci C, Canesi L. Conservation of Cell Communication Systems in Invertebrate Host-Defence Mechanisms: Possible Role in Immunity and Disease. BIOLOGY 2020; 9:E234. [PMID: 32824821 PMCID: PMC7464772 DOI: 10.3390/biology9080234] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/16/2020] [Accepted: 08/17/2020] [Indexed: 12/14/2022]
Abstract
Innate immunity is continuously revealing multiple and highly conserved host-defence mechanisms. Studies on mammalian immunocytes are showing different communication systems that may play a role in coordinating innate immune responses also in invertebrates. Extracellular traps (ETs) are an immune response by which cells release net-like material, including DNA, histones and proteins. ETs are thought to immobilise and kill microorganisms, but are also involved in inflammation and autoimmune disease. Immune cells are also known to communicate through extracellular vesicles secreted in the extracellular environment or exosomes, which can carry a variety of different signalling molecules. Tunnelling nanotubes (TNTs) represent a direct cell-to-cell communication over a long distance, that allow for bi- or uni-directional transfer of cellular components between cells. Their functional role in a number of physio-pathological processes, including immune responses and pathogen transfer, has been underlined. Although ETs, exosomes, and TNTs have been described in invertebrate species, their possible role in immune responses is not fully understood. In this work, available data on these communication systems are summarised, in an attempt to provide basic information for further studies on their relevance in invertebrate immunity and disease.
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Affiliation(s)
- Manon Auguste
- Department of Earth Environment and Life Sciences (DISTAV), University of Genoa, 16136 Genoa, Italy; (M.A.); (T.B.)
| | - Teresa Balbi
- Department of Earth Environment and Life Sciences (DISTAV), University of Genoa, 16136 Genoa, Italy; (M.A.); (T.B.)
| | - Caterina Ciacci
- Department of Biomolecular Sciences (DIBS), University “Carlo Bo” of Urbino, 61029 Urbino, Italy;
| | - Laura Canesi
- Department of Earth Environment and Life Sciences (DISTAV), University of Genoa, 16136 Genoa, Italy; (M.A.); (T.B.)
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104
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Thierry AR. Host/genetic factors associated with COVID-19 call for precision medicine. PRECISION CLINICAL MEDICINE 2020; 3:228-234. [PMID: 35960669 PMCID: PMC7454858 DOI: 10.1093/pcmedi/pbaa026] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/12/2020] [Accepted: 07/14/2020] [Indexed: 01/08/2023] Open
Abstract
If the current rate of infection are to be better managed, and future waves of infection kept at bay, it is absolutely necessary that the conditions and mechanisms of exposure to Severe Acute Respiratory Syndrome-Coronavirus 2 (SARS-CoV-2) be better understood, as well as the downstream severe or lethal clinical complications. While the identification of notable comorbidities has now helped to define broad risk groups, the idiosyncratic responses of individual patients can generate unexpected clinical deterioration that is difficult to predict from initial clinical features. Thus, physicians caring for patients with COVID-19 face clinical dilemmas on a daily basis. The ability to decipher individual predispositions to SARS-CoV-2 infection or severe illness, in light of variations in host immunological and inflammatory responses, in particular as a result of genetic variations, would be of great benefit in infection management. To this end, this work associates the description of COVID-19 clinical complications, comorbidities, sequelae, and environmental and genetic factors. We also give examples of underlying genomic susceptibility to COVID-19, especially with regard to the newly reported link between the disease and the unbalanced formation of neutrophil extracellular traps. As a consequence, we propose that the host/genetic factors associated with COVID-19 call for precision medicine in its treatment. This is to our knowledge the first article describing elements towards precision medicine for patients with COVID-19.
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Affiliation(s)
- Alain R Thierry
- Research Institute of Cancerology of Montpellier, INSERM U1194, IRCM, ICM, Montpellier University, Montpellier F-34298, France
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105
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Haider P, Kral-Pointner JB, Mayer J, Richter M, Kaun C, Brostjan C, Eilenberg W, Fischer MB, Speidl WS, Hengstenberg C, Huber K, Wojta J, Hohensinner P. Neutrophil Extracellular Trap Degradation by Differently Polarized Macrophage Subsets. Arterioscler Thromb Vasc Biol 2020; 40:2265-2278. [PMID: 32673525 PMCID: PMC7447175 DOI: 10.1161/atvbaha.120.314883] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Supplemental Digital Content is available in the text. Macrophages are immune cells, capable to remodel the extracellular matrix, which can harbor extracellular DNA incorporated into neutrophil extracellular traps (NETs). To study the breakdown of NETs we studied the capability of macrophage subsets to degrade these structures in vitro and in vivo in a murine thrombosis model. Furthermore, we analyzed human abdominal aortic aneurysm samples in support of our in vitro and in vivo results.
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Affiliation(s)
- Patrick Haider
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Julia B Kral-Pointner
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria.,Ludwig Boltzmann Institute for Cardiovascular Research, Austria (J.B.K.-P., J.W.)
| | - Julia Mayer
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Manuela Richter
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Christoph Kaun
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Christine Brostjan
- Division of Vascular Surgery and Surgical Research Laboratories, Department of Surgery (C.B., W.E.), Medical University of Vienna, Austria
| | - Wolf Eilenberg
- Division of Vascular Surgery and Surgical Research Laboratories, Department of Surgery (C.B., W.E.), Medical University of Vienna, Austria
| | - Michael B Fischer
- Department of Blood Group Serology and Transfusion Medicine (M.B.F.), Medical University of Vienna, Austria.,Department of Biomedical Research, Danube University Krems, Austria (M.B.F.)
| | - Walter S Speidl
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Christian Hengstenberg
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Kurt Huber
- Wilhelminenhospital, 3rd Department of Medicine, Cardiology and Intensive Care Medicine, Vienna, Austria (K.H.).,Sigmund Freud University, Medical Faculty, Vienna, Austria (K.H.)
| | - Johann Wojta
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria.,Ludwig Boltzmann Institute for Cardiovascular Research, Austria (J.B.K.-P., J.W.).,Medical University of Vienna, Core Facilities, Austria (J.W.)
| | - Philipp Hohensinner
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
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106
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Neutrophils as Main Players of Immune Response Towards Nondegradable Nanoparticles. NANOMATERIALS 2020; 10:nano10071273. [PMID: 32610567 PMCID: PMC7408411 DOI: 10.3390/nano10071273] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 06/25/2020] [Accepted: 06/25/2020] [Indexed: 12/12/2022]
Abstract
Many nano/microparticles (n/µP), to which our body is exposed, have no physiological way of removal. Our immune system sense these “small particulate objects”, and tries to decrease their harmfulness. Since oxidation, phagocytosis and other methods of degradation do not work with small, chemically resistant, and hydrophobic nanoparticles (nP). This applies to soot from air pollution, nano-diamonds from cosmic impact, polishing and related machines, synthetic polymers, and dietary n/µP. Our body tries to separate these from the surrounding tissue using aggregates from neutrophil extracellular traps (NETs). This effectively works in soft tissues where n/µP are entrapped into granuloma-like structures and isolated. The interactions of hydrophobic nanocrystals with circulating or ductal patrolling neutrophils and the consequent formation of occlusive aggregated NETs (aggNETs) are prone to obstruct capillaries, bile ducts in gallbladder and liver, and many more tubular structures. This may cause serious health problems and often fatality. Here we describe how specific size and surface properties of n/µP can activate neutrophils and lead to aggregation-related pathologies. We discuss “natural” sources of n/µP and those tightly connected to unhealthy diets.
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107
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Billing AM, Knudsen KB, Chetwynd AJ, Ellis LJA, Tang SVY, Berthing T, Wallin H, Lynch I, Vogel U, Kjeldsen F. Fast and Robust Proteome Screening Platform Identifies Neutrophil Extracellular Trap Formation in the Lung in Response to Cobalt Ferrite Nanoparticles. ACS NANO 2020; 14:4096-4110. [PMID: 32167280 PMCID: PMC7498156 DOI: 10.1021/acsnano.9b08818] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 03/13/2020] [Indexed: 05/28/2023]
Abstract
Despite broad application of magnetic nanoparticles in biomedicine and electronics, only a few in vivo studies on biocompatibility are available. In this study, toxicity of magnetic metal oxide nanoparticles on the respiratory system was examined in vivo by single intratracheal instillation in mice. Bronchoalveolar lavage fluid (BALF) samples were collected for proteome analyses by LC-MS/MS, testing Fe3O4 nanoparticles doped with increasing amounts of cobalt (Fe3O4, CoFe2O4 with an iron to cobalt ratio 5:1, 3:1, 1:3, Co3O4) at two doses (54 μg, 162 μg per animal) and two time points (day 1 and 3 days postinstillation). In discovery phase, in-depth proteome profiling of a few representative samples allowed for comprehensive pathway analyses. Clustering of the 681 differentially expressed proteins (FDR < 0.05) revealed general as well as metal oxide specific responses with an overall strong induction of innate immunity and activation of the complement system. The highest expression increase could be found for a cluster of 39 proteins, which displayed strong dose-dependency to iron oxide and can be attributed to neutrophil extracellular trap (NET) formation. In-depth proteome analysis expanded the knowledge of in vivo NET formation. During screening, all BALF samples of the study (n = 166) were measured label-free as single-injections after a short gradient (21 min) LC separation using the Evosep One system, validating the findings from the discovery and defining protein signatures which enable discrimination of lung inflammation. We demonstrate a proteomics-based toxicity screening with high sample throughput easily transferrable to other nanoparticle types. Data are available via ProteomeXchange with identifier PXD016148.
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Affiliation(s)
- Anja M. Billing
- Department
of Biochemistry and Molecular Biology, University
of Southern Denmark, Odense 5230, Denmark
| | - Kristina B. Knudsen
- National
Research Centre for the Working Environment, Copenhagen 2100, Denmark
| | - Andrew J. Chetwynd
- School
of Geography Earth and Environmental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Laura-Jayne A. Ellis
- School
of Geography Earth and Environmental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | | | - Trine Berthing
- National
Research Centre for the Working Environment, Copenhagen 2100, Denmark
| | - Håkan Wallin
- National
Research Centre for the Working Environment, Copenhagen 2100, Denmark
| | - Iseult Lynch
- School
of Geography Earth and Environmental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Ulla Vogel
- National
Research Centre for the Working Environment, Copenhagen 2100, Denmark
- Department
of Health Technology, Technical University
of Denmark, Lyngby 2800, Denmark
| | - Frank Kjeldsen
- Department
of Biochemistry and Molecular Biology, University
of Southern Denmark, Odense 5230, Denmark
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108
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Kipen HM, Laskin DL. NETs: a new biomarker of traffic-related air pollution exposure: are they ready to catch fish? Eur Respir J 2020; 55:55/4/2000305. [PMID: 32245775 DOI: 10.1183/13993003.00305-2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 03/13/2020] [Indexed: 02/04/2023]
Affiliation(s)
- Howard M Kipen
- Dept of Environmental and Occupational Health, Rutgers University, School of Public Health, Piscataway, NJ, USA .,Environmental and Occupational Health Sciences Institute (EOHSI), Piscataway, NJ, USA
| | - Debra L Laskin
- Environmental and Occupational Health Sciences Institute (EOHSI), Piscataway, NJ, USA.,Dept of Pharmacology and Toxicology, Rutgers University, Ernest Mario School of Pharmacy, Piscataway, NJ, USA
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109
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Fagerhol MK, Johnson E, Tangen JM, Hollan I, Mirlashari MR, Nissen-Meyer LSH, Hetland G. NETs analysed by novel calprotectin-based assays in blood donors and patients with multiple myeloma or rheumatoid arthritis: A pilot study. Scand J Immunol 2020; 91:e12870. [PMID: 32034957 DOI: 10.1111/sji.12870] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 01/15/2020] [Accepted: 02/04/2020] [Indexed: 11/27/2022]
Abstract
Two novel enzyme-linked immunosorbent assays (ELISAs), designed to detect complexes containing DNA, leucocyte calprotectin and S100A12 proteins, were generated for improved specificity and rapid measurement of neutrophil extracellular traps (NETs). The assays were applied on plasma and serum samples from blood donors for establishment of reference values, and from patients with multiple myeloma (MM) or rheumatoid arthritis (RA) in order to examine putatively increased values in the two different inflammatory conditions. Although NETs were hardly detectable in healthy individuals, NET levels were as expected highly and statistically significantly increased in RA patients. The detection of statistically significantly increased NET levels in MM is a novel finding.
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Affiliation(s)
| | - Egil Johnson
- Department of Gastroenterological and Pediatric Surgery, OUH, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | | | - Ivana Hollan
- Lillehammer Hospital for Rheumatic Diseases, Lillehammer, Norway.,Department of Medicine, Brigham and Women's Hospital, Boston, USA
| | | | | | - Geir Hetland
- Department of Immunology and Transfusion Medicine, Oslo University Hospital (OUH), Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
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110
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The double-edged role of neutrophil extracellular traps in inflammation. Biochem Soc Trans 2020; 47:1921-1930. [PMID: 31754705 DOI: 10.1042/bst20190629] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 10/31/2019] [Accepted: 11/01/2019] [Indexed: 02/06/2023]
Abstract
While there are numerous studies showing that neutrophil extracellular traps (NETs) contribute to autoimmune inflammation and cause bystander tissue injury, human individuals with genetic impairments in NET formation curiously often suffer from exacerbated autoimmune diseases and/or chronic inflammatory conditions. These findings are confirmed in some mouse models of systemic lupus erythematosus (SLE) and gouty arthritis, where an absence of neutrophils or impairment of NET formation leads to exacerbation of autoimmunity and chronic inflammation. Thus, aside from their role as archetypical pro-inflammatory cells, neutrophils in general, and NETs in particular, can also interrupt the self-amplifying loop of cell activation and cell recruitment that characterizes neutrophilic inflammation. Here, we review the current state-of-the-science regarding anti-inflammatory and immune-regulatory action of NETs. We give an overview about the mechanistic involvement of NET-associated neutrophil serine proteases and suggest how tailored induction of NET formation could be exploited for the treatment of chronic autoinflammatory disorders.
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111
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Frasca L, Lande R. Toll-like receptors in mediating pathogenesis in systemic sclerosis. Clin Exp Immunol 2020; 201:14-24. [PMID: 32048277 DOI: 10.1111/cei.13426] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/06/2020] [Indexed: 02/06/2023] Open
Abstract
Toll-like receptors (TLRs) are evolutionarily conserved receptors essential for the host defence against pathogens. Both immune and non-immune cells can express TLRs, although at different levels. Systemic sclerosis (SSc) is a chronic disease in which autoimmunity, dysregulated profibrotic mediator release and activation of fibroblasts lead to dysregulated collagen deposition and fibrosis. There is now increasing knowledge that the innate immune system and, in particular, TLRs take a part in SSc pathogenesis. The list of endogenous ligands that can stimulate TLRs in SSc is growing: these ligands represent specific danger-associated molecular patterns (DAMPs), involved either in the initiation or the perpetuation of inflammation, and in the release of factors that sustain the fibrotic process or directly stimulate the cells that produce collagen and the endothelial cells. This review reports evidences concerning TLR signalling involvement in SSc. We report the new DAMPs, as well as the TLR-linked pathways involved in disease, with emphasis on type I interferon signature in SSc, the role of plasmacytoid dendritic cells (pDCs) and platelets. The dissection of the contribution of all these pathways to disease, and their correlation with the disease status, as well as their values as prognostic tools, can help to plan timely intervention and design new drugs for more appropriate therapeutic strategies.
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Affiliation(s)
- L Frasca
- National Centre for Drug Research and Evaluation, Pharmacological Research and Experimental Therapy Unit, Istituto Superiore di Sanità, Rome, Italy
| | - R Lande
- National Centre for Drug Research and Evaluation, Pharmacological Research and Experimental Therapy Unit, Istituto Superiore di Sanità, Rome, Italy
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112
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Neumann A, Brogden G, von Köckritz-Blickwede M. Extracellular Traps: An Ancient Weapon of Multiple Kingdoms. BIOLOGY 2020; 9:biology9020034. [PMID: 32085405 PMCID: PMC7168307 DOI: 10.3390/biology9020034] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 02/12/2020] [Accepted: 02/13/2020] [Indexed: 12/31/2022]
Abstract
The discovery, in 2004, of extracellular traps released by neutrophils has extended our understanding of the mode of action of various innate immune cells. This fascinating discovery demonstrated the extracellular trapping and killing of various pathogens by neutrophils. During the last decade, evidence has accumulated showing that extracellular traps play a crucial role in the defence mechanisms of various cell types present in vertebrates, invertebrates, and plants. The aim of this review is to summarise the relevant literature on the evolutionary history of extracellular traps used as a weapon in various kingdoms of life.
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Affiliation(s)
- Ariane Neumann
- Department of Clinical Sciences, Division of Infection Medicine, Lund University, Baravägen 27, 22184 Lund, Sweden;
| | - Graham Brogden
- Department of Physiological Chemistry, University of Veterinary Medicine Hannover, Buenteweg 17, 30559 Hannover, Germany;
| | - Maren von Köckritz-Blickwede
- Department of Physiological Chemistry, University of Veterinary Medicine Hannover, Buenteweg 17, 30559 Hannover, Germany;
- Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Bünteweg 17, 30559 Hannover, Germany
- Correspondence: ; Tel.: +49-511-953-8787
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113
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Abstract
Platelets have a well-recognized role in hemostasis and thrombosis, and they are important amplifiers of inflammation and innate immune responses. The formation of DNA extracellular traps (ETs) is a complex cellular mechanism, which occurs in response to microbial infections and sterile inflammation, and results in the release of DNA complexed with histones and various granular proteins. ETs were first discovered in neutrophils (NETs); however, it is now accepted that other leukocytes, including eosinophils (EETs) and monocytes/macrophages (MoETs/METs), can also generate them. Moreover, several types of ETs have been described.Increasing evidence has demonstrated that platelets modulate the formation of ETs. This review summarizes recent findings about the physiopathological role of platelets in the formation of ETs during infection and future perspectives in the field.
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Affiliation(s)
- Ricardo M Gómez
- Laboratorio De Virus Animales, Instituto De Biotecnología Y Biología Molecular, CONICET-UNLP, La Plata, Argentina.,Global Viral Network, Baltimore, MD, USA
| | - Aída O López Ortiz
- Laboratorio De Virus Animales, Instituto De Biotecnología Y Biología Molecular, CONICET-UNLP, La Plata, Argentina.,Laboratorio De Trombosis Experimental, Instituto De Medicina Experimental, CONICET-ANM, Buenos Aires, Argentina
| | - Mirta Schattner
- Laboratorio De Trombosis Experimental, Instituto De Medicina Experimental, CONICET-ANM, Buenos Aires, Argentina
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114
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Németh T, Sperandio M, Mócsai A. Neutrophils as emerging therapeutic targets. Nat Rev Drug Discov 2020; 19:253-275. [DOI: 10.1038/s41573-019-0054-z] [Citation(s) in RCA: 243] [Impact Index Per Article: 60.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/12/2019] [Indexed: 12/13/2022]
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115
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Mitochondrial DNA: A Key Regulator of Anti-Microbial Innate Immunity. Genes (Basel) 2020; 11:genes11010086. [PMID: 31940818 PMCID: PMC7017290 DOI: 10.3390/genes11010086] [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: 12/15/2019] [Revised: 01/09/2020] [Accepted: 01/10/2020] [Indexed: 12/25/2022] Open
Abstract
During the last few years, mitochondrial DNA has attained much attention as a modulator of immune responses. Due to common evolutionary origin, mitochondrial DNA shares various characteristic features with DNA of bacteria, as it consists of a remarkable number of unmethylated DNA as 2′-deoxyribose cytidine-phosphate-guanosine (CpG) islands. Due to this particular feature, mitochondrial DNA seems to be recognized as a pathogen-associated molecular pattern by the innate immune system. Under the normal physiological situation, mitochondrial DNA is enclosed in the double membrane structure of mitochondria. However, upon pathological conditions, it is usually released into the cytoplasm. Growing evidence suggests that this cytosolic mitochondrial DNA induces various innate immune signaling pathways involving NLRP3, toll-like receptor 9, and stimulator of interferon genes (STING) signaling, which participate in triggering downstream cascade and stimulating to produce effector molecules. Mitochondrial DNA is responsible for inflammatory diseases after stress and cellular damage. In addition, it is also involved in the anti-viral and anti-bacterial innate immunity. Thus, instead of entire mitochondrial importance in cellular metabolism and energy production, mitochondrial DNA seems to be essential in triggering innate anti-microbial immunity. Here, we describe existing knowledge on the involvement of mitochondrial DNA in the anti-microbial immunity by modulating the various immune signaling pathways.
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Monticolo F, Palomba E, Termolino P, Chiaiese P, de Alteriis E, Mazzoleni S, Chiusano ML. The Role of DNA in the Extracellular Environment: A Focus on NETs, RETs and Biofilms. FRONTIERS IN PLANT SCIENCE 2020; 11:589837. [PMID: 33424885 PMCID: PMC7793654 DOI: 10.3389/fpls.2020.589837] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 11/25/2020] [Indexed: 05/06/2023]
Abstract
The capacity to actively release genetic material into the extracellular environment has been reported for bacteria, archaea, fungi, and in general, for microbial communities, but it is also described in the context of multicellular organisms, animals and plants. This material is often present in matrices that locate outside the cells. Extracellular matrices have important roles in defense response and disease in microbes, animal and plants cells, appearing as barrier against pathogen invasion or for their recognition. Specifically, neutrophils extracellular traps (NETs) in animals and root extracellular traps (RETs) in plants, are recognized to be important players in immunity. A growing amount of evidence revealed that the extracellular DNA, in these contexts, plays an active role in the defense action. Moreover, the protective role of extracellular DNA against antimicrobials and mechanical stress also appears to be confirmed in bacterial biofilms. In parallel, recent efforts highlighted different roles of self (homologous) and non-self (heterologous) extracellular DNA, paving the way to discussions on its role as a "Damage-associated molecular pattern" (DAMP). We here provide an evolutionary overview on extracellular DNA in extracellular matrices like RETs, NETs, and microbial biofilms, discussing on its roles and inferring on possible novel functionalities.
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Affiliation(s)
- Francesco Monticolo
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
| | - Emanuela Palomba
- Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica “Anton Dohrn”, Naples, Italy
| | - Pasquale Termolino
- Institute of Biosciences and Bioresources, National Research Council, Portici, Italy
| | - Pasquale Chiaiese
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
| | | | - Stefano Mazzoleni
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
| | - Maria Luisa Chiusano
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
- Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica “Anton Dohrn”, Naples, Italy
- *Correspondence: Maria Luisa Chiusano,
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Rao DA, Arazi A, Wofsy D, Diamond B. Design and application of single-cell RNA sequencing to study kidney immune cells in lupus nephritis. Nat Rev Nephrol 2019; 16:238-250. [PMID: 31853010 DOI: 10.1038/s41581-019-0232-6] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/13/2019] [Indexed: 11/09/2022]
Abstract
The immune mechanisms that cause tissue injury in lupus nephritis have been challenging to define. The advent of high-dimensional cellular analyses, such as single-cell RNA sequencing, has enabled detailed characterization of the cell populations present in small biopsy samples of kidney tissue. In parallel, the development of methods that cryopreserve kidney biopsy specimens in a manner that preserves intact, viable cells, has enabled the uniform analysis of tissue samples collected at multiple sites and across many geographic areas and demographic cohorts with high-dimensional platforms. The application of these methods to kidney biopsy samples from patients with lupus nephritis has begun to define the phenotypes of both infiltrating and resident immune cells, as well as parenchymal cells, present in nephritic kidneys. The detection of similar immune cell populations in urine suggests that it might be possible to non-invasively monitor immune activation in kidneys. Once applied to large patient cohorts, these high-dimensional studies might enable patient stratification according to patterns of immune cell activation in the kidney or identify disease features that can be used as surrogate measures of efficacy in clinical trials. Applied broadly across multiple inflammatory kidney diseases, these studies promise to enormously expand our understanding of renal inflammation in the next decade.
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Affiliation(s)
- Deepak A Rao
- Division of Rheumatology, Inflammation, and Immunity, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Arnon Arazi
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - David Wofsy
- Rheumatology Division and Russell/Engleman Research Center, University of California San Francisco, San Francisco, CA, USA
| | - Betty Diamond
- Center for Autoimmune, Musculoskeletal and Hematopoietic Diseases, The Feinstein Institute for Medical Research, Northwell Health, Manhasset, NY, USA.
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Loureiro A, Pais C, Sampaio P. Relevance of Macrophage Extracellular Traps in C. albicans Killing. Front Immunol 2019; 10:2767. [PMID: 31866996 PMCID: PMC6904331 DOI: 10.3389/fimmu.2019.02767] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 11/12/2019] [Indexed: 12/23/2022] Open
Abstract
Candida albicans causes systemic life-threatening infections, particularly in immunocompromised individuals, such as patients in intensive care units, patients undergoing chemotherapy, and post-surgical and neutropenic patients. The proliferation of invading Candida cells is mainly limited by the action of the human innate immune system, in which phagocytic cells play a fundamental role. This function is, however, limited in neutropenic patients, who rely mainly on the protective immunity mediated by macrophages. Macrophages have been shown to release extracellular DNA fibers, known as macrophage extracellular traps (METs), which can entrap and kill various microbes by a process called ETosis. In this study, we observed that, upon contact with C. albicans, macrophages became active in phagocyting and engulfing yeast cells. ETosis was induced in 6% of macrophages within the first 30 min of contact, and this percentage increased with the multiplicity of infection until a plateau was reached. After 2.5 h incubation, the presence of extracellular macrophage DNA was observed in approximately half of the cells. This study suggests that the formation of METs occurs before pyroptosis (first 6–8 h) and macrophage cell death (up to 24 h), and thus, METs could be included in models describing C. albicans–macrophage interactions. We also observed that macrophage ETosis and phagocytosis can occur simultaneously and that, in the first hours of infection, both processes are similarly important in controlling the proliferation of yeast cells, this being critical in neutropenic patients. Finally, it can also be concluded that, since C. albicans can degrade DNA, the structural component of METs, yeast extracellular DNase activity can be considered as an important virulence factor.
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Affiliation(s)
- Ana Loureiro
- Centre of Molecular and Environmental Biology (CBMA), Department of Biology, University of Minho, Braga, Portugal
| | - Célia Pais
- Centre of Molecular and Environmental Biology (CBMA), Department of Biology, University of Minho, Braga, Portugal
| | - Paula Sampaio
- Centre of Molecular and Environmental Biology (CBMA), Department of Biology, University of Minho, Braga, Portugal
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Granger V, Peyneau M, Chollet-Martin S, de Chaisemartin L. Neutrophil Extracellular Traps in Autoimmunity and Allergy: Immune Complexes at Work. Front Immunol 2019; 10:2824. [PMID: 31849989 PMCID: PMC6901596 DOI: 10.3389/fimmu.2019.02824] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 11/15/2019] [Indexed: 12/17/2022] Open
Abstract
Neutrophil extracellular traps (NETs) have been initially described as main actors in host defense owing to their ability to immobilize and sometimes kill microorganisms. Subsequent studies have demonstrated their implication in the pathophysiology of various diseases, due to the toxic effects of their main components on surrounding tissues. Several distinct NETosis pathways have been described in response to various triggers. Among these triggers, IgG immune complexes (IC) play an important role since they induce robust NET release upon binding to activating FcγRs on neutrophils. Few in vitro studies have documented the mechanisms of IC-induced NET release and evidence about the partners involved is controversial. In vivo, animal models and clinical studies have strongly suggested the importance of IgG IC-induced NET release for autoimmunity and anaphylaxis. In this review, we will focus on two autoimmune diseases in which NETs are undoubtedly major players, systemic lupus erythematosus (SLE), and rheumatoid arthritis (RA). We will also discuss anaphylaxis as another example of disease recently associated with IC-induced NET release. Understanding the role of IC-induced NETs in these settings will pave the way for new diagnostic tools and therapeutic strategies.
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Affiliation(s)
- Vanessa Granger
- Département d'Immunologie et d'Hématologie, UF Auto-immunité et Hypersensibilités, HUPNVS, Hôpital Bichat, Paris, France.,Inflammation Chimiokines et Immunopathologie, INSERM UMR996, Faculté de Pharmacie, Université Paris-Sud, Université Paris-Saclay, Châtenay-Malabry, France
| | - Marine Peyneau
- Département d'Immunologie et d'Hématologie, UF Auto-immunité et Hypersensibilités, HUPNVS, Hôpital Bichat, Paris, France.,Inflammation Chimiokines et Immunopathologie, INSERM UMR996, Faculté de Pharmacie, Université Paris-Sud, Université Paris-Saclay, Châtenay-Malabry, France
| | - Sylvie Chollet-Martin
- Département d'Immunologie et d'Hématologie, UF Auto-immunité et Hypersensibilités, HUPNVS, Hôpital Bichat, Paris, France.,Inflammation Chimiokines et Immunopathologie, INSERM UMR996, Faculté de Pharmacie, Université Paris-Sud, Université Paris-Saclay, Châtenay-Malabry, France
| | - Luc de Chaisemartin
- Département d'Immunologie et d'Hématologie, UF Auto-immunité et Hypersensibilités, HUPNVS, Hôpital Bichat, Paris, France.,Inflammation Chimiokines et Immunopathologie, INSERM UMR996, Faculté de Pharmacie, Université Paris-Sud, Université Paris-Saclay, Châtenay-Malabry, France
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