1
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Ma X, Li J, Li M, Qi G, Wei L, Zhang D. Nets in fibrosis: Bridging innate immunity and tissue remodeling. Int Immunopharmacol 2024; 137:112516. [PMID: 38906006 DOI: 10.1016/j.intimp.2024.112516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 06/10/2024] [Accepted: 06/16/2024] [Indexed: 06/23/2024]
Abstract
Fibrosis, a complex pathological process characterized by excessive deposition of extracellular matrix components, leads to tissue scarring and dysfunction. Emerging evidence suggests that neutrophil extracellular traps (NETs), composed of DNA, histones, and antimicrobial proteins, significantly contribute to fibrotic diseases pathogenesis. This review summarizes the process of NETs production, molecular mechanisms, and related diseases, and outlines the cellular and molecular mechanisms associated with fibrosis. Subsequently, this review comprehensively summarizes the current understanding of the intricate interplay between NETs and fibrosis across various organs, including the lung, liver, kidney, skin, and heart. The mechanisms by which NETs contribute to fibrogenesis, including their ability to promote inflammation, induce epithelial-mesenchymal transition (EMT), activate fibroblasts, deposit extracellular matrix (ECM) components, and trigger TLR4 signaling were explored. This review aimed to provide insights into the complex relationship between NETs and fibrosis via a comprehensive analysis of existing reports, offering novel perspectives for future research and therapeutic interventions.
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Affiliation(s)
- Xueni Ma
- Key Laboratory of Digestive Diseases, Lanzhou University Second Hospital, Lanzhou, China; The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Jipin Li
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Muyang Li
- Key Laboratory of Digestive Diseases, Lanzhou University Second Hospital, Lanzhou, China; The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Guoqing Qi
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, China
| | - Lina Wei
- Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, China
| | - Dekui Zhang
- Key Laboratory of Digestive Diseases, Lanzhou University Second Hospital, Lanzhou, China; Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, China.
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2
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Marques E, Kramer R, Ryan DG. Multifaceted mitochondria in innate immunity. NPJ METABOLIC HEALTH AND DISEASE 2024; 2:6. [PMID: 38812744 PMCID: PMC11129950 DOI: 10.1038/s44324-024-00008-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 04/14/2024] [Indexed: 05/31/2024]
Abstract
The ability of mitochondria to transform the energy we obtain from food into cell phosphorylation potential has long been appreciated. However, recent decades have seen an evolution in our understanding of mitochondria, highlighting their significance as key signal-transducing organelles with essential roles in immunity that extend beyond their bioenergetic function. Importantly, mitochondria retain bacterial motifs as a remnant of their endosymbiotic origin that are recognised by innate immune cells to trigger inflammation and participate in anti-microbial defence. This review aims to explore how mitochondrial physiology, spanning from oxidative phosphorylation (OxPhos) to signalling of mitochondrial nucleic acids, metabolites, and lipids, influences the effector functions of phagocytes. These myriad effector functions include macrophage polarisation, efferocytosis, anti-bactericidal activity, antigen presentation, immune signalling, and cytokine regulation. Strict regulation of these processes is critical for organismal homeostasis that when disrupted may cause injury or contribute to disease. Thus, the expanding body of literature, which continues to highlight the central role of mitochondria in the innate immune system, may provide insights for the development of the next generation of therapies for inflammatory diseases.
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Affiliation(s)
- Eloïse Marques
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK
| | - Robbin Kramer
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK
| | - Dylan G. Ryan
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK
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3
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Yin K, Wang D, Zhang Y, Lu H, Hou L, Guo T, Zhao H, Xing M. Polystyrene microplastics promote liver inflammation by inducing the formation of macrophages extracellular traps. JOURNAL OF HAZARDOUS MATERIALS 2023; 452:131236. [PMID: 36958159 DOI: 10.1016/j.jhazmat.2023.131236] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 03/15/2023] [Accepted: 03/16/2023] [Indexed: 05/03/2023]
Abstract
Microplastics (MPs), a new and increasing environmental pollutant, can cause ongoing damage to organisms. Although recent studies have revealed mechanisms of action for some of the hepatotoxicity caused by MPs, the role-played by cellular interactions, particularly immune cells, in the process of liver injury has not been elucidated. In the present study, 5-μm polystyrene microplastics (PS-MPs) induced liver inflammation as well as the formation of Macrophage extracellular traps (METs). Macrophage and LMH cell co-culture systems confirmed that PS-MPs-induced METs promote inflammation in hepatocytes. Mechanistically, macrophages actively phagocytose particles after 4 h of exposure to PS-MPs. Subsequently PS-MPs elevated ROS levels and disrupt mitochondrial kinetic homeostasis. Further activation of mitochondrial autophagy and lysosomes. After phagocytosis of PS-MPs by macrophages for 12 h, continued autophagy and lysosome activation eventually lead to lysosome rupture and release of calcium ions to induce the formation of METs. Blocking ROS (NAC) and autophagy (3MA) partially alleviated mitochondrial and lysosomal damage and thus inhibited the formation of METs induced by PS-MPs. NAC also delayed the onset of respiratory burst to alleviate METs formation. In conclusion, our study reveals the mechanism of METs formation in liver inflammation induced by PS-MPs exposure and suggests that lysosomal damage may be one of the key players in the formation of METs induced by PS-MPs.
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Affiliation(s)
- Kai Yin
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China
| | - Dongxu Wang
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China
| | - Yue Zhang
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China
| | - Hongmin Lu
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China
| | - Lulu Hou
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China
| | - Tiantian Guo
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China
| | - Hongjing Zhao
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China.
| | - Mingwei Xing
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, Heilongjiang, PR China.
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4
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Kim JY, Jeon K, Hong JJ, Park SI, Cho H, Park HJ, Kwak HW, Park HJ, Bang YJ, Lee YS, Bae SH, Kim SH, Hwang KA, Jung DI, Cho SH, Seo SH, Kim G, Oh H, Lee HY, Kim KH, Lim HY, Jeon P, Lee JY, Chung J, Lee SM, Ko HL, Song M, Cho NH, Lee YS, Hong SH, Nam JH. Heterologous vaccination utilizing viral vector and protein platforms confers complete protection against SFTSV. Sci Rep 2023; 13:8189. [PMID: 37210393 DOI: 10.1038/s41598-023-35328-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 05/16/2023] [Indexed: 05/22/2023] Open
Abstract
Severe fever with thrombocytopenia syndrome virus was first discovered in 2009 as the causative agent of severe fever with thrombocytopenia syndrome. Despite its potential threat to public health, no prophylactic vaccine is yet available. This study developed a heterologous prime-boost strategy comprising priming with recombinant replication-deficient human adenovirus type 5 (rAd5) expressing the surface glycoprotein, Gn, and boosting with Gn protein. This vaccination regimen induced balanced Th1/Th2 immune responses and resulted in potent humoral and T cell-mediated responses in mice. It elicited high neutralizing antibody titers in both mice and non-human primates. Transcriptome analysis revealed that rAd5 and Gn proteins induced adaptive and innate immune pathways, respectively. This study provides immunological and mechanistic insight into this heterologous regimen and paves the way for future strategies against emerging infectious diseases.
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Affiliation(s)
- Jae-Yong Kim
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Kyeongseok Jeon
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Jung Joo Hong
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Sang-In Park
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Hyeonggon Cho
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Hyo-Jung Park
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
| | - Hye Won Kwak
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Hyeong-Jun Park
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Yoo-Jin Bang
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
- SML Biopharm, Gwangmyeong, Gyeonggi-do, Republic of Korea
| | - Yu-Sun Lee
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
| | - Seo-Hyeon Bae
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea
| | - So-Hee Kim
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Kyung-Ah Hwang
- Department of Research and Development, Genetree Research, Seoul, Republic of Korea
| | - Dae-Im Jung
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Seong Hoo Cho
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Sang Hwan Seo
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Green Kim
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Hanseul Oh
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Hwal-Yong Lee
- Immunology and Infectious Disease Lab, National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)/University of Science and Technology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Ki Hyun Kim
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Hee-Young Lim
- Center for Emerging Virus Research, National Institutes of Health, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea
| | - Pyeonghwa Jeon
- Center for Emerging Virus Research, National Institutes of Health, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea
| | - Joo-Yeon Lee
- Center for Emerging Virus Research, National Institutes of Health, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea
| | - Junho Chung
- Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Sang-Myeong Lee
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Hae Li Ko
- Scripps Korea Antibody Institute, Chuncheon, 24341, Republic of Korea
| | - Manki Song
- Science Unit, International Vaccine Institute, Seoul, Republic of Korea
| | - Nam-Hyuk Cho
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
| | - Young-Suk Lee
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
| | - So-Hee Hong
- Department of Microbiology, College of Medicine, Ewha Womans University, Seoul, 07804, Republic of Korea.
| | - Jae-Hwan Nam
- Department of Medical and Biological Sciences, The Catholic University of Korea, 43-1 Yeokgok-dong, Wonmi-gu, Bucheon, 14662, Republic of Korea.
- BK Plus Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, Republic of Korea.
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5
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Wu Y, Wei S, Wu X, Li Y, Han X. Neutrophil extracellular traps in acute coronary syndrome. J Inflamm (Lond) 2023; 20:17. [PMID: 37165396 PMCID: PMC10171160 DOI: 10.1186/s12950-023-00344-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 05/04/2023] [Indexed: 05/12/2023] Open
Abstract
Acute coronary syndrome (ACS) is a group of clinical syndromes caused by acute myocardial ischemia, which can cause heart failure, arrhythmia and even sudden death. It is the major cause of disability and death worldwide. Neutrophil extracellular traps (NETs) are reticular structures released by neutrophils activation and have various biological functions. NETs are closely related to the occurrence and development of ACS and also the subsequent damage after myocardial infarction. The mechanisms are complex and interdependent on various pathways, which require further exploration. This article reviewed the role and mechanism of NETs in ACS, thereby providing a valuable reference for the diagnosis and clinical treatment of ACS.
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Affiliation(s)
- Yawen Wu
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, No. 80 Cuiyingmen, Chengguan District, Lanzhou, 730030, China
- Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Shilin Wei
- Department of Thoracic Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, China
| | - Xiangyang Wu
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, No. 80 Cuiyingmen, Chengguan District, Lanzhou, 730030, China
| | - Yongnan Li
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, No. 80 Cuiyingmen, Chengguan District, Lanzhou, 730030, China.
| | - Xue Han
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, No. 80 Cuiyingmen, Chengguan District, Lanzhou, 730030, China.
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Reichinger D, Reithofer M, Hohagen M, Drinic M, Tobias J, Wiedermann U, Kleitz F, Jahn-Schmid B, Becker CFW. A Biomimetic, Silaffin R5-Based Antigen Delivery Platform. Pharmaceutics 2022; 15:pharmaceutics15010121. [PMID: 36678751 PMCID: PMC9866965 DOI: 10.3390/pharmaceutics15010121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/22/2022] [Accepted: 12/24/2022] [Indexed: 01/01/2023] Open
Abstract
Nature offers a wide range of evolutionary optimized materials that combine unique properties with intrinsic biocompatibility and that can be exploited as biomimetic materials. The R5 and RRIL peptides employed here are derived from silaffin proteins that play a crucial role in the biomineralization of marine diatom silica shells and are also able to form silica materials in vitro. Here, we demonstrate the application of biomimetic silica particles as a vaccine delivery and adjuvant platform by linking the precipitating peptides R5 and the RRIL motif to a variety of peptide antigens. The resulting antigen-loaded silica particles combine the advantages of biomaterial-based vaccines with the proven intracellular uptake of silica particles. These particles induce NETosis in human neutrophils as well as IL-6 and TNF-α secretion in murine bone marrow-derived dendritic cells.
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Affiliation(s)
- Daniela Reichinger
- Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria
- Vienna Doctoral School in Chemistry (DoSChem), University of Vienna, Währinger Str. 42, 1090 Vienna, Austria
| | - Manuel Reithofer
- Department of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
- Institute of Molecular Biotechnology, Department of Biotechnology, University of Natural Resources and Life Sciences, Gregor-Mendel-Straße 33, 1180 Vienna, Austria
| | - Mariam Hohagen
- Vienna Doctoral School in Chemistry (DoSChem), University of Vienna, Währinger Str. 42, 1090 Vienna, Austria
- Department of Inorganic Chemistry–Functional Materials, Faculty of Chemistry, University of Vienna, Währinger Str. 42, 1090 Vienna, Austria
| | - Mirjana Drinic
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria
| | - Joshua Tobias
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria
| | - Ursula Wiedermann
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria
| | - Freddy Kleitz
- Department of Inorganic Chemistry–Functional Materials, Faculty of Chemistry, University of Vienna, Währinger Str. 42, 1090 Vienna, Austria
| | - Beatrice Jahn-Schmid
- Department of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Christian F. W. Becker
- Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria
- Correspondence:
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7
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Cao Z, Zhao M, Sun H, Hu L, Chen Y, Fan Z. Roles of mitochondria in neutrophils. Front Immunol 2022; 13:934444. [PMID: 36081497 PMCID: PMC9447286 DOI: 10.3389/fimmu.2022.934444] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 07/19/2022] [Indexed: 01/25/2023] Open
Abstract
Neutrophils are the most abundant leukocyte in human blood. They are critical for fighting infections and are involved in inflammatory diseases. Mitochondria are indispensable for eukaryotic cells, as they control the biochemical processes of respiration and energy production. Mitochondria in neutrophils have been underestimated since glycolysis is a major metabolic pathway for fuel production in neutrophils. However, several studies have shown that mitochondria are greatly involved in multiple neutrophil functions as well as neutrophil-related diseases. In this review, we focus on how mitochondrial components, metabolism, and related genes regulate neutrophil functions and relevant diseases.
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Affiliation(s)
- Ziming Cao
- Department of Immunology, School of Medicine, UConn Health, Farmington, CT, United States
| | - Meng Zhao
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, United States,Department of Microbiology and Immunology, University of Oklahoma Health Science Center, Oklahoma City, OK, United States
| | - Hao Sun
- Department of Medicine, University of California San Diego, La Jolla, CA, United States
| | - Liang Hu
- Academy of Integrative Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yunfeng Chen
- Department of Biochemistry and Molecular Biology and Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States
| | - Zhichao Fan
- Department of Immunology, School of Medicine, UConn Health, Farmington, CT, United States,*Correspondence: Zhichao Fan,
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8
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Allen ER, Whitefoot-Keliin KM, Palmatier EM, Mahon AR, Greenlee-Wacker MC. Extracellular vesicles from A23187-treated neutrophils cause cGAS-STING-dependent IL-6 production by macrophages. Front Immunol 2022; 13:949451. [PMID: 35967325 PMCID: PMC9374307 DOI: 10.3389/fimmu.2022.949451] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 07/04/2022] [Indexed: 12/15/2022] Open
Abstract
In response to several types of bacteria, as well as pharmacological agents, neutrophils produce extracellular vesicles (EVs) and release DNA in the form of neutrophil extracellular traps (NETs). However, it is unknown whether these two neutrophil products cooperate to modulate inflammation. Consistent with vital NETosis, neutrophils challenged with S. aureus, as well as those treated with A23187, released significantly more DNA relative to untreated or fMLF-treated neutrophils, with no lysis occurring for any condition. To test the hypothesis that EVs generated during NETosis caused macrophage inflammation, we isolated and characterized EVs from A23187-treated neutrophils (A23187-EVs). A23187-EVs associated with neutrophil granule proteins, histone H3, transcription factor A, mitochondrial (TFAM), and nuclear and mitochondrial DNA (mtDNA). We showed that DNA from A23187-EVs, when transfected into macrophages, led to production of IL-6 and IFN-α2, and this response was blunted by pre-treatment with the STING inhibitor H151. Next, we confirmed that A23187-EVs were engulfed by macrophages, and showed that they induced cGAS-STING-dependent IL-6 production. In contrast, neither EVs from untreated or fMLF-treated cells exhibited pro-inflammatory activity. Although detergent-mediated lysis of A23187-EVs diminished IL-6 production, removal of surface-associated DNA with DNase I treatment had no effect, and A23187-EVs did not induce IFN-α2 production. Given these unexpected results, we investigated whether macrophage mtDNA activated the cGAS-STING signaling axis. Consistent with mitochondrial outer membrane permeabilization (MOMP), a defined mechanism of mtDNA release, we observed macrophage mitochondrial membrane depolarization, a decrease in cytosolic Bax, and a decrease in mitochondrial cytochrome c, suggesting that macrophage mtDNA may initiate this EV-dependent signaling cascade. All together, these data demonstrate that A23187-EVs behave differently than transfected NET- or EV-DNA, and that neutrophil-derived EVs could be used as a model to study NF-κB-dependent STING activation.
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9
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Li Q, Chi H, Shi X, Gan Q, Dalmo RA, Sun YY, Tang X, Xing J, Sheng X, Zhan W. Vaccine Adjuvants Induce Formation of Intraperitoneal Extracellular Traps in Flounder (Paralichthys olivaceus). Front Cell Infect Microbiol 2022; 12:875409. [PMID: 35433509 PMCID: PMC9005893 DOI: 10.3389/fcimb.2022.875409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 03/03/2022] [Indexed: 01/15/2023] Open
Abstract
Adjuvants are used to increase the strength, quality, and duration of the immune response of vaccines. Neutrophils are the first immune cells that arrive at the injection site and can release DNA fibers together with granular proteins, so-called neutrophil extracellular traps (NETs), to entrap microbes in a sticky matrix of extracellular chromatin and microbicidal agents. Similar extracellular structures were also released by macrophages, mast cells, and eosinophils and are now generalized as “ETs.” Here we demonstrated that Alum adjuvant stimulation led to peritoneal cells swarming and ET release in vitro. Moreover, compared to antigen stimulation alone, ET release was significantly increased after stimulation with antigen-mixed adjuvants and in a time- and dose-dependent manner. In vivo, we were able to monitor and quantify the continuous changes of the ET release in the same fish by using the small animal in vivo imaging instrument at different times during the early stages after intraperitoneal immunization. The results showed that the fluorescence signal of ETs in the peritoneum increased from 0 to 12 h after injection and then gradually decreased. The fluorescence signals came from extracellular DNA fibers, which are sensitive to DNase I and confirmed by microscopy of peritoneal fluid ex vivo. In summary, this study introduced a new method for detecting ETs in the peritoneum of fish in vivo and indicated that ET formation is involved in the immune response at the early stage after intraperitoneal immunization to vaccines.
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Affiliation(s)
- Qian Li
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
| | - Heng Chi
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
- *Correspondence: Heng Chi,
| | - Xueyan Shi
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
| | - Qiujie Gan
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
| | - Roy Ambli Dalmo
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, University of Tromsø, The Arctic University of Norway, Tromsø, Norway
| | - Yuan-yuan Sun
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
| | - Xiaoqian Tang
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Jing Xing
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Xiuzhen Sheng
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Wenbin Zhan
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, China
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
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10
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Cichon I, Ortmann W, Kolaczkowska E. Metabolic Pathways Involved in Formation of Spontaneous and Lipopolysaccharide-Induced Neutrophil Extracellular Traps (NETs) Differ in Obesity and Systemic Inflammation. Int J Mol Sci 2021; 22:ijms22147718. [PMID: 34299338 PMCID: PMC8303382 DOI: 10.3390/ijms22147718] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 07/14/2021] [Accepted: 07/15/2021] [Indexed: 02/07/2023] Open
Abstract
Obesity manifests itself with low-grade chronic inflammation that shapes immune responses during infection. Albeit obese individuals are at risk of higher mortality due to comorbidities, they are better protected from systemic inflammation. Recently, we showed that in the vasculature of obese mice kept on high-fat diet (HFD), neutrophils produce less neutrophil extracellular traps (NETs) than in lean controls (normal diet, ND). NETs are used by neutrophils to counteract severe infection, but they also cause collateral damage. Hardly anything is known about metabolic requirements for their formation, especially in the context of obesity and/or sepsis. Thus, we aimed to study the immunometabolism of NET formation by application of ex vivo neutrophil analyses (Seahorse analyzer, selective inhibitors, confocal imaging) and intravital microscopy. The obtained data show that glycolysis and/or pentose phosphate pathway are involved in NETs release by ND neutrophils in both physiological and inflammatory conditions. In contrast, such cells of septic HFD mice utilize these routes only to spontaneously cast NETs, while after secondary ex vivo activation they exhibit so called "exhausted phenotype", which manifests itself in diminished NET release despite high glycolytic potential and flexibility to oxidize fatty acids. Moreover, impact of ATP synthase inhibition on NET formation is revealed. Overall, the study shows that the neutrophil potential to cast NETs depends on both the metabolic and inflammatory state of the individual.
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Adjuvants and Vaccines Used in Allergen-Specific Immunotherapy Induce Neutrophil Extracellular Traps. Vaccines (Basel) 2021; 9:vaccines9040321. [PMID: 33915724 PMCID: PMC8066953 DOI: 10.3390/vaccines9040321] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 03/22/2021] [Accepted: 03/23/2021] [Indexed: 12/31/2022] Open
Abstract
Aluminum hydroxide (alum) and monophosphoryl-lipid A (MPLA) are conventional adjuvants in vaccines for allergen-specific immunotherapy (AIT). Alum triggers the release of neutrophil extracellular traps (NETs) by neutrophils. NETs contain expelled decondensed chromatin associated with granular material and may act as danger-associated molecular patterns and activate antigen-presenting cells. We investigated whether adjuvant-induced NETs contribute to innate responses to AIT-vaccines. Human neutrophils were incubated with alum, MPLA and adjuvant-containing AIT-vaccine preparations. NETs were verified by time-lapse and confocal fluorescence microscopy and quantitatively assessed by DNA and elastase release and ROS production. In contrast to MPLA, alum represented a potent trigger for NET release. Vaccine formulations containing alum resulted in less NET release than alum alone, whereas the vaccine containing MPLA induced stronger NET responses than MPLA alone. NETs and alum alone and synergistically increased the expression of molecules involved in antigen presentation, i.e., CD80, CD86 and CD83, by peripheral blood monocytes. Monocyte priming with NETs resulted in individually differing IL-1β- and IL-6-responses. Thus, NETs induced by adjuvants in AIT-vaccines can provide autonomous and cooperative effects on early innate responses. The high diversity of individual innate responses to adjuvants and AIT-vaccines may affect their therapeutic efficacy.
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Reithofer M, Karacs J, Strobl J, Kitzmüller C, Polak D, Seif K, Kamalov M, Becker CFW, Greiner G, Schmetterer K, Stary G, Bohle B, Jahn-Schmid B. Alum triggers infiltration of human neutrophils ex vivo and causes lysosomal destabilization and mitochondrial membrane potential-dependent NET-formation. FASEB J 2020; 34:14024-14041. [PMID: 32860638 PMCID: PMC7589265 DOI: 10.1096/fj.202001413r] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 08/12/2020] [Accepted: 08/17/2020] [Indexed: 01/30/2023]
Abstract
Aluminium salts have been used in vaccines for decades. However, the mechanisms underlying their adjuvant effect are still unclear. Neutrophils, the first immune cells at the injection site, can release cellular DNA together with granular material, so‐called neutrophil extracellular traps (NETs). In mice, NETs apparently play a role in aluminium hydroxide (alum)‐adjuvant immune response to vaccines. Although no experimental data exist, this effect is assumed to be operative also in humans. As a first step to verify this knowledge in humans, we demonstrate that the injection of alum particles into human skin biopsies ex vivo leads to similar tissue infiltration of neutrophils and NET‐formation. Moreover, we characterized the mechanism leading to alum‐induced NET‐release in human neutrophils as rapid, NADPH oxidase‐independent process involving charge, phagocytosis, phagolysosomal rupture, Ca2+‐flux, hyperpolarization of the mitochondrial membrane, and mitochondrial ROS. Extracellular flow and inhibition experiments suggested that no additional energy from oxidative phosphorylation or glycolysis is required for NET‐release. This study suggests a so far unappreciated role for neutrophils in the initial phase of immune responses to alum‐containing vaccines in humans and provides novel insights into bioenergetic requirements of NET‐formation.
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Affiliation(s)
- Manuel Reithofer
- Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Jasmine Karacs
- Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Johanna Strobl
- Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Claudia Kitzmüller
- Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Dominika Polak
- Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Katharina Seif
- Department of Surgery, Medical University of Vienna, Vienna, Austria
| | - Meder Kamalov
- Institute of Biological Chemistry, Department of Chemistry, University of Vienna, Vienna, Austria
| | - Christian F W Becker
- Institute of Biological Chemistry, Department of Chemistry, University of Vienna, Vienna, Austria
| | - Georg Greiner
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Klaus Schmetterer
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Georg Stary
- Department of Dermatology, Medical University of Vienna, Vienna, Austria.,Ludwig Boltzmann Institute for Rare and Undiagnosed Diseases, Vienna, Austria.,CeMM Research Center for Molecular Medicine, Vienna, Austria
| | - Barbara Bohle
- Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Beatrice Jahn-Schmid
- Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
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