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Heil M. Self-DNA driven inflammation in COVID-19 and after mRNA-based vaccination: lessons for non-COVID-19 pathologies. Front Immunol 2024; 14:1259879. [PMID: 38439942 PMCID: PMC10910434 DOI: 10.3389/fimmu.2023.1259879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 12/26/2023] [Indexed: 03/06/2024] Open
Abstract
The coronavirus disease 2019 (COVID-19) pandemic triggered an unprecedented concentration of economic and research efforts to generate knowledge at unequalled speed on deregulated interferon type I signalling and nuclear factor kappa light chain enhancer in B-cells (NF-κB)-driven interleukin (IL)-1β, IL-6, IL-18 secretion causing cytokine storms. The translation of the knowledge on how the resulting systemic inflammation can lead to life-threatening complications into novel treatments and vaccine technologies is underway. Nevertheless, previously existing knowledge on the role of cytoplasmatic or circulating self-DNA as a pro-inflammatory damage-associated molecular pattern (DAMP) was largely ignored. Pathologies reported 'de novo' for patients infected with Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV)-2 to be outcomes of self-DNA-driven inflammation in fact had been linked earlier to self-DNA in different contexts, e.g., the infection with Human Immunodeficiency Virus (HIV)-1, sterile inflammation, and autoimmune diseases. I highlight particularly how synergies with other DAMPs can render immunogenic properties to normally non-immunogenic extracellular self-DNA, and I discuss the shared features of the gp41 unit of the HIV-1 envelope protein and the SARS-CoV 2 Spike protein that enable HIV-1 and SARS-CoV-2 to interact with cell or nuclear membranes, trigger syncytia formation, inflict damage to their host's DNA, and trigger inflammation - likely for their own benefit. These similarities motivate speculations that similar mechanisms to those driven by gp41 can explain how inflammatory self-DNA contributes to some of most frequent adverse events after vaccination with the BNT162b2 mRNA (Pfizer/BioNTech) or the mRNA-1273 (Moderna) vaccine, i.e., myocarditis, herpes zoster, rheumatoid arthritis, autoimmune nephritis or hepatitis, new-onset systemic lupus erythematosus, and flare-ups of psoriasis or lupus. The hope is to motivate a wider application of the lessons learned from the experiences with COVID-19 and the new mRNA vaccines to combat future non-COVID-19 diseases.
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Affiliation(s)
- Martin Heil
- Departamento de Ingeniería Genética, Laboratorio de Ecología de Plantas, Centro de Investigación y de Estudios Avanzados (CINVESTAV)-Unidad Irapuato, Irapuato, Mexico
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2
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Ware SA, Kliment CR, Giordano L, Redding KM, Rumsey WL, Bates S, Zhang Y, Sciurba FC, Nouraie SM, Kaufman BA. Cell-free DNA levels associate with COPD exacerbations and mortality. Respir Res 2024; 25:42. [PMID: 38238743 PMCID: PMC10797855 DOI: 10.1186/s12931-023-02658-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 12/26/2023] [Indexed: 01/22/2024] Open
Abstract
THE QUESTION ADDRESSED BY THE STUDY Good biological indicators capable of predicting chronic obstructive pulmonary disease (COPD) phenotypes and clinical trajectories are lacking. Because nuclear and mitochondrial genomes are damaged and released by cigarette smoke exposure, plasma cell-free mitochondrial and nuclear DNA (cf-mtDNA and cf-nDNA) levels could potentially integrate disease physiology and clinical phenotypes in COPD. This study aimed to determine whether plasma cf-mtDNA and cf-nDNA levels are associated with COPD disease severity, exacerbations, and mortality risk. MATERIALS AND METHODS We quantified mtDNA and nDNA copy numbers in plasma from participants enrolled in the Evaluation of COPD Longitudinally to Identify Predictive Surrogate Endpoints (ECLIPSE, n = 2,702) study and determined associations with relevant clinical parameters. RESULTS Of the 2,128 participants with COPD, 65% were male and the median age was 64 (interquartile range, 59-69) years. During the baseline visit, cf-mtDNA levels positively correlated with future exacerbation rates in subjects with mild/moderate and severe disease (Global Initiative for Obstructive Lung Disease [GOLD] I/II and III, respectively) or with high eosinophil count (≥ 300). cf-nDNA positively associated with an increased mortality risk (hazard ratio, 1.33 [95% confidence interval, 1.01-1.74] per each natural log of cf-nDNA copy number). Additional analysis revealed that individuals with low cf-mtDNA and high cf-nDNA abundance further increased the mortality risk (hazard ratio, 1.62 [95% confidence interval, 1.16-2.25] per each natural log of cf-nDNA copy number). ANSWER TO THE QUESTION Plasma cf-mtDNA and cf-nDNA, when integrated into quantitative clinical measurements, may aid in improving COPD severity and progression assessment.
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Affiliation(s)
- Sarah A Ware
- Department of Medicine, Division of Cardiology, Center for Metabolism and Mitochondrial Medicine, University of Pittsburgh School of Medicine, 200 Lothrop Street BST W1044, Pittsburgh, PA, 15261, USA
| | - Corrine R Kliment
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Luca Giordano
- Department of Medicine, Division of Cardiology, Center for Metabolism and Mitochondrial Medicine, University of Pittsburgh School of Medicine, 200 Lothrop Street BST W1044, Pittsburgh, PA, 15261, USA
| | - Kevin M Redding
- Department of Medicine, Division of Cardiology, Center for Metabolism and Mitochondrial Medicine, University of Pittsburgh School of Medicine, 200 Lothrop Street BST W1044, Pittsburgh, PA, 15261, USA
| | - William L Rumsey
- GlaxoSmithKline Respiratory Therapeutic Area Unit, Collegeville, PA, USA
| | - Stewart Bates
- GlaxoSmithKline Respiratory Therapeutic Area Unit, Stevenage, UK
| | - Yingze Zhang
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Frank C Sciurba
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - S Mehdi Nouraie
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
- UPMC Montefiore Hospital, NW628 3459 Fifth Avenue, Pittsburgh, PA, 15213, USA.
| | - Brett A Kaufman
- Department of Medicine, Division of Cardiology, Center for Metabolism and Mitochondrial Medicine, University of Pittsburgh School of Medicine, 200 Lothrop Street BST W1044, Pittsburgh, PA, 15261, USA.
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3
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Mishchenko TA, Turubanova VD, Gorshkova EN, Krysko O, Vedunova MV, Krysko DV. Glioma: bridging the tumor microenvironment, patient immune profiles and novel personalized immunotherapy. Front Immunol 2024; 14:1299064. [PMID: 38274827 PMCID: PMC10809268 DOI: 10.3389/fimmu.2023.1299064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 12/11/2023] [Indexed: 01/27/2024] Open
Abstract
Glioma is the most common primary brain tumor, characterized by a consistently high patient mortality rate and a dismal prognosis affecting both survival and quality of life. Substantial evidence underscores the vital role of the immune system in eradicating tumors effectively and preventing metastasis, underscoring the importance of cancer immunotherapy which could potentially address the challenges in glioma therapy. Although glioma immunotherapies have shown promise in preclinical and early-phase clinical trials, they face specific limitations and challenges that have hindered their success in further phase III trials. Resistance to therapy has been a major challenge across many experimental approaches, and as of now, no immunotherapies have been approved. In addition, there are several other limitations facing glioma immunotherapy in clinical trials, such as high intra- and inter-tumoral heterogeneity, an inherently immunosuppressive microenvironment, the unique tissue-specific interactions between the central nervous system and the peripheral immune system, the existence of the blood-brain barrier, which is a physical barrier to drug delivery, and the immunosuppressive effects of standard therapy. Therefore, in this review, we delve into several challenges that need to be addressed to achieve boosted immunotherapy against gliomas. First, we discuss the hurdles posed by the glioma microenvironment, particularly its primary cellular inhabitants, in particular tumor-associated microglia and macrophages (TAMs), and myeloid cells, which represent a significant barrier to effective immunotherapy. Here we emphasize the impact of inducing immunogenic cell death (ICD) on the migration of Th17 cells into the tumor microenvironment, converting it into an immunologically "hot" environment and enhancing the effectiveness of ongoing immunotherapy. Next, we address the challenge associated with the accurate identification and characterization of the primary immune profiles of gliomas, and their implications for patient prognosis, which can facilitate the selection of personalized treatment regimens and predict the patient's response to immunotherapy. Finally, we explore a prospective approach to developing highly personalized vaccination strategies against gliomas, based on the search for patient-specific neoantigens. All the pertinent challenges discussed in this review will serve as a compass for future developments in immunotherapeutic strategies against gliomas, paving the way for upcoming preclinical and clinical research endeavors.
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Affiliation(s)
- Tatiana A. Mishchenko
- Institute of Biology and Biomedicine, National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Victoria D. Turubanova
- Institute of Biology and Biomedicine, National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
- Neuroscience Research Institute, National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Ekaterina N. Gorshkova
- Institute of Biology and Biomedicine, National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Olga Krysko
- Cell Death Investigation and Therapy Laboratory, Anatomy and Embryology Unit, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Maria V. Vedunova
- Institute of Biology and Biomedicine, National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
- Faculty of Biology and Biotechnologies, National Research University Higher School of Economics, Moscow, Russia
| | - Dmitri V. Krysko
- Institute of Biology and Biomedicine, National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
- Cell Death Investigation and Therapy Laboratory, Anatomy and Embryology Unit, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Pathophysiology, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
- Cancer Research Institute Ghent, Ghent, Belgium
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Choong CJ, Mochizuki H. Involvement of Mitochondria in Parkinson's Disease. Int J Mol Sci 2023; 24:17027. [PMID: 38069350 PMCID: PMC10707101 DOI: 10.3390/ijms242317027] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 12/18/2023] Open
Abstract
Mitochondrial dysregulation, such as mitochondrial complex I deficiency, increased oxidative stress, perturbation of mitochondrial dynamics and mitophagy, has long been implicated in the pathogenesis of PD. Initiating from the observation that mitochondrial toxins cause PD-like symptoms and mitochondrial DNA mutations are associated with increased risk of PD, many mutated genes linked to familial forms of PD, including PRKN, PINK1, DJ-1 and SNCA, have also been found to affect the mitochondrial features. Recent research has uncovered a much more complex involvement of mitochondria in PD. Disruption of mitochondrial quality control coupled with abnormal secretion of mitochondrial contents to dispose damaged organelles may play a role in the pathogenesis of PD. Furthermore, due to its bacterial ancestry, circulating mitochondrial DNAs can function as damage-associated molecular patterns eliciting inflammatory response. In this review, we summarize and discuss the connection between mitochondrial dysfunction and PD, highlighting the molecular triggers of the disease process, the intra- and extracellular roles of mitochondria in PD as well as the therapeutic potential of mitochondrial transplantation.
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Affiliation(s)
| | - Hideki Mochizuki
- Department of Neurology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita 565-0871, Osaka, Japan;
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Shen Y, Chen L, Chen J, Qin J, Wang T, Wen F. Mitochondrial damage-associated molecular patterns in chronic obstructive pulmonary disease: Pathogenetic mechanism and therapeutic target. J Transl Int Med 2023; 11:330-340. [PMID: 38130648 PMCID: PMC10732348 DOI: 10.2478/jtim-2022-0019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a common inflammatory airway disease characterized by enhanced inflammation. Recent studies suggest that mitochondrial damage-associated molecular patterns (DAMPs) may play an important role in the regulation of inflammation and are involved in a serial of inflammatory diseases, and they may also be involved in COPD. This review highlights the potential role of mitochondrial DAMPs during COPD pathogenesis and discusses the therapeutic potential of targeting mitochondrial DAMPs and their related signaling pathways and receptors for COPD. Research progress on mitochondrial DAMPs may enhance our understanding of COPD inflammation and provide novel therapeutic targets.
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Affiliation(s)
- Yongchun Shen
- Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University and Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, Chengdu610041, Sichuan Province, China
| | - Lei Chen
- Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University and Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, Chengdu610041, Sichuan Province, China
| | - Jun Chen
- Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University and Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, Chengdu610041, Sichuan Province, China
| | - Jiangyue Qin
- Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University and Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, Chengdu610041, Sichuan Province, China
| | - Tao Wang
- Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University and Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, Chengdu610041, Sichuan Province, China
| | - Fuqiang Wen
- Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University and Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, Chengdu610041, Sichuan Province, China
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Seewald LA, Sabino IG, Montney KL, Delco ML. Synovial fluid mitochondrial DNA concentration reflects the degree of cartilage damage after naturally occurring articular injury. Osteoarthritis Cartilage 2023; 31:1056-1065. [PMID: 37028640 PMCID: PMC10524327 DOI: 10.1016/j.joca.2023.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 02/27/2023] [Accepted: 03/19/2023] [Indexed: 04/09/2023]
Abstract
OBJECTIVE To evaluate mitochondrial DNA (mtDNA) release from injured chondrocytes and investigate the utility of synovial fluid mtDNA concentration in early detection of posttraumatic osteoarthritis. METHOD We measured mtDNA release using four models of osteoarthritis: in vitro interleukin-1β stimulation of cultured equine chondrocytes, ex vivo mechanical impact of bovine cartilage explants, in vivo mechanical impact of equine articular cartilage, and naturally occurring equine intraarticular fracture. In our in vivo model, one group was treated with an intraarticular injection of the mitoprotective peptide SS-31 following cartilage injury. mtDNA content was quantified using qPCR. For naturally occurring cases of joint injury, clinical data (radiographs, arthroscopic video footage) were scored for criteria associated with degenerative joint disease. RESULTS Chondrocytes released mtDNA in the acute time frame following inflammatory and mechanical cellular stress in vitro. mtDNA was increased in equine synovial fluid following experimental and naturally occurring injury to the joint surface. In naturally occurring posttraumatic osteoarthritis, we found a strong positive correlation between the degree of cartilage damage and mtDNA concentration (r = 0.80, P = 0.0001). Finally, impact-induced mtDNA release was mitigated by mitoprotective treatment. CONCLUSION Changes in synovial fluid mtDNA occur following joint injury and correlate with the severity of cartilage damage. Mitoprotection mitigates increases in synovial fluid mtDNA suggesting that mtDNA release may reflect mitochondrial dysfunction. Further investigation of mtDNA as a potentially sensitive marker of early articular injury and response to mitoprotective therapy is warranted.
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Affiliation(s)
- L A Seewald
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
| | - I G Sabino
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
| | - K L Montney
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
| | - M L Delco
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
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7
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Wu L, Pu L, Zhuang Z. miR-155-5p/FOXO3a promotes pulmonary fibrosis in rats by mediating NLRP3 inflammasome activation. Immunopharmacol Immunotoxicol 2023; 45:257-267. [PMID: 35997271 DOI: 10.1080/08923973.2022.2115923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE Pulmonary fibrosis (PF) is regarded as progressive lung disease. miR-155-5p depletion exerts anti-fibrotic effects in silicotic mice. This study explored the effect and possible mechanism of miR-155-5p in PF rats, hoping to find a new target for PF management. METHODS Bleomycin-induced PF rat model was established. Alveolar structure and collagen fiber deposition were observed by HE and Elastica-Masson staining. Alveolitis and PF scores were evaluated using the method of Szapiel. Total collagen content was detected using the Sircol method. PF rats were intraperitoneally injected with NLRP3 inhibitor MCC950 or intravenously injected with miR-155-5p antagomir and si-FOXO3a lentivirus plasmids. Binding sites of miR-155-5p and FOXO3a were predicted using bioinformatics analysis and dual-luciferase reporter assay. The expressions of miR-155-5p, NLRP3, ASC, caspase-1, IL-1β, IL-18, and FOXO3a were detected by RT-qPCR, Western blot, and ELISA. RESULTS MCC950 treatment inhibited NLRP3 inflammasome, alleviated alveolar hemorrhage and alveolitis, and reduced blue collagen fiber deposition, scores of alveolitis and PF, and levels of NLRP3, ASC, caspase-1, IL-1β, and IL-18 in PF rats. miR-155-5p was elevated in lung tissues of PF rats. Inhibition of miR-155-5p downregulated levels of NLRP3, ASC, caspase-1, IL-1β, and IL-18 in lung tissues of PF rats. miR-155-5p targeted FOXO3a. miR-155-5p inhibition and silencing FOXO3a exacerbated alveolitis and PF in rats and increased levels of NLRP3, ASC, caspase-1, IL-1β, and IL-18. CONCLUSIONS miR-155-5p aggravated alveolitis and promoted PF by targeting FOXO3a and prompting the activation of NLRP3 inflammasome and then inducing IL-1β and IL-18 release.
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Affiliation(s)
- Ling Wu
- Department of Respiratory, Wujin Hospital Affiliated with Jiangsu University, Jiangsu Province, Changzhou, PR China
| | - Li Pu
- Department of Respiratory, Wujin Hospital Affiliated with Jiangsu University, Jiangsu Province, Changzhou, PR China
| | - Zhifang Zhuang
- Department of Respiratory, Wujin Hospital Affiliated with Jiangsu University, Jiangsu Province, Changzhou, PR China
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Chen Y, Zhang Y, Li N, Jiang Z, Li X. Role of mitochondrial stress and the NLRP3 inflammasome in lung diseases. Inflamm Res 2023; 72:829-846. [PMID: 36905430 PMCID: PMC10007669 DOI: 10.1007/s00011-023-01712-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 12/17/2022] [Accepted: 02/17/2023] [Indexed: 03/12/2023] Open
Abstract
BACKGROUND As an organelle essential for intracellular energy supply, mitochondria are involved in intracellular metabolism and inflammation, and cell death. The interaction of mitochondria with the NLRP3 inflammasome in the development of lung diseases has been extensively studied. However, the exact mechanism by which mitochondria mediate the activation of the NLRP3 inflammasome and trigger lung disease is still unclear. METHODS The literatures related to mitochondrial stress, NLRP3 inflammasome and lung diseases were searched in PubMed. RESULTS This review aims to provide new insights into the recently discovered mitochondrial regulation of the NLRP3 inflammasome in lung diseases. It also describes the crucial roles of mitochondrial autophagy, long noncoding RNA, micro RNA, altered mitochondrial membrane potential, cell membrane receptors, and ion channels in mitochondrial stress and regulation of the NLRP3 inflammasome, in addition to the reduction of mitochondrial stress by nuclear factor erythroid 2-related factor 2 (Nrf2). The effective components of potential drugs for the treatment of lung diseases under this mechanism are also summarized. CONCLUSION This review provides a resource for the discovery of new therapeutic mechanisms and suggests ideas for the development of new therapeutic drugs, thus promoting the rapid treatment of lung diseases.
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Affiliation(s)
- Yonghu Chen
- Yanbian University Hospital, Yanbian University, Yanji, 133002, People's Republic of China
| | - Yuqi Zhang
- Shenyang Pharmaceutical University, Shenyang, 110016, People's Republic of China
| | - Ning Li
- Shenyang Pharmaceutical University, Shenyang, 110016, People's Republic of China
| | - Zhe Jiang
- Yanbian University Hospital, Yanbian University, Yanji, 133002, People's Republic of China.
| | - Xuezheng Li
- Yanbian University Hospital, Yanbian University, Yanji, 133002, People's Republic of China.
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Lee SW, Oh SY, Park HJ, Kim TC, Park YH, Van Kaer L, Hong S. Phosphorothioate-linked guanine/cytosine-based stem-loop oligonucleotides induce the extracellular release of mitochondrial DNA from peritoneal B1a cells. Int J Biol Macromol 2022; 223:252-262. [PMID: 36347365 DOI: 10.1016/j.ijbiomac.2022.10.280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 09/07/2022] [Accepted: 10/31/2022] [Indexed: 11/07/2022]
Abstract
It has been previously demonstrated that phosphorothioate-linked GpC-based stem-loop oligonucleotides (GC-SL ODN) induce the release of mitochondrial DNA (mtDNA) from chronic lymphocytic leukemia (CLL) B cells. Although CLL B cells are believed to originate from CD5+ B cells because of their phenotypic similarities, it remains unclear whether GC-SL ODN can stimulate CD5+ B1 cells to secrete mtDNA. To explore this possibility, we compared the frequency of the mtDNA-producing population among peritoneal cells after GC-SL ODN treatment. We found that mtDNA-releasing cells are enriched for peritoneal CD19+ B cells upon GC-SL ODN challenge. Among peritoneal CD19+ B cells, the CD5+ B1a subpopulation was a primary cellular source of mtDNA secretion in GC-SL ODN-elicited immune responses. GC-SL ODN-stimulated mtDNA release by B1a cells was positively regulated by MyD88 and TRIF signaling pathways. In vivo GC-SL ODN treatment increased lipopolysaccharide-induced activation of innate immune cells such as NK cells, suggesting the immune-enhancing effects of mtDNA secretion. Furthermore, the loop size formed by GC-SL ODNs was a critical factor in inducing mtDNA release by B1a cells. Taken together, our results identified GC-SL ODN as promising biomaterials for enhancing immune responses.
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Affiliation(s)
- Sung Won Lee
- Department of Integrative Bioscience and Biotechnology, Institute of Anticancer Medicine Development, Sejong University, Seoul 05006, Republic of Korea
| | - So Young Oh
- Department of Integrative Bioscience and Biotechnology, Institute of Anticancer Medicine Development, Sejong University, Seoul 05006, Republic of Korea
| | - Hyun Jung Park
- Department of Integrative Bioscience and Biotechnology, Institute of Anticancer Medicine Development, Sejong University, Seoul 05006, Republic of Korea
| | - Tae-Cheol Kim
- Department of Integrative Bioscience and Biotechnology, Institute of Anticancer Medicine Development, Sejong University, Seoul 05006, Republic of Korea
| | - Yun Hoo Park
- Department of Integrative Bioscience and Biotechnology, Institute of Anticancer Medicine Development, Sejong University, Seoul 05006, Republic of Korea
| | - Luc Van Kaer
- Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Seokmann Hong
- Department of Integrative Bioscience and Biotechnology, Institute of Anticancer Medicine Development, Sejong University, Seoul 05006, Republic of Korea.
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Long G, Gong R, Wang Q, Zhang D, Huang C. Role of released mitochondrial DNA in acute lung injury. Front Immunol 2022; 13:973089. [PMID: 36059472 PMCID: PMC9433898 DOI: 10.3389/fimmu.2022.973089] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 08/01/2022] [Indexed: 12/02/2022] Open
Abstract
Acute lung injury(ALI)/acute respiratory distress syndrome(ARDS) is a form of acute-onset hypoxemic respiratory failure characterised by an acute, diffuse, inflammatory lung injury, and increased alveolar-capillary permeability, which is caused by a variety of pulmonary or nonpulmonary insults. Recently, aberrant mitochondria and mitochondrial DNA(mtDNA) level are associated with the development of ALI/ARDS, and plasma mtDNA level shows the potential to be a promising biomarker for clinical diagnosis and evaluation of lung injury severity. In mechanism, the mtDNA and its oxidised form, which are released from impaired mitochondria, play a crucial role in the inflammatory response and histopathological changes in the lung. In this review, we discuss mitochondrial outer membrane permeabilisation (MOMP), mitochondrial permeability transition pore(mPTP), extracellular vesicles (EVs), extracellular traps (ETs), and passive release as the principal mechanisms for the release of mitochondrial DNA into the cytoplasm and extracellular compartments respectively. Further, we explain how the released mtDNA and its oxidised form can induce inflammatory cytokine production and aggravate lung injury through the Toll-like receptor 9(TLR9) signalling, cytosolic cGAS-stimulator of interferon genes (STING) signalling (cGAS-STING) pathway, and inflammasomes activation. Additionally, we propose targeting mtDNA-mediated inflammatory pathways as a novel therapeutic approach for treating ALI/ARDS.
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Affiliation(s)
- Gangyu Long
- Wuhan Jinyintan Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Rui Gong
- The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Qian Wang
- Wuhan Jinyintan Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Dingyu Zhang
- Wuhan Jinyintan Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
- The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
- Hubei Clinical Research Center for Infectious Diseases, Wuhan, China
- Wuhan Research Center for Communicable Disease Diagnosis and Treatment, Chinese Academy of Medical Sciences, Wuhan, China
- Joint Laboratory of Infectious Diseases and Health, Wuhan Institute of Virology and Wuhan Jinyintan Hospital, Chinese Academy of Sciences, Wuhan, China
- *Correspondence: Dingyu Zhang, ; Chaolin Huang,
| | - Chaolin Huang
- Wuhan Jinyintan Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
- Hubei Clinical Research Center for Infectious Diseases, Wuhan, China
- Wuhan Research Center for Communicable Disease Diagnosis and Treatment, Chinese Academy of Medical Sciences, Wuhan, China
- Joint Laboratory of Infectious Diseases and Health, Wuhan Institute of Virology and Wuhan Jinyintan Hospital, Chinese Academy of Sciences, Wuhan, China
- *Correspondence: Dingyu Zhang, ; Chaolin Huang,
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Layunta E, Latorre E, Grasa L, Arruebo MP, Buey B, Alcalde AI, Mesonero JE. Intestinal serotonergic system is modulated by Toll-like receptor 9. J Physiol Biochem 2022; 78:689-701. [PMID: 35670957 PMCID: PMC9381617 DOI: 10.1007/s13105-022-00897-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 05/14/2022] [Indexed: 12/03/2022]
Abstract
Intestinal serotonergic system is a key modulator of intestinal homeostasis; however, its regulation is still unclear. Toll-like receptor 9 (TLR9), an innate immune receptor, detects different external agents in the intestine, preserving intestinal integrity. Since little is known about TLR9 role in the intestine, our aim was to address the potential regulation between TLR9 and intestinal serotonergic system. Caco-2/TC7 cell line and intestinal tract of Tlr9−/− mice were used in this study. Serotonin uptake studies were performed, and molecular expression of different serotonergic components was analyzed by western blot and real-time PCR. Our results show that TLR9 activation inhibits serotonin transporter activity and expression, involving p38/MAPK and ERK/MAPK intracellular pathways, and reciprocally, serotonin increases TLR9 expression. Supporting this interaction, serotonin transporter, serotonin receptors and serotonin producer enzymes were found altered in intestinal tract of Tlr9−/− mice. We conclude that TLR9 could contribute to intestinal homeostasis by modulation of intestinal serotonergic system.
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Affiliation(s)
- Elena Layunta
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Gothenburg, Sweden.,Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain
| | - Eva Latorre
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain. .,Instituto Agroalimentario de Aragón - IA2- (Universidad de Zaragoza - CITA), Zaragoza, Spain. .,Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain.
| | - Laura Grasa
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain.,Instituto Agroalimentario de Aragón - IA2- (Universidad de Zaragoza - CITA), Zaragoza, Spain.,Departamento de Farmacología, Fisiología y Medicina Legal y Forense, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
| | - María Pilar Arruebo
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain.,Instituto Agroalimentario de Aragón - IA2- (Universidad de Zaragoza - CITA), Zaragoza, Spain.,Departamento de Farmacología, Fisiología y Medicina Legal y Forense, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
| | - Berta Buey
- Departamento de Farmacología, Fisiología y Medicina Legal y Forense, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
| | - Ana I Alcalde
- Departamento de Farmacología, Fisiología y Medicina Legal y Forense, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
| | - José E Mesonero
- Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain.,Instituto Agroalimentario de Aragón - IA2- (Universidad de Zaragoza - CITA), Zaragoza, Spain.,Departamento de Farmacología, Fisiología y Medicina Legal y Forense, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
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12
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Wu H, Yin G, Pu X, Wang J, Liao X, Huang Z. Preliminary Study on the Antigen-Removal from Extracellular Matrix via Different Decellularization. Tissue Eng Part C Methods 2022; 28:250-263. [PMID: 35596569 DOI: 10.1089/ten.tec.2022.0025] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Due to the abundance of bioactive components, surficial decoration with cell-derived extracellular matrix (ECM) is a promising strategy to improve the biological functionality of the tissue engineering scaffolds. However, decellularization is necessary to remove antigenic components in the ECM that may trigger adverse immune response. Freeze-thaw (FT) cycles and treatment with Triton X-100/ammonium hydroxide (TN) are two commonly used decellularization methods for ECM, but their effects on both growth factor retention and antigen removal are still controversial. The objectives of this study are to compare the preservation of ECM texture and beneficial ingredients and the removal of cellular antigens by these two methods. First, the constructs combined bone marrow mesenchymal stem cell-derived ECM and poly(lactic-co-glycolic acid) (PLGA) membrane are prepared and decellularized using FT and TN treatments. Moreover, the effects of decellularization on the ultrastructure and the composition of ECM-decorated PLGA membrane are compared by scanning electron microscope observation and protein quantification. Furthermore, the ECM deposited on PLGA is stripped off and then implanted subcutaneously in rats, and the host macrophage and local lymphocyte responses were investigated. Finally, ECM-decorated porous PLGA scaffolds are implanted into rat calvarial defects, and the new bone formation is evaluated. Our results showed that both methods effectively removed DNA. TN treatment partially retained collagen, glycosaminoglycan, bone morphogenetic protein-2, and vascular endothelial growth factor, and better preserved structural integrity than FT treatment. ECM implants decellularized by both methods induced a mild host response after subcutaneous implantation. Although the total content of residual DNA in the two ECMs digested by the DNA enzyme seemed to be similar and very low, the interfaces between implanted materials and natural tissues in the TN group recruited lower numbers of CD68+ macrophages, CD68+CD86+ (M1) macrophages, and CD4+ T lymphocytes than that in FT group, implying that there exist other ECM antigens to influence immune response besides DNA. Furthermore, ECM-decorated scaffolds decellularized by TN treatment induced greater bone formation than that of bare scaffolds in vivo, demonstrating the effective retention of ECM bioactive components after decellularization. This study showed that TN treatment was a more effective and safer decellularization method than FT cycles. Impact statement Decellularization is a prerequisite for extracellular matrix (ECM) application, but there is still no standard for its selection. This study demonstrated that detergent treatment was more effective than freeze-thaw (FT) cycles in removing ECM antigens besides DNA, and the prepared ECM elicited a milder allogenic immune response, which ensured the safety of ECM. Moreover, detergent better preserved the ECM integrity than FT cycles, and effectively retained growth factors, and the decellularized ECM-decorated scaffolds significantly promoted bone repair, which ensured the effectiveness of ECM. This study provides the theoretical and experimental bases for the decellularization strategy of ECM-modified tissue engineering scaffolds.
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Affiliation(s)
- Huan Wu
- College of Biomedical Engineering, Sichuan University, Chengdu, P.R. China
| | - Guangfu Yin
- College of Biomedical Engineering, Sichuan University, Chengdu, P.R. China
| | - Ximing Pu
- College of Biomedical Engineering, Sichuan University, Chengdu, P.R. China
| | - Juan Wang
- College of Biomedical Engineering, Sichuan University, Chengdu, P.R. China
| | - Xiaoming Liao
- College of Biomedical Engineering, Sichuan University, Chengdu, P.R. China
| | - Zhongbing Huang
- College of Biomedical Engineering, Sichuan University, Chengdu, P.R. China
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13
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Qin Y, Chen Y, Chen J, Xu K, Xu F, Shi J. The relationship between previous pulmonary tuberculosis and risk of lung cancer in the future. Infect Agent Cancer 2022; 17:20. [PMID: 35525982 PMCID: PMC9078090 DOI: 10.1186/s13027-022-00434-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 04/19/2022] [Indexed: 01/29/2023] Open
Abstract
Various investigations have expanded the views that tuberculosis is an important risk factor for lung cancer occurrence. Lung cancer originates from chronic inflammation and infection. It is becoming clearer that Mycobacterium tuberculosis (M.tb) in tuberculosis patients meticulously schemes multiple mechanisms to induce tumor formation and is indispensable to participate in the occurrence of lung cancer. In addition, some additional factors such as age, sex and smoking, accelerate the development of lung cancer after Mycobacterium tuberculosis infection. The clarification of these insights is fostering new diagnoses and therapeutic approaches to prevention of the patients developing from tuberculosis into lung cancer.
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Affiliation(s)
- Yongwei Qin
- Department of Pathogen Biology, Medical College, Nantong University, No. 19 Qixiu Road, Nantong, China.,Nantong Key Laboratory of Translational Medicine in Cardiothoracic Diseases, Nantong Clinical Medical Research Center of Cardiothoracic Disease, and Institution of Translational Medicine in Cardiothoracic Diseases, Affiliated Hospital of Nantong University, Nantong, China
| | - Yujie Chen
- Nantong Key Laboratory of Translational Medicine in Cardiothoracic Diseases, Nantong Clinical Medical Research Center of Cardiothoracic Disease, and Institution of Translational Medicine in Cardiothoracic Diseases, Affiliated Hospital of Nantong University, Nantong, China
| | - Jinliang Chen
- Department of Respiratory Medicine, The Second Affiliated Hospital of Nantong University, Nantong First People's Hospital, No. 6 North Road Hai'er Xiang, Nantong, 226001, Jiangsu, China
| | - Kuang Xu
- Department of Pathogen Biology, Medical College, Nantong University, No. 19 Qixiu Road, Nantong, China
| | - Feifan Xu
- Affiliated Nantong Hospital of Shanghai University, No. 500 Yonghe Road, Nantong, China.
| | - Jiahai Shi
- Nantong Key Laboratory of Translational Medicine in Cardiothoracic Diseases, Nantong Clinical Medical Research Center of Cardiothoracic Disease, and Institution of Translational Medicine in Cardiothoracic Diseases, Affiliated Hospital of Nantong University, Nantong, China.
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14
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A new cell death program regulated by toll-like receptor 9 through p38 mitogen-activated protein kinase signaling pathway in a neonatal rat model with sepsis associated encephalopathy. Chin Med J (Engl) 2022; 135:1474-1485. [PMID: 35261352 PMCID: PMC9481440 DOI: 10.1097/cm9.0000000000002010] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Background: Sepsis, a serious condition with high mortality, usually causes sepsis associated encephalopathy (SAE) that involves neuronal cell death. However, the cell death programs involved and their underlying mechanisms are not clear. This study aimed to explore the regulatory mechanisms of different cell death programs in SAE. Methods: A neonatal rat model of SAE was established by cecal ligation and perforation. Survival rate and vital signs (mean arterial pressure and heart rate) were monitored, nerve reflexes were evaluated, and cortical pathological changes were observed by hematoxylin and eosin staining. The expression of pyroptosis, apoptosis, and necroptosis (PANoptosis)-related proteins, mitogen- activated protein kinase (MAPK), and its upstream regulator toll-like receptor 9 (TLR9) were detected. The expression of TLR9 in neurons was observed by immunofluorescence staining. The ultrastructure of neurons was observed by transmission electron microscope. Results: First, PANoptosis was found in cortical nerve cells of the SAE rats. Meanwhile, the subunits of MAPKs, p38 MAPK, Jun N- terminal kinase, and extracellular signal-regulated kinase (ERK) were activated. After pharmacologically inhibiting each of the subunits, only p38 MAPK was found to be associated with PANoptosis. Furthermore, blocking the p38 MAPK signaling pathway activated necroptosis but inhibited apoptosis and pyroptosis. When necroptosis was pharmacologically inhibited, apoptosis and pyroptosis were reactivated. Finally, we found that the expression of TLR9, a regulator of MAPKs, was significantly increased in this model. After down-regulation of TLR9, p38 MAPK, and ERK signaling pathways were inhibited, which led to the inhibition of PANoptosis. Further analysis found that down-regulation of TLR9 improved the survival rate and reduced the pathological changes in SAE rats. Conclusions: Our study showed that the programs comprising PANoptosis are activated simultaneously in SAE rats. TLR9 activated PANoptosis through the p38 MAPK signaling pathway. TLR9 may work as a potential target for SAE treatment.
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15
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León BE, Kang S, Franca-Solomon G, Shang P, Choi DS. Alcohol-Induced Neuroinflammatory Response and Mitochondrial Dysfunction on Aging and Alzheimer's Disease. Front Behav Neurosci 2022; 15:778456. [PMID: 35221939 PMCID: PMC8866940 DOI: 10.3389/fnbeh.2021.778456] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 12/07/2021] [Indexed: 12/27/2022] Open
Abstract
Mitochondria are essential organelles central to various cellular functions such as energy production, metabolic pathways, signaling transduction, lipid biogenesis, and apoptosis. In the central nervous system, neurons depend on mitochondria for energy homeostasis to maintain optimal synaptic transmission and integrity. Deficiencies in mitochondrial function, including perturbations in energy homeostasis and mitochondrial dynamics, contribute to aging, and Alzheimer's disease. Chronic and heavy alcohol use is associated with accelerated brain aging, and increased risk for dementia, especially Alzheimer's disease. Furthermore, through neuroimmune responses, including pro-inflammatory cytokines, excessive alcohol use induces mitochondrial dysfunction. The direct and indirect alcohol-induced neuroimmune responses, including pro-inflammatory cytokines, are critical for the relationship between alcohol-induced mitochondrial dysfunction. In the brain, alcohol activates microglia and increases inflammatory mediators that can impair mitochondrial energy production, dynamics, and initiate cell death pathways. Also, alcohol-induced cytokines in the peripheral organs indirectly, but synergistically exacerbate alcohol's effects on brain function. This review will provide recent and advanced findings focusing on how alcohol alters the aging process and aggravates Alzheimer's disease with a focus on mitochondrial function. Finally, we will contextualize these findings to inform clinical and therapeutic approaches towards Alzheimer's disease.
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Affiliation(s)
- Brandon Emanuel León
- Regenerative Sciences Program, Center for Regenerative Medicine, Mayo Clinic, Rochester, MN, United States
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States
| | - Shinwoo Kang
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States
| | - Gabriela Franca-Solomon
- Neuroscience Program, Mayo Clinic College of Medicine and Science, Rochester, MN, United States
| | - Pei Shang
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States
| | - Doo-Sup Choi
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States
- Neuroscience Program, Mayo Clinic College of Medicine and Science, Rochester, MN, United States
- Department of Psychiatry and Psychology, Mayo Clinic College of Medicine and Science, Rochester, MN, United States
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16
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The interplay of DAMPs, TLR4, and proinflammatory cytokines in pulmonary fibrosis. J Mol Med (Berl) 2021; 99:1373-1384. [PMID: 34258628 PMCID: PMC8277227 DOI: 10.1007/s00109-021-02113-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 06/29/2021] [Accepted: 07/05/2021] [Indexed: 02/07/2023]
Abstract
Pulmonary fibrosis is a chronic debilitating condition characterized by progressive deposition of connective tissue, leading to a steady restriction of lung elasticity, a decline in lung function, and a median survival of 4.5 years. The leading causes of pulmonary fibrosis are inhalation of foreign particles (such as silicosis and pneumoconiosis), infections (such as post COVID-19), autoimmune diseases (such as systemic autoimmune diseases of the connective tissue), and idiopathic pulmonary fibrosis. The therapeutics currently available for pulmonary fibrosis only modestly slow the progression of the disease. This review is centered on the interplay of damage-associated molecular pattern (DAMP) molecules, Toll-like receptor 4 (TLR4), and inflammatory cytokines (such as TNF-α, IL-1β, and IL-17) as they contribute to the pathogenesis of pulmonary fibrosis, and the possible avenues to develop effective therapeutics that disrupt this interplay.
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17
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Barrera MJ, Aguilera S, Castro I, Carvajal P, Jara D, Molina C, González S, González MJ. Dysfunctional mitochondria as critical players in the inflammation of autoimmune diseases: Potential role in Sjögren's syndrome. Autoimmun Rev 2021; 20:102867. [PMID: 34118452 DOI: 10.1016/j.autrev.2021.102867] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Accepted: 04/11/2021] [Indexed: 12/13/2022]
Abstract
Relevant reviews highlight the association between dysfunctional mitochondria and inflammation, but few studies address the contribution of mitochondria and mitochondria-endoplasmic reticulum (ER) contact sites (MERCs) to cellular homeostasis and inflammatory signaling. The present review outlines the important role of mitochondria in cellular homeostasis and how dysfunctional mitochondrion can release and misplace mitochondrial components (cardiolipin, mitochondrial DNA (mtDNA), and mitochondrial formylated peptides) through multiple mechanisms. These components can act as damage-associated molecular patterns (DAMPs) and induce an inflammatory response via pattern recognition receptors (PRRs). Accumulation of damaged ROS-generating mitochondria, accompanied by the release of mitochondrial DAMPs, can activate PRRs such as the NLRP3 inflammasome, TLR9, cGAS/STING, and ZBP1. This process would explain the chronic inflammation that is observed in autoimmune diseases such as systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), type I diabetes (T1D), and Sjögren's syndrome. This review also provides a comprehensive overview of the importance of MERCs to mitochondrial function and morphology, cellular homeostasis, and the inflammatory response. MERCs play an important role in calcium homeostasis by mediating the transfer of calcium from the ER to the mitochondria and thereby facilitating the production of ATP. They also contribute to the synthesis and transfer of phospholipids, protein folding in the ER, mitochondrial fission, mitochondrial fusion, initiation of autophagosome formation, regulation of cell death/survival signaling, and regulation of immune responses. Therefore, alterations within MERCs could increase inflammatory signaling, modulate ER stress responses, cell homeostasis, and ultimately, the cell fate. This study shows severe ultrastructural alterations of mitochondria in salivary gland cells from Sjögren's syndrome patients for the first time, which could trigger alterations in cellular bioenergetics. This finding could explain symptoms such as fatigue and malfunction of the salivary glands in Sjögren's syndrome patients, which would contribute to the chronic inflammatory pathology of the disease. However, this is only a first step in solving this complex puzzle, and several other important factors such as changes in mitochondrial morphology, functionality, and their important contacts with other organelles require further in-depth study. Future work should focus on detecting the key milestones that are related to inflammation in patients with autoimmune diseases, such as Sjögren´s syndrome.
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Affiliation(s)
- María-José Barrera
- Facultad de Odontología, Universidad San Sebastián, Bellavista 7, Santiago, 8420524, Chile
| | | | - Isabel Castro
- Departamento de Tecnología Médica, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Patricia Carvajal
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Daniela Jara
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Claudio Molina
- Facultad de Odontología, Universidad San Sebastián, Bellavista 7, Santiago, 8420524, Chile
| | - Sergio González
- Escuela de Odontología, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
| | - María-Julieta González
- Programa de Biología Celular y Molecular, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile.
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18
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Monjezi M, Jamaati H, Noorbakhsh F. Attenuation of ventilator-induced lung injury through suppressing the pro-inflammatory signaling pathways: A review on preclinical studies. Mol Immunol 2021; 135:127-136. [PMID: 33895577 DOI: 10.1016/j.molimm.2021.04.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 03/28/2021] [Accepted: 04/06/2021] [Indexed: 10/21/2022]
Abstract
Mechanical ventilation (MV) is a relatively common medical intervention in ICU patients. The main side effect of MV is the so-called "ventilator-induced lung injury" (VILI). The pathogenesis of VILI is not completely understood; however, it has been reported that MV might be associated with up-regulation of various inflammatory mediators within the lung tissue and that these mediators might act as pathogenic factors in lung tissue injury. One potential mechanism for the generation of inflammatory mediators is through the release of endogenous molecules known as damage associated molecular patterns (DAMPs). These molecules are released from injured tissues and can bind to pattern recognition receptors (PRRs). PRR activation generally leads to the production and release of inflammation-related molecules including innate immune cytokines and chemokines. It has been suggested that blocking DAMP/PRR signaling pathways might diminish the progression of VILI. Herein, we review the latest findings with regard to the effects of DAMP/PRRs and their blockade, as well as the potential therapeutic targets and future research directions in VILI. Results of studies performed on human samples, animal models of disease, as well as relevant in vitro systems will be discussed.
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Affiliation(s)
- Mojdeh Monjezi
- Chronic Respiratory Diseases Research Center (CRDRC), National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamidreza Jamaati
- Chronic Respiratory Diseases Research Center (CRDRC), National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Farshid Noorbakhsh
- Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
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19
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Tsuji N, Agbor-Enoh S. Cell-free DNA beyond a biomarker for rejection: Biological trigger of tissue injury and potential therapeutics. J Heart Lung Transplant 2021; 40:405-413. [PMID: 33926787 DOI: 10.1016/j.healun.2021.03.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/01/2021] [Accepted: 03/03/2021] [Indexed: 12/13/2022] Open
Abstract
Cell-free DNA, measured as donor-derived cell-free DNA is developed as a non-specific biomarker for allograft injury and transplant rejection. However, cell-free DNA characteristics are more specific, its fragment length, nucleotide content, and composition, as well as the tissue source of origin, are intrinsically linked to the underlying disease pathogenesis, showing distinct features in acute cellular rejection and antibody-mediated rejection for example. Further, cell-free DNA and cell-free mitochondrial DNA can directly trigger tissue injury as damage-associated molecular patterns through three major intracellular receptors, toll-like receptor 9 , cyclic guanosine monophosphate-adenosine monophosphate synthase, and inflammasomes (i.e., absent in melanoma 2: AIM2). Therefore, in addition to its role as a non-specific marker for allograft injury, cell-free DNA analysis may be used to phenotype transplant rejection, and to non-invasively point the underlying molecular mechanisms with allograft injury. Novel treatment approaches targeting these cell-free DNA pathways may be useful to treat transplant rejection and prevent end-organ dysfunction. In this review, we discuss the link between cell-free DNA characteristics and disease, the role of cell-free DNA as a damage-associated molecular pattern, and novel therapeutics targeting these cell-free DNA molecular pathways and their potential utility to treat transplant rejection.
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Affiliation(s)
- Naoko Tsuji
- Renal Diagnostics and Therapeutics Unit, National Institutes of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland
| | - Sean Agbor-Enoh
- Lasker Clinical Research Tenure Track Investigator and Laboratory Chief, Laboratory of Applied Precision Omics, National Heart, Lung, and Blood Institute, Bethesda, Maryland; Lung Transplantation Program, Johns Hopkins School of Medicine, Baltimore, M.
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20
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Extracellular DNA in blood products and its potential effects on transfusion. Biosci Rep 2021; 40:222322. [PMID: 32150264 PMCID: PMC7098128 DOI: 10.1042/bsr20192770] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 01/18/2020] [Accepted: 03/03/2020] [Indexed: 02/05/2023] Open
Abstract
Blood transfusions are sometimes necessary after a high loss of blood due to injury or surgery. Some people need regular transfusions due to medical conditions such as haemophilia or cancer. Studies have suggested that extracellular DNA including mitochondrial DNA present in the extracellular milieu of transfused blood products has biological actions that are capable of activating the innate immune systems and potentially contribute to some adverse reactions in transfusion. From the present work, it becomes increasingly clear that extracellular DNA encompassed mitochondrial DNA is far from being biologically inert in blood products. It has been demonstrated to be present in eligible blood products and thus can be transfused to blood recipients. Although the presence of extracellular DNA in human plasma was initially detected in 1948, some aspects have not been fully elucidated. In this review, we summarize the potential origins, clearance mechanisms, relevant structures, and potential role of extracellular DNA in the innate immune responses and its relationship with individual adverse reactions in transfusion.
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21
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Su YJ, Wang PW, Weng SW. The Role of Mitochondria in Immune-Cell-Mediated Tissue Regeneration and Ageing. Int J Mol Sci 2021; 22:2668. [PMID: 33800867 PMCID: PMC7961648 DOI: 10.3390/ijms22052668] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 03/03/2021] [Indexed: 12/25/2022] Open
Abstract
During tissue injury events, the innate immune system responds immediately to alarms sent from the injured cells, and the adaptive immune system subsequently joins in the inflammatory reaction. The control mechanism of each immune reaction relies on the orchestration of different types of T cells and the activators, antigen-presenting cells, co-stimulatory molecules, and cytokines. Mitochondria are an intracellular signaling organelle and energy plant, which supply the energy requirement of the immune system and maintain the system activation with the production of reactive oxygen species (ROS). Extracellular mitochondria can elicit regenerative effects or serve as an activator of the immune cells to eliminate the damaged cells. Recent clarification of the cytosolic escape of mitochondrial DNA triggering innate immunity underscores the pivotal role of mitochondria in inflammation-related diseases. Human mesenchymal stem cells could transfer mitochondria through nanotubular structures to defective mitochondrial DNA cells. In recent years, mitochondrial therapy has shown promise in treating heart ischemic events, Parkinson's disease, and fulminating hepatitis. Taken together, these results emphasize the emerging role of mitochondria in immune-cell-mediated tissue regeneration and ageing.
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Affiliation(s)
- Yu-Jih Su
- Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan
- College of Medicine, Chang Gung University, Kaohsiung 833, Taiwan
- Center for Mitochondrial Research and Medicine, Kaohsiung Chang Gung Memorial Hospital, 123, Dapi Road, Niaosong District, Kaohsiung 833, Taiwan; (Y.-J.S.); (P.-W.W.)
| | - Pei-Wen Wang
- Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan
- College of Medicine, Chang Gung University, Kaohsiung 833, Taiwan
- Center for Mitochondrial Research and Medicine, Kaohsiung Chang Gung Memorial Hospital, 123, Dapi Road, Niaosong District, Kaohsiung 833, Taiwan; (Y.-J.S.); (P.-W.W.)
| | - Shao-Wen Weng
- Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan
- College of Medicine, Chang Gung University, Kaohsiung 833, Taiwan
- Center for Mitochondrial Research and Medicine, Kaohsiung Chang Gung Memorial Hospital, 123, Dapi Road, Niaosong District, Kaohsiung 833, Taiwan; (Y.-J.S.); (P.-W.W.)
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22
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Dimasuay KG, Schaunaman N, Martin RJ, Pavelka N, Kolakowski C, Gottlieb RA, Holguin F, Chu HW. Parkin, an E3 ubiquitin ligase, enhances airway mitochondrial DNA release and inflammation. Thorax 2020; 75:717-724. [PMID: 32499407 DOI: 10.1136/thoraxjnl-2019-214158] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 04/23/2020] [Accepted: 05/04/2020] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Parkin (Park2), an E3 ubiquitin ligase, is critical to maintain mitochondrial function by regulating mitochondrial biogenesis and degradation (mitophagy), but recent evidence suggests the involvement of Parkin in promoting inflammation. In the present study, we determined if Parkin regulates airway mitochondrial DNA (mtDNA) release and inflammatory responses to type 2 cytokine interleukin (IL)-13 and allergens. METHODS We measured Parkin mRNA expression in brushed bronchial epithelial cells and mtDNA release in the paired bronchoalveolar lavage fluid (BALF) from normal subjects and asthmatics. Parkin-deficient primary human tracheobronchial epithelial (HTBE) cells generated using the CRISPR-Cas9 system were stimulated with IL-13. To determine the in vivo function of Parkin, Parkin knockout (PKO) and wild-type (WT) mice were treated with IL-13 or allergen (house dust mite, HDM) in the presence or absence of mtDNA isolated from normal mouse lungs. RESULTS Parkin mRNA expression in asthmatic airway epithelium was upregulated, which positively correlated with the levels of released mtDNA in BALF. IL-13-stimulated HTBE cells increased Parkin expression. Moreover, IL-13 induced mtDNA release in Parkin-sufficient, but not in Parkin-deficient HTBE cells. PKO (vs WT) mice attenuated airway mtDNA release and inflammation following IL-13 or HDM treatments. mtDNA amplified airway inflammation in mice treated with IL-13 or HDM. Notably, Parkin also mediated mtDNA-induced exacerbation of airway inflammation. CONCLUSION Our research findings suggest that Parkin promotes mtDNA release and inflammation in airways, thus improving our understanding of the complex role of Parkin and mitochondrial dysfunction in asthma pathogenesis.
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Affiliation(s)
| | | | - Richard J Martin
- Department of Medicine, National Jewish Health, Denver, Colorado, USA
| | - Nicole Pavelka
- Department of Medicine, National Jewish Health, Denver, Colorado, USA
| | | | - Roberta A Gottlieb
- The Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Fernando Holguin
- Division of Pulmonary and Critical Care, Department of Medicine, University of Colorado Denver - Anschutz Medical Campus, Aurora, Colorado, USA
| | - Hong Wei Chu
- Department of Medicine, National Jewish Health, Denver, Colorado, USA
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Guo Z, Tang N, Liu FY, Yang Z, Ma SQ, An P, Wu HM, Fan D, Tang QZ. TLR9 deficiency alleviates doxorubicin-induced cardiotoxicity via the regulation of autophagy. J Cell Mol Med 2020; 24:10913-10923. [PMID: 33140921 PMCID: PMC7521247 DOI: 10.1111/jcmm.15719] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 07/05/2020] [Accepted: 07/09/2020] [Indexed: 12/19/2022] Open
Abstract
Doxorubicin is a commonly used anthracycline chemotherapeutic drug. Its application for treatment has been impeded by its cardiotoxicity as it is detrimental and fatal. DNA damage, cardiac inflammation, oxidative stress and cell death are the critical links in DOX-induced myocardial injury. Previous studies found that TLR9-related signalling pathways are associated with the inflammatory response of cardiac myocytes, mitochondrial dysfunction and cardiomyocyte death, but it remains unclear whether TLR9 could influence DOX-induced heart injury. Our current data imply that DOX-induced cardiotoxicity is ameliorated by TLR9 deficiency both in vivo and in vitro, manifested as improved cardiac function and reduced cardiomyocyte apoptosis and oxidative stress. Furthermore, the deletion of TLR9 rescued DOX-induced abnormal autophagy flux in vivo and in vitro. However, the inhibition of autophagy by 3-MA abolished the protective effects of TLR9 deletion on DOX-induced cardiotoxicity. Moreover, TLR9 ablation suppressed the activation of p38 MAPK during DOX administration and may promote autophagy via the TLR9-p38 MAPK signalling pathway. Our study suggests that the deletion of TLR9 exhibits a protective effect on doxorubicin-induced cardiotoxicity by enhancing p38-dependent autophagy. This finding could be used as a basis for the development of a prospective therapy against DOX-induced cardiotoxicity.
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Affiliation(s)
- Zhen Guo
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Nan Tang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Fang-Yuan Liu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Zheng Yang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Shu-Qing Ma
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Peng An
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Hai-Ming Wu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Di Fan
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
| | - Qi-Zhu Tang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.,Hubei Key Laboratory of Metabolic and Chronic Diseases, Wuhan, China.,Cardiovascular Research Institute of Wuhan University, Wuhan, China
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24
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Bueno M, Calyeca J, Rojas M, Mora AL. Mitochondria dysfunction and metabolic reprogramming as drivers of idiopathic pulmonary fibrosis. Redox Biol 2020; 33:101509. [PMID: 32234292 PMCID: PMC7251240 DOI: 10.1016/j.redox.2020.101509] [Citation(s) in RCA: 105] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/13/2020] [Accepted: 03/16/2020] [Indexed: 02/07/2023] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is a devastating lung disease of unknown etiology. It is characterized by deposition of extracellular matrix proteins, like collagen and fibronectin in the lung interstitium leading to respiratory failure. Our understanding of the pathobiology underlying IPF is still incomplete; however, it is accepted that aging is a major risk factor in the disease while growing evidence suggests that the mitochondria plays an important role in the initiation and progression of pulmonary fibrosis. Mitochondria dysfunction and metabolic reprogramming had been identified in different IPF lung cells (alveolar epithelial cells, fibroblasts, and macrophages) promoting low resilience and increasing susceptibility to activation of profibrotic responses. Here we summarize changes in mitochondrial numbers, biogenesis, turnover and associated metabolic adaptations that promote disrepair and fibrosis in the lung. Finally, we highlight new possible therapeutic approaches focused on ameliorate mitochondrial dysfunction.
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Affiliation(s)
- Marta Bueno
- Aging Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Division of Pulmonary Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Vascular Medicine Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Jazmin Calyeca
- Aging Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Mauricio Rojas
- Division of Pulmonary Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Dorothy and Richard Simmons Center for Interstitial Lung Diseases, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Ana L Mora
- Aging Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Division of Pulmonary Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Vascular Medicine Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
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25
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New Insights into the Implication of Mitochondrial Dysfunction in Tissue, Peripheral Blood Mononuclear Cells, and Platelets during Lung Diseases. J Clin Med 2020; 9:jcm9051253. [PMID: 32357474 PMCID: PMC7287602 DOI: 10.3390/jcm9051253] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 04/16/2020] [Accepted: 04/20/2020] [Indexed: 12/13/2022] Open
Abstract
Lung diseases such as chronic obstructive pulmonary disease, asthma, pulmonary arterial hypertension, or idiopathic pulmonary fibrosis are major causes of morbidity and mortality. Complex, their physiopathology is multifactorial and includes lung mitochondrial dysfunction and enhanced reactive oxygen species (ROS) release, which deserves increased attention. Further, and importantly, circulating blood cells (peripheral blood mononuclear cells-(PBMCs) and platelets) likely participate in these systemic diseases. This review presents the data published so far and shows that circulating blood cells mitochondrial oxidative capacity are likely to be reduced in chronic obstructive pulmonary disease (COPD), but enhanced in asthma and pulmonary arterial hypertension in a context of increased oxidative stress. Besides such PBMCs or platelets bioenergetics modifications, mitochondrial DNA (mtDNA) changes have also been observed in patients. These new insights open exciting challenges to determine their role as biomarkers or potential guide to a new therapeutic approach in lung diseases.
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26
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Mallavia B, Liu F, Lefrançais E, Cleary SJ, Kwaan N, Tian JJ, Magnen M, Sayah DM, Soong A, Chen J, Saggar R, Shino MY, Ross DJ, Derhovanessian A, Lynch JP, Ardehali A, Weigt SS, Belperio JA, Hays SR, Golden JA, Leard LE, Shah RJ, Kleinhenz ME, Venado A, Kukreja J, Singer JP, Looney MR. Mitochondrial DNA Stimulates TLR9-Dependent Neutrophil Extracellular Trap Formation in Primary Graft Dysfunction. Am J Respir Cell Mol Biol 2020; 62:364-372. [PMID: 31647878 PMCID: PMC7055700 DOI: 10.1165/rcmb.2019-0140oc] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 10/24/2019] [Indexed: 12/14/2022] Open
Abstract
The immune system is designed to robustly respond to pathogenic stimuli but to be tolerant to endogenous ligands to not trigger autoimmunity. Here, we studied an endogenous damage-associated molecular pattern, mitochondrial DNA (mtDNA), during primary graft dysfunction (PGD) after lung transplantation. We hypothesized that cell-free mtDNA released during lung ischemia-reperfusion triggers neutrophil extracellular trap (NET) formation via TLR9 signaling. We found that mtDNA increases in the BAL fluid of experimental PGD (prolonged cold ischemia followed by orthotopic lung transplantation) and not in control transplants with minimal warm ischemia. The adoptive transfer of mtDNA into the minimal warm ischemia graft immediately before lung anastomosis induces NET formation and lung injury. TLR9 deficiency in neutrophils prevents mtDNA-induced NETs, and TLR9 deficiency in either the lung donor or recipient decreases NET formation and lung injury in the PGD model. Compared with human lung transplant recipients without PGD, severe PGD was associated with high levels of BAL mtDNA and NETs, with evidence of relative deficiency in DNaseI. We conclude that mtDNA released during lung ischemia-reperfusion triggers TLR9-dependent NET formation and drives lung injury. In PGD, DNaseI therapy has a potential dual benefit of neutralizing a major NET trigger (mtDNA) in addition to dismantling pathogenic NETs.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Abbas Ardehali
- Department of Surgery, University of California, Los Angeles, Los Angeles, California
| | | | | | | | | | | | | | | | | | | | | | - Mark R. Looney
- Department of Medicine
- Department of Laboratory Medicine, University of California, San Francisco, San Francisco, California; and
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27
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Tanaka R, Umemura M, Narikawa M, Hikichi M, Osaw K, Fujita T, Yokoyama U, Ishigami T, Tamura K, Ishikawa Y. Reactive fibrosis precedes doxorubicin-induced heart failure through sterile inflammation. ESC Heart Fail 2020; 7:588-603. [PMID: 31984667 PMCID: PMC7160475 DOI: 10.1002/ehf2.12616] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 12/06/2019] [Accepted: 12/22/2019] [Indexed: 12/14/2022] Open
Abstract
Aims Doxorubicin (DOX)‐induced heart failure has a poor prognosis, and effective treatments have not been established. Because DOX shows cumulative cardiotoxicity, we hypothesized that minimal cardiac remodelling occurred at the initial stage in activating cardiac fibroblasts. Our aim was to investigate the initial pathophysiology of DOX‐exposed cardiac fibroblasts and propose prophylaxis. Methods and results An animal study was performed using a lower dose of DOX (4 mg/kg/week for 3 weeks, i.p.) than a toxic cumulative dose. Histological analysis was performed with terminal deoxynucleotidyl transferase‐mediated dUTP nick‐end labelling assay, picrosirius red staining, and immunohistochemical staining. The mechanism was analysed in vitro with a low dose of DOX, which did not induce cell apoptosis. Microarray analysis was performed. Differentially expressed genes were confirmed by enrichment analysis. Mitochondrial damage was assessed by mitochondrial membrane potential. The production of inflammatory cytokines and fibrosis markers was assessed by western blot, quantitative polymerase chain reaction, and ELISA. A phosphokinase antibody array was performed to detect related signalling pathways. Low‐dose DOX did not induced cell death, and fibrosis was localized to the perivascular area in mice. Microarray analysis suggested that DOX induced genes associated with the innate immune system and inflammatory reactions, resulting in cardiac remodelling. DOX induced mitochondrial damage and increased the expression of interleukin‐1. DOX also promoted the expression of fibrotic markers, such as alpha smooth muscle actin and galectin‐3. These responses were induced through stress‐activated protein kinase/c‐Jun NH2‐terminal kinase signalling. A peroxisome proliferator‐activated receptor (PPARγ) agonist attenuated the expression of fibrotic markers through suppressing stress‐activated protein kinase/c‐Jun NH2‐terminal kinase. Furthermore, this molecule also suppressed DOX‐induced early fibrotic responses in vivo. Conclusions Low‐dose DOX provoked reactive fibrosis through sterile inflammation evoked by the damaged mitochondria.
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Affiliation(s)
- Ryo Tanaka
- Cardiovascular Research Institute, Yokohama City University School of Medicine, Yokohama, Japan.,Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
| | - Masanari Umemura
- Cardiovascular Research Institute, Yokohama City University School of Medicine, Yokohama, Japan.,Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
| | - Masatoshi Narikawa
- Cardiovascular Research Institute, Yokohama City University School of Medicine, Yokohama, Japan.,Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
| | - Mayu Hikichi
- Cardiovascular Research Institute, Yokohama City University School of Medicine, Yokohama, Japan
| | - Kohei Osaw
- Cardiovascular Research Institute, Yokohama City University School of Medicine, Yokohama, Japan
| | - Takayuki Fujita
- Cardiovascular Research Institute, Yokohama City University School of Medicine, Yokohama, Japan.,Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
| | - Utako Yokoyama
- Department of Physiology, Tokyo Medical University, Tokyo, Japan
| | - Tomoaki Ishigami
- Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
| | - Kouichi Tamura
- Medical Science and Cardiorenal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
| | - Yoshihiro Ishikawa
- Cardiovascular Research Institute, Yokohama City University School of Medicine, Yokohama, Japan
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28
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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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29
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Exosomal miRNA Let-7 from Menstrual Blood-Derived Endometrial Stem Cells Alleviates Pulmonary Fibrosis through Regulating Mitochondrial DNA Damage. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:4506303. [PMID: 31949877 PMCID: PMC6948326 DOI: 10.1155/2019/4506303] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/19/2019] [Accepted: 11/25/2019] [Indexed: 01/16/2023]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a prototype of chronic, progressive, and fibrotic lung disease with high morbidity and high mortality. Menstrual blood-derived stem cells (MenSCs) have proven to be an attractive tool for the treatment of acute lung injury and fibrosis-related diseases through immunosuppression and antifibrosis. However, whether MenSC-derived exosomes have the similar function on pulmonary fibrosis remains unclear. In the present study, exosomes secreted from MenSCs (MenSCs-Exo) were verified by transmission electron microscope (TEM), nanoparticle tracking analyzer (NTA), and western blotting. And MenSC-Exo addition significantly improved BLM-induced lung fibrosis and alveolar epithelial cell damage in mice, mainly reflected in BLM-mediated enhancement of the fibrosis score, blue collagen deposition, dry/wet gravity ratio, hydroxyproline and malondialdehyde levels, and downregulation of glutathione peroxidase, which were all robustly reversed by MenSC-Exo management. Additionally, BLM- and TGF-β1-evoked cellular reactive oxygen species (ROS), mitochondrial DNA (mtDNA) damage, and cell apoptosis were rescued by MenSCs-Exo in vivo and in vitro. Further study indicated that the MenSCs-Exo could transport miRNA Let-7 into recipient alveolar epithelial cells. Let-7 inhibitor administration significantly blocked the exosome-mediated improvement role on lung fibrosis in mice. Mechanistically, Let-7 was able to regulate the expression of lectin-like oxidized low-density lipoprotein receptor-1 (LOX1) through binding to its 3′-UTR region. Forced expression of LOX1 promoted the expression of apoptosis-related protein and mtDNA damage markers via regulating NLRP3 which was also confirmed in BLM model mice under the combination therapy of the exosome and Let-7 inhibitor. Collectively, this study demonstrates that exosomal Let-7 from MenSCs remits pulmonary fibrosis through regulating ROS, mtDNA damage, and NLRP3 inflammasome activation. This provides a new approach of exocytosis on the treatment of fibrotic lung disease.
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30
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Bailey KL, Wyatt TA, Katafiasz DM, Taylor KW, Heires AJ, Sisson JH, Romberger DJ, Burnham EL. Alcohol and cannabis use alter pulmonary innate immunity. Alcohol 2019; 80:131-138. [PMID: 30419300 DOI: 10.1016/j.alcohol.2018.11.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 10/19/2018] [Accepted: 11/03/2018] [Indexed: 11/30/2022]
Abstract
PURPOSE Cannabis use is increasing due to recent legislative changes. In addition, cannabis is often used in conjunction with alcohol. The airway epithelium is the first line of defense against infectious microbes. Toll-like receptors (TLR) recognize airborne microbes and initiate the inflammatory cytokine response. The mechanism by which cannabis use in conjunction with alcohol affects pulmonary innate immunity mediated by TLRs is unknown. METHODS Samples and data from an existing cohort of individuals with alcohol use disorders (AUDs), along with samples from additional participants with cannabis use alone and with AUD were utilized. Subjects were categorized into the following groups: no alcohol use disorder (AUD) or cannabis use (control) (n = 46), AUD only (n = 29), cannabis use-only (n = 39), and AUD and cannabis use (n = 29). The participants underwent bronchoscopy with bronchoalveolar lavage (BAL) and airway epithelial brushings. We measured IL-6, IL-8, TNF⍺, and IL-10 levels in BAL fluid, and performed real-time PCR for TLR1-9 on the airway epithelial brushings. RESULTS We found significant increases in TLR2 with AUD alone, cannabis use alone, and cannabis use with AUD, compared to control. TLR5 was increased in cannabis users compared to control, TLR6 was increased in cannabis users and cannabis users with AUD compared to control, TLR7 was increased in cannabis users compared to control, and TLR9 was increased in cannabis users compared to control. In terms of cytokine production, IL-6 was increased in cannabis users compared to control. IL-8 and IL-10 were increased in AUD only. CONCLUSIONS AUD and cannabis use have complex effects on pulmonary innate immunity that promote airway inflammation.
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Affiliation(s)
- Kristina L Bailey
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States; Veterans Affairs, Nebraska Western-Iowa Healthcare System, Omaha, NE 68105, United States.
| | - Todd A Wyatt
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States; Veterans Affairs, Nebraska Western-Iowa Healthcare System, Omaha, NE 68105, United States; Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Dawn M Katafiasz
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Keenan W Taylor
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Art J Heires
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Joseph H Sisson
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Debra J Romberger
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States; Veterans Affairs, Nebraska Western-Iowa Healthcare System, Omaha, NE 68105, United States
| | - Ellen L Burnham
- University of Colorado, Anschutz Medical Campus, Aurora, CO 80045, United States
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31
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Wu G, Zhu Q, Zeng J, Gu X, Miao Y, Xu W, Lv T, Song Y. Extracellular mitochondrial DNA promote NLRP3 inflammasome activation and induce acute lung injury through TLR9 and NF-κB. J Thorac Dis 2019; 11:4816-4828. [PMID: 31903272 DOI: 10.21037/jtd.2019.10.26] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Background Extracellular mitochondrial DNA (mtDNA) was demonstrated to be capable of inducing pulmonary inflammation through TLR9 while its role in NLRP3 inflammation activation remains unknown. Methods C57BL/6 mice were challenged intratracheally with mtDNA. Pulmonary pathology, the NLRP3 and caspase-1 p20 in lung tissues were assayed. PMA-primed THP-1 macrophages were incubated with mtDNA in vitro and cell-free medium were concentrated to detect caspase-1 p20 subunit and NLRP3 by Western blotting. Additionally, IL-1β, L-18, TNF-α and caspase-1 activity in culture were also analyzed by ELISA kits and activity assay kit. Results Intratracheal administration of mtDNA increased NLRP3 and caspase-1 p20 subunit in lung together with excessive inflammation and damage. Inhibition of caspase-1 substantially diminished mtDNA-induced lung injury and inflammation. Exposed to mtDNA in THP-1 macrophages resulted in significant up-regulation of NLRP3 and increased caspase-1 p20 subunit release in culture. It also led to significant increased transcripts of NLRP3, ASC, caspase-1 and release of IL-1β, IL-18 and TNF-α in culture media. Futhermore, mtDNA exposure resulted in significant up-regulation of phosho -p38 MAPK and nucleus translocation of NF-κB. mtDNA-induced Transcripts of NLRP3 and ASC were inhibited by p38 siRNA inhibitor or NF-κB inhibitor. Conclusions Extracellular mtDNA promote NLRP3 inflammasome activation, acute pulmonary inflammation and injury through TLR9, p38 MAPK and NF-κB pathways.
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Affiliation(s)
- Guannan Wu
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China
| | - Qingqing Zhu
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China
| | - Junli Zeng
- Department of Respiratory Medicine, Jinling Hospital, Southern Medical University (Guangzhou), Nanjing 210002, China
| | - Xiaoling Gu
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China
| | - Yingying Miao
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China
| | - Wujian Xu
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China
| | - Tangfeng Lv
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China
| | - Yong Song
- Department of Respiratory Medicine, Jinling Hospital, Nanjing University School of Medicine, Nanjing 210002, China.,Department of Respiratory Medicine, Jinling Hospital, Southern Medical University (Guangzhou), Nanjing 210002, China
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32
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Extracellular Mitochondrial DNA and N-Formyl Peptides in Trauma and Critical Illness: A Systematic Review. Crit Care Med 2019; 46:2018-2028. [PMID: 30113320 DOI: 10.1097/ccm.0000000000003381] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
OBJECTIVES Extracellular mitochondrial DNA and N-formyl peptides released following tissue damage may contribute to systemic inflammation through stimulation of the innate immune system. In this review, we evaluate existing in vivo human data regarding a role for mitochondrial DNA and N-formyl peptides in producing systemic inflammation in trauma and critical illness, investigate the utility of these molecules in risk prediction and clinical decision support, and provide suggestions for standardization of future research. DATA SOURCES PubMed, Embase (1971-2017). STUDY SELECTION Studies measuring extracellular mitochondrial DNA and/or N-formyl peptides in acutely ill patients. DATA EXTRACTION Fifty-four studies were analyzed. Data extracted included article characteristics, methods, results, and performance in clinical prediction. DATA SYNTHESIS The most common patient types investigated were trauma (19 studies) and sepsis (eight). In studies comparing patient mitochondrial DNA or N-formyl peptide levels to healthy controls, 38 (90.5%) reported significantly elevated mitochondrial DNA levels in patients at first reported time point, as did the one study making this comparison for N-formyl peptides. Nine studies (81.8%) reported significantly elevated plasma/serum mitochondrial DNA levels in at least one time point in patients who developed inflammatory complications of their primary pathology compared with patients without inflammatory complications. For the ability of mitochondrial DNA to predict complications or outcomes, the area under the curve was 0.7 or greater in 84.6% of receiver operating characteristic curves, and 92.9% of odds, adjusted odds, risk, and hazard ratios were statistically significant. CONCLUSIONS Extracellular mitochondrial DNA levels are elevated early in patients' hospital courses in many acute illnesses and are higher in patients who develop inflammatory complications. Elevated mitochondrial DNA levels may be clinically useful in risk prediction and clinical decision support systems. Further research is needed to determine the role of extracellular N-formyl peptides in systemic inflammation and their possible clinical utility.
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33
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Ryu C, Brandsdorfer C, Adams T, Hu B, Kelleher DW, Yaggi M, Manning EP, Walia A, Reeves B, Pan H, Winkler J, Minasyan M, Dela Cruz CS, Kaminski N, Gulati M, Herzog EL. Plasma mitochondrial DNA is associated with extrapulmonary sarcoidosis. Eur Respir J 2019; 54:13993003.01762-2018. [PMID: 31273041 DOI: 10.1183/13993003.01762-2018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 05/27/2019] [Indexed: 12/18/2022]
Abstract
Sarcoidosis is an unpredictable granulomatous disease in which African Americans disproportionately experience aggressive phenotypes. Mitochondrial DNA (mtDNA) released by cells in response to various stressors contributes to tissue remodelling and inflammation. While extracellular mtDNA has emerged as a biomarker in multiple diseases, its relevance to sarcoidosis remains unknown. We aimed to define an association between extracellular mtDNA and clinical features of sarcoidosis.Extracellular mtDNA concentrations were measured using quantitative PCR for the human MT-ATP6 gene in bronchoalveolar (BAL) and plasma samples from healthy controls and patients with sarcoidosis from The Yale Lung Repository; associations between MT-ATP6 concentrations and Scadding stage, extrapulmonary disease and demographics were sought. Results were validated in the Genomic Research in Alpha-1 Antitrypsin Deficiency and Sarcoidosis cohort.Relative to controls, MT-ATP6 concentrations in sarcoidosis subjects were robustly elevated in the BAL fluid and plasma, particularly in the plasma of patients with extrapulmonary disease. Relative to Caucasians, African Americans displayed excessive MT-ATP6 concentrations in the BAL fluid and plasma, for which the latter compartment correlated with significantly higher odds of extrapulmonary disease.Enrichments in extracellular mtDNA in sarcoidosis are associated with extrapulmonary disease and African American descent. Further study into the mechanistic basis of these clinical findings may lead to novel pathophysiologic and therapeutic insights.
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Affiliation(s)
- Changwan Ryu
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Caitlin Brandsdorfer
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Taylor Adams
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Buqu Hu
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Dylan W Kelleher
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Madeleine Yaggi
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Edward P Manning
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Anjali Walia
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Benjamin Reeves
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Hongyi Pan
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Julia Winkler
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Maksym Minasyan
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Charles S Dela Cruz
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Naftali Kaminski
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Mridu Gulati
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA.,Equal contribution
| | - Erica L Herzog
- Section of Pulmonary, Critical Care and Sleep Medicine, Yale School of Medicine, New Haven, CT, USA .,Equal contribution
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Hotz MJ, Qing D, Shashaty MGS, Zhang P, Faust H, Sondheimer N, Rivella S, Worthen GS, Mangalmurti NS. Red Blood Cells Homeostatically Bind Mitochondrial DNA through TLR9 to Maintain Quiescence and to Prevent Lung Injury. Am J Respir Crit Care Med 2019; 197:470-480. [PMID: 29053005 DOI: 10.1164/rccm.201706-1161oc] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
RATIONALE Potentially hazardous CpG-containing cell-free mitochondrial DNA (cf-mtDNA) is routinely released into the circulation and is associated with morbidity and mortality in critically ill patients. How the body avoids inappropriate innate immune activation by cf-mtDNA remains unknown. Because red blood cells (RBCs) modulate innate immune responses by scavenging chemokines, we hypothesized that RBCs may attenuate CpG-induced lung inflammation through direct scavenging of CpG-containing DNA. OBJECTIVES To determine the mechanisms of CpG-DNA binding to RBCs and the effects of RBC-mediated DNA scavenging on lung inflammation. METHODS mtDNA on murine RBCs was measured under basal conditions and after systemic inflammation. mtDNA content on human RBCs from healthy control subjects and trauma patients was measured. Toll-like receptor 9 (TLR9) expression on RBCs and TLR9-dependent binding of CpG-DNA to RBCs were determined. A murine model of RBC transfusion after CpG-DNA-induced lung injury was used to investigate the role of RBC-mediated DNA scavenging in mitigating lung injury in vivo. MEASUREMENTS AND MAIN RESULTS Under basal conditions, RBCs bind CpG-DNA. The plasma-to-RBC mtDNA ratio is low in naive mice and in healthy volunteers but increases after systemic inflammation, demonstrating that the majority of cf-mtDNA is RBC-bound under homeostatic conditions and that the unbound fraction increases during inflammation. RBCs express TLR9 and bind CpG-DNA through TLR9. Loss of TLR9-dependent RBC-mediated CpG-DNA scavenging increased lung injury in vivo. CONCLUSIONS RBCs homeostatically bind mtDNA, and RBC-mediated DNA scavenging is essential in mitigating lung injury after CpG-DNA. Our data suggest a role for RBCs in regulating lung inflammation during disease states where cf-mtDNA is elevated, such as sepsis and trauma.
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Affiliation(s)
| | | | | | - Peggy Zhang
- 1 Pulmonary, Allergy and Critical Care Division and
| | - Hilary Faust
- 1 Pulmonary, Allergy and Critical Care Division and
| | - Neal Sondheimer
- 2 Department of Paediatrics, University of Toronto, Toronto, Ontario, Canada; and
| | | | - G Scott Worthen
- 5 Penn Center for Pulmonary Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,4 Division of Neonatology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Nilam S Mangalmurti
- 1 Pulmonary, Allergy and Critical Care Division and.,5 Penn Center for Pulmonary Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
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35
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Inhibition of TLR9 attenuates skeletal muscle fibrosis in aged sarcopenic mice via the p53/SIRT1 pathway. Exp Gerontol 2019; 122:25-33. [PMID: 31003004 DOI: 10.1016/j.exger.2019.04.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 04/03/2019] [Accepted: 04/15/2019] [Indexed: 01/08/2023]
Abstract
Sarcopenia is an age-related syndrome characterized by a gradual loss of muscle mass and function, but its pathophysiological mechanism remains unclear. Skeletal muscle extracellular matrix (ECM) remodeling is an important pathological change in sarcopenia, and fibrosis is the most obvious manifestation of this change. We found that the expression of the immunoreceptor Toll-like receptor 9 (TLR9) is significantly increased in skeletal muscle in aged mice and is positively related to muscle fibrosis. Moreover, in previous reports, the longevity gene Sirt1 was reported to attenuate ECM deposition and improve muscle function. In this study, we hypothesized that TLR9 modulated skeletal muscle fibrosis via Sirt1. We used TLR9 knockout (TLR9 KO) mice and C57 mice, and grip strength and body composition were compared at different ages. We found that TLR9 knockout significantly attenuated skeletal muscle fibrosis and improved muscle function in aged mice. Furthermore, silent information regulator 1 (Sirt1) activity in mice was inhibited by Ex527, which is a specific inhibitor of Sirt1. Negative Sirt1 regulation via the activation of TLR9-related signaling pathways participated in skeletal muscle fibrosis in the sarcopenic mice, and this process might mediated by the Sirt1/Smad signaling pathway. Our findings revealed that fibrosis changes in the gastrocnemius muscle in sarcopenic mice are closely related to TLR9 activation, and TLR9 modulation could be a therapeutic strategy for combating sarcopenia during aging.
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36
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Hu X, Chandler JD, Park S, Liu K, Fernandes J, Orr M, Smith MR, Ma C, Kang SM, Uppal K, Jones DP, Go YM. Low-dose cadmium disrupts mitochondrial citric acid cycle and lipid metabolism in mouse lung. Free Radic Biol Med 2019; 131:209-217. [PMID: 30529385 PMCID: PMC6331287 DOI: 10.1016/j.freeradbiomed.2018.12.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 11/30/2018] [Accepted: 12/05/2018] [Indexed: 12/12/2022]
Abstract
Cadmium (Cd) causes acute and chronic lung toxicities at occupational exposure levels, yet the impacts of Cd exposure at low levels through dietary intake remain largely uncharacterized. Health concerns arise because humans do not have an effective Cd elimination mechanism, resulting in a long (10- to 35-y) biological half-life. Previous studies showed increased mitochondrial oxidative stress and cell death by Cd yet the details of mitochondrial alterations by low levels of Cd remain unexplored. In the current study, we examined the impacts of Cd burden at a low environmental level on lung metabolome, redox proteome, and inflammation in mice given Cd at low levels by drinking water (0, 0.2, 0.6 and 2.0 mg Cd/L) for 16 weeks. The results showed that mice accumulated lung Cd comparable to non-smoking humans and showed inflammation in lung by histopathology at 2 mg Cd/L. The results of high resolution metabolomics combined with bioinformatics showed that mice treated with 2 mg Cd/L increased levels of lipids in the lung, accompanied by disruption in mitochondrial energy metabolism. In addition, targeted metabolomic analysis showed that these mice had increased accumulation of mitochondrial carnitine and citric acid cycle intermediates. The results of redox proteomics showed that Cd at 2 mg/L stimulated oxidation of isocitrate dehydrogenase, malate dehydrogenase and ATP synthase. Taken together, the results showed impaired mitochondrial function and accumulation of lipids in the lung with a Cd dose response relevant to non-smokers without occupational exposures. These findings suggest that dietary Cd intake could be an important variable contributing to human pulmonary disorders.
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Affiliation(s)
- Xin Hu
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - Joshua D Chandler
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - Soojin Park
- Georgia State University, Atlanta, GA, United States
| | - Ken Liu
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - Jolyn Fernandes
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - Michael Orr
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - M Ryan Smith
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - Chunyu Ma
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - Sang-Moo Kang
- Georgia State University, Atlanta, GA, United States
| | - Karan Uppal
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States
| | - Dean P Jones
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States.
| | - Young-Mi Go
- Division of Pulmonary Medicine, Department of Medicine, Emory University, United States.
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Current and Emerging Evidence for Toll-Like Receptor Activation in Sjögren's Syndrome. J Immunol Res 2018; 2018:1246818. [PMID: 30671484 PMCID: PMC6317121 DOI: 10.1155/2018/1246818] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 10/30/2018] [Indexed: 02/06/2023] Open
Abstract
While the importance of Toll-like receptor (TLR) signaling is well established in many autoimmune diseases, the role of TLR activation in Sjögren's syndrome (SS) is poorly understood. Studies in mice and humans reveal that TLRs are potent mediators of inflammation in SS. TLRs are expressed and functional in salivary tissue, and TLRs in peripheral blood cells of SS patients are also upregulated and hyperresponsive to ligation. In this review, we will detail observations in mouse models regarding the importance of TLR activation in both local and systemic disease. We will then discuss studies in SS patients that provide evidence of the importance of TLR-mediated signaling in disease. While the ligands that activate TLRs in the context of SS are unknown, emerging data suggest that damage-associated molecular patterns (DAMPs) may be significant drivers of the chronic and unremitting inflammation that is characteristic of SS. We will discuss putative DAMPs that may be of clinical significance in disease. Therapies that target TLR signaling cascades will likely reduce both exocrine-specific and systemic manifestations of SS.
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38
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Plasma mtDNA Analysis Aids in Predicting Pancreatic Necrosis in Acute Pancreatitis Patients: A Pilot Study. Dig Dis Sci 2018; 63:2975-2982. [PMID: 30094625 DOI: 10.1007/s10620-018-5227-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 07/26/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND Specific plasma biomarkers in predicting pancreatic necrosis (PNec) are needed in treating acute pancreatitis (AP). AIMS To investigate the prognostic value of plasma mitochondrial DNA fragments (mtDNA) in patient with AP for PNec. METHODS AP patients with symptoms onset within 72 h were prospectively enrolled from June 2015 through June 2017 and were assessed for PNec using contrast-enhanced CT scan. Plasma mtDNA concentration (specific mitochondrial gene ND1) was measured using qRT-PCR. RESULTS Of the 74 AP patients included, significant higher median level of plasma mtDNA was found in severe AP patients than in mild AP patients and healthy controls, but not in moderately severe AP patients. Patients with PNec had higher level of plasma mtDNA than those without PNec (774.2 [IQR 397.6-2205.0] vs. 169.5 [IQR 73.6-683.4] pg/ml, P < 0.05). The area under the receiver operator characteristic curve (ROC-AUC) of mtDNA for predicting PNec was higher than that of CRP (0.813 [95% CI 0.705-0.895] vs. 0.678 [95% CI 0.558-0.783]). Using a cutoff value of 302.5 pg/ml, the sensitivity and specificity for diagnosing PNec were 90.9 and 68.3%, respectively. Finally, plasma mtDNA levels decreased significantly after continuous renal replacement therapy (717.7 [IQR 307.00-1370.00] vs. 237.5 [IQR 117.20-464.80] pg/ml, P < 0.01). CONCLUSIONS Elevated plasma mtDNA content in AP patients may be used as a more accurate early predictor of PNec in contrast to traditional CRP.
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Lin JY, Jing R, Lin F, Ge WY, Dai HJ, Pan L. High Tidal Volume Induces Mitochondria Damage and Releases Mitochondrial DNA to Aggravate the Ventilator-Induced Lung Injury. Front Immunol 2018; 9:1477. [PMID: 30018615 PMCID: PMC6037891 DOI: 10.3389/fimmu.2018.01477] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2017] [Accepted: 06/13/2018] [Indexed: 01/19/2023] Open
Abstract
Objective This study aimed to determine whether high tidal volume (HTV) induce mitochondria damage and mitophagy, contributing to the release of mitochondrial DNA (mtDNA). Another aim of the present study was to investigate the role and mechanism of mtDNA in ventilator-induced lung injury (VILI) in rats. Methods Rats were tracheotomized and allowed to breathe spontaneously or mechanically ventilated for 4 h. After that, lung injury was assessed. Inhibition of toll-like receptor 9 (TLR9), named ODN2088, was used to determine the involvement of TLR9/myeloid differentiation factor 88 (MyD88)/nuclear factor-κB (NF-κB) signaling pathway in VILI. The mitochondrial damage and release of mtDNA were assessed. Pharmacological inhibition of mtDNA (chloroquine) was used to determine whether mtDNA trigger inflammation via TLR9 in VILI. EDU-labeled mtDNA deriving from mitophagy was assessed by immunofluorescence. The role of mitophagy in VILI was shown by administration of antimycin A and cyclosporine A. Main results Rats subjected to HTV showed more severe pulmonary edema and inflammation than the other rats. The decreased expression of TLR9, MyD88, and NF-κB were observed following the use of ODN2088. Mechanical ventilation (MV) with HTV damaged mitochondria which resulted in dysfunctional ATP synthesis, accumulation of reactive oxygen species, and loss of mitochondrial membrane potential. Moreover, the results of distribution of fluorescence in rats upon HTV stimulation indicated that mtDNA cleavage was associated with mitophagy. The expression levels of mitophagy related genes (LC3B-II/LC3B-I, PINK1, Parkin, and mitofusin 1) in animals ventilated with HTV were significantly upregulated. Administration of antimycin A aggregated the histological changes and inflammation after MV, but these effects were attenuated when administered in the presence of cyclosporine A. Conclusion MV with HTV induces mitochondrial damage and mitophagy, contributing to the release of mtDNA, which may be induced VILI in rat via TLR9/MyD88/NF-κB signaling pathway.
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Affiliation(s)
- Jin-Yuan Lin
- Department of Anesthesiology, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
| | - Ren Jing
- Department of Anesthesiology, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
| | - Fei Lin
- Department of Anesthesiology, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
| | - Wan-Yun Ge
- Department of Anesthesiology, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
| | - Hui-Jun Dai
- Department of Anesthesiology, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
| | - Linghui Pan
- Department of Anesthesiology, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
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40
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Zhao Y, Huang S, Liu J, Wu X, Zhou S, Dai K, Kou Y. Mitophagy Contributes to the Pathogenesis of Inflammatory Diseases. Inflammation 2018; 41:1590-1600. [DOI: 10.1007/s10753-018-0835-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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41
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Aswani A, Manson J, Itagaki K, Chiazza F, Collino M, Wupeng WL, Chan TK, Wong WSF, Hauser CJ, Thiemermann C, Brohi K. Scavenging Circulating Mitochondrial DNA as a Potential Therapeutic Option for Multiple Organ Dysfunction in Trauma Hemorrhage. Front Immunol 2018; 9:891. [PMID: 29867926 PMCID: PMC5951958 DOI: 10.3389/fimmu.2018.00891] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 04/10/2018] [Indexed: 12/15/2022] Open
Abstract
Trauma is a leading cause of death worldwide with 5.8 million deaths occurring yearly. Almost 40% of trauma deaths are due to bleeding and occur in the first few hours after injury. Of the remaining severely injured patients up to 25% develop a dysregulated immune response leading to multiple organ dysfunction syndrome (MODS). Despite improvements in trauma care, the morbidity and mortality of this condition remains very high. Massive traumatic injury can overwhelm endogenous homeostatic mechanisms even with prompt treatment. The underlying mechanisms driving MODS are also not fully elucidated. As a result, successful therapies for trauma-related MODS are lacking. Trauma causes tissue damage that releases a large number of endogenous damage-associated molecular patterns (DAMPs). Mitochondrial DAMPs released in trauma, such as mitochondrial DNA (mtDNA), could help to explain part of the immune response in trauma given the structural similarities between mitochondria and bacteria. MtDNA, like bacterial DNA, contains an abundance of highly stimulatory unmethylated CpG DNA motifs that signal through toll-like receptor-9 to produce inflammation. MtDNA has been shown to be highly damaging when injected into healthy animals causing acute organ injury to develop. Elevated circulating levels of mtDNA have been reported in trauma patients but an association with clinically meaningful outcomes has not been established in a large cohort. We aimed to determine whether mtDNA released after clinical trauma hemorrhage is sufficient for the development of MODS. Secondly, we aimed to determine the extent of mtDNA release with varying degrees of tissue injury and hemorrhagic shock in a clinically relevant rodent model. Our final aim was to determine whether neutralizing mtDNA with the nucleic acid scavenging polymer, hexadimethrine bromide (HDMBr), at a clinically relevant time point in vivo would reduce the severity of organ injury in this model. CONCLUSIONS We have shown that the release of mtDNA is sufficient for the development of multiple organ injury. MtDNA concentrations likely peak at different points in the early postinjury phase dependent on the degree of isolated trauma vs combined trauma and hemorrhagic shock. HDMBr scavenging of circulating mtDNA (and nuclear DNA, nDNA) is associated with rescue from severe multiple organ injury in the animal model. This suggests that HDMBr could have utility in rescue from human trauma-induced MODS.
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Affiliation(s)
- Andrew Aswani
- Department of Critical Care Medicine, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Joanna Manson
- Centre for Trauma Sciences, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Kiyoshi Itagaki
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States
| | - Fausto Chiazza
- Department of Drug Science and Technology, Università degli Studi di Torino, Turin, Italy
| | - Massimo Collino
- Department of Drug Science and Technology, Università degli Studi di Torino, Turin, Italy
| | - Winston Liao Wupeng
- Department of Pharmacology and Immunology Program, National University Health System, Singapore, Singapore
| | - Tze Khee Chan
- Department of Pharmacology and Immunology Program, National University Health System, Singapore, Singapore
| | - W S Fred Wong
- Department of Pharmacology and Immunology Program, National University Health System, Singapore, Singapore
| | - Carl J Hauser
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States
| | - Chris Thiemermann
- Department of Translational Medicine and Therapeutics, Queen Mary University of London, London, United Kingdom
| | - Karim Brohi
- Centre for Trauma Sciences, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
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Liu L, Liu Y, Xu B, Liu C, Jia Y, Liu T, Fang C, Wang W, Ren J, He Z, Men K, Liang X, Luo M, Shao B, Mao Y, Xiao H, Qian Z, Geng J, Dong B, Mi P, Jiang Y, Wei Y, Wei X. Negative regulation of cationic nanoparticle-induced inflammatory toxicity through the increased production of prostaglandin E2 via mitochondrial DNA-activated Ly6C + monocytes. Theranostics 2018; 8:3138-3152. [PMID: 29896308 PMCID: PMC5996362 DOI: 10.7150/thno.21693] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 04/13/2018] [Indexed: 02/05/2023] Open
Abstract
Rationale: Cationic nanocarriers present with well-known toxicities, including inflammatory toxicity, which limit their clinical application. How the cationic nanocarrier-induced inflammatory response is negatively regulated is unknown. Herein, we found that following a sublethal dose of cationic nanocarriers, the induced inflammatory response is characterized by early neutrophil infiltration and spontaneous resolution within 1 week. Methods: C57BL/6 mice were intravenously injected with a dosage of 1-100 mg/kg cationic DOTAP liposomes as well as other cationic materials. Cell necrosis was detected by flow cytometry. Release of mitochondrial DNA was quantified by qPCR via Taqman probes. Signal proteins were detected by Western blotting. PGE2 production in the supernatant was quantitated using an enzyme immunoassay (EIA). The infiltrated inflammatory cells were observed in WT mice, Ccr2-/- mice, Sting-/-mice and Tlr9-/-mice. Results: The early stage (24-48 h) inflammatory neutrophil infiltration was followed by an increasing percentage of monocytes; and, compared with WT mice, Ccr2-/- mice presented with more severe pulmonary inflammation. A previously uncharacterized population of regulatory monocytes expressing both inflammatory and immunosuppressive cytokines was identified in this model. The alteration in monocyte phenotype was directly induced by mtDNA release from cationic nanocarrier-induced necrotic cells via a STING- or TLR9-dependent pathway. Neutrophil activation was specifically inhibited by PGE2 from Ly6C+ inflammatory monocytes, and intravenous injections of dual-phenotype monocytes beneficially modified the immune response; this inhibitory effect was abolished after treatment with indomethacin. Moreover, we provide clear evidence that mitochondrial DNA activated Ly6C+ monocytes and increased PGE2 production through TLR9- or STING-mediated MAPK-NF-κB-COX2 pathways. Conclusion: Our findings suggest that Ly6C+ monocytes and mtDNA-induced Ly6C+ monocyte PGE2 production may be part of a feedback mechanism that contributes to the resolution of cationic nanocarrier-induced inflammatory toxicity and may have important implications for understanding nanoparticle biocompatibility and designing better, safer drug delivery systems.
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Grazioli S, Pugin J. Mitochondrial Damage-Associated Molecular Patterns: From Inflammatory Signaling to Human Diseases. Front Immunol 2018; 9:832. [PMID: 29780380 PMCID: PMC5946030 DOI: 10.3389/fimmu.2018.00832] [Citation(s) in RCA: 237] [Impact Index Per Article: 39.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 04/05/2018] [Indexed: 12/20/2022] Open
Abstract
Over the recent years, much has been unraveled about the pro-inflammatory properties of various mitochondrial molecules once they are leaving the mitochondrial compartment. On entering the cytoplasm or the extracellular space, mitochondrial DAMPs (also known as mitochondrial alarmins) can become pro-inflammatory and initiate innate and adaptive immune responses by activating cell surface and intracellular receptors. Current evidence indicates that uncontrolled and excessive release of mitochondrial DAMPs is associated with severity, has prognosis value in human diseases, and contributes to the dysregulated process observed in numerous inflammatory and autoimmune conditions, as well as in ischemic heart disease and cancer. Herein, we review that the expanding research field of mitochondrial DAMPs in innate immune responses and the current knowledge on the association between mitochondrial DAMPs and human diseases.
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Affiliation(s)
- Serge Grazioli
- Pediatric Intensive Care Unit, Department of Pediatrics, University Hospital of Geneva, University of Geneva, Geneva, Switzerland.,Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Jérôme Pugin
- Intensive Care Unit, Department of Anesthesiology, Faculty of Medicine, University Hospital of Geneva, University of Geneva, Geneva, Switzerland
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Kellner M, Noonepalle S, Lu Q, Srivastava A, Zemskov E, Black SM. ROS Signaling in the Pathogenesis of Acute Lung Injury (ALI) and Acute Respiratory Distress Syndrome (ARDS). ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 967:105-137. [PMID: 29047084 PMCID: PMC7120947 DOI: 10.1007/978-3-319-63245-2_8] [Citation(s) in RCA: 227] [Impact Index Per Article: 37.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The generation of reactive oxygen species (ROS) plays an important role for the maintenance of cellular processes and functions in the body. However, the excessive generation of oxygen radicals under pathological conditions such as acute lung injury (ALI) and its most severe form acute respiratory distress syndrome (ARDS) leads to increased endothelial permeability. Within this hallmark of ALI and ARDS, vascular microvessels lose their junctional integrity and show increased myosin contractions that promote the migration of polymorphonuclear leukocytes (PMNs) and the transition of solutes and fluids in the alveolar lumen. These processes all have a redox component, and this chapter focuses on the role played by ROS during the development of ALI/ARDS. We discuss the origins of ROS within the cell, cellular defense mechanisms against oxidative damage, the role of ROS in the development of endothelial permeability, and potential therapies targeted at oxidative stress.
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Affiliation(s)
- Manuela Kellner
- Department of Medicine, Center for Lung Vascular Pathobiology, University of Arizona, 1501 N Campbell Ave., Tucson, AZ, 85719, USA
| | - Satish Noonepalle
- Department of Medicine, Center for Lung Vascular Pathobiology, University of Arizona, 1501 N Campbell Ave., Tucson, AZ, 85719, USA
| | - Qing Lu
- Department of Medicine, Center for Lung Vascular Pathobiology, University of Arizona, 1501 N Campbell Ave., Tucson, AZ, 85719, USA
| | - Anup Srivastava
- Department of Medicine, Center for Lung Vascular Pathobiology, University of Arizona, 1501 N Campbell Ave., Tucson, AZ, 85719, USA
| | - Evgeny Zemskov
- Department of Medicine, Center for Lung Vascular Pathobiology, University of Arizona, 1501 N Campbell Ave., Tucson, AZ, 85719, USA
| | - Stephen M Black
- Department of Medicine, Center for Lung Vascular Pathobiology, University of Arizona, 1501 N Campbell Ave., Tucson, AZ, 85719, USA.
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Thurairajah K, Briggs GD, Balogh ZJ. The source of cell-free mitochondrial DNA in trauma and potential therapeutic strategies. Eur J Trauma Emerg Surg 2018; 44:325-334. [PMID: 29633007 PMCID: PMC6002458 DOI: 10.1007/s00068-018-0954-3] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 04/03/2018] [Indexed: 01/04/2023]
Abstract
Mitochondria play a key role in the pathophysiology of post-injury inflammation. Cell-free mitochondrial DNA (cf-mtDNA) is now understood to catalyse sterile inflammation after trauma. Observations in trauma cohorts have identified high cf-mtDNA in patients with systemic inflammatory response syndrome and multiple organ failure as well as following major surgery. The source of cf-mtDNA can be various cells affected by mechanical and hypoxic injury (passive mechanism) or induced by inflammatory mechanisms (active mechanism). Multiple forms of cf-mtDNA exist; mtDNA fragments, mtDNA in microparticles/vesicles and cell-free mitochondria. Trauma to cells that are rich in mitochondria are believed to release more cf-mtDNA. This review describes the current understanding of the mechanisms of cf-mtDNA release, its systemic effects and the potential therapeutic implications related to its modification. Although current understanding is insufficient to change trauma management, focussed research goals have been identified to pave the way for monitoring and manipulation of cf-mtDNA release and effects in trauma.
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Affiliation(s)
- Kabilan Thurairajah
- Department of Traumatology, John Hunter Hospital and University of Newcastle, Newcastle, NSW, Australia
| | - Gabrielle Daisy Briggs
- Department of Traumatology, John Hunter Hospital and University of Newcastle, Newcastle, NSW, Australia
| | - Zsolt Janos Balogh
- Department of Traumatology, John Hunter Hospital and University of Newcastle, Newcastle, NSW, Australia.
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Drakopanagiotakis F, Wujak L, Wygrecka M, Markart P. Biomarkers in idiopathic pulmonary fibrosis. Matrix Biol 2018; 68-69:404-421. [PMID: 29408012 DOI: 10.1016/j.matbio.2018.01.023] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 01/28/2018] [Accepted: 01/29/2018] [Indexed: 12/15/2022]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a chronic, debilitating, fibrotic lung disease leading to respiratory failure and ultimately to death. Being the prototype of interstitial lung diseases, IPF is characterized by marked heterogeneity regarding its clinical course. Despite significant progress in the understanding of its pathogenesis, we still cannot reliably predict the course of the disease and the response to treatment of an individual patient. Non-invasive biomarkers, in particular serum biomarkers, for the (early) diagnosis, differential diagnosis, prognosis and prediction of therapeutic response are urgently needed. Numerous molecules involved in alveolar epithelial cell injury, fibroproliferation and matrix remodeling as well as immune regulation have been proposed as potential biomarkers. Furthermore, genetic variants of TOLLIP, MUC5B, and other genes are associated with a differential response to treatment and with the development and/or the prognosis of IPF. Additionally, the bacterial signature in IPF lungs, as shown from microbiome analyses, as well as mitochondrial DNA seem to have promising roles as biomarkers. Moreover, combination of multiple biomarkers may identify comprehensive biomarker signatures in IPF patients. However, there is still a long way until these potential biomarkers complete or substitute for the clinical and functional parameters currently available for IPF.
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Affiliation(s)
- F Drakopanagiotakis
- Department of Pulmonary Medicine (Medical Clinic V), Fulda Hospital, University Medicine Marburg, Campus Fulda, Pacelliallee 4, 36043 Fulda, Germany
| | - Lukasz Wujak
- Department of Biochemistry, Faculty of Medicine, Universities of Giessen and Marburg Lung Center, Giessen, Germany
| | - Malgorzata Wygrecka
- Department of Biochemistry, Faculty of Medicine, Universities of Giessen and Marburg Lung Center, Giessen, Germany
| | - P Markart
- Department of Pulmonary Medicine (Medical Clinic V), Fulda Hospital, University Medicine Marburg, Campus Fulda, Pacelliallee 4, 36043 Fulda, Germany; Department of Internal Medicine, Faculty of Medicine, Universities of Giessen and Marburg Lung Center, Giessen, Germany.
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47
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Nerlich A, Mieth M, Letsiou E, Fatykhova D, Zscheppang K, Imai-Matsushima A, Meyer TF, Paasch L, Mitchell TJ, Tönnies M, Bauer TT, Schneider P, Neudecker J, Rückert JC, Eggeling S, Schimek M, Witzenrath M, Suttorp N, Hippenstiel S, Hocke AC. Pneumolysin induced mitochondrial dysfunction leads to release of mitochondrial DNA. Sci Rep 2018; 8:182. [PMID: 29317705 PMCID: PMC5760655 DOI: 10.1038/s41598-017-18468-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 12/12/2017] [Indexed: 01/01/2023] Open
Abstract
Streptococcus pneumoniae (S.pn.) is the most common bacterial pathogen causing community acquired pneumonia. The pore-forming toxin pneumolysin (PLY) is the major virulence factor of S.pn. and supposed to affect alveolar epithelial cells thereby activating the immune system by liberation of danger-associated molecular patterns (DAMP). To test this hypothesis, we established a novel live-cell imaging based assay to analyse mitochondrial function and associated release of mitochondrial DNA (mtDNA) as DAMP in real-time. We first revealed that bacterially released PLY caused significant changes of the cellular ATP homeostasis and led to morphologic alterations of mitochondria in human alveolar epithelial cells in vitro and, by use of spectral live-tissue imaging, in human alveoli. This was accompanied by strong mitochondrial calcium influx and loss of mitochondrial membrane potential resulting in opening of the mitochondrial permeability transition pore and mtDNA release without activation of intrinsic apoptosis. Moreover, our data indicate cellular mtDNA liberation via microvesicles, which may contribute to S.pn. related pro-inflammatory immune activation in the human alveolar compartment.
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Affiliation(s)
- Andreas Nerlich
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Maren Mieth
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Eleftheria Letsiou
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Diana Fatykhova
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Katja Zscheppang
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Aki Imai-Matsushima
- Department of Molecular Biology, Max Planck Institute for Infection Biology, Charitéplatz 1, 10117, Berlin, Germany
| | - Thomas F Meyer
- Department of Molecular Biology, Max Planck Institute for Infection Biology, Charitéplatz 1, 10117, Berlin, Germany
| | - Lisa Paasch
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Timothy J Mitchell
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15-2TT, UK
| | - Mario Tönnies
- Department of Pneumology and Department of Thoracic Surgery, HELIOS Clinic Emil von Behring, Walterhöferstr 11, 14165, Berlin, Germany
| | - Torsten T Bauer
- Department of Pneumology and Department of Thoracic Surgery, HELIOS Clinic Emil von Behring, Walterhöferstr 11, 14165, Berlin, Germany
| | - Paul Schneider
- Department for General and Thoracic Surgery, DRK Clinics, Drontheimer Strasse 39-40, 13359, Berlin, Germany
| | - Jens Neudecker
- Department of General, Visceral, Vascular and Thoracic Surgery, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Jens C Rückert
- Department of General, Visceral, Vascular and Thoracic Surgery, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Stephan Eggeling
- Department of Thoracic Surgery, Vivantes Clinics Neukölln, Rudower Straße 48, 12351, Berlin, Germany
| | - Maria Schimek
- Department of Thoracic Surgery, Vivantes Clinics Neukölln, Rudower Straße 48, 12351, Berlin, Germany
| | - Martin Witzenrath
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Norbert Suttorp
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Stefan Hippenstiel
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Andreas C Hocke
- Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany.
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48
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Zhang CX, Chen J, Cai L, Wu J, Wang JY, Cao LF, Zhou W, Chen TX. DNA induction of MDM2 promotes proliferation of human renal mesangial cells and alters peripheral B cells subsets in pediatric systemic lupus erythematosus. Mol Immunol 2018; 94:166-175. [PMID: 29324237 DOI: 10.1016/j.molimm.2018.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 12/11/2017] [Accepted: 01/04/2018] [Indexed: 02/06/2023]
Abstract
The study is aimed to investigate the role of MDM2 in the pathogenesis of lupus nephritis (LN) in pediatric SLE (pSLE). We confirmed that MDM2 expression was increased in peripheral blood mononuclear cells (PBMCs) as well as renal specimen of SLE compared with that of controls by western blot and immunofluorescence staining. Percentage of apoptotic and necrotic CD4+T, CD8+T and B cells were detected by flow cytometry respectively and levels of plasma cell free DNA (cfDNA) were quantified in SLE and healthy controls (HC). We also proved that elevated apoptotic and necrotic CD4+T cells were the main cause for increased plasma levels of cfDNA in pSLE. Additionally, upon DNA transfection MDM2 increased while P53 and P21 decreased in human renal mesangial cells (HRMC), with concomitant increase in proliferation rate and proportion of cells in S phase, as demonstrated by cell proliferation assay and cell cycle analysis. However, MDM2 inhibition reversed the trend. Furthermore, percentage of switched memory B cells decreased and proportion of double negative B cells increased upon blockage of MDM2 in PBMC. In summary, our study provided the first evidence that DNA induction of MDM2 promotes proliferation of HRMC and alters peripheral B cells subsets in pSLE. Thus our study has not only elucidated the pathogenesis of MDM2 in pediatric LN but also provided a novel target for drug development. In conclusion, our data suggested that apoptosis, cfDNA and MDM2 could form a pathological axis in SLE, especially in pSLE.
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Affiliation(s)
- Chen-Xing Zhang
- Department of Allergy and Immunology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Division of Immunology, Institute of Pediatric Translational Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Ji Chen
- Department of Dermatology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Li Cai
- Department of Allergy and Immunology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Division of Immunology, Institute of Pediatric Translational Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Jing Wu
- Division of Immunology, Institute of Pediatric Translational Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Jia-Yuan Wang
- Department of Laboratory Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Lan-Fang Cao
- Department of Pediatrics, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Wei Zhou
- Department of Nephrology and Rheumatology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Tong-Xin Chen
- Department of Allergy and Immunology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Department of Nephrology and Rheumatology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Division of Immunology, Institute of Pediatric Translational Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China.
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49
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Chernikov AV, Gudkov SV, Usacheva AM, Bruskov VI. Exogenous 8-oxo-7,8-dihydro-2′-deoxyguanosine: Biomedical properties, mechanisms of action, and therapeutic potential. BIOCHEMISTRY (MOSCOW) 2018. [DOI: 10.1134/s0006297917130089] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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50
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Ryu C, Sun H, Gulati M, Herazo-Maya JD, Chen Y, Osafo-Addo A, Brandsdorfer C, Winkler J, Blaul C, Faunce J, Pan H, Woolard T, Tzouvelekis A, Antin-Ozerkis DE, Puchalski JT, Slade M, Gonzalez AL, Bogenhagen DF, Kirillov V, Feghali-Bostwick C, Gibson K, Lindell K, Herzog RI, Dela Cruz CS, Mehal W, Kaminski N, Herzog EL, Trujillo G. Extracellular Mitochondrial DNA Is Generated by Fibroblasts and Predicts Death in Idiopathic Pulmonary Fibrosis. Am J Respir Crit Care Med 2017; 196:1571-1581. [PMID: 28783377 DOI: 10.1164/rccm.201612-2480oc] [Citation(s) in RCA: 121] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
RATIONALE Idiopathic pulmonary fibrosis (IPF) involves the accumulation of α-smooth muscle actin-expressing myofibroblasts arising from interactions with soluble mediators such as transforming growth factor-β1 (TGF-β1) and mechanical influences such as local tissue stiffness. Whereas IPF fibroblasts are enriched for aerobic glycolysis and innate immune receptor activation, innate immune ligands related to mitochondrial injury, such as extracellular mitochondrial DNA (mtDNA), have not been identified in IPF. OBJECTIVES We aimed to define an association between mtDNA and fibroblast responses in IPF. METHODS We evaluated the response of normal human lung fibroblasts (NHLFs) to stimulation with mtDNA and determined whether the glycolytic reprogramming that occurs in response to TGF-β1 stimulation and direct contact with stiff substrates, and spontaneously in IPF fibroblasts, is associated with excessive levels of mtDNA. We measured mtDNA concentrations in bronchoalveolar lavage (BAL) from subjects with and without IPF, as well as in plasma samples from two longitudinal IPF cohorts and demographically matched control subjects. MEASUREMENTS AND MAIN RESULTS Exposure to mtDNA augments α-smooth muscle actin expression in NHLFs. The metabolic changes in NHLFs that are induced by interactions with TGF-β1 or stiff hydrogels are accompanied by the accumulation of extracellular mtDNA. These findings replicate the spontaneous phenotype of IPF fibroblasts. mtDNA concentrations are increased in IPF BAL and plasma, and in the latter compartment, they display robust associations with disease progression and reduced event-free survival. CONCLUSIONS These findings demonstrate a previously unrecognized and highly novel connection between metabolic reprogramming, mtDNA, fibroblast activation, and clinical outcomes that provides new insight into IPF.
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Affiliation(s)
- Changwan Ryu
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | - Huanxing Sun
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | - Mridu Gulati
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | | | - Yonglin Chen
- 2 Yale University School of Bioengineering, New Haven, Connecticut
| | - Awo Osafo-Addo
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | | | - Julia Winkler
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | | | - Jaden Faunce
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | - Hongyi Pan
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | - Tony Woolard
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | | | | | | | - Martin Slade
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | | | | | - Varvara Kirillov
- 4 Department of Pathology, Stony Brook University School of Medicine, Stony Brook, New York
| | - Carol Feghali-Bostwick
- 5 Department of Medicine, Medical University of South Carolina, Charleston, South Carolina; and
| | - Kevin Gibson
- 6 Dorothy P. and Richard P. Simmons Center for Interstitial Lung Disease, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Kathleen Lindell
- 6 Dorothy P. and Richard P. Simmons Center for Interstitial Lung Disease, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | | | | | - Wajahat Mehal
- 8 Section of Digestive Diseases, Yale University School of Medicine, New Haven, Connecticut
| | | | - Erica L Herzog
- 1 Section of Pulmonary, Critical Care, and Sleep Medicine
| | - Glenda Trujillo
- 4 Department of Pathology, Stony Brook University School of Medicine, Stony Brook, New York
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