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Massier L, Musat N, Stumvoll M, Tremaroli V, Chakaroun R, Kovacs P. Tissue-resident bacteria in metabolic diseases: emerging evidence and challenges. Nat Metab 2024; 6:1209-1224. [PMID: 38898236 DOI: 10.1038/s42255-024-01065-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 05/13/2024] [Indexed: 06/21/2024]
Abstract
Although the impact of the gut microbiome on health and disease is well established, there is controversy regarding the presence of microorganisms such as bacteria and their products in organs and tissues. However, recent contamination-aware findings of tissue-resident microbial signatures provide accumulating evidence in support of bacterial translocation in cardiometabolic disease. The latter provides a distinct paradigm for the link between microbial colonizers of mucosal surfaces and host metabolism. In this Perspective, we re-evaluate the concept of tissue-resident bacteria including their role in metabolic low-grade tissue and systemic inflammation. We examine the limitations and challenges associated with studying low bacterial biomass samples and propose experimental and analytical strategies to overcome these issues. Our Perspective aims to encourage further investigation of the mechanisms linking tissue-resident bacteria to host metabolism and their potentially actionable health implications for prevention and treatment.
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Affiliation(s)
- Lucas Massier
- Department of Medicine (H7), Karolinska Institutet, Stockholm, Sweden
| | - Niculina Musat
- Aarhus University, Department of Biology, Section for Microbiology, Århus, Denmark
| | - Michael Stumvoll
- Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, Leipzig, Germany
| | - Valentina Tremaroli
- Wallenberg Laboratory, Department of Molecular and Clinical Medicine, Institute of Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Rima Chakaroun
- Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, Leipzig, Germany.
- Wallenberg Laboratory, Department of Molecular and Clinical Medicine, Institute of Medicine, University of Gothenburg, Gothenburg, Sweden.
| | - Peter Kovacs
- Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, Leipzig, Germany.
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2
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Tsai HC, Tong ZJ, Hwang TL, Wei KC, Chen PY, Huang CY, Chen KT, Lin YJ, Cheng HW, Wang HT. Acrolein produced by glioma cells under hypoxia inhibits neutrophil AKT activity and suppresses anti-tumoral activities. Free Radic Biol Med 2023; 207:17-28. [PMID: 37414347 DOI: 10.1016/j.freeradbiomed.2023.06.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 05/23/2023] [Accepted: 06/26/2023] [Indexed: 07/08/2023]
Abstract
Acrolein, which is the most reactive aldehyde, is a byproduct of lipid peroxidation in a hypoxic environment. Acrolein has been shown to form acrolein-cysteine bonds, resulting in functional changes in proteins and immune effector cell suppression. Neutrophils are the most abundant immune effector cells in circulation in humans. In the tumor microenvironment, proinflammatory tumor-associated neutrophils (TANs), which are termed N1 neutrophils, exert antitumor effects via the secretion of cytokines, while anti-inflammatory neutrophils (N2 neutrophils) support tumor growth. Glioma is characterized by significant tissue hypoxia, immune cell infiltration, and a highly immunosuppressive microenvironment. In glioma, neutrophils exert antitumor effects early in tumor development but gradually shift to a tumor-supporting role as the tumor develops. However, the mechanism of this anti-to protumoral switch in TANs remains unclear. In this study, we found that the production of acrolein in glioma cells under hypoxic conditions inhibited neutrophil activation and induced an anti-inflammatory phenotype by directly reacting with Cys310 of AKT and inhibiting AKT activity. A higher percentage of cells expressing acrolein adducts in tumor tissue are associated with poorer prognosis in glioblastoma patients. Furthermore, high-grade glioma patients have increased serum acrolein levels and impaired neutrophil functions. These results suggest that acrolein suppresses neutrophil function and contributes to the switch in the neutrophil phenotype in glioma.
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Affiliation(s)
- Hong-Chieh Tsai
- Department of Neurosurgery, Linkou Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan; School of Traditional Chinese Medicine, Chang Gung University, Taoyuan, 333, Taiwan
| | - Zhen-Jie Tong
- Institute of Pharmacology, College of Medicine, National Yang Ming Chiao Tung University, Taipei, 112, Taiwan
| | - Tsong-Long Hwang
- Graduate Institute of Natural Products, College of Medicine, Chang Gung University, Taoyuan, 333, Taiwan; Healthy Aging Research Center, Chang Gung University, Taoyuan, 333, Taiwan; Department of Anaesthesiology, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan; Research Center for Chinese Herbal Medicine, Graduate Institute of Health Industry Technology, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan, 333, Taiwan
| | - Kuo-Chen Wei
- Department of Neurosurgery, Linkou Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan; School of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan; Neuroscience Research Center, Chang Gung Memorial Hospital, Linkou, Taoyuan, 33305, Taiwan; Department of Neurosurgery, New Taipei Municipal TuCheng Hospital, Chang Gung Memorial Hospital, New Taipei Municipal, 236, Taiwan
| | - Pin-Yuan Chen
- School of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan; Department of Neurosurgery, Keelung Chang Gung Memorial Hospital, Keelung, 204, Taiwan
| | - Chiung-Yin Huang
- Department of Neurosurgery, Linkou Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan; School of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan
| | - Ko-Ting Chen
- Department of Neurosurgery, Linkou Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan; School of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan
| | - Ya-Jui Lin
- Department of Neurosurgery, Linkou Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan; School of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan
| | - Hsiao-Wei Cheng
- Institute of Pharmacology, College of Medicine, National Yang Ming Chiao Tung University, Taipei, 112, Taiwan
| | - Hsiang-Tsui Wang
- Institute of Pharmacology, College of Medicine, National Yang Ming Chiao Tung University, Taipei, 112, Taiwan; Institute of Food Safety and Health Risk Assessment, National Yang Ming Chiao Tung University, Taipei, 112, Taiwan; Doctor Degree Program in Toxicology, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
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3
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Wilkins GC, Gilmour J, Giannoudaki E, Kirby JA, Sheerin NS, Ali S. Dissecting the Therapeutic Mechanisms of Sphingosine-1-Phosphate Receptor Agonism during Ischaemia and Reperfusion. Int J Mol Sci 2023; 24:11192. [PMID: 37446370 PMCID: PMC10342646 DOI: 10.3390/ijms241311192] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/21/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023] Open
Abstract
Sphingosine 1-phosphate (S1P) and S1P receptors (S1PR) regulate many cellular processes, including lymphocyte migration and endothelial barrier function. As neutrophils are major mediators of inflammation, their transendothelial migration may be the target of therapeutic approaches to inflammatory conditions such as ischaemia-reperfusion injury (IRI). The aim of this project was to assess whether these therapeutic effects are mediated by S1P acting on neutrophils directly or indirectly through the endothelial cells. First, our murine model of peritoneum cell recruitment demonstrated the ability of S1P to reduce CXCL8-mediated neutrophil recruitment. Mechanistic in vitro studies revealed that S1P signals in neutrophils mainly through the S1PR1 and 4 receptors and induces phosphorylation of ERK1/2; however, this had no effect on neutrophil transmigration and adhesion. S1P treatment of endothelial cells significantly reduced TNF-α-induced neutrophil adhesion under flow (p < 0.01) and transendothelial migration towards CXCL8 during in vitro chemotaxis assays (p < 0.05). S1PR1 agonist CYM5442 treatment of endothelial cells also reduced neutrophil transmigration (p < 0.01) and endothelial permeability (p < 0.005), as shown using in vitro permeability assays. S1PR3 agonist had no effects on chemotaxis or permeability. In an in vivo mouse model of renal IRI, S1PR agonism with CYM5442 reduced endothelial permeability as shown by reduced Evan's Blue dye extravasation. Western blot was used to assess phosphorylation at different sites on vascular endothelial (VE)-cadherin and showed that CYM5442 reduced VEGF-mediated phosphorylation. Taken together, the results of this study suggest that reductions in neutrophil infiltration during IRI in response to S1P are mediated primarily by S1PR1 signalling on endothelial cells, possibly by altering phosphorylation of VE-cadherin. The results also demonstrate the therapeutic potential of S1PR1 agonist during IRI.
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Affiliation(s)
| | | | | | | | - Neil S. Sheerin
- Immunity and Inflammation, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK; (G.C.W.); (J.G.); (E.G.); (J.A.K.)
| | - Simi Ali
- Immunity and Inflammation, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK; (G.C.W.); (J.G.); (E.G.); (J.A.K.)
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4
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Chen B, Song Y, Yang X, Yang J, Hao F. Bacterial DNA promoting inflammation via the Sgk1/Nedd4L/Syk pathway in mast cells contributes to antihistamine-nonresponsive CSU. J Leukoc Biol 2023; 113:461-470. [PMID: 36857592 DOI: 10.1093/jleuko/qiad025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 12/31/2022] [Accepted: 01/31/2023] [Indexed: 03/03/2023] Open
Abstract
Inflammation centered on non-IgE-mediated mast cell activation characterizes chronic spontaneous urticaria resistant to nonsedating H1-antihistamines. We recently uncovered a strong positive association between inflammation and the fecal Escherichia. To further explore the actions of bacterial DNA derived from Escherichia on mast cells, intestinal permeability of patients with chronic spontaneous urticaria with or without nonsedating H1-antihistamine resistance and healthy controls were determined, and LAD2 cells with knockdown of Syk, Nedd4L, or Sgk1 or with incubation of inhibitors GS9973, GSK650394, and MG132 were posttreated with btDNA. We found that (i) serum intestinal permeability indices and bacterial DNA markedly increased in patients with chronic spontaneous urticaria with nonsedating H1-antihistamine resistance compared with those without (all P < 0.001), and bacterial DNA positively correlated with the degree of inflammation; (ii) IL-6 and TNF-α levels were time- and dose-dependently upregulated in bacterial DNA-stimulated LAD2 cells, which relied on unmethylated CpG in bacterial DNA and Toll-like receptor 9 protein in cells; (iii) Syk knockdown or inhibition of Syk Tyr525/526 phosphorylation blocked bacterial DNA-initiated cytokine production; (iv) Nedd4L interacted with Tyr525/526-phosphorylated Syk, and inhibition of Nedd4L Ser448 phosphorylation induced by bacterial DNA-activated Sgk1 was mandatory for bacterial DNA's proinflammatory property; and (v) Sgk1 suppression showed an inhibitory effect on bacterial DNA-induced inflammation by ensuring Nedd4L-mediated ubiquitination of Tyr525/526-phosphorylated Syk. Collectively, we identified previously unknown contributory roles of bacterial translocation and serum bacterial DNA on the inflammation phenotype in patients with chronic spontaneous urticaria with nonsedating H1-antihistamine resistance and further uncovered a vital negative regulatory role for the Sgk1/Nedd4L/Syk pathway in bacterial DNA-induced inflammation in LAD2 cells.
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Affiliation(s)
- Bangtao Chen
- Department of Dermatology, Chongqing University Three Gorges Hospital, School of Medicine, Chongqing University, No.165, Xincheng Road, Wanzhou District, Chongqing 400030, China
| | - Yao Song
- Department of Pediatrics, The Third Affiliated Hospital of Chongqing Medical University, No.1, Shuanghu Road, Yubei District, Chongqing 401120, China
- Department of Dermatology, The Third Affiliated Hospital of Chongqing Medical University, No.1, Shuanghu Road, Yubei District, Chongqing 401120, China
| | - Xiongbo Yang
- Department of Dermatology, Chongqing University Three Gorges Hospital, School of Medicine, Chongqing University, No.165, Xincheng Road, Wanzhou District, Chongqing 400030, China
| | - Jing Yang
- Department of Dermatology, Chongqing University Three Gorges Hospital, School of Medicine, Chongqing University, No.165, Xincheng Road, Wanzhou District, Chongqing 400030, China
| | - Fei Hao
- Department of Pediatrics, The Third Affiliated Hospital of Chongqing Medical University, No.1, Shuanghu Road, Yubei District, Chongqing 401120, China
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5
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Siddiqui SS, Dhar C, Sundaramurthy V, Sasmal A, Yu H, Bandala-Sanchez E, Li M, Zhang X, Chen X, Harrison LC, Xu D, Varki A. Sialoglycan recognition is a common connection linking acidosis, zinc, and HMGB1 in sepsis. Proc Natl Acad Sci U S A 2021; 118:e2018090118. [PMID: 33658363 PMCID: PMC7958265 DOI: 10.1073/pnas.2018090118] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Blood pH is tightly maintained between 7.35 and 7.45, and acidosis (pH <7.3) indicates poor prognosis in sepsis, wherein lactic acid from anoxic tissues overwhelms the buffering capacity of blood. Poor sepsis prognosis is also associated with low zinc levels and the release of High mobility group box 1 (HMGB1) from activated and/or necrotic cells. HMGB1 added to whole blood at physiological pH did not bind leukocyte receptors, but lowering pH with lactic acid to mimic sepsis conditions allowed binding, implying the presence of natural inhibitor(s) preventing binding at normal pH. Testing micromolar concentrations of divalent cations showed that zinc supported the robust binding of sialylated glycoproteins with HMGB1. Further characterizing HMGB1 as a sialic acid-binding lectin, we found that optimal binding takes place at normal blood pH and is markedly reduced when pH is adjusted with lactic acid to levels found in sepsis. Glycan array studies confirmed the binding of HMGB1 to sialylated glycan sequences typically found on plasma glycoproteins, with binding again being dependent on zinc and normal blood pH. Thus, HMGB1-mediated hyperactivation of innate immunity in sepsis requires acidosis, and micromolar zinc concentrations are protective. We suggest that the potent inflammatory effects of HMGB1 are kept in check via sequestration by plasma sialoglycoproteins at physiological pH and triggered when pH and zinc levels fall in late stages of sepsis. Current clinical trials independently studying zinc supplementation, HMGB1 inhibition, or pH normalization may be more successful if these approaches are combined and perhaps supplemented by infusions of heavily sialylated molecules.
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Affiliation(s)
- Shoib S Siddiqui
- Department of Medicine, University of California San Diego, La Jolla, CA 92093
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093
- Glycobiology Research and Training Center, University of California San Diego, La Jolla, CA 92093
| | - Chirag Dhar
- Department of Medicine, University of California San Diego, La Jolla, CA 92093
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093
- Glycobiology Research and Training Center, University of California San Diego, La Jolla, CA 92093
| | - Venkatasubramaniam Sundaramurthy
- Department of Medicine, University of California San Diego, La Jolla, CA 92093
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093
- Glycobiology Research and Training Center, University of California San Diego, La Jolla, CA 92093
| | - Aniruddha Sasmal
- Department of Medicine, University of California San Diego, La Jolla, CA 92093
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093
- Glycobiology Research and Training Center, University of California San Diego, La Jolla, CA 92093
| | - Hai Yu
- Department of Chemistry, University of California, Davis, CA 95616
| | - Esther Bandala-Sanchez
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Miaomiao Li
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, The State University of New York, Buffalo, NY 14214
| | - Xiaoxiao Zhang
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, The State University of New York, Buffalo, NY 14214
| | - Xi Chen
- Department of Chemistry, University of California, Davis, CA 95616
| | - Leonard C Harrison
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Ding Xu
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, The State University of New York, Buffalo, NY 14214
| | - Ajit Varki
- Department of Medicine, University of California San Diego, La Jolla, CA 92093;
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093
- Glycobiology Research and Training Center, University of California San Diego, La Jolla, CA 92093
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6
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Moser C, Jensen PØ, Thomsen K, Kolpen M, Rybtke M, Lauland AS, Trøstrup H, Tolker-Nielsen T. Immune Responses to Pseudomonas aeruginosa Biofilm Infections. Front Immunol 2021; 12:625597. [PMID: 33692800 PMCID: PMC7937708 DOI: 10.3389/fimmu.2021.625597] [Citation(s) in RCA: 74] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 01/20/2021] [Indexed: 12/17/2022] Open
Abstract
Pseudomonas aeruginosa is a key pathogen of chronic infections in the lungs of cystic fibrosis patients and in patients suffering from chronic wounds of diverse etiology. In these infections the bacteria congregate in biofilms and cannot be eradicated by standard antibiotic treatment or host immune responses. The persistent biofilms induce a hyper inflammatory state that results in collateral damage of the adjacent host tissue. The host fails to eradicate the biofilm infection, resulting in hindered remodeling and healing. In the present review we describe our current understanding of innate and adaptive immune responses elicited by P. aeruginosa biofilms in cystic fibrosis lung infections and chronic wounds. This includes the mechanisms that are involved in the activation of the immune responses, as well as the effector functions, the antimicrobial components and the associated tissue destruction. The mechanisms by which the biofilms evade immune responses, and potential treatment targets of the immune response are also discussed.
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Affiliation(s)
- Claus Moser
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Peter Østrup Jensen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.,Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Kim Thomsen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Mette Kolpen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Morten Rybtke
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anne Sofie Lauland
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Hannah Trøstrup
- Department of Plastic Surgery and Breast Surgery, Zealand University Hospital, Roskilde, Denmark
| | - Tim Tolker-Nielsen
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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7
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Lu YJ, Wang YH, Sahu RS, Chen JP, Dash BS, Chung PJ, Yang HW, Chuang EY, Hwang TL. Mechanism of Nanoformulated Graphene Oxide-Mediated Human Neutrophil Activation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:40141-40152. [PMID: 32845120 DOI: 10.1021/acsami.0c12490] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Understanding the molecular mechanisms of graphene oxide (GO)-based biomaterials is important for logical biomedical applications. Previous studies have revealed biointeractions between GO and immune effector cells, but the effects on neutrophils, crucial cells in the immune system, have not been thoroughly discussed. In this study, GO nanoformulations were synthesized with different functional groups, including GO, GO-carboxylated (GO-COOH), and PEGylated GO (GO-PEG), with different surface features, which were elucidated using imaging methods and surface-sensitive quantitative spectroscopic techniques, including atomic force microscopy (AFM), transmission electron microscopy (TEM), and X-ray photoemission spectroscopy (XPS). The GO-based nanoformulations elicited reactive oxygen species (ROS) generation and neutrophil extracellular trap (NET) formation in human neutrophils. Nanoformulated GO stimulates NET development via the formation of ROS. An endocytosis study revealed that nanoformulated GO facilitated internalization by neutrophils via macropinocytosis and actin-dependent phagocytosis. Importantly, calcium mobilization and phosphorylation proteins such as mitogen-activated protein kinases (extracellular signal-regulated kinase, c-Jun N-terminal kinase, and p38) and AKT were involved in the activation of neutrophils. These findings offer the first verification that nanoformulated GO exhibits direct effects on human neutrophils.
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Affiliation(s)
- Yu-Jen Lu
- Department of Neurosurgery, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
| | - Yi-Hsuan Wang
- Graduate Institute of Natural Products, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
| | - Rama Shanker Sahu
- Department of Agricultural Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Jyh-Ping Chen
- Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Banendu Sunder Dash
- Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Pei-Jen Chung
- Graduate Institute of Natural Products, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
| | - Hung-Wei Yang
- Institute of Medical Science and Technology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
| | - Er-Yuan Chuang
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, International Ph.D. Program of Biomedical Engineering, Taipei Medical University, Taipei 110, Taiwan
- Cell Physiology and Molecular Image Research Center, Taipei Medical University-Wan Fang Hospital, Taipei 116, Taiwan
| | - Tsong-Long Hwang
- Graduate Institute of Natural Products, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
- Research Center for Chinese Herbal Medicine, Research Center for Food and Cosmetic Safety, Graduate Institute of Health Industry Technology, Chang Gung University of Science and Technology, Taoyuan 333, Taiwan
- Department of Anesthesiology, Chang Gung Memorial Hospital, Taoyuan 33302, Taiwan
- Department of Chemical Engineering, Ming-Chi University of Technology, New Taipei City 243, Taiwan
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8
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Puyo CA, Peruzzi D, Earhart A, Roller E, Karanikolas M, Kollef MH, Krupnick AS, Kreisel D, Ibrahim M, Gelman AE. Endotracheal tube-induced sore throat pain and inflammation is coupled to the release of mitochondrial DNA. Mol Pain 2018; 13:1744806917731696. [PMID: 28929859 PMCID: PMC5598795 DOI: 10.1177/1744806917731696] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
In the absence of infection, the pathophysiology of endotracheal tube-induced sore throat pain is unclear. Activated neutrophils release elastase, reactive oxygen species, and inflammatory cytokines known to contribute to neuropathic pain. Sterile tissue injury can cause the release of damage-associated molecular patterns such as mitochondrial DNA that promote neutrophil activation. We hypothesized that endotracheal tube-induced sore throat pain is linked to mitochondrial DNA-mediated neutrophil inflammation. A nonrandomized prospective survey for sore throat pain was conducted in 31 patients who required short-term intubation and had no evidence of upper airway infection. Patterns of neutrophil abundance, activation, and mitochondrial DNA levels were analyzed in tracheal lavage fluid following intubation and prior to extubation. Thirteen of 31 patients reported sore throat pain. Sore throat patients had high neutrophilia with elevated adhesion molecule and TLR9 expression and constitutive reactive oxygen species generation. Tracheal lavage fluid from sore throat patients accumulated mitochondrial DNA and stimulated neutrophils to release mediators associated with pain in a TLR9- and DNAse-dependent fashion. Endotracheal tube-induced sore throat is linked to the release of mitochondrial DNA and can drive TLR9-mediated inflammatory responses by neutrophils reported to cause pain. Mitigating the effects of cell-free mitochondrial DNA may prove beneficial for the prevention of endotracheal tube-mediated sore throat pain.
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Affiliation(s)
- Carlos A Puyo
- 1 Department of Anesthesiology and Critical Care, 12275 Washington University School of Medicine in St. Louis , MO, USA
| | - Daniela Peruzzi
- 2 Department of Surgery, 12275 Washington University School of Medicine in St. Louis , MO, USA.,3 Department of Medical-Surgical Science and Translational Medicine, Sapienza University, Rome, Italy
| | - Alexander Earhart
- 1 Department of Anesthesiology and Critical Care, 12275 Washington University School of Medicine in St. Louis , MO, USA
| | - Evan Roller
- 1 Department of Anesthesiology and Critical Care, 12275 Washington University School of Medicine in St. Louis , MO, USA
| | - Menelaos Karanikolas
- 1 Department of Anesthesiology and Critical Care, 12275 Washington University School of Medicine in St. Louis , MO, USA
| | - Marin H Kollef
- 5 Department of Internal Medicine, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Alexander S Krupnick
- 2 Department of Surgery, 12275 Washington University School of Medicine in St. Louis , MO, USA.,4 Department of Surgery, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Daniel Kreisel
- 2 Department of Surgery, 12275 Washington University School of Medicine in St. Louis , MO, USA
| | - Mohsen Ibrahim
- 2 Department of Surgery, 12275 Washington University School of Medicine in St. Louis , MO, USA.,3 Department of Medical-Surgical Science and Translational Medicine, Sapienza University, Rome, Italy
| | - Andrew E Gelman
- 2 Department of Surgery, 12275 Washington University School of Medicine in St. Louis , MO, USA.,3 Department of Medical-Surgical Science and Translational Medicine, Sapienza University, Rome, Italy
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9
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Zhao Q, Hu Y, Deng S, Yu P, Chen B, Wang Z, Han X. Cytidine-phosphate-guanosine oligodeoxynucleotides in combination with CD40 ligand decrease periodontal inflammation and alveolar bone loss in a TLR9-independent manner. J Appl Oral Sci 2018; 26:e20170451. [PMID: 29791566 PMCID: PMC5953564 DOI: 10.1590/1678-7757-2017-0451] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Accepted: 01/05/2018] [Indexed: 01/22/2023] Open
Abstract
Local administration of toll-like receptor 9 (TLR9), agonist cytidine-phosphate-guanosine oligodeoxynucleotide (CpG ODNs), and CD40 ligand (CD40L) can decrease ligature-induced periodontal inflammation and bone loss in wild type (WT) mouse.
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Affiliation(s)
- Qian Zhao
- Department of Stomatology, Beijing ChaoYang Hospital, Capital Medical University, Beijing, China
| | - Yang Hu
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
| | - Shu Deng
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
| | - Pei Yu
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
| | - Bowen Chen
- Winchester High School, Winchester, MA, USA
| | - Zuomin Wang
- Department of Stomatology, Beijing ChaoYang Hospital, Capital Medical University, Beijing, China
| | - Xiaozhe Han
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
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10
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Forestier C, Billard E, Milon G, Gueirard P. Unveiling and Characterizing Early Bilateral Interactions between Biofilm and the Mouse Innate Immune System. Front Microbiol 2017; 8:2309. [PMID: 29209305 PMCID: PMC5702342 DOI: 10.3389/fmicb.2017.02309] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 11/08/2017] [Indexed: 12/20/2022] Open
Abstract
A very substantial progress has been made in our understanding of infectious diseases caused by invasive bacteria. Under their planktonic forms, bacteria transiently reside in the otherwise sterile mammal body tissues, as the physiological inflammation insures both their clearance and repair of any tissue damage. Yet, the bacteria prone to experience planktonic to biofilm developmental transition still need to be studied. Of note, sessile bacteria not only persist but also concur preventing the effectors and regulators of the physiological inflammation to operate. Thus, it is urgent to design biologically sound experimental approaches aimed to extract, at the earliest stage, immune signatures of mono-bacteria planktonic to biofilm developmental transition in vivo and ex vivo. Indeed, the transition is often the first event to which succeeds the “chronicization” process whereby classical bacteria-targeting therapies are no more efficacious. An in vivo model of micro-injection of Staphylococcus aureus planktonic or biofilm cells in the ear pinna dermis of laboratory transgenic mice with fluorescent immune cells is proposed. It allows visualizing, in real time, the range of the early interactions between the S. aureus and myeloid cell subsets- the resident macrophages and dendritic cells, the recruited neutrophil granulocytes/polymorphonuclear neutrophils, monocytes otherwise known to differentiate as macrophages or dendritic cells. One main objective is to extract contrasting immune signatures of the modulation of the physiological inflammation with respect to the two bacterial lifestyles.
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Affiliation(s)
- Christiane Forestier
- CNRS UMR 6023, Laboratoire Microorganismes: Génome et Environnement, Université Clermont-Auvergne, Clermont-Ferrand, France
| | - Elisabeth Billard
- INRA USC 2018, Inserm U1071, Laboratoire Microbes Intestin Inflammation et Susceptibilité de l'Hôte, Université Clermont-Auvergne, Clermont-Ferrand, France
| | | | - Pascale Gueirard
- CNRS UMR 6023, Laboratoire Microorganismes: Génome et Environnement, Université Clermont-Auvergne, Clermont-Ferrand, France
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11
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Moser C, Pedersen HT, Lerche CJ, Kolpen M, Line L, Thomsen K, Høiby N, Jensen PØ. Biofilms and host response - helpful or harmful. APMIS 2017; 125:320-338. [PMID: 28407429 DOI: 10.1111/apm.12674] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 01/14/2017] [Indexed: 01/09/2023]
Abstract
Biofilm infections are one of the modern medical world's greatest challenges. Probably, all non-obligate intracellular bacteria and fungi can establish biofilms. In addition, there are numerous biofilm-related infections, both foreign body-related and non-foreign body-related. Although biofilm infections can present in numerous ways, one common feature is involvement of the host response with significant impact on the course. A special characteristic is the synergy of the innate and the acquired immune responses for the induced pathology. Here, we review the impact of the host response for the course of biofilm infections, with special focus on cystic fibrosis, chronic wounds and infective endocarditis.
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Affiliation(s)
- Claus Moser
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Hannah Trøstrup Pedersen
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Christian Johann Lerche
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Mette Kolpen
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.,Costerton Biofilm Center, Institute of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
| | - Laura Line
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Kim Thomsen
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Niels Høiby
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.,Costerton Biofilm Center, Institute of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
| | - Peter Østrup Jensen
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.,Costerton Biofilm Center, Institute of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
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12
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Giai C, Gonzalez CD, Sabbione F, Garofalo A, Ojeda D, Sordelli DO, Trevani AS, Gómez MI. Staphylococcus aureus Induces Shedding of IL-1RII in Monocytes and Neutrophils. J Innate Immun 2016; 8:284-98. [PMID: 26967533 DOI: 10.1159/000443663] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Accepted: 12/28/2015] [Indexed: 12/17/2022] Open
Abstract
Interleukin 1 (IL-1) β is a critical cytokine that orchestrates host defenses against Staphylococcus aureus and is crucial for the eradication of bacteria. The production and action of IL-1β are regulated by multiple control pathways. Among them, IL-1RII (the type II IL-1 receptor) acts as a decoy receptor and has been shown to regulate the biological effects of IL-1β. High levels of soluble IL-1RII are present in septic patients; however, the stimuli that regulate the expression and release of IL-1RII in pathological conditions are incompletely elucidated. In the present study, we demonstrated the ability of S. aureus and protein A to induce IL-1RII shedding in myeloid cells. The positive modulation of IL-1RII expression and cleavage was associated with the failure to detect IL-1β in response to S. aureus both in vitro and in vivo, suggesting that the soluble form of the receptor could be masking the availability of IL-1β. The absence of detectable IL-1β was associated with low levels of inflammatory cytokines and chemokines known to be regulated by IL-1β and with increased bacterial persistence. Modulation of decoy receptors during systemic S. aureus infection is proposed as a new strategy used by this bacterium to evade the immune response.
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Affiliation(s)
- Constanza Giai
- Instituto de Investigaciones en Microbiologia y Parasitologia Medica (IMPaM), Consejo Nacional de Investigaciones Cientx00ED;ficas y Tx00E9;cnicas, Universidad de Buenos Aires, Buenos Aires, Argentina
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13
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Prikhodko AS, Shabanov AK, Zinovkina LA, Popova EN, Aznauryan MA, Lanina NO, Vitushkina MV, Zinovkin RA. Pure Mitochondrial DNA Does Not Activate Human Neutrophils in vitro. BIOCHEMISTRY (MOSCOW) 2016; 80:629-35. [PMID: 26071783 DOI: 10.1134/s0006297915050168] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Excessive activation of the innate immune system often leads to fatal consequences and can be considered as one of the phenoptotic events. After traumatic injury, various components of mitochondria are released into the circulation and stimulate myeloid cells of the innate immunity. Presumably, mitochondrial DNA (mtDNA) might activate immune cells (Zhang, Q., et al. (2010) Nature, 464, 104-107). In the present study, we investigated the role of mtDNA as a direct activator of human neutrophils, as well as a prognostic marker in patients with severe trauma. Quantitative determination of mtDNA in the plasma of these patients revealed its significant increase (p < 0.02) in the group of survivors compared to non-survivors. Highly purified mtDNA was not able to induce activation of human neutrophils, thus possibly indicating the existence of additional factor(s) ensuring the recognition of mtDNA as a damage-associated molecular pattern.
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Affiliation(s)
- A S Prikhodko
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, 119991, Russia
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14
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Kanno E, Kawakami K, Miyairi S, Tanno H, Suzuki A, Kamimatsuno R, Takagi N, Miyasaka T, Ishii K, Gotoh N, Maruyama R, Tachi M. Promotion of acute-phase skin wound healing by Pseudomonas aeruginosa C 4 -HSL. Int Wound J 2015; 13:1325-1335. [PMID: 26471357 DOI: 10.1111/iwj.12523] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 08/31/2015] [Accepted: 09/20/2015] [Indexed: 11/27/2022] Open
Abstract
A Pseudomonas aeruginosa quorum-sensing system, which produces N-(3-oxododecanoyl)-l-homoserine lactone (3-oxo-C12 -HSL) and N-butanoyl-l-homoserine lactone (C4 -HSL), regulates the virulence factors. In our previous study, 3-oxo-C12 -HSL, encoded by lasI gene, was shown to promote wound healing. However, the effect of C4 -HSL, encoded by rhlI gene, remains to be elucidated. We addressed the effect of C4 -HSL on wounds in P. aeruginosa infection. Wounds were created on the backs of Sprague-Dawley SD rats, and P. aeruginosa PAO1 (PAO1) or its rhlI deletion mutant (ΔrhlI) or lasI deletion mutant (ΔlasI) was inoculated onto the wound. Rats were injected intraperitoneally with anti-C4 -HSL antiserum or treated with C4 -HSL at the wound surface. PAO1 inoculation led to significant acceleration of wound healing, which was associated with neutrophil infiltration and TNF-α synthesis. These responses were reversed, except for TNF-α production, when ΔrhlI was inoculated instead of PAO1 or when rats were co-treated with PAO1 and anti-C4 -HSL antiserum. In contrast, the healing process and neutrophil infiltration, but not TNF-α synthesis, were accelerated when C4 -HSL was administered in the absence of PAO1. This acceleration was not affected by anti-TNF-α antibody. These results suggest that C4 -HSL may be involved in the acceleration of acute wound healing in P. aeruginosa infection by modifying the neutrophilic inflammation.
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Affiliation(s)
- Emi Kanno
- Department of Science of Nursing Practice, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kazuyoshi Kawakami
- Department of Medical Microbiology, Mycology and Immunology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Shinichi Miyairi
- Laboratory of Organic Chemistry, School of Pharmacy, Nihon University, Chiba, Japan
| | - Hiromasa Tanno
- Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Aiko Suzuki
- Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Rina Kamimatsuno
- Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Naoyuki Takagi
- Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Tomomitsu Miyasaka
- Department of Medical Microbiology, Mycology and Immunology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Keiko Ishii
- Department of Medical Microbiology, Mycology and Immunology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Naomasa Gotoh
- Department of Microbiology and Infection Control Sciences, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Ryoko Maruyama
- Department of Science of Nursing Practice, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Masahiro Tachi
- Department of Plastic and Reconstructive Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
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15
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Murphy MP, Caraher E. Residence in biofilms allows Burkholderia cepacia complex (Bcc) bacteria to evade the antimicrobial activities of neutrophil-like dHL60 cells. Pathog Dis 2015; 73:ftv069. [PMID: 26371179 DOI: 10.1093/femspd/ftv069] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/25/2015] [Indexed: 12/14/2022] Open
Abstract
Bacteria of the Burkholderia cepacia complex (Bcc) persist in the airways of people with cystic fibrosis (CF) despite the continuous recruitment of neutrophils. Most members of Bcc are multidrug resistant and can form biofilms. As such, we sought to investigate whether biofilm formation plays a role in protecting Bcc bacteria from neutrophils. Using the neutrophil-like, differentiated cell line, dHL60, we have shown for the first time that Bcc biofilms are enhanced in the presence of these cells. Biofilm biomass was greater following culture in the presence of dHL60 cells than in their absence, likely the result of incorporating dHL60 cellular debris into the biofilm. Moreover, we have demonstrated that mature biofilms (cultured for up to 72 h) induced necrosis in the cells. Established biofilms also acted as a barrier to the migration of the cells and masked the bacteria from being recognized by the cells; dHL60 cells expressed less IL-8 mRNA and secreted significantly less IL-8 when cultured in the presence of biofilms, with respect to planktonic bacteria. Our findings provide evidence that biofilm formation can, at least partly, enable the persistence of Bcc bacteria in the CF airway and emphasize a requirement for anti-biofilm therapeutics.
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Affiliation(s)
- Mark P Murphy
- Centre for Microbial-Host Interactions, Institute of Technology Tallaght, Dublin 24, Ireland Centre of Applied Science for Health, Institute of Technology Tallaght, Dublin 24, Ireland
| | - Emma Caraher
- Centre for Microbial-Host Interactions, Institute of Technology Tallaght, Dublin 24, Ireland Centre of Applied Science for Health, Institute of Technology Tallaght, Dublin 24, Ireland
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16
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Alvarez-Arellano L, Cortés-Reynosa P, Sánchez-Zauco N, Salazar E, Torres J, Maldonado-Bernal C. TLR9 and NF-κB are partially involved in activation of human neutrophils by Helicobacter pylori and its purified DNA. PLoS One 2014; 9:e101342. [PMID: 24987851 PMCID: PMC4079333 DOI: 10.1371/journal.pone.0101342] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 06/05/2014] [Indexed: 01/27/2023] Open
Abstract
Helicobacter pylori infection represents one of the most common bacterial infections worldwide. The inflammatory response to this bacterium involves a large influx of neutrophils to the lamina propria of the gastric mucosa. However, little is known about the receptors and molecular mechanisms involved in activation of these neutrophils. In this study, we aimed to determine the role of toll-like receptor 9 (TLR9) in the response of human neutrophils to H. pylori and purified H. pylori DNA (Hp-DNA). Neutrophils were isolated from the blood of adult volunteers and challenged with either H. pylori or Hp-DNA. We found that both, H. pylori and Hp-DNA induced increased expression and release of IL-8. Furthermore, we showed that TLR9 is involved in the induction of IL-8 production by H. pylori and Hp-DNA. IL-8 production induced by H. pylori but not by Hp-DNA was partially mediated by NF-κB. In conclusion, this study showed for first time that both, H. pylori and Hp-DNA activate TLR9 and induce a different inflammatory response that leads to activation of neutrophils.
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Affiliation(s)
- Lourdes Alvarez-Arellano
- Unidad de Investigación en Enfermedades Infecciosas, Hospital de Pediatría del Instituto Mexicano del Seguro Social, Mexico City, México
- Laboratorio de Neuroinmunobiología del Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología de la Universidad Nacional Autónoma de México, Cuernavaca, Morelos, México
| | - Pedro Cortés-Reynosa
- Departamento de Biología Celular del Centro de Investigación y Estudios Avanzados, Instituto Politécnico Nacional, Mexico City, México
| | - Norma Sánchez-Zauco
- Unidad de Investigación en Enfermedades Infecciosas, Hospital de Pediatría del Instituto Mexicano del Seguro Social, Mexico City, México
- Laboratorio de Investigación en Inmunología y Proteómica, Hospital Infantil de México Federico Gómez, Mexico City, México
| | - Eduardo Salazar
- Departamento de Biología Celular del Centro de Investigación y Estudios Avanzados, Instituto Politécnico Nacional, Mexico City, México
| | - Javier Torres
- Unidad de Investigación en Enfermedades Infecciosas, Hospital de Pediatría del Instituto Mexicano del Seguro Social, Mexico City, México
| | - Carmen Maldonado-Bernal
- Unidad de Investigación en Enfermedades Infecciosas, Hospital de Pediatría del Instituto Mexicano del Seguro Social, Mexico City, México
- Laboratorio de Investigación en Inmunología y Proteómica, Hospital Infantil de México Federico Gómez, Mexico City, México
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17
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Haddad LE, Sirois MG. Angiopoietin-1 upregulates de novo expression of IL-1β and Il1-Ra, and the exclusive release of Il1-Ra from human neutrophils. PLoS One 2014; 9:e88980. [PMID: 24563688 PMCID: PMC3923077 DOI: 10.1371/journal.pone.0088980] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 01/14/2014] [Indexed: 01/24/2023] Open
Abstract
The expression of the angiopoietin (Ang) receptor, Tie2, on both endothelial and inflammatory cells supports the idea that Ang signaling may play a fundamental role in initiating and maintaining the inflammatory response. We have previously shown that Ang1 and/or Ang2 alter the innate immune response by enhancing human neutrophil survival, chemotaxis and production of inflammatory cytokine interleukin-8 (IL-8) in vitro. Thus, we hypothesized that Ang1 and Ang2 could modulate other inflammatory signals in neutrophils, a possibility we explored through a gene-based assay looking at changes in the mRNA expression of 84 inflammatory cytokines and their receptors. We observed that Ang1 (10(-8) M), but not Ang2, increased mRNA expression of prominent pro-inflammatory cytokine IL-1β and its natural antagonist IL-1RA, by up to 32.6- and 10.0-fold respectively, compared to PBS-control. The effects of Ang1 extended to the proteins, as Ang1 increased intracellular levels of precursor and mature IL-1β, and extracellular levels of IL-1RA proteins, by up to 4.2-, 5.0- and 4.4-fold respectively, compared to PBS-control. Interestingly, Ang1 failed at inducing IL-1β protein release or at increasing intracellular IL-1RA, but the ratio of IL-1RA to mature IL-1β remained above 100-fold molar excess inside and outside the cells. The above-noted effects of Ang1 were mediated by MAP kinases, whereby inhibiting MEK1/2 lead to up to 70% effect reduction, whereas the blockade of p38MAPK activity doubled Ang1's effect. These findings suggest that Ang1 selectively alters the balance of neutrophil-derived inflammatory cytokines, favoring the blockade of IL-1 activity, a consideration for future therapies of inflammatory diseases.
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Affiliation(s)
- Lydia E. Haddad
- Research Center, Montreal Heart Institute, Montréal, Canada
- Department Of Pharmacology, Faculty of Medicine, Université De Montréal, Montréal, Canada
| | - Martin G. Sirois
- Research Center, Montreal Heart Institute, Montréal, Canada
- Department Of Pharmacology, Faculty of Medicine, Université De Montréal, Montréal, Canada
- * E-mail:
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18
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Liu G, Bi Y, Wang R, Shen B, Zhang Y, Yang H, Wang X, Liu H, Lu Y, Han F. Kinase AKT1 negatively controls neutrophil recruitment and function in mice. THE JOURNAL OF IMMUNOLOGY 2013; 191:2680-90. [PMID: 23904165 DOI: 10.4049/jimmunol.1300736] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Neutrophils are critically involved in host defense and inflammatory injury. However, intrinsic signaling mechanisms controlling neutrophil recruitment and activities are poorly defined. In this article, we showed that protein kinase AKT1 (also known as PKBα) is the dominant isoform expressed in neutrophils and is downregulated upon bacterial infection and neutrophil activation. AKT1 deficiency resulted in severe disease progression accompanied by recruitment of neutrophils and enhanced bactericidal activity in the acute inflammatory lung injury (ALI) and the Staphylococcus aureus infection mouse models. Moreover, the depletion of neutrophils efficiently reversed the aggravated inflammatory response, but adoptive transfer of AKT1(-/-) neutrophils could potentiate the inflammatory immunity, indicating an intrinsic effect of the neutrophil in modulating inflammation in AKT1(-/-) mice. In the ALI model, the infiltration of neutrophils into the inflammatory site was associated with enhanced migration capacity, whereas inflammatory stimuli could promote neutrophil apoptosis. In accordance with these findings, neutralization of CXCR2 attenuated neutrophil infiltration and delayed the occurrence of inflammation. Finally, the enhanced bactericidal activity and inflammatory immunity of AKT-deficient neutrophils were mediated by a STAT1-dependent, but not a mammalian target of rapamycin-dependent, pathway. Thus, our findings indicated that the AKT1-STAT1 signaling axis negatively regulates neutrophil recruitment and activation in ALI and S. aureus infection in mice.
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Affiliation(s)
- Guangwei Liu
- Department of Immunology, Shanghai Medical College, Fudan University, Shanghai 200023, People's Republic of China.
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19
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Thomas CJ, Schroder K. Pattern recognition receptor function in neutrophils. Trends Immunol 2013; 34:317-28. [DOI: 10.1016/j.it.2013.02.008] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 02/26/2013] [Accepted: 02/28/2013] [Indexed: 12/13/2022]
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Tamassia N, Cassatella MA. Cytoplasmic receptors recognizing nucleic acids and mediating immune functions in neutrophils. Curr Opin Pharmacol 2013; 13:547-54. [PMID: 23725881 DOI: 10.1016/j.coph.2013.05.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 04/26/2013] [Accepted: 05/03/2013] [Indexed: 01/02/2023]
Abstract
Cells belonging to the innate immune system, including neutrophils, rapidly respond to invading microorganisms by recognizing a wide range of microbial-derived products referred to as pathogen-associated molecular patterns (PAMPs). Generally speaking, PAMPs include molecular structures associated with microbial envelopes (such as bacterial lipopolysaccharide, lipoproteins, and flagellin) and microbial nucleic acids. PAMPs bind to and activate various families of germline-encoded receptors carried by cells of the innate immune system, known as pattern-recognition receptors (PRRs). This group of receptors, located in various subcellular compartments, in turn generates a series of intracellular signaling pathways that coordinately modulate the transcription of hundreds of inflammatory genes, the products of which directly control infection and/or contribute to promote the development of the innate and adaptive immune responses. Herein, we summarize current knowledge on neutrophil recognition and response to foreign cytoplasmic nucleic acids.
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Affiliation(s)
- Nicola Tamassia
- Department of Pathology and Diagnostics, Section of General Pathology, University of Verona, 37134 Verona, Italy
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21
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Chen KB, Chang SS, Tseng YL, Chiu TH, Liao CC, Ho M, Huang GS, Li CY. Amniotic fluid induces platelet-neutrophil aggregation and neutrophil activation. Am J Obstet Gynecol 2013; 208:318.e1-7. [PMID: 23313310 DOI: 10.1016/j.ajog.2013.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 11/02/2012] [Accepted: 01/07/2013] [Indexed: 01/20/2023]
Abstract
OBJECTIVE Amniotic fluid embolism syndrome is a fatal disease in pregnant women. The exact role of platelets and neutrophils in amniotic fluid embolism syndrome is not clear. We examined whether amniotic fluid could affect platelet-neutrophil aggregation and activation and the possible mechanisms. STUDY DESIGN Blood samples from the pregnant women were pretreated ex vivo with their own amniotic fluid. Flow cytometry was used to measure platelet-neutrophil aggregation and activation. Neutrophil-mediated activity of p38 mitogen-activated protein kinase and extracellular signal-regulated protein kinases 1 and 2 was analyzed by Western blotting. RESULTS Amniotic fluid significantly induced platelet-neutrophil aggregation, neutrophil CD11b expression, and reactive oxygen species production. Amniotic fluid induced minimal platelet P-selectin expression. The increase of intracellular calcium level of neutrophils and the activity of p38 mitogen-activated protein kinase were enhanced by amniotic fluid stimulation. CONCLUSION Amniotic fluid was able to induce neutrophil activation and platelet-neutrophil aggregation with minimal effect on platelet activation. These findings may provide a new insight in the understanding of the pathophysiologic condition of amniotic fluid embolism syndrome.
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Tateno N, Matsumoto N, Motowaki T, Suzuki K, Aratani Y. Myeloperoxidase deficiency induces MIP-2 production via ERK activation in zymosan-stimulated mouse neutrophils. Free Radic Res 2013; 47:376-85. [DOI: 10.3109/10715762.2013.778990] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Abstract
Bacteria living as biofilms have been recognised as the ultimate cause of persistent and destructive inflammatory processes. Biofilm formation is a well-organised, genetically-driven process, which is well characterised for numerous bacteria species. In contrast, the host response to bacterial biofilms is less well analysed, and there is the general believe that bacteria in biofilms escape recognition or eradication by the immune defence. In this review the host response to bacterial biofilms is discussed with particular focus on the role of neutrophils because these phagocytic cells are the first to infiltrate areas of bacterial infection, and because neutrophils are equipped with a wide arsenal of bactericidal and toxic entities. I come to the conclusion that bacterial biofilms are not inherently protected against the attack by neutrophils, but that control of biofilm formation is possible depending on a timely and sufficient host response.
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Tamassia N, Bazzoni F, Le Moigne V, Calzetti F, Masala C, Grisendi G, Bussmeyer U, Scutera S, De Gironcoli M, Costantini C, Musso T, Cassatella MA. IFN-β expression is directly activated in human neutrophils transfected with plasmid DNA and is further increased via TLR-4-mediated signaling. THE JOURNAL OF IMMUNOLOGY 2012; 189:1500-9. [PMID: 22730532 DOI: 10.4049/jimmunol.1102985] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Upon LPS binding, TLR4 activates a MyD88-dependent pathway leading to the transcriptional activation of proinflammatory genes, as well as a MyD88-independent/TRIF-dependent pathway, responsible for the transcriptional induction of IFN-β. Previous findings delineated that human neutrophils are unable to induce the transcription of IFN-β in response to TLR4 stimulation. Because neutrophils do not express protein kinase C ε, a molecule recently reported as essential for initiating the MyD88-independent/TRIF-dependent pathway, we optimized an electroporation method to transfect PKCε into neutrophils with very high efficiency. By doing so, a significant IFN-β mRNA expression was induced, in the absence of LPS stimulation, not only in PKCε-overexpressing neutrophils but also in cells transfected with a series of empty DNA plasmids; however, LPS further upregulated the IFN-β transcript levels in plasmid-transfected neutrophils, regardless of PKCε overexpression. Phosphoimmunoblotting studies, as well as chromatin immunoprecipitation assays targeting the IFN-β promoter, revealed that IFN-β mRNA induction occurred through the cooperative action of IRF3, activated by transfected DNA, and NF-κB, activated by LPS. Additional immunoblotting and coimmunoprecipitation studies revealed that neutrophils constitutively express various cytosolic DNA sensors, including IFN-inducible protein 16, leucine-rich repeat (in Flightless I) interacting protein-1, and DDX41, as well as that IFN-inducible protein 16 is the intracellular receptor recognizing transfected DNA. Consistently, infection of neutrophils with intracellular pathogens, such as Bartonella henselae, Listeria monocytogenes, Legionella pneumophila, or adenovirus type 5, promoted a marked induction of IFN-β mRNA expression. Taken together, these data raise questions about the role of PKCε in driving the MyD88-independent/TRIF-dependent response and indicate that human neutrophils are able to recognize and respond to microbial cytosolic DNA.
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Affiliation(s)
- Nicola Tamassia
- Section of General Pathology, Department of Pathology and Diagnostics, University of Verona, 37134 Verona, Italy
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25
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Safaiyan S, Bolhassani A, Nylen S, Akuffo H, Rafati S. Contribution of human neutrophils in the development of protective immune response during in vitro Leishmania major infection. Parasite Immunol 2012; 33:609-20. [PMID: 21793857 DOI: 10.1111/j.1365-3024.2011.01321.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Stimulation of neutrophils may potentiate immunity to Leishmania major. CpG-containing oligodeoxynucleotide (ODN) has immune stimulatory effects and has been suggested as adjuvants and therapeutics to potentiate efficacy of vaccines and treatments against leishmaniasis. Here, we examined the stimulatory effect of synthetic ODN containing CpG motifs class A and B on cytokine production by neutrophils. Neutrophils from healthy donors responded to CpG-ODN type A, but not to class B, with secretion of IL-8 and following GM-CSF pretreatment with TNF-α production. To test whether neutrophil responses were altered in cutaneous leishmaniasis (CL) and to better understand the role of neutrophils in susceptibility and resistance to disease, we evaluated cytokine responses in GM-CSF preconditioned neutrophils from asymptomatic (Leishmanin skin test positive, LST+) and nonhealing CL individuals to CpG-ODN class A and assessed the expression levels of toll-like receptors (TLR2), 4 and 9. LST+ and healthy donor, but not nonhealing CL neutrophils, responded with TNF-α secretion. Neutrophils from nonhealing CL displayed increased mRNA expression levels of TLR2, 4 and 9 compared to neutrophils from LST+ or healthy donors. Therefore, failure to cure CL is associated with reduced ability of neutrophils to secrete TNF-α and correlates with high TLR 2, 4 and 9 expressions.
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Affiliation(s)
- S Safaiyan
- Molecular Immunology and Vaccine Research Laboratory, Pasteur Institute of Iran, Tehran, Iran
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Bruno A, Alessi M, Soresi S, Bonanno A, Riccobono L, Montalbano AM, Albano GD, Gjomarkaj M, Profita M. Increased leptin/leptin receptor pathway affects systemic and airway inflammation in COPD former smokers. J Inflamm Res 2011; 4:51-9. [PMID: 22096369 PMCID: PMC3218742 DOI: 10.2147/jir.s19523] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background Leptin, a hormone produced mainly by adipose tissue, regulates food intake and energy expenditure. It is involved in inflammatory diseases such as chronic obstructive pulmonary disease (COPD) and its deficiency is associated with increased susceptibility to the infection. The leptin receptor is expressed in the lung and in the neutrophils. Methods We measured the levels of leptin, tumor necrosis factor alpha (TNF-α) and soluble form of intercellular adhesion molecule-1 (sICAM-1) in sputum and plasma from 27 smoker and former smoker patients with stable COPD using ELISA methods. Further we analyzed leptin and its receptor expression in sputum cells from 16 COPD patients using immunocytochemistry. Results In plasma of COPD patients, leptin was inversely correlated with TNF-α and positively correlated with the patient weight, whereas the levels of sICAM-1 were positively correlated with TNF-α. In sputum of COPD patients leptin levels were correlated with forced expiratory volume in 1 second/forced vitality capacity. Additionally, increased levels of sputum leptin and TNF-α were observed in COPD former smokers rather than smokers. Further the expression of leptin receptor in sputum neutrophils was significantly higher in COPD former smokers than in smokers, and the expression of leptin and its receptor was positively correlated in neutrophils of COPD former smokers. Conclusion Our findings suggest a role of leptin in the local and systemic inflammation of COPD and, taking into account the involvement of neutrophils in this inflammatory disease, describe a novel aspect of the leptin/leptin receptor pathway in the regulation of host defense after smoking cessation.
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Affiliation(s)
- Andreina Bruno
- Institute of Biomedicine and Molecular Immunology, Italian National Research Council, Palermo, Italy
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Fortin CF, Cloutier A, Ear T, Sylvain-Prévost S, Mayer TZ, Bouchelaghem R, McDonald PP. A class IA PI3K controls inflammatory cytokine production in human neutrophils. Eur J Immunol 2011; 41:1709-19. [DOI: 10.1002/eji.201040945] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 02/15/2011] [Accepted: 03/11/2011] [Indexed: 12/30/2022]
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Salvenmoser S, Seidler MJ, Dalpke A, Müller FMC. Effects of caspofungin, Candida albicans and Aspergillus fumigatus on toll-like receptor 9 of GM-CSF-stimulated PMNs. ACTA ACUST UNITED AC 2011; 60:74-7. [PMID: 20626764 DOI: 10.1111/j.1574-695x.2010.00720.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The possible involvement of Toll-like receptors (TLRs) 1, 2, 4 and 9 in the interaction of antifungal drugs with polymorphonuclear neutrophils (PMNs) in response to Aspergillus fumigatus and Candida albicans as stimuli was investigated. Caspofungin revealed the broadest capacity to enable C. albicans and A. fumigatus to stimulate TLR upregulation, TLR 2 by A. fumigatus and TLRs 4, 9 by C. albicans. Conventional amphotericin B (cAMB) stimulated only A. fumigatus to induce TLRs 2 and 4 upregulation; voriconazole stimulated A. fumigatus and fluconazole C. albicans to induce TLR 9 upregulation. For cAMB, only TLR 9 was upregulated by A. fumigatus, whereas in the case of voriconazole, TLRs 2, 4, 9 were upregulated. Caspofungin revealed the broadest capacity: C. albicans was stimulated to upregulate TLRs at least at one of the concentrations, and A. fumigatus was stimulated to upregulate TLRs 2, 4. TLR 9 was upregulated two to three fold by all antifungal drugs on protein, except for fluconazole at the RNA level. Candida albicans preincubated with caspofungin has additional effects on CD11b expression and IL8 chemotaxis in CpG-DNA-stimulated PMNs. These results indicate a relevant upregulation with a functional relevance of TLR 9 in the presence of C. albicans strains preincubated with caspofungin at three concentrations.
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Affiliation(s)
- Stefanie Salvenmoser
- Pediatric Pulmonology, Department of Pediatrics III, Cystic Fibrosis Centre and Infectious Diseases, University Heidelberg, Heidelberg, Germany
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Jensen PØ, Givskov M, Bjarnsholt T, Moser C. The immune system vs. Pseudomonas aeruginosa biofilms. ACTA ACUST UNITED AC 2010; 59:292-305. [PMID: 20579098 DOI: 10.1111/j.1574-695x.2010.00706.x] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Ilya Metchnikoff and Paul Ehrlich were awarded the Nobel price in 1908. Since then, numerous studies have unraveled a multitude of mechanistically different immune responses to intruding microorganisms. However, in the vast majority of these studies, the underlying infectious agents have appeared in the planktonic state. Accordingly, much less is known about the immune responses to the presence of biofilm-based infections (which is probably also due to the relatively short period of time in which the immune response to biofilms has been studied). Nevertheless, more recent in vivo and in vitro studies have revealed both innate as well as adaptive immune responses to biofilms. On the other hand, measures launched by biofilm bacteria to achieve protection against the various immune responses have also been demonstrated. Whether particular immune responses to biofilm infections exist remains to be firmly established. However, because biofilm infections are often persistent (or chronic), an odd situation appears with the simultaneous activation of both arms of the host immune response, neither of which can eliminate the biofilm pathogen, but instead, in synergy, causes collateral tissue damage. Although the present review on the immune system vs. biofilm bacteria is focused on Pseudomonas aeruginosa (mainly because this is the most thoroughly studied), many of the same mechanisms are also seen with biofilm infections generated by other microorganisms.
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Fuxman Bass JI, Russo DM, Gabelloni ML, Geffner JR, Giordano M, Catalano M, Zorreguieta A, Trevani AS. Extracellular DNA: a major proinflammatory component of Pseudomonas aeruginosa biofilms. THE JOURNAL OF IMMUNOLOGY 2010; 184:6386-95. [PMID: 20421641 DOI: 10.4049/jimmunol.0901640] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We previously demonstrated that extracellular bacterial DNA activates neutrophils through a CpG- and TLR9-independent mechanism. Biofilms are microbial communities enclosed in a polymeric matrix that play a critical role in the pathogenesis of many infectious diseases. Because extracellular DNA is a key component of biofilms of different bacterial species, the aim of this study was to determine whether it plays a role in the ability of biofilms to induce human neutrophil activation. We found that degradation of matrix extracellular DNA with DNase I markedly reduced the capacity of Pseudomonas aeruginosa biofilms to induce the release of the neutrophil proinflammatory cytokines IL-8 and IL-1beta (>75%); reduced the upregulation of neutrophil activation markers CD18, CD11b, and CD66b (p < 0.001); reduced the number of bacteria phagocytosed per neutrophil contacting the biofilm; and reduced the production of neutrophil extracellular traps. Consistent with these findings, we found that biofilms formed by the lasI rhlI P. aeruginosa mutant strain, exhibiting a very low content of matrix extracellular DNA, displayed a lower capacity to stimulate the release of proinflammatory cytokines by neutrophils, which was not decreased further by DNase I treatment. Together, our findings support that matrix extracellular DNA is a major proinflammatory component of P. aeruginosa biofilms.
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Affiliation(s)
- Juan I Fuxman Bass
- Departamento de Inmunología, Instituto de Investigaciones Hematológicas and Instituto de Estudios Oncológicos Fundación Maissa, Academia Nacional de Medicina, Buenos Aires, Argentina
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Ramaprakash H, Hogaboam CM. Intranasal CpG therapy attenuated experimental fungal asthma in a TLR9-dependent and -independent manner. Int Arch Allergy Immunol 2009; 152:98-112. [PMID: 20016192 DOI: 10.1159/000265531] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2009] [Accepted: 08/19/2009] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND CpG administration abolishes airway inflammation and remodeling in acute models of allergic airway disease. METHODS Herein, we investigated the therapeutic effect of CpG in a chronic fungal model of asthma. TLR9+/+ and TLR9-/- mice were sensitized to soluble Aspergillus fumigatus antigens and challenged with live A. fumigatus conidia. Mice were treated with intraperitoneal (IP) or intranasal (IN) CpG, or left untreated 14-28 days after conidium challenge. All features of allergic airway disease were attenuated in TLR9+/+ mice treated with IN CpG, including airway hyperresponsiveness (AHR), mucus production, and peribronchial fibrosis. RESULTS TLR9-/- mice treated with IN CpG exhibited attenuated airway remodeling but not AHR. Whole-lung IL-12 levels were significantly elevated in both TLR9+/+ and TLR9-/- mice receiving IN CpG but not in either group receiving IP CpG. Whole-lung IL-10 levels were significantly elevated in IN CpG-treated TLR9+/+ mice but not in TLR9-/- mice receiving IN CpG. Increased whole-lung transcript and protein levels of the scavenger receptors SR-A and MARCO were observed in TLR9-/- mice compared with TLR9+/+ mice, possibly accounting for the CpG responsiveness in the knockout group. CONCLUSIONS Together, these data show that IN CpG has a therapeutic effect during established fungal asthma, which is TLR9 dependent and independent.
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Affiliation(s)
- Hemanth Ramaprakash
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109-2200, USA
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Gaudreault E, Gosselin J. Leukotriene B4 potentiates CpG signaling for enhanced cytokine secretion by human leukocytes. THE JOURNAL OF IMMUNOLOGY 2009; 183:2650-8. [PMID: 19620296 DOI: 10.4049/jimmunol.0804135] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
TLRs are known to be important in innate host defense against a variety of microbial infections. In particular, TLR9 has been associated with immune defense against different foreign organisms by recognition of unmethylated DNA sequences. In this report, we provide evidence that leukotriene B(4) (LTB(4)) has the capacity to modulate TLR9 expression on human neutrophils. The effect of LTB(4) was found to be specific, because related leukotrienes such as LTC(4) and LTD(4) or neutrophil agonists IL-8 and C5a failed to modulate TLR9 expression in neutrophils. Using fluorochrome-tagged CpG DNA, we observed that LTB(4) treatment also increased TLR9 ligand binding in neutrophils. Moreover, LTB(4) stimulation potentiates CpG-mediated signaling via an endosome-independent mechanism in human neutrophils, leading to enhanced secretion of proinflammatory cytokines. The increase in cytokine secretion by LTB(4) following CpG stimulation of neutrophils was associated with the activation of TGF-beta-activated kinase (TAK-1) as well as p38 and c-Jun (JNK) kinases. In contrast, in PBMC LTB(4) leads to an increase in cytokine secretion following CpG stimulation but via a MyD88- and endosome-dependent mechanism. As observed in neutrophils, PBMC stimulation with LTB(4) in the presence of CpG also results in enhanced TAK-1, p38, and JNK phosphorylation/activation. These data provide new evidence underlying the immunomodulatory properties of LTB(4) leading to antimicrobial defense.
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Affiliation(s)
- Eric Gaudreault
- Laboratory of Innate Immunology, Centre Hospitalier Universitaire de Quebec Research Center, Laval University, Quebec, Canada
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Koller B, Bals R, Roos D, Korting HC, Griese M, Hartl D. Innate immune receptors on neutrophils and their role in chronic lung disease. Eur J Clin Invest 2009; 39:535-47. [PMID: 19453653 DOI: 10.1111/j.1365-2362.2009.02145.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Neutrophils, the prototypic cells of the innate immune system, are recruited to infected sites to protect the human body from invading pathogens. To accomplish this function, neutrophils sense pathogens and endogenous damage-associated molecules via innate immune receptors, such as Toll-like receptors (TLRs) and other pattern recognition receptors. This defence function is essential for the pulmonary microenvironment where the host is faced with millions of particles and pathogens inhaled daily. Chronic lung diseases, such as cystic fibrosis or chronic obstructive pulmonary disease are characterized by a neutrophil accumulation and chronic bacterial colonization of the airways. Consequently, insights into the role of TLRs on neutrophils in chronic lung diseases are of high relevance for further diagnostic and therapeutic approaches. Here we summarize and discuss recent advances in the expression, regulation and functional role of TLRs on neutrophils in chronic lung diseases.
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Affiliation(s)
- B Koller
- Children's Hospital Research Center, Department of Dermatology, LMU University of Munich, Munich, Germany
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Thaxton JE, Romero R, Sharma S. TLR9 activation coupled to IL-10 deficiency induces adverse pregnancy outcomes. THE JOURNAL OF IMMUNOLOGY 2009; 183:1144-54. [PMID: 19561095 DOI: 10.4049/jimmunol.0900788] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Pregnancy outcome is severely compromised by intrauterine infections and inflammation. Although the pregnant uterine microenvironment is replete with innate immune cells and TLR expression, the mechanisms that facilitate adverse effects of their activation are largely unknown. In this study, we mimic the activation of TLR9 with its pathogenic ligand hypomethylated CpG and demonstrate that IL-10 proficiency protects against CpG-induced pregnancy complications. We show that fetal resorption and preterm birth are rapidly induced in IL-10(-/-) mice by low doses of CpG (approximately 25 microg/mouse) when injected i.p. on gestational day 6 or gestational day 14, respectively. In contrast, wild-type mice failed to experience such effects at comparable doses, but pups born at term displayed craniofacial/limb defects in response to higher doses (approximately 400 microg/mouse). Pregnancy complications in IL-10(-/-) mice were associated with unexpected and robust TLR9-triggered activation and amplification of uterine neutrophil and macrophage subpopulations followed by their migration to the placental zone. Furthermore, a dramatic increase in serum levels of mouse KC and TNF-alpha production by uterine F4/80(+) cells, but not uterine NK or Gr-1(+)CD11b(+) cells, was observed. Depletion of F4/80(+) macrophages or neutralization of TNF-alpha rescued pregnancy to term. Our results have important implications for IL-10-mediated "uterine tolerance" against CpG-driven innate immune activation.
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Affiliation(s)
- Jessica E Thaxton
- Department of Pediatrics, Women and Infants Hospital of Rhode Island, Warren Alpert Medical School of Brown University, Providence, RI 02905 USA
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Bass JIF, Alvarez ME, Gabelloni ML, Vermeulen ME, Amaral MM, Geffner JR, Trevani AS. GM-CSF enhances a CpG-independent pathway of neutrophil activation triggered by bacterial DNA. Mol Immunol 2008; 46:37-44. [DOI: 10.1016/j.molimm.2008.06.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2008] [Revised: 06/19/2008] [Accepted: 06/25/2008] [Indexed: 10/21/2022]
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Fuxman Bass JI, Gabelloni ML, Alvarez ME, Vermeulen ME, Russo DM, Zorreguieta A, Geffner JR, Trevani AS. Characterization of bacterial DNA binding to human neutrophil surface. J Transl Med 2008; 88:926-37. [PMID: 18626469 DOI: 10.1038/labinvest.2008.59] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Bacterial DNA activates neutrophils through a CpG- and TLR9-independent mechanism. Neutrophil activation does not require DNA internalization, suggesting that it results from the interaction of bacterial DNA with a neutrophil surface receptor. The aim of this study was to characterize the interaction of bacterial DNA with the neutrophil surface. Bacterial DNA binding showed saturation and was inhibited by unlabeled DNA but not by other polyanions like yeast tRNA and poly-A. Resembling the conditions under which bacterial DNA triggers neutrophil activation, binding was not modified in the presence or absence of calcium, magnesium or serum. Treatment of neutrophils with proteases not only dramatically reduced bacterial DNA binding but also inhibited neutrophil activation induced by bacterial DNA. Experiments performed with DNA samples of different lengths obtained after digestion of bacterial DNA with DNase showed that only DNA fragments greater than approximately 170-180 nucleotides competed bacterial DNA binding and retained the ability to trigger cell activation. Treatment of neutrophils with chemoattractants or conventional agonists significantly increased bacterial DNA binding. Moreover, neutrophils that underwent transmigration through human endothelial cell monolayers even in the absence of chemoattractants, exhibited higher binding levels of bacterial DNA. Together, our findings provide evidence that binding of bacterial DNA to neutrophils is a receptor-mediated process that conditions the ability of DNA to trigger cell activation. We speculate that neutrophil recognition of bacterial DNA might be modulated by the balance of agonists present at inflammatory foci. This effect might be relevant in bacterial infections with a biofilm etiology, in which extracellular DNA could function as a potent neutrophil agonist.
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Affiliation(s)
- Juan I Fuxman Bass
- Departamento de Inmunología, Instituto de Investigaciones Hematológicas and Instituto de Estudios Oncológicos 'Fundación Maissa', Academia Nacional de Medicina, Buenos Aires, Argentina
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Hartl D, Lehmann N, Hoffmann F, Jansson A, Hector A, Notheis G, Roos D, Belohradsky BH, Wintergerst U. Dysregulation of innate immune receptors on neutrophils in chronic granulomatous disease. J Allergy Clin Immunol 2007; 121:375-382.e9. [PMID: 18155283 DOI: 10.1016/j.jaci.2007.10.037] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2007] [Revised: 10/23/2007] [Accepted: 10/24/2007] [Indexed: 11/16/2022]
Abstract
BACKGROUND Chronic granulomatous disease (CGD) is the most common inherited disorder of neutrophil function, is caused by mutations in the reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, and results in recurrent bacterial infections. OBJECTIVE We sought to investigate the expression and function of innate immune receptors on neutrophils in patients with CGD. METHODS We quantified mRNA and protein expression of Toll-like receptors (TLRs), complement receptors, and chemokine receptors on neutrophils from 15 patients with CGD compared with that seen in healthy control subjects (n = 15) and control patients with bacterial pneumonia (n = 15). Phagocytosis, chemotaxis, and TLR function of isolated neutrophils were analyzed. The effect of NADPH oxidase inhibition on receptor expression and function was analyzed in control neutrophils. RESULTS Neutrophils from patients with CGD had lower expression levels of TLR5, TLR9, CD11b, CD18, CD35, and CXCR1 compared with those from healthy control subjects, whereas similar or increased receptor expressions were found in patients without CGD but with bacterial pneumonia. Reduced TLR5 expression resulted in impaired neutrophil activation by bacterial flagella, reduced CD11b/CD18 expression was associated with impaired phagocytosis of Staphylococcus aureus, and reduced CXCR1 expression was associated with decreased chemotaxis. TLR5 and CD18 expression levels correlated with disease severity in patients with CGD. TLR5 and TLR9 expression were greater in patients with residual NADPH oxidase activity. Inhibition of the NADPH oxidase in control neutrophils in vitro decreased TLR5 and TLR9 expression and impaired TLR5 function. CONCLUSION These results provide the first evidence that innate immune receptors are dysregulated in patients with CGD.
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Affiliation(s)
- Dominik Hartl
- Children's Hospital of the Ludwig-Maximilians-University, Munich, Germany.
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Hoarau C, Gérard B, Lescanne E, Henry D, François S, Lacapère JJ, El Benna J, Dang PMC, Grandchamp B, Lebranchu Y, Gougerot-Pocidalo MA, Elbim C. TLR9 activation induces normal neutrophil responses in a child with IRAK-4 deficiency: involvement of the direct PI3K pathway. THE JOURNAL OF IMMUNOLOGY 2007; 179:4754-65. [PMID: 17878374 DOI: 10.4049/jimmunol.179.7.4754] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Polymorphonuclear neutrophils (PMN) play a key role in innate immunity. Their activation and survival are tightly regulated by microbial products via pattern recognition receptors such as TLRs, which mediate recruitment of the IL-1R-associated kinase (IRAK) complex. We describe a new inherited IRAK-4 deficiency in a child with recurrent pyogenic bacterial infections. Analysis of the IRAK4 gene showed compound heterozygosity with two mutations: a missense mutation in the death domain of the protein (pArg12Cys) associated in cis-with a predicted benign variant (pArg391His); and a splice site mutation in intron 7 that led to the skipping of exon 7. A nontruncated IRAK-4 protein was detected by Western blotting. The patient's functional deficiency of IRAK-4 protein was confirmed by the absence of IRAK-1 phosphorylation after stimulation with all TLR agonists tested. The patient's PMNs showed strongly impaired responses (L-selectin and CD11b expression, oxidative burst, cytokine production, cell survival) to TLR agonists which engage TLR1/2, TLR2/6, TLR4, and TLR7/8; in contrast, the patient's PMN responses to CpG-DNA (TLR9) were normal, except for cytokine production. The surprisingly normal effect of CpG-DNA on PMN functions and apoptosis disappeared after pretreatment with PI3K inhibitors. Together, these results suggest the existence of an IRAK-4-independent TLR9-induced transduction pathway leading to PI3K activation. This alternative pathway may play a key role in PMN control of infections by microorganisms other than pyogenic bacteria in inherited IRAK-4 deficiency.
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Affiliation(s)
- Cyrille Hoarau
- Unité de Formation et de Recherche de Médecine, Cellules Dendritiques et Greffes, Université François Rabelais, Tours, France
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Sukhumavasi W, Egan CE, Denkers EY. Mouse Neutrophils Require JNK2 MAPK for Toxoplasma gondii-Induced IL-12p40 and CCL2/MCP-1 Release. THE JOURNAL OF IMMUNOLOGY 2007; 179:3570-7. [PMID: 17785791 DOI: 10.4049/jimmunol.179.6.3570] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The MAPK family member JNK/stress-activated MAPK (SAPK) is involved in extracellular stress and proinflammatory cytokine responses, including production of cytokines such as IL-12. The JNK1 and 2 isoforms are widely expressed, but JNK3 is largely restricted to tissues of the brain, testis, and heart. In this study, we focus on mouse neutrophils, a cell type in which JNK/SAPK expression and activity has been given little study. We used Western blot analysis to examine expression patterns of JNK/SAPK in wild-type and JNK2-/- polymorphonuclear leukocytes (PMN). Surprisingly, neutrophils displayed a major deficiency in JNK1 expression, in contrast to macrophages that expressed high levels of both JNK1 and JNK2 MAPK. JNK1 expression was steadily reduced during the neutrophil maturation in bone marrow. We used PMN infection with the protozoan parasite Toxoplasma gondii to determine whether neutrophil JNK2 was functional. The parasite induced rapid JNK2 phosphorylation and intracellular FACS staining demonstrated preferential activation in infected neutrophils. Use of JNK2-/- neutrophils revealed that this MAPK family member was required for PMN IL-12p40 and CCL2/MCP-1 production. The chemotactic response displayed a minor JNK2 dependence but phagocytosis and oxidative burst activity did not require this MAPK. These findings are important because they demonstrate 1) a previously unrecognized unusual JNK expression pattern in mouse neutrophils, 2) JNK2 in PMN is activated by Toxoplasma invasion, and 3) a requirement for JNK2 in PMN IL-12p40 and CCL2/MCP-1 production in response to a microbial pathogen.
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Affiliation(s)
- Woraporn Sukhumavasi
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
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Pivarcsi A. Toll-like receptor 9-independent suppression of skin inflammation by oligonucleotides. J Invest Dermatol 2007; 127:746-8. [PMID: 17363956 DOI: 10.1038/sj.jid.5700679] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
It has been well established that cytidine-phosphate-guanosine (CpG) oligodeoxynucleotides (ODNs) activate innate and adaptive immune responses in keratinocytes by stimulating Toll-like receptor 9 (TLR9)-dependent signaling pathways. However, as Dorn et al. report, keratinocytes possess another, yet uncharacterized, TLR9-independent mechanism for the recognition of ODNs. Surprisingly, the activation of the pathway leads to suppressed chemokine production in vitro and decreased skin inflammation in vivo.
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Affiliation(s)
- Andor Pivarcsi
- Clinical Allergy Research Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden.
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Abstract
There have been recent, significant advances about the role of mRNA turnover in controlling gene expression in immune cells. Post‐transcriptional regulation of gene expression contributes to the characteristics of many of the processes underlying the immune response by ensuring early, rapid, and transient action. The emphasis of this review is on current work that deals with the regulation of mRNA decay during innate immunity against microbes and T cell activation as a model of the adaptive response.
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Affiliation(s)
- Khalid S A Khabar
- Program in BioMolecular Research, King Faisal Specialist Hospital and Research Center, P3354, mBC-03, Riyadh 11211, Saudi Arabia.
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