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Yu S, Xu C, Tang X, Wang L, Hu L, Li L, Zhou X, Li Q. Exendin-4 blockade of T1R2/T1R3 activation improves Pseudomonas aeruginosa-related pneumonia in an animal model of chemically induced diabetes. Inflamm Res 2024; 73:1185-1201. [PMID: 38748233 PMCID: PMC11214611 DOI: 10.1007/s00011-024-01891-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 05/06/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024] Open
Abstract
OBJECTIVE Poorly controlled diabetes frequently exacerbates lung infection, thereby complicating treatment strategies. Recent studies have shown that exendin-4 exhibits not only hypoglycemic but also anti-inflammatory properties. This study aimed to explore the role of exendin-4 in lung infection with diabetes, as well as its association with NOD1/NF-κB and the T1R2/T1R3 sweet taste receptor. METHODS 16HBE human bronchial epithelial cells cultured with 20 mM glucose were stimulated with lipopolysaccharide (LPS) isolated from Pseudomonas aeruginosa (PA). Furthermore, Sprague‒Dawley rats were fed a high-fat diet, followed by intraperitoneal injection of streptozotocin and intratracheal instillation of PA. The levels of TNF-α, IL-1β and IL-6 were evaluated using ELISAs and RT‒qPCR. The expression of T1R2, T1R3, NOD1 and NF-κB p65 was assayed using western blotting and immunofluorescence staining. Pathological changes in the lungs of the rats were observed using hematoxylin and eosin (H&E) staining. RESULTS At the same dose of LPS, the 20 mM glucose group produced more proinflammatory cytokines (TNF-α, IL-1β and IL-6) and had higher levels of T1R2, T1R3, NOD1 and NF-κB p65 than the normal control group (with 5.6 mM glucose). However, preintervention with exendin-4 significantly reduced the levels of the aforementioned proinflammatory cytokines and signaling molecules. Similarly, diabetic rats infected with PA exhibited increased levels of proinflammatory cytokines in their lungs and increased expression of T1R2, T1R3, NOD1 and NF-κB p65, and these effects were reversed by exendin-4. CONCLUSIONS Diabetic hyperglycemia can exacerbate inflammation during lung infection, promote the increase in NOD1/NF-κB, and promote T1R2/T1R3. Exendin-4 can ameliorate PA-related pneumonia with diabetes and overexpression of NOD1/NF-κB. Additionally, exendin-4 suppresses T1R2/T1R3, potentially through its hypoglycemic effect or through a direct mechanism. The correlation between heightened expression of T1R2/T1R3 and an intensified inflammatory response in lung infection with diabetes requires further investigation.
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Affiliation(s)
- Shanjun Yu
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Chaoqun Xu
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Emergency and Trauma College, Hainan Medical University, Haikou, Hainan, 579199, China
| | - Xiang Tang
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Lijun Wang
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Lihua Hu
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Liang Li
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Xiangdong Zhou
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China.
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China.
| | - Qi Li
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China.
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China.
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Ahn JH, Jung DH, Kim DY, Lee TS, Kim YJ, Lee YJ, Seo IS, Kim WG, Cho YJ, Shin SJ, Park JH. Impact of IL-1β on lung pathology caused by Mycobacterium abscessus infection and its association with IL-17 production. Microbes Infect 2024; 26:105351. [PMID: 38724000 DOI: 10.1016/j.micinf.2024.105351] [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: 02/08/2024] [Revised: 04/27/2024] [Accepted: 05/01/2024] [Indexed: 05/18/2024]
Abstract
Mycobacterium abscessus (MAB), a non-tuberculous mycobacterium (NTM), causes chronic pulmonary inflammation in humans. The NLRP3 inflammasome is a multi-protein complex that triggers IL-1β maturation and pyroptosis through the cleavage of caspase-1. In this study, we investigated the roles of NLRP3 and IL-1β in the host's defense against MAB. The IL-1β production by MAB was completely abolished in NLRP3, but not NLRC4, deficient macrophages. The NLRP3 inflammasome components, which are ASC and caspase-1 were also found to be essential for IL-1β production in response to MAB. NLRP3 and IL-1β deficiency did not affect the intracellular growth of MAB in macrophages, and the bacterial burden in lungs of NLRP3- and IL-1β-deficient mice was also comparable to the burden observed in WT mice. In contrast, IL-1β deficiency ameliorated lung pathology in MAB-infected mice. Notably, the lung homogenates of IL-1β-deficient mice had reduced levels of IL-17, but not IFN-γ and IL-4 when compared with WT counterparts. Furthermore, in vitro co-culture analysis showed that IL-1β signaling was essential for IL-17 production in response to MAB. Finally, we observed that the anti-IL-17 antibody administration moderately mitigated MAB-induced lung pathology. These findings indicated that IL-1β production contribute to MAB-induced lung pathology via the elevation of IL-17 production.
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Affiliation(s)
- Jae-Hun Ahn
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea; Department of Experimental Animal Research, Biomedical Research Institute, Seoul National University Hospital, Seoul 03080, Republic of Korea
| | - Do-Hyeon Jung
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Dong-Yeon Kim
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Tae-Sung Lee
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Yeong-Jun Kim
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Yun-Ji Lee
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - In-Su Seo
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Wan-Gyu Kim
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Young Jin Cho
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Sung Jae Shin
- Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
| | - Jong-Hwan Park
- Laboratory Animal Medicine, College of Veterinary Medicine and Animal Medical Institute, Chonnam National University, Gwangju 61186, Republic of Korea; NODCURE, INC., 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
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Kleuser B, Schumacher F, Gulbins E. New Therapeutic Options in Pulmonal Diseases: Sphingolipids and Modulation of Sphingolipid Metabolism. Handb Exp Pharmacol 2024; 284:289-312. [PMID: 37922034 DOI: 10.1007/164_2023_700] [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] [Indexed: 11/05/2023]
Abstract
Sphingolipids are crucial molecules in the respiratory airways. As in most other tissues and organs, in the lung sphingolipids play an essential role as structural constituents as they regulate barrier function and fluidity of cell membranes. A lung-specific feature is the occurrence of sphingolipids as minor structural components in the surfactant. However, sphingolipids are also key signaling molecules involved in airway cell signaling and their dynamical formation and metabolism are important for normal lung physiology. Dysregulation of sphingolipid metabolism and signaling is involved in altering lung tissue and initiates inflammatory processes promoting the pathogenesis of pulmonal diseases including cystic fibrosis (CF), chronic obstructive pulmonary disease (COPD), and asthma.In the present review, the important role of specific sphingolipid species in pulmonal diseases will be discussed. Only such an understanding opens up the possibility of developing new therapeutic strategies with the aim of correcting the imbalance in sphingolipid metabolism and signaling. Such delivery strategies have already been studied in animal models of these lung diseases, demonstrating that targeting the sphingolipid profile represents new therapeutic opportunities for lung disorders.
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Affiliation(s)
- Burkhard Kleuser
- Institute of Pharmacy, Pharmacology and Toxicology, Freie Universität Berlin, Berlin, Germany.
| | - Fabian Schumacher
- Institute of Pharmacy, Pharmacology and Toxicology, Freie Universität Berlin, Berlin, Germany
| | - Erich Gulbins
- Institute of Molecular Biology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
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Kim DK, Huh JW, Yu H, Lee Y, Jin Y, Ha UH. Pseudomonas aeruginosa-Derived DnaJ Induces the Expression of IL-1β by Engaging the Interplay of p38 and ERK Signaling Pathways in Macrophages. Int J Mol Sci 2023; 24:15957. [PMID: 37958940 PMCID: PMC10648868 DOI: 10.3390/ijms242115957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/01/2023] [Accepted: 11/02/2023] [Indexed: 11/15/2023] Open
Abstract
As members of pathogen-associated molecular patterns, bacterial heat shock proteins (HSPs) are widely recognized for their role in initiating innate immune responses. This study aimed to examine the impact of DnaJ, a homolog of HSP40 derived from Pseudomonas aeruginosa (P. aeruginosa), on the regulation of IL-1β expression in macrophages. We demonstrated that DnaJ modulates macrophages to secrete IL-1β by activating NF-κB and MAPK signaling pathways. Specifically, ERK was identified as a positive mediator for IL-1β expression, while p38 acted as a negative mediator. These results suggest that the reciprocal actions of these two crucial MAPKs play a vital role in controlling IL-1β expression. Additionally, the reciprocal actions of MAPKs were found to regulate the activation of inflammasome-related molecules, including vimentin, NLRP3, caspase-1, and GSDMD. Furthermore, our investigation explored the involvement of CD91/CD40 in ERK signaling-mediated IL-1β production from DnaJ-treated macrophages. These findings emphasize the importance of understanding the signaling mechanisms underlying IL-1β induction and suggest the potential utility of DnaJ as an adjuvant for stimulating inflammasome activation.
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Affiliation(s)
- Dae-Kyum Kim
- Department of Biotechnology and Bioinformatics, Korea University, Sejong 30019, Republic of Korea; (D.-K.K.); (J.-W.H.); (H.Y.); (Y.L.)
- Interdisciplinary Graduate Program for Artificial Intelligence Smart Convergence Technology, Korea University, Sejong 30019, Republic of Korea
| | - Jin-Won Huh
- Department of Biotechnology and Bioinformatics, Korea University, Sejong 30019, Republic of Korea; (D.-K.K.); (J.-W.H.); (H.Y.); (Y.L.)
| | - Hyeonseung Yu
- Department of Biotechnology and Bioinformatics, Korea University, Sejong 30019, Republic of Korea; (D.-K.K.); (J.-W.H.); (H.Y.); (Y.L.)
| | - Yeji Lee
- Department of Biotechnology and Bioinformatics, Korea University, Sejong 30019, Republic of Korea; (D.-K.K.); (J.-W.H.); (H.Y.); (Y.L.)
| | - Yongxin Jin
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, Nankai University, Tianjin 300071, China;
| | - Un-Hwan Ha
- Department of Biotechnology and Bioinformatics, Korea University, Sejong 30019, Republic of Korea; (D.-K.K.); (J.-W.H.); (H.Y.); (Y.L.)
- Interdisciplinary Graduate Program for Artificial Intelligence Smart Convergence Technology, Korea University, Sejong 30019, Republic of Korea
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Wu J, Gao J, Yi L, Gao N, Wang L, Zhu J, Dai C, Sun L, Guo H, Yu FSX, Wu X. Protective effects of resolvin D1 in Pseudomonas aeruginosa keratitis. Mol Immunol 2023; 158:35-42. [PMID: 37104999 DOI: 10.1016/j.molimm.2023.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 03/31/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023]
Abstract
PURPOSE Here, we explored the protective effects of resolvin D1 (RvD1) in Pseudomonas aeruginosa (PA) keratitis. METHODS C57BL/6 (B6) mice were used as an animal model of PA keratitis. Plate counting and clinical scores were used to assess the severity of the infection and the therapeutic effects of RvD1 in the model. Myeloperoxidase assay was used to detect neutrophil infiltration and activity. Quantitative PCR (qPCR) was used to examine the expression of proflammatory and anti-inflammatory mediators. Immunofluorescence staining and qPCR were performed to identify macrophage polarization. RESULTS RvD1 treatment alleviated PA keratitis severity by decreasing corneal bacterial load and inhibiting neutrophil infiltration in the mouse model. Furthermore, RvD1 treatment decreased mRNA levels of TNF-α, IFN-γ, IL-1β, CXCL1, and S100A8/9 while increasing those of IL-1RA, IL-10, and TGF-β1. RvD1 treatment also reduced the aggregation of M1 macrophages and increased that of M2 macrophages. RvD1 provided an auxiliary effect in gatifloxacin-treated mice with PA keratitis. CONCLUSION Based on these findings, RvD1 may improve the prognosis of PA keratitis by inhibiting neutrophil recruitment and activity, dampening the inflammatory response, and promoting M2 macrophage polarization. Thus, RvD1 may be a potential complementary therapy for PA keratitis.
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Affiliation(s)
- Jiayin Wu
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong 250014, China; Department of Ophthalmology, Liaocheng People's Hospital, Liaocheng, Shandong 252000, China
| | - Jianlu Gao
- Department of Ophthalmology, Liaocheng People's Hospital, Liaocheng, Shandong 252000, China
| | - Lili Yi
- Joint Laboratory for Translational Medicine Research, Liaocheng People's Hospital, Liaocheng 252000, China
| | - Nan Gao
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Leyi Wang
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong 250014, China
| | - Jing Zhu
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong 250014, China
| | - Chenyang Dai
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong 250014, China
| | - Lin Sun
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong 250014, China
| | - Hui Guo
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong 250014, China
| | - Fu-Shin X Yu
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Xinyi Wu
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong 250014, China.
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White A, Wang Z, Wang X, King M, Guo C, Mantsounga C, Ayala A, Morrison AR, Choudhary G, Sellke F, Chambers E, Ware LB, Rounds S, Lu Q. NLRP3 inflammasome activation in cigarette smoke priming for Pseudomonas aeruginosa-induced acute lung injury. Redox Biol 2022; 57:102467. [PMID: 36175355 PMCID: PMC9618465 DOI: 10.1016/j.redox.2022.102467] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 08/30/2022] [Accepted: 09/02/2022] [Indexed: 02/04/2023] Open
Abstract
It is increasingly recognized that cigarette smoke (CS) exposure increases the incidence and severity of acute respiratory distress syndrome (ARDS) in critical ill humans and animals. However, the mechanism(s) is not well understood. This study aims to investigate mechanism underlying the priming effect of CS on Pseudomonas aeruginosa-triggered acute lung injury, by using pre-clinic animal models and genetically modified mice. We demonstrated that CS impaired P. aeruginosa-induced mitophagy flux, promoted p62 accumulation, and exacerbated P. aeruginosa-triggered mitochondrial damage and NLRP3 inflammasome activation in alveolar macrophages; an effect associated with increased acute lung injury and mortality. Pharmacological inhibition of caspase-1, a component of inflammasome, attenuated CS primed P. aeruginosa-triggered acute lung injury and improved animal survival. Global or myeloid-specific knockout of IL-1β, a downstream component of inflammasome activation, also attenuated CS primed P. aeruginosa-triggered acute lung injury. Our results suggest that NLRP3 inflammasome activation is an important mechanism for CS primed P. aeruginosa-triggered acute lung injury. (total words: 155).
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Affiliation(s)
- Alexis White
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA
| | - Zhengke Wang
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA
| | - Xing Wang
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA
| | - Michelle King
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA
| | - Cynthia Guo
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA
| | - Chris Mantsounga
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA
| | - Alfred Ayala
- Department of Surgery, The Warren Alpert Medical School of Brown University and Lifespan-Rhode Island Hospital, Providence, RI, USA
| | - Alan R Morrison
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA; Department of Medicine, The Warren Alpert Medical School of Brown University, Providence, RI, USA
| | - Gaurav Choudhary
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA; Department of Medicine, The Warren Alpert Medical School of Brown University, Providence, RI, USA
| | - Frank Sellke
- Cardiothoracic Surgery, The Warren Alpert Medical School of Brown University and Lifespan-Rhode Island Hospital, Providence, RI, USA
| | - Eboni Chambers
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA
| | - Lorraine B Ware
- Division of Allergy, Pulmonary, and Critical Care Medicine, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Sharon Rounds
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA; Department of Medicine, The Warren Alpert Medical School of Brown University, Providence, RI, USA
| | - Qing Lu
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Providence, RI, USA; Department of Medicine, The Warren Alpert Medical School of Brown University, Providence, RI, USA.
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Boff D, Russo RC, Crijns H, de Oliveira VLS, Mattos MS, Marques PE, Menezes GB, Vieira AT, Teixeira MM, Proost P, Amaral FA. The Therapeutic Treatment with the GAG-Binding Chemokine Fragment CXCL9(74-103) Attenuates Neutrophilic Inflammation and Lung Dysfunction during Klebsiella pneumoniae Infection in Mice. Int J Mol Sci 2022; 23:ijms23116246. [PMID: 35682923 PMCID: PMC9181286 DOI: 10.3390/ijms23116246] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/23/2022] [Accepted: 05/30/2022] [Indexed: 12/22/2022] Open
Abstract
Klebsiella pneumoniae is an important pathogen associated with hospital-acquired pneumonia (HAP). Bacterial pneumonia is characterized by a harmful inflammatory response with a massive influx of neutrophils, production of cytokines and chemokines, and consequent tissue damage and dysfunction. Targeted therapies to block neutrophil migration to avoid tissue damage while keeping the antimicrobial properties of tissue remains a challenge in the field. Here we tested the effect of the anti-inflammatory properties of the chemokine fragment CXCL9(74–103) in pneumonia induced by Klebsiella pneumoniae in mice. Mice were infected by intratracheal injection of Klebsiella pneumoniae and 6 h after infection were treated systemically with CXCL9(74–103). The recruitment of leukocytes, levels of cytokines and chemokines, colony-forming units (CFU), and lung function were evaluated. The treatment with CXCL9(74–103) decreased neutrophil migration to the airways and the production of the cytokine interleukin-1β (IL-1β) without affecting bacterial control. In addition, the therapeutic treatment improved lung function in infected mice. Our results indicated that the treatment with CXCL9(74–103) reduced inflammation and improved lung function in Klebsiella pneumoniae-induced pneumonia.
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Affiliation(s)
- Daiane Boff
- Imunofarmacologia, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil; (D.B.); (V.L.S.d.O.); (M.M.T.)
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, 3000 Leuven, Belgium; (H.C.); (M.S.M.); (P.E.M.)
| | - Remo Castro Russo
- Laboratory of Pulmonary Immunology and Mechanics, Department of Physiology and Biophysics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil;
| | - Helena Crijns
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, 3000 Leuven, Belgium; (H.C.); (M.S.M.); (P.E.M.)
| | - Vivian Louise Soares de Oliveira
- Imunofarmacologia, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil; (D.B.); (V.L.S.d.O.); (M.M.T.)
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, 3000 Leuven, Belgium; (H.C.); (M.S.M.); (P.E.M.)
| | - Matheus Silvério Mattos
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, 3000 Leuven, Belgium; (H.C.); (M.S.M.); (P.E.M.)
| | - Pedro Elias Marques
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, 3000 Leuven, Belgium; (H.C.); (M.S.M.); (P.E.M.)
| | - Gustavo Batista Menezes
- Center of Gastrointestinal Biology, Department of Morphology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil;
| | - Angélica Thomaz Vieira
- Laboratory of Microbiota and Immunomodulation, Department of Biochemistry and Immunology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil;
| | - Mauro Martins Teixeira
- Imunofarmacologia, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil; (D.B.); (V.L.S.d.O.); (M.M.T.)
| | - Paul Proost
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, 3000 Leuven, Belgium; (H.C.); (M.S.M.); (P.E.M.)
- Correspondence: (P.P.); (F.A.A.)
| | - Flávio Almeida Amaral
- Imunofarmacologia, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil; (D.B.); (V.L.S.d.O.); (M.M.T.)
- Correspondence: (P.P.); (F.A.A.)
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8
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Maurice NM, Bedi B, Yuan Z, Lin KC, Goldberg JB, Hart CM, Bailey KL, Sadikot RT. The Effect of PGC-1alpha-SIRT3 Pathway Activation on Pseudomonas aeruginosa Infection. Pathogens 2022; 11:pathogens11020116. [PMID: 35215060 PMCID: PMC8875424 DOI: 10.3390/pathogens11020116] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 01/14/2022] [Accepted: 01/16/2022] [Indexed: 02/01/2023] Open
Abstract
The innate immune response to P. aeruginosa pulmonary infections relies on a network of pattern recognition receptors, including intracellular inflammasome complexes, which can recognize both pathogen- and host-derived signals and subsequently promote downstream inflammatory signaling. Current evidence suggests that the inflammasome does not contribute to bacterial clearance and, in fact, that dysregulated inflammasome activation is harmful in acute and chronic P. aeruginosa lung infection. Given the role of mitochondrial damage signals in recruiting inflammasome signaling, we investigated whether mitochondrial-targeted therapies could attenuate inflammasome signaling in response to P. aeruginosa and decrease pathogenicity of infection. In particular, we investigated the small molecule, ZLN005, which transcriptionally activates peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α), a master regulator of mitochondrial biogenesis, antioxidant defense, and cellular respiration. We demonstrate that P. aeruginosa infection promotes the expression of inflammasome components and attenuates several components of mitochondrial repair pathways in vitro in lung epithelial cells and in vivo in an acute pneumonia model. ZLN005 activates PGC-1α and its downstream effector, Sirtuin 3 (SIRT3), a mitochondrial-localized deacetylase important for cellular metabolic processes and for reactive oxygen species homeostasis. ZLN005 also attenuates inflammasome signaling induced by P. aeruginosa in bronchial epithelial cells and this action is dependent on ZLN005 activation of SIRT3. ZLN005 treatment reduces epithelial-barrier dysfunction caused by P. aeruginosa and decreases pathogenicity in an in vivo pneumonia model. Therapies that activate the PGC-1α—SIRT3 axis may provide a complementary approach in the treatment of P. aeruginosa infection.
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Affiliation(s)
- Nicholas M. Maurice
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA; (N.M.M.); (B.B.); (K.-C.L.); (C.M.H.)
- Atlanta Veterans Affairs Health Care System, Decatur, GA 30033, USA
| | - Brahmchetna Bedi
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA; (N.M.M.); (B.B.); (K.-C.L.); (C.M.H.)
- Atlanta Veterans Affairs Health Care System, Decatur, GA 30033, USA
| | - Zhihong Yuan
- VA Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA; (Z.Y.); (K.L.B.)
- Division of Pulmonary, Critical Care & Sleep, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Kuo-Chuan Lin
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA; (N.M.M.); (B.B.); (K.-C.L.); (C.M.H.)
- Atlanta Veterans Affairs Health Care System, Decatur, GA 30033, USA
| | - Joanna B. Goldberg
- Department of Pediatrics, Division of Pulmonology, Allergy/Immunology, Cystic Fibrosis, and Sleep, Emory University, Atlanta, GA 30322, USA;
- Children’s Healthcare of Atlanta, Center for CF and Airways Disease Research, Atlanta, GA 30322, USA
| | - C. Michael Hart
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA; (N.M.M.); (B.B.); (K.-C.L.); (C.M.H.)
- Atlanta Veterans Affairs Health Care System, Decatur, GA 30033, USA
| | - Kristina L. Bailey
- VA Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA; (Z.Y.); (K.L.B.)
- Division of Pulmonary, Critical Care & Sleep, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Ruxana T. Sadikot
- VA Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA; (Z.Y.); (K.L.B.)
- Division of Pulmonary, Critical Care & Sleep, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Correspondence:
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9
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Nagre N, Nicholson G, Cong X, Lockett J, Pearson AC, Chan V, Kim WK, Vinod KY, Catravas JD. Activation of cannabinoid-2 receptor protects against Pseudomonas aeruginosa induced acute lung injury and inflammation. Respir Res 2022; 23:326. [PMID: 36463179 PMCID: PMC9719649 DOI: 10.1186/s12931-022-02253-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 11/16/2022] [Indexed: 12/07/2022] Open
Abstract
BACKGROUND Bacterial pneumonia is a major risk factor for acute lung injury (ALI) and acute respiratory distress syndrome (ARDS). Pseudomonas aeruginosa (PA), an opportunistic pathogen with an increasing resistance acquired against multiple drugs, is one of the main causative agents of ALI and ARDS in diverse clinical settings. Given the anti-inflammatory role of the cannabinoid-2 receptor (CB2R), the effect of CB2R activation in the regulation of PA-induced ALI and inflammation was tested in a mouse model as an alternative to conventional antibiotic therapy. METHODS In order to activate CB2R, a selective synthetic agonist, JWH133, was administered intraperitoneally (i.p.) to C57BL/6J mice. Furthermore, SR144528 (a selective CB2R antagonist) was administered in combination with JWH133 to test the specificity of the CB2R-mediated effect. PA was administered intratracheally (i.t.) for induction of pneumonia in mice. At 24 h after PA exposure, lung mechanics were measured using the FlexiVent system. The total cell number, protein content, and neutrophil population in the bronchoalveolar lavage fluid (BALF) were determined. The bacterial load in the whole lung was also measured. Lung injury was evaluated by histological examination and PA-induced inflammation was assessed by measuring the levels of BALF cytokines and chemokines. Neutrophil activation (examined by immunofluorescence and immunoblot) and PA-induced inflammatory signaling (analyzed by immunoblot) were also studied. RESULTS CB2R activation by JWH133 was found to significantly reduce PA-induced ALI and the bacterial burden. CB2R activation also suppressed the PA-induced increase in immune cell infiltration, neutrophil population, and inflammatory cytokines. These effects were abrogated by a CB2R antagonist, SR144528, further confirming the specificity of the CB2R-mediated effects. CB2R-knock out (CB2RKO) mice had a significantly higher level of PA-induced inflammation as compared to that in WT mice. CB2R activation diminished the excess activation of neutrophils, whereas mice lacking CB2R had elevated neutrophil activation. Pharmacological activation of CB2R significantly reduced the PA-induced NF-κB and NLRP3 inflammasome activation, whereas CB2KO mice had elevated NLRP3 inflammasome. CONCLUSION Our findings indicate that CB2R activation ameliorates PA-induced lung injury and inflammation, thus paving the path for new therapeutic avenues against PA pneumonia.
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Affiliation(s)
- Nagaraja Nagre
- grid.255414.30000 0001 2182 3733Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507 USA
| | - Gregory Nicholson
- grid.255414.30000 0001 2182 3733Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507 USA
| | - Xiaofei Cong
- grid.255414.30000 0001 2182 3733Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507 USA
| | - Janette Lockett
- grid.255414.30000 0001 2182 3733Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507 USA
| | - Andrew C. Pearson
- grid.255414.30000 0001 2182 3733Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507 USA
| | - Vincent Chan
- grid.255414.30000 0001 2182 3733Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507 USA
| | - Woong-Ki Kim
- grid.255414.30000 0001 2182 3733Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA 23507 USA
| | - K. Yaragudri Vinod
- grid.250263.00000 0001 2189 4777Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10962 USA ,grid.137628.90000 0004 1936 8753Department of Child and Adolescent Psychiatry, New York University Langone Health, New York, NY USA
| | - John D. Catravas
- grid.261368.80000 0001 2164 3177Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA 23508 USA ,grid.261368.80000 0001 2164 3177School of Medical Diagnostic and Translational Sciences, College of Health Sciences, Old Dominion University, Norfolk, VA 23508 USA
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10
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TLR22-mediated activation of TNF-α-caspase-1/IL-1β inflammatory axis leads to apoptosis of Aeromonas hydrophila-infected macrophages. Mol Immunol 2021; 137:114-123. [PMID: 34242920 DOI: 10.1016/j.molimm.2021.06.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 04/28/2021] [Accepted: 06/29/2021] [Indexed: 02/08/2023]
Abstract
Toll-like receptors (TLRs) represent first line of host defence against microbes. Amongst different TLRs, TLR22 is exclusively expressed in non-mammalian vertebrates, including fish. The precise role of TLR22 in fish-immunity remains abstruse. Herein, we used headkidney macrophages (HKM) from Clarias gariepinus and deciphered its role in fish-immunity. Highest tlr22 expression was observed in the immunocompetent organ - headkidney; nonetheless expression in other tissues suggests its possible involvement in non-immune sites also. Aeromonas hydrophila infection up-regulates tlr22 expression in HKM. Our RNAi based study suggested TLR22 restricts intracellular survival of A. hydrophila. Inhibitor and RNAi studies further implicated TLR22 induces pro-inflammatory cytokines TNF-α and IL-1β. We observed heightened caspase-1 activity and our results suggest the role of TLR22 in activating TNF-α/caspase-1/IL-1β cascade leading to caspase-3 mediated apoptosis of A. hydrophila-infected HKM. We conclude, TLR22 plays critical role in immune-surveillance and triggers pro-inflammatory cytokines leading to caspase mediated HKM apoptosis and pathogen clearance.
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11
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Riquelme SA, Prince A. Airway immunometabolites fuel Pseudomonas aeruginosa infection. Respir Res 2020; 21:326. [PMID: 33302964 PMCID: PMC7731785 DOI: 10.1186/s12931-020-01591-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 11/30/2020] [Indexed: 02/07/2023] Open
Abstract
Pulmonary infections are associated with a brisk inflammatory reaction to bacterial surface components. Lipopolysaccharides (LPS) trigger macrophage activation and release of mitochondrial metabolites that control the intensity of the immune response. Whereas succinate induces oxidative stress (ROS), HIF1α stabilization, glycolysis and IL-1β release, itaconate suppresses inflammation by inhibiting succinate oxidation, glycolytic flux and promoting anti-oxidant Nrf2-HO-1 functions. P. aeruginosa is a major pathogen associated with acute and chronic lung infection. Although both secreted toxins, LPS and proteases are key factors to establish acute P. aeruginosa pneumonia, lack of these components in chronic P. aeruginosa isolates suggest these organisms exploit other mechanisms to adapt and persist in the lung. Upon inhalation, P. aeruginosa strains trigger airway macrophage reprograming and bacterial variants obtained from acutely and chronically infected subjects exhibit metabolic adaptation consistent with succinate and itaconate assimilation; namely, high expression of extracellular polysaccharides (EPS), reduced lptD-LPS function, increased glyoxylate shunt (GS) activity and substantial biofilm production. In this review we discuss recent findings illustrating how P. aeruginosa induces and adapts to macrophage metabolites in the human lung, and that catabolism of succinate and itaconate contribute to their formidable abilities to tolerate oxidative stress, phagocytosis and immune clearance.
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Affiliation(s)
| | - Alice Prince
- Department of Pediatrics, Columbia University, New York, NY, 10032, USA.
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12
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Bouillot S, Pont S, Gallet B, Moriscot C, Deruelle V, Attrée I, Huber P. Inflammasome activation by Pseudomonas aeruginosa's ExlA pore-forming toxin is detrimental for the host. Cell Microbiol 2020; 22:e13251. [PMID: 32779854 DOI: 10.1111/cmi.13251] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 07/24/2020] [Accepted: 07/30/2020] [Indexed: 02/06/2023]
Abstract
During acute Pseudomonas aeruginosa infection, the inflammatory response is essential for bacterial clearance. Neutrophil recruitment can be initiated following the assembly of an inflammasome within sentinel macrophages, leading to activation of caspase-1, which in turn triggers macrophage pyroptosis and IL-1β/IL-18 maturation. Inflammasome formation can be induced by a number of bacterial determinants, including Type III secretion systems (T3SSs) or pore-forming toxins, or, alternatively, by lipopolysaccharide (LPS) via caspase-11 activation. Surprisingly, previous studies indicated that a T3SS-induced inflammasome increased pathogenicity in mouse models of P. aeruginosa infection. Here, we investigated the immune reaction of mice infected with a T3SS-negative P. aeruginosa strain (IHMA879472). Virulence of this strain relies on ExlA, a secreted pore-forming toxin. IHMA879472 promoted massive neutrophil infiltration in infected lungs, owing to efficient priming of toll-like receptors, and thus enhanced the expression of inflammatory proteins including pro-IL-1β and TNF-α. However, mature-IL-1β and IL-18 were undetectable in wild-type mice, suggesting that ExlA failed to effectively activate caspase-1. Nevertheless, caspase-1/11 deficiency improved survival following infection with IHMA879472, as previously described for T3SS+ bacteria. We conclude that the detrimental effect associated with the ExlA-induced inflammasome is probably not due to hyperinflammation, rather it stems from another inflammasome-dependent process.
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Affiliation(s)
- Stéphanie Bouillot
- Unité de Biologie Cellulaire et Infection, CEA, INSERM, CNRS, Université Grenoble-Alpes, Grenoble, France
| | - Stéphane Pont
- Unité de Biologie Cellulaire et Infection, CEA, INSERM, CNRS, Université Grenoble-Alpes, Grenoble, France
| | - Benoit Gallet
- Institut de Biologie Structurale, CEA, CNRS, Université Grenoble-Alpes, Grenoble, France
| | - Christine Moriscot
- Institut de Biologie Structurale, CEA, CNRS, Université Grenoble-Alpes, Grenoble, France
| | - Vincent Deruelle
- Unité de Biologie Cellulaire et Infection, CEA, INSERM, CNRS, Université Grenoble-Alpes, Grenoble, France
| | - Ina Attrée
- Unité de Biologie Cellulaire et Infection, CEA, INSERM, CNRS, Université Grenoble-Alpes, Grenoble, France
| | - Philippe Huber
- Unité de Biologie Cellulaire et Infection, CEA, INSERM, CNRS, Université Grenoble-Alpes, Grenoble, France
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13
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Sun J, LaRock DL, Skowronski EA, Kimmey JM, Olson J, Jiang Z, O'Donoghue AJ, Nizet V, LaRock CN. The Pseudomonas aeruginosa protease LasB directly activates IL-1β. EBioMedicine 2020; 60:102984. [PMID: 32979835 PMCID: PMC7511813 DOI: 10.1016/j.ebiom.2020.102984] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 08/17/2020] [Accepted: 08/18/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Pulmonary damage by Pseudomonas aeruginosa during cystic fibrosis lung infection and ventilator-associated pneumonia is mediated both by pathogen virulence factors and host inflammation. Impaired immune function due to tissue damage and inflammation, coupled with pathogen multidrug resistance, complicates the management of these deep-seated infections. Pathological inflammation during infection is driven by interleukin-1β (IL-1β), but the molecular processes involved are not fully understood. METHODS We examined IL-1β activation in a pulmonary model infection of Pseudomonas aeruginosa and in vitro using genetics, specific inhibitors, recombinant proteins, and targeted reporters of protease activity and IL-1β bioactivity. FINDINGS Caspase-family inflammasome proteases canonically regulate maturation of this proinflammatory cytokine, but we report that plasticity in IL-1β proteolytic activation allows for its direct maturation by the pseudomonal protease LasB. LasB promotes IL-1β activation, neutrophilic inflammation, and destruction of lung architecture characteristic of severe P. aeruginosa pulmonary infection. INTERPRETATION Preservation of lung function and effective immune clearance may be enhanced by selectively controlling inflammation. Discovery of this IL-1β regulatory mechanism provides a distinct target for anti-inflammatory therapeutics, such as matrix metalloprotease inhibitors that inhibit LasB and limit inflammation and pathology during P. aeruginosa pulmonary infections. FUNDING Full details are provided in the Acknowledgements section.
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Affiliation(s)
- Josh Sun
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA, United States
| | - Doris L LaRock
- Department of Microbiology and Immunology, Emory School of Medicine, Atlanta GA, United States
| | - Elaine A Skowronski
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA, United States
| | | | - Joshua Olson
- Department of Pediatrics, UC San Diego, La Jolla, CA, United States
| | - Zhenze Jiang
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA, United States
| | - Anthony J O'Donoghue
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA, United States
| | - Victor Nizet
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA, United States; Department of Pediatrics, UC San Diego, La Jolla, CA, United States
| | - Christopher N LaRock
- Department of Microbiology and Immunology, Emory School of Medicine, Atlanta GA, United States; Division of Infectious Diseases, Emory School of Medicine, Atlanta GA, United States; Antimicrobial Resistance Center, Emory University, Atlanta GA, United States.
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14
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Wu Z, Tian Y, Alam HB, Li P, Duan X, Williams AM, Liu B, Ma J, Li Y. Peptidylarginine Deiminases 2 Mediates Caspase-1-Associated Lethality in Pseudomonas aeruginosa Pneumonia-Induced Sepsis. J Infect Dis 2020; 223:1093-1102. [PMID: 32729925 DOI: 10.1093/infdis/jiaa475] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 07/24/2020] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Pseudomonas aeruginosa (PA) is a pathogenic bacterium that causes severe pneumonia in critically ill and immunocompromised patients. Peptidylarginine deiminase (PAD) 2, PAD4, and caspase-1 are important enzymes in mediating host response to infection. The goal of this study was to determine the interplay between PAD2, PAD4, and caspase-1 in PA pneumonia-induced sepsis. METHODS Pneumonia was produced in wild-type, Pad2-/-, and Pad4-/- mice by intranasal inoculation of PA (2.5 × 106 colony-forming units per mouse), and survival (n = 15/group) was monitored for 10 days. Bone marrow-derived macrophages (BMDMs) were isolated for in vitro studies. Samples were collected at specific timepoints for Western blot, bacterial load determination, and flow cytometry analysis. RESULTS Caspase-1-dependent inflammation was diminished in PA-inoculated Pad2-/- mice, contributing to reduced macrophage death and enhanced bacterial clearance. In addition, Pad2-/- mice exhibited improved survival and attenuated acute lung injury after PA infection. In contrast, Pad4-/- mice did not display diminished caspase-1 activation, altered bacterial loads, or improved survival. CONCLUSIONS Peptidylarginine deiminase 2 plays an essential role in the pathogenesis of pulmonary sepsis by mediating caspase-1 activation. This goes against previous findings of PAD4 in sepsis. Our study suggests that PAD2 is a potential therapeutic target of PA pneumonia-induced sepsis.
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Affiliation(s)
- Zhenyu Wu
- Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan, USA.,Department of Infectious Diseases, Xiangya 2nd Hospital, Changsha, Hunan, China
| | - Yuzi Tian
- Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan, USA.,Department of Rheumatoid Diseases, Xiangya Hospital, Changsha, Hunan, China
| | - Hasan B Alam
- Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan, USA
| | - Patrick Li
- Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan, USA
| | - Xiuzhen Duan
- Department of Pathology, Loyola University Medical Center, Maywood, Illinois, USA
| | - Aaron M Williams
- Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan, USA
| | - Baoling Liu
- Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan, USA
| | - Jianjie Ma
- Department of Surgery, Division of Cardiac Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Yongqing Li
- Department of Surgery, University of Michigan Hospital, Ann Arbor, Michigan, USA
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15
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Riquelme SA, Lozano C, Moustafa AM, Liimatta K, Tomlinson KL, Britto C, Khanal S, Gill SK, Narechania A, Azcona-Gutiérrez JM, DiMango E, Saénz Y, Planet P, Prince A. CFTR-PTEN-dependent mitochondrial metabolic dysfunction promotes Pseudomonas aeruginosa airway infection. Sci Transl Med 2020; 11:11/499/eaav4634. [PMID: 31270271 DOI: 10.1126/scitranslmed.aav4634] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 02/12/2019] [Accepted: 06/12/2019] [Indexed: 12/12/2022]
Abstract
Phosphatase and tensin homolog deleted on chromosome 10 (PTEN) is a tumor suppressor best known for regulating cell proliferation and metabolism. PTEN forms a complex with the cystic fibrosis (CF) transmembrane conductance regulator (CFTR) at the plasma membrane, and this complex is known to be functionally impaired in CF. Here, we demonstrated that the combined effect of PTEN and CFTR dysfunction stimulates mitochondrial activity, resulting in excessive release of succinate and reactive oxygen species. This environment promoted the colonization of the airway by Pseudomonas aeruginosa, bacteria that preferentially metabolize succinate, and stimulated an anti-inflammatory host response dominated by immune-responsive gene 1 (IRG1) and itaconate. The recruitment of myeloid cells induced by these strains was inefficient in clearing the infection and increased numbers of phagocytes accumulated under CFTR-PTEN axis dysfunction. This central metabolic defect in mitochondrial function due to impaired PTEN activity contributes to P. aeruginosa infection in CF.
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Affiliation(s)
| | - Carmen Lozano
- Area de Microbiología Molecular, Centro de Investigación Biomédica de la Rioja (CIBIR), Microbiología Molecular, Logroño, LG 26006, Spain
| | - Ahmed M Moustafa
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania and Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Kalle Liimatta
- Department of Pediatrics, Columbia University, New York, NY 10032, USA
| | - Kira L Tomlinson
- Department of Pediatrics, Columbia University, New York, NY 10032, USA
| | - Clemente Britto
- Section of Pulmonary, Critical Care, and Sleep Medicine, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Sara Khanal
- Section of Pulmonary, Critical Care, and Sleep Medicine, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Simren K Gill
- Department of Pediatrics, Columbia University, New York, NY 10032, USA
| | | | - Jose M Azcona-Gutiérrez
- Departamento de Diagnóstico Biomédico. Laboratorio de Microbiología, Hospital San Pedro, Logroño, LG 26006, Spain
| | - Emily DiMango
- Department of Medicine, Columbia University, New York, NY 10032, USA
| | - Yolanda Saénz
- Area de Microbiología Molecular, Centro de Investigación Biomédica de la Rioja (CIBIR), Microbiología Molecular, Logroño, LG 26006, Spain
| | - Paul Planet
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania and Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Alice Prince
- Department of Pediatrics, Columbia University, New York, NY 10032, USA.
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16
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McElvaney OJ, Zaslona Z, Becker-Flegler K, Palsson-McDermott EM, Boland F, Gunaratnam C, Gulbins E, O'Neill LA, Reeves EP, McElvaney NG. Specific Inhibition of the NLRP3 Inflammasome as an Antiinflammatory Strategy in Cystic Fibrosis. Am J Respir Crit Care Med 2020; 200:1381-1391. [PMID: 31454256 DOI: 10.1164/rccm.201905-1013oc] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Rationale: Cystic fibrosis (CF) pulmonary disease is characterized by chronic infection with Pseudomonas aeruginosa and sustained neutrophil-dominant inflammation. The lack of effective antiinflammatory therapies for people with CF (PWCF) represents a significant challenge.Objectives: To identify altered immunometabolism in the CF neutrophil and investigate the feasibility of specific inhibition of the NLRP3 (NOD-, LRR-, and pyrin domain-containing protein 3) inflammasome as a CF antiinflammatory strategy in vivo.Methods: Key markers of increased aerobic glycolysis, known as a Warburg effect, including cytosolic PKM2 (pyruvate kinase M2), phosphorylated PKM2, succinate, HIF-1α (hypoxia-inducible factor-1α), lactate, and the IL-1β precursor pro-IL-1β, as well as caspase-1 activity and processing of pro-IL-1β to IL-1β by the NLRP3 inflammasome, were measured in neutrophils from blood and airway secretions from healthy control subjects (n = 12), PWCF (n = 16), and PWCF after double-lung transplantation (n = 6). The effects of specific inhibition of NLRP3 on airway inflammation and bacterial clearance in a murine CF model were subsequently assessed in vivo.Measurements and Main Results: CF neutrophils display increased aerobic glycolysis in the systemic circulation. This effect is driven by low-level endotoxemia, unaffected by CFTR (cystic fibrosis transmembrane conductance regulator) modulation, and resolves after transplant. The increased pro-IL-1β produced is processed to its mature active form in the LPS-rich CF lung by the NLRP3 inflammasome via caspase-1. Specific NLRP3 inhibition in vivo with MCC950 inhibited IL-1β in the lungs of CF mice (P < 0.0001), resulting in significantly reduced airway inflammation and improved Pseudomonas clearance (P < 0.0001).Conclusions: CF neutrophil immunometabolism is altered in response to inflammation. NLRP3 inflammasome inhibition may have an antiinflammatory and anti-infective role in CF.
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Affiliation(s)
- Oliver J McElvaney
- Irish Centre for Genetic Lung Disease, Department of Medicine, and.,Cystic Fibrosis Unit, Beaumont Hospital, Dublin, Ireland
| | - Zbigniew Zaslona
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland; and
| | | | - Eva M Palsson-McDermott
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland; and
| | - Fiona Boland
- Division of Biostatistics and Population Health Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | | | - Erich Gulbins
- Department of Molecular Biology, University Duisburg-Essen, Essen, Germany
| | - Luke A O'Neill
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland; and
| | - Emer P Reeves
- Irish Centre for Genetic Lung Disease, Department of Medicine, and
| | - Noel G McElvaney
- Irish Centre for Genetic Lung Disease, Department of Medicine, and.,Cystic Fibrosis Unit, Beaumont Hospital, Dublin, Ireland
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17
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Chambers ED, White A, Vang A, Wang Z, Ayala A, Weng T, Blackburn M, Choudhary G, Rounds S, Lu Q. Blockade of equilibrative nucleoside transporter 1/2 protects against Pseudomonas aeruginosa-induced acute lung injury and NLRP3 inflammasome activation. FASEB J 2020; 34:1516-1531. [PMID: 31914698 PMCID: PMC7045807 DOI: 10.1096/fj.201902286r] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/13/2019] [Accepted: 11/14/2019] [Indexed: 11/11/2022]
Abstract
Pseudomonas aeruginosa infections are increasingly multidrug resistant and cause healthcare-associated pneumonia, a major risk factor for acute lung injury (ALI)/acute respiratory distress syndrome (ARDS). Adenosine is a signaling nucleoside with potential opposing effects; adenosine can either protect against acute lung injury via adenosine receptors or cause lung injury via adenosine receptors or equilibrative nucleoside transporter (ENT)-dependent intracellular adenosine uptake. We hypothesized that blockade of intracellular adenosine uptake by inhibition of ENT1/2 would increase adenosine receptor signaling and protect against P. aeruginosa-induced acute lung injury. We observed that P. aeruginosa (strain: PA103) infection induced acute lung injury in C57BL/6 mice in a dose- and time-dependent manner. Using ENT1/2 pharmacological inhibitor, nitrobenzylthioinosine (NBTI), and ENT1-null mice, we demonstrated that ENT blockade elevated lung adenosine levels and significantly attenuated P. aeruginosa-induced acute lung injury, as assessed by lung wet-to-dry weight ratio, BAL protein levels, BAL inflammatory cell counts, pro-inflammatory cytokines, and pulmonary function (total lung volume, static lung compliance, tissue damping, and tissue elastance). Using both agonists and antagonists directed against adenosine receptors A2AR and A2BR, we further demonstrated that ENT1/2 blockade protected against P. aeruginosa -induced acute lung injury via activation of A2AR and A2BR. Additionally, ENT1/2 chemical inhibition and ENT1 knockout prevented P. aeruginosa-induced lung NLRP3 inflammasome activation. Finally, inhibition of inflammasome prevented P. aeruginosa-induced acute lung injury. Our results suggest that targeting ENT1/2 and NLRP3 inflammasome may be novel strategies for prevention and treatment of P. aeruginosa-induced pneumonia and subsequent ARDS.
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Affiliation(s)
- Eboni D. Chambers
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Alpert Medical School of Brown University, Providence, RI 02908
| | - Alexis White
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Alpert Medical School of Brown University, Providence, RI 02908
| | - Alexander Vang
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Alpert Medical School of Brown University, Providence, RI 02908
| | - Zhengke Wang
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Alpert Medical School of Brown University, Providence, RI 02908
| | - Alfred Ayala
- Division of Surgical Research, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI 02908
| | - Tingting Weng
- Departments of Biochemistry and Molecular Biology, University of Texas-Houston Medical School, Houston, TX 77030
| | - Michael Blackburn
- Departments of Biochemistry and Molecular Biology, University of Texas-Houston Medical School, Houston, TX 77030
| | - Gaurav Choudhary
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Alpert Medical School of Brown University, Providence, RI 02908
| | - Sharon Rounds
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Alpert Medical School of Brown University, Providence, RI 02908
| | - Qing Lu
- Vascular Research Laboratory, Providence Veterans Affairs Medical Center, Alpert Medical School of Brown University, Providence, RI 02908
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18
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Chen S, Ma X, Wu D, Yang D, Zhang Y, Liu Q. Scophthalmus maximus interleukin-1β limits Edwardsiella piscicida colonization in vivo. FISH & SHELLFISH IMMUNOLOGY 2019; 95:277-286. [PMID: 31669781 DOI: 10.1016/j.fsi.2019.10.050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 10/15/2019] [Accepted: 10/24/2019] [Indexed: 06/10/2023]
Abstract
Interleukine-1β (IL-1β) is the first identified pro-inflammatory cytokine, which is cleaved by caspase-1 following the inflammasomes activation, playing critical roles in innate immunity. However, few studies have been performed to characterize the IL-1β in lower vertebrates. Herein, we distinguished the Scophthalmus maximus IL-1β (SmIL-1β) from three IL-1β like sequences and found that SmIL-1β was cleaved by S. maximus caspase at a non-conserved Asp86, then targeted to the plasma membrane. Moreover, during the immersion infection of Edwardsiella piscicida, we found that E. piscicida were mainly colonized in gills at early time points and invaded to systemic sites after 5 days post infection, which was consistent with the dynamic up-regulated transcription of SmIL-1β. Furthermore, knockdown of SmIL-1β promotes the bacterial colonization in gills at early time points and result into systemic colonization, while overexpression of SmIL-1β hampers the bacterial colonization in both spleen and kidney. Taken together, these data provide new insights into the molecular mechanisms of SmIL-1β and reveal its role in limiting bacterial infection in vivo, which will support the idea for better understanding the evolutionary of IL-1β functions in teleost.
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Affiliation(s)
- Shouwen Chen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Xin Ma
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Di Wu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Dahai Yang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Marine Cultured Animal Vaccines, Shanghai, 200237, China
| | - Yuanxing Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Marine Cultured Animal Vaccines, Shanghai, 200237, China
| | - Qin Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Marine Cultured Animal Vaccines, Shanghai, 200237, China.
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19
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Ceramide Domains in Health and Disease: A Biophysical Perspective. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1159:79-108. [DOI: 10.1007/978-3-030-21162-2_6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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20
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Keitsch S, Riethmüller J, Soddemann M, Sehl C, Wilker B, Edwards MJ, Caldwell CC, Fraunholz M, Gulbins E, Becker KA. Pulmonary infection of cystic fibrosis mice with Staphylococcus aureus requires expression of α-toxin. Biol Chem 2019; 399:1203-1213. [PMID: 29613852 DOI: 10.1515/hsz-2018-0161] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2018] [Accepted: 03/28/2018] [Indexed: 01/25/2023]
Abstract
Pulmonary infections of cystic fibrosis (CF) patients with Staphylococcus aureus (S. aureus) occur very early in the disease. The molecular details that cause infection-susceptibility of CF patients to and mediate infection with S. aureus are poorly characterized. Therefore, we aimed to identify the role of α-toxin, a major S. aureus toxin, for pulmonary infection of CF mice. Infection with S. aureus JE2 resulted in severe pneumonia in CF mice, while wildtype mice were almost unaffected. Deficiency of α-toxin in JE2-Δhla reduced the pathogenicity of S. aureus in CF mice. However, CF mice were still more susceptible to the mutant S. aureus strain than wildtype mice. The S. aureus JE2 induced a marked increase of ceramide and a downregulation of sphingosine and acid ceramidase expression in bronchi of CF mice. Deletion of α-toxin reduced these changes after infection of CF mice. Similar changes were observed in wildtype mice, but at much lower levels. Our data indicate that expression of α-toxin is a major factor causing S. aureus infections in CF mice. Wildtype S. aureus induces a marked increase of ceramide and a reduction of sphingosine and acid ceramidase expression in bronchial epithelial cells of wildtype and CF mice, changes that determine infection susceptibility.
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Affiliation(s)
- Simone Keitsch
- Department of Molecular Biology, Medical School, University of Duisburg-Essen, Hufelandstrasse 55, D-45122 Essen, Germany
| | - Joachim Riethmüller
- Center for Pediatric Clinical Studies, Children's Clinic, University of Tübingen, Hoppe-Seyler-Str. 1, D-72076 Tübingen, Germany
| | - Matthias Soddemann
- Department of Molecular Biology, Medical School, University of Duisburg-Essen, Hufelandstrasse 55, D-45122 Essen, Germany
| | - Carolin Sehl
- Department of Molecular Biology, Medical School, University of Duisburg-Essen, Hufelandstrasse 55, D-45122 Essen, Germany
| | - Barbara Wilker
- Department of Molecular Biology, Medical School, University of Duisburg-Essen, Hufelandstrasse 55, D-45122 Essen, Germany
| | - Michael J Edwards
- Department of Surgery, University of Cincinnati, College of Medicine, 231 Albert Sabin Way, Cincinnati, OH 45267-0558, USA
| | - Charles C Caldwell
- Department of Surgery, University of Cincinnati, College of Medicine, 231 Albert Sabin Way, Cincinnati, OH 45267-0558, USA
| | - Martin Fraunholz
- Chair of Microbiology, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Erich Gulbins
- Department of Molecular Biology, Medical School, University of Duisburg-Essen, Hufelandstrasse 55, D-45122 Essen, Germany.,Department of Surgery, University of Cincinnati, College of Medicine, 231 Albert Sabin Way, Cincinnati, OH 45267-0558, USA
| | - Katrin Anne Becker
- Department of Molecular Biology, Medical School, University of Duisburg-Essen, Hufelandstrasse 55, D-45122 Essen, Germany
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21
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Crother TR, Porritt RA, Dagvadorj J, Tumurkhuu G, Slepenkin AV, Peterson EM, Chen S, Shimada K, Arditi M. Autophagy Limits Inflammasome During Chlamydia pneumoniae Infection. Front Immunol 2019; 10:754. [PMID: 31031755 PMCID: PMC6473188 DOI: 10.3389/fimmu.2019.00754] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 03/21/2019] [Indexed: 12/23/2022] Open
Abstract
Autophagy can either antagonize or promote intracellular bacterial growth, depending on the pathogen. Here, we investigated the role of autophagy during a pulmonary infection with the obligate intracellular pathogen, Chlamydia pneumoniae (CP). In mouse embryonic fibroblasts (MEFs) or macrophages, deficiency of autophagy pathway components led to enhanced CP replication, suggesting that autophagy exerts a bactericidal role. However, in vivo, mice with myeloid-specific deletion of the autophagic protein ATG16L1 suffered increased mortality during CP infection, neutrophilia, and increased inflammasome activation despite no change in bacterial burden. Induction of autophagy led to reduced CP replication in vitro, but impaired survival in CP-infected mice, associated with an initial reduction in IL-1β production, followed by enhanced neutrophil recruitment, defective CP clearance, and later inflammasome activation and IL-1β production, which drove the resulting mortality. Taken together, our data suggest that a delicate interplay exists between autophagy and inflammasome activation in determining the outcome of CP infection, perturbation of which can result in inflammatory pathology or unrestricted bacterial growth.
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Affiliation(s)
- Timothy R Crother
- Division of Pediatric Infectious Diseases and Immunology, Department of Pediatrics, and Infectious and Immunological Diseases Research Center, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States.,Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Rebecca A Porritt
- Division of Pediatric Infectious Diseases and Immunology, Department of Pediatrics, and Infectious and Immunological Diseases Research Center, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Jargalsaikhan Dagvadorj
- Division of Pediatric Infectious Diseases and Immunology, Department of Pediatrics, and Infectious and Immunological Diseases Research Center, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Gantsetseg Tumurkhuu
- Division of Pediatric Infectious Diseases and Immunology, Department of Pediatrics, and Infectious and Immunological Diseases Research Center, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Anatoly V Slepenkin
- Department of Microbiology and Molecular Genetics, University of California, Irvine, Irvine, CA, United States
| | - Ellena M Peterson
- Department of Pathology, University of California, Irvine, Irvine, CA, United States
| | - Shuang Chen
- Division of Pediatric Infectious Diseases and Immunology, Department of Pediatrics, and Infectious and Immunological Diseases Research Center, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States.,Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Kenichi Shimada
- Division of Pediatric Infectious Diseases and Immunology, Department of Pediatrics, and Infectious and Immunological Diseases Research Center, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States.,Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Moshe Arditi
- Division of Pediatric Infectious Diseases and Immunology, Department of Pediatrics, and Infectious and Immunological Diseases Research Center, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States.,Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
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22
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Bertuzzi M, Hayes GE, Bignell EM. Microbial uptake by the respiratory epithelium: outcomes for host and pathogen. FEMS Microbiol Rev 2019; 43:145-161. [PMID: 30657899 PMCID: PMC6435450 DOI: 10.1093/femsre/fuy045] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 01/17/2019] [Indexed: 12/21/2022] Open
Abstract
Intracellular occupancy of the respiratory epithelium is a useful pathogenic strategy facilitating microbial replication and evasion of professional phagocytes or circulating antimicrobial drugs. A less appreciated but growing body of evidence indicates that the airway epithelium also plays a crucial role in host defence against inhaled pathogens, by promoting ingestion and quelling of microorganisms, processes that become subverted to favour pathogen activities and promote respiratory disease. To achieve a deeper understanding of beneficial and deleterious activities of respiratory epithelia during antimicrobial defence, we have comprehensively surveyed all current knowledge on airway epithelial uptake of bacterial and fungal pathogens. We find that microbial uptake by airway epithelial cells (AECs) is a common feature of respiratory host-microbe interactions whose stepwise execution, and impacts upon the host, vary by pathogen. Amidst the diversity of underlying mechanisms and disease outcomes, we identify four key infection scenarios and use best-characterised host-pathogen interactions as prototypical examples of each. The emergent view is one in which effi-ciency of AEC-mediated pathogen clearance correlates directly with severity of disease outcome, therefore highlighting an important unmet need to broaden our understanding of the antimicrobial properties of respiratory epithelia and associated drivers of pathogen entry and intracellular fate.
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Affiliation(s)
- Margherita Bertuzzi
- Manchester Fungal Infection Group, Faculty of Biology, Medicine and Health. The University of Manchester, Manchester Academic Health Science Centre, Core Technology Facility, Grafton Street, Manchester M13 9NT, UK
- Lydia Becker Institute of Immunology and Inflammation, Biology, Medicine and Health. The University of Manchester, Manchester Academic Health Science Centre
| | - Gemma E Hayes
- Northern Devon Healthcare NHS Trust, North Devon District Hospital, Raleigh Park, Barnstaple EX31 4JB, UK
| | - Elaine M Bignell
- Manchester Fungal Infection Group, Faculty of Biology, Medicine and Health. The University of Manchester, Manchester Academic Health Science Centre, Core Technology Facility, Grafton Street, Manchester M13 9NT, UK
- Lydia Becker Institute of Immunology and Inflammation, Biology, Medicine and Health. The University of Manchester, Manchester Academic Health Science Centre
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23
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Gamma Interferon and Interleukin-17A Differentially Influence the Response of Human Macrophages and Neutrophils to Pseudomonas aeruginosa Infection. Infect Immun 2019; 87:IAI.00814-18. [PMID: 30455194 PMCID: PMC6346128 DOI: 10.1128/iai.00814-18] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 11/07/2018] [Indexed: 12/27/2022] Open
Abstract
Macrophages are important orchestrators of inflammation during bacterial infection, acting as both effector cells and regulators of neutrophil recruitment and life span. Differently activated macrophage populations with distinct inflammatory and microbicidal potentials have been described. Macrophages are important orchestrators of inflammation during bacterial infection, acting as both effector cells and regulators of neutrophil recruitment and life span. Differently activated macrophage populations with distinct inflammatory and microbicidal potentials have been described. Our previous work unveiled a positive and a negative correlation between levels of gamma interferon (IFN-γ) and interleukin-17A (IL-17A), respectively, and lung function in cystic fibrosis, particularly in patients chronically infected with Pseudomonas aeruginosa. This study sought to define key parameters in human antibacterial immunity under Th1- and Th17-dominated inflammatory conditions; the final aim was to identify unique characteristics that could be fine-tuned therapeutically to minimize tissue damage while maximizing bacterial clearance. Toward this aim, neutrophils were incorporated into cultures of macrophages treated with IFN-γ or IL-17A and infected with P. aeruginosa. The intent of this design was to model (i) initiation of inflammation by infected macrophages and (ii) delayed arrival of neutrophils and their exposure to macrophage-derived cytokines. Under these conditions, IFN-γ decreased bacterial killing and promoted the production of monocyte chemoattractant protein 1 (MCP-1). In contrast, IL-17A promoted bacterial killing but did not affect MCP-1 production. The level of secretion of the pyrogen IL-1β was significantly lower in the presence of IFN-γ than in the presence of IL-17A and correlated with levels of the IL1B transcript in infected macrophages. These findings support the validity of this model to investigate human antibacterial immunity. Based on these observations, the protective and damaging roles of IFN-γ and IL-17A, respectively, during P. aeruginosa infection could be caused by their contrasting effects on IL-1β and MCP-1 production.
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24
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Li Bassi G, Prats RG, Artigas A, Xiol EA, Marti JD, Ranzani OT, Rigol M, Fernandez L, Meli A, Battaglini D, Luque N, Ferrer M, Martin-Loeches I, Póvoa P, Chiumello D, Pelosi P, Torres A. Appraisal of systemic inflammation and diagnostic markers in a porcine model of VAP: secondary analysis from a study on novel preventive strategies. Intensive Care Med Exp 2018; 6:42. [PMID: 30343359 PMCID: PMC6195872 DOI: 10.1186/s40635-018-0206-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 09/30/2018] [Indexed: 01/28/2023] Open
Abstract
Background We previously evaluated the efficacy of a ventilatory strategy to achieve expiratory flow bias and positive end-expiratory pressure (EFB + PEEP) or the Trendelenburg position (TP) for the prevention of ventilator-associated pneumonia (VAP). These preventive measures were aimed at improving mucus clearance and reducing pulmonary aspiration of bacteria-laden oropharyngeal secretions. This secondary analysis is aimed at evaluating the effects of aforementioned interventions on systemic inflammation and to substantiate the value of clinical parameters and cytokines in the diagnosis of VAP. Methods Twenty female pigs were randomized to be positioned in the semirecumbent/prone position, and ventilated with duty cycle 0.33 and without PEEP (control); positioned as in the control group, PEEP 5 cmH2O, and duty cycle to achieve expiratory flow bias (EFB+PEEP); ventilated as in the control group, but in the Trendelenburg position (Trendelenburg). Following randomization, P. aeruginosa was instilled into the oropharynx. Systemic cytokines and tracheal secretions P. aeruginosa concentration were quantified every 24h. Lung biopsies were collected for microbiological confirmation of VAP. Results In the control, EFB + PEEP, and Trendelenburg groups, lung tissue Pseudomonas aeruginosa concentration was 2.4 ± 1.5, 1.9 ± 2.1, and 0.3 ± 0.6 log cfu/mL, respectively (p = 0.020). Whereas, it was 2.4 ± 1.9 and 0.6 ± 0.9 log cfu/mL in animals with or without VAP (p < 0.001). Lower levels of interleukin (IL)-1β (p = 0.021), IL-1RA (p < 0.001), IL-4 (p = 0.005), IL-8 (p = 0.008), and IL-18 (p = 0.050) were found in Trendelenburg animals. VAP increased IL-10 (p = 0.035), tumor necrosis factor-α (p = 0.041), and endotracheal aspirate (ETA) P. aeruginosa concentration (p = 0.024). A model comprising ETA bacterial burden, IL-10, and TNF-α yielded moderate discrimination for the diagnosis of VAP (area of the receiver operating curve 0.82, 95% CI 0.61–1.00). Conclusions Our findings demonstrate anti-inflammatory effects associated with the Trendelenburg position. In this reliable model of VAP, ETA culture showed good diagnostic accuracy, whereas systemic IL-10 and TNF-α marginally improved accuracy. Further clinical studies will be necessary to confirm clinical value of the Trendelenburg position as a measure to hinder inflammation during mechanical ventilation and significance of systemic IL-10 and TNF-α in the diagnosis of VAP.
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Affiliation(s)
- Gianluigi Li Bassi
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Centro de Investigación Biomedica En Red- Enfermedades Respiratorias (CIBERES), Barcelona, Spain.,University of Barcelona, Barcelona, Spain
| | - Raquel Guillamat Prats
- Centro de Investigación Biomedica En Red- Enfermedades Respiratorias (CIBERES), Barcelona, Spain.,Pathophysiological Laboratory, Institut de Investigacion Parc Tauli, Corporació Sanitaria Universitaria Parc Tauli, Autonomous University of Barcelona, Sabadell, Barcelona, Spain
| | - Antonio Artigas
- Centro de Investigación Biomedica En Red- Enfermedades Respiratorias (CIBERES), Barcelona, Spain.,Pathophysiological Laboratory, Institut de Investigacion Parc Tauli, Corporació Sanitaria Universitaria Parc Tauli, Autonomous University of Barcelona, Sabadell, Barcelona, Spain
| | - Eli Aguilera Xiol
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Centro de Investigación Biomedica En Red- Enfermedades Respiratorias (CIBERES), Barcelona, Spain
| | - Joan-Daniel Marti
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain
| | - Otavio T Ranzani
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain
| | - Montserrat Rigol
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Cardiology Department, Hospital Clinic, Barcelona, Spain
| | - Laia Fernandez
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Centro de Investigación Biomedica En Red- Enfermedades Respiratorias (CIBERES), Barcelona, Spain.,University of Barcelona, Barcelona, Spain
| | - Andrea Meli
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain.,Dipartimento di Anestesia e Rianimazione, ASST Santi Paolo e Carlo, Dipartimento di Scienza e Salute, Universita degli Studi di Milano, Milan, Italy
| | - Denise Battaglini
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain.,Dipartimento Scienze Chirurgiche e Diagnostiche Integrate (DISC), Università degli Studi di Genova, Genova, Italy
| | - Nestor Luque
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain
| | - Miguel Ferrer
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Centro de Investigación Biomedica En Red- Enfermedades Respiratorias (CIBERES), Barcelona, Spain.,University of Barcelona, Barcelona, Spain
| | - Ignacio Martin-Loeches
- Multidisciplinary Intensive Care Research Organization (MICRO), Department of Clinical Medicine, Trinity Centre for Health Sciences, St James's University Hospital, Dublin, Ireland
| | - Pedro Póvoa
- Polyvalent Intensive Care Unit, São Francisco Xavier Hospital, Centro Hospitalar de Lisboa Ocidental, Lisbon, Portugal.,NOVA Medical School, CEDOC, New University of Lisbon, Lisbon, Portugal
| | - Davide Chiumello
- Dipartimento di Anestesia e Rianimazione, ASST Santi Paolo e Carlo, Dipartimento di Scienza e Salute, Universita degli Studi di Milano, Milan, Italy
| | - Paolo Pelosi
- Dipartimento Scienze Chirurgiche e Diagnostiche Integrate (DISC), Università degli Studi di Genova, Genova, Italy
| | - Antoni Torres
- Division of Animal Experimentation, Department of Pulmonary and Critical Care Medicine, Thorax Institute, Hospital Clinic, Calle Villarroel 170, Esc 6/8 Pl 2, Barcelona, Spain. .,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. .,Centro de Investigación Biomedica En Red- Enfermedades Respiratorias (CIBERES), Barcelona, Spain. .,University of Barcelona, Barcelona, Spain.
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25
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Flaherty RA, Donahue DL, Carothers KE, Ross JN, Ploplis VA, Castellino FJ, Lee SW. Neutralization of Streptolysin S-Dependent and Independent Inflammatory Cytokine IL-1β Activity Reduces Pathology During Early Group A Streptococcal Skin Infection. Front Cell Infect Microbiol 2018; 8:211. [PMID: 30018884 PMCID: PMC6037840 DOI: 10.3389/fcimb.2018.00211] [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] [Received: 12/19/2017] [Accepted: 06/05/2018] [Indexed: 12/12/2022] Open
Abstract
The bacterial pathogen Group A Streptococcus (GAS) has been shown to induce a variety of human diseases ranging in severity from pharyngitis to toxic shock syndrome and necrotizing fasciitis. GAS produces a powerful peptide toxin known as Streptolysin S (SLS). Though long recognized as a potent cytolysin, recent evidence from our lab has shown that SLS-dependent cytotoxicity is mediated through activation of the pro-inflammatory mediators p38 MAPK and NFκB. These findings led us to hypothesize that activation of p38 MAPK and NFκB signaling drive the production of pro-inflammatory cytokines which, in turn, serve as positive feedback signals to initiate cytotoxicity in infected host cells. To address this hypothesis, we utilized a cytokine array to characterize the SLS-dependent pro-inflammatory cytokine response to GAS infection in human keratinocytes. From these studies, IL-1β was found to be markedly upregulated in the presence of SLS, and further investigation revealed that this cytokine contributes to cytotoxicity in human keratinocytes during infection. Subcutaneous infection studies were performed in mice to address the physiological impact of increased IL-1β production. These studies demonstrated that IL-1β is produced during GAS skin infection in an SLS-dependent manner. Furthermore, inhibition of this cytokine and the upstream kinases and other signaling mediators that drive its production reduced SLS-mediated lesion formation early in the infection process. Together, our findings indicate that pharmacological inhibition of this inflammatory axis holds promise as a therapeutic strategy to reduce tissue destruction during severe invasive Group A Streptococcal infections.
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Affiliation(s)
- Rebecca A Flaherty
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States.,Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States
| | - Deborah L Donahue
- W. M. Keck Center for Transgene Research, University of Notre Dame, Notre Dame, IN, United States
| | - Katelyn E Carothers
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States.,Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States
| | - Jessica N Ross
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States.,Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States
| | - Victoria A Ploplis
- W. M. Keck Center for Transgene Research, University of Notre Dame, Notre Dame, IN, United States
| | - Francis J Castellino
- W. M. Keck Center for Transgene Research, University of Notre Dame, Notre Dame, IN, United States
| | - Shaun W Lee
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States.,Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States.,W. M. Keck Center for Transgene Research, University of Notre Dame, Notre Dame, IN, United States
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26
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Hughes AJ, Knoten CA, Morris AR, Hauser AR. ASC acts in a caspase-1-independent manner to worsen acute pneumonia caused by Pseudomonas aeruginosa. J Med Microbiol 2018; 67:1168-1180. [PMID: 29957172 DOI: 10.1099/jmm.0.000782] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
PURPOSE Pseudomonas aeruginosa expresses a type III secretion system (T3SS) that activates the host inflammasome-mediated immune response. We examined the role of inflammasome activation in severe infection outcomes. METHODS We infected C57BL/6 (B6) mice lacking inflammasome components ASC or caspase-1/11 with a highly virulent strain of P. aeruginosa, PSE9, using a mouse model of pneumonia. We evaluated inflammasome activation in vitro by infecting bone marrow-derived macrophages (BMDMs) with PSE9 and measuring cell death and release of inflammasome-dependent cytokines IL-18 and IL-1β. A bioluminescent reporter assay was used to detect activity of caspase-1 and caspase-3/7 in BMDMs from B6 and ASC-deficient mice.Results/Key Findings. ASC-/- mice exhibited significantly improved survival relative to caspase-1/11-/- mice and B6 mice, demonstrating that ASC and caspase-1/11 play differential roles in P. aeruginosa infection. We found that ASC-/- BMDMs exhibited significantly reduced cell death relative to B6 BMDMs, while caspase-1/11-/- BMDMs were resistant to cell death. IL-18 and IL-1β were both detected from supernatants of infected B6 BMDMs, but cytokine release was abrogated in both ASC-/- and caspase-1/11-/- BMDMs. We detected a 2.5-fold increase in the activation of caspase-3/7 in PSE9-infected B6 BMDMs, but no increase in infected ASC-/- BMDMs. Cell death, cytokine release and caspase-3/7 activity were dependent on a functional T3SS. CONCLUSIONS Collectively, these results are consistent with a model whereby the T3SS apparatus of P. aeruginosa activates the caspase-1-dependent inflammasome and caspase-3/7 through an ASC-dependent mechanism. This activation may have implications for the outcomes of P. aeruginosa infections.
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Affiliation(s)
- A J Hughes
- 1Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - C A Knoten
- 1Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,†Present address: Academy for Quality and Safety Improvement, Northwestern Medicine, Chicago, IL, USA
| | - A R Morris
- 1Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - A R Hauser
- 2Department of Medicine, Division of Infectious Diseases, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,1Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
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27
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Qu W, Wang Y, Wu Y, Liu Y, Chen K, Liu X, Zou Z, Huang X, Wu M. Triggering Receptors Expressed on Myeloid Cells 2 Promotes Corneal Resistance Against Pseudomonas aeruginosa by Inhibiting Caspase-1-Dependent Pyroptosis. Front Immunol 2018; 9:1121. [PMID: 29887864 PMCID: PMC5980993 DOI: 10.3389/fimmu.2018.01121] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Accepted: 05/03/2018] [Indexed: 01/16/2023] Open
Abstract
Triggering receptors expressed on myeloid cells 2 (TREM2) is a novel cell surface receptor and functions as an immunomodulatory receptor in infectious diseases. In this study, we investigated the function and regulatory mechanism of TREM2 in Pseudomonas aeruginosa (P. aeruginosa) keratitis. We found that P. aeruginosa keratitis was more severe in Trem2−/− versus wild type C57BL/6 mice as indicated by the increased clinical scores, bacterial load, and cornea pathology. The exacerbated disease progression caused by TREM2 deficiency was associated with boosted activation of caspase-1 and subsequent pyroptosis as well as increased expression of IL-1β. In addition, blockage of pyroptosis by caspase-1 inhibitor not only recovered the severe cornea pathology developed in Trem2−/− mice but also restored the P. aeruginosa clearance suppressed by TREM2 deficiency. Our study demonstrated that TREM2 promotes host resistance against P. aeruginosa keratitis by inhibiting caspase-1-dependent pyroptosis, which provides new insights of TREM2-mediated anti-bacterial immunity.
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Affiliation(s)
- Wenting Qu
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China.,Key Laboratory of Tropical Diseases Control, Ministry of Education, Sun Yat-sen University, Guangzhou, China
| | - Yi Wang
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China.,Key Laboratory of Tropical Diseases Control, Ministry of Education, Sun Yat-sen University, Guangzhou, China
| | - Yongjian Wu
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China.,Key Laboratory of Tropical Diseases Control, Ministry of Education, Sun Yat-sen University, Guangzhou, China
| | - Yiting Liu
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China.,Key Laboratory of Tropical Diseases Control, Ministry of Education, Sun Yat-sen University, Guangzhou, China
| | - Kang Chen
- Department of Laboratory Medicine, Zhongshan Hospital of Sun Yat-sen University, Zhongshan, China
| | - Xi Liu
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China
| | - Zhengyu Zou
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China.,Key Laboratory of Tropical Diseases Control, Ministry of Education, Sun Yat-sen University, Guangzhou, China
| | - Xi Huang
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China.,Key Laboratory of Tropical Diseases Control, Ministry of Education, Sun Yat-sen University, Guangzhou, China
| | - Minhao Wu
- Program of Pathobiology and Immunology, Fifth Affiliated Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangdong, China.,Key Laboratory of Tropical Diseases Control, Ministry of Education, Sun Yat-sen University, Guangzhou, China.,Guangdong Engineering & Technology Research Center for Disease-Model Animals, Sun Yat-sen University, Guangzhou, China
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28
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The Role of Pseudomonas aeruginosa ExoY in an Acute Mouse Lung Infection Model. Toxins (Basel) 2018; 10:toxins10050185. [PMID: 29734720 PMCID: PMC5983241 DOI: 10.3390/toxins10050185] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 04/20/2018] [Accepted: 05/02/2018] [Indexed: 12/31/2022] Open
Abstract
The effector protein Exotoxin Y (ExoY) produced by Pseudomonas aeruginosa is injected via the type III secretion system (T3SS) into host cells. ExoY acts as nucleotidyl cyclase promoting the intracellular accumulation of cyclic nucleotides. To what extent nucleotidyl cyclase activity contributes to the pathogenicity of ExoY and which mechanisms participate in the manifestation of lung infection is still unclear. Here, we used an acute airway infection model in mice to address the role of ExoY in lung infection. In infected lungs, a dose-dependent phenotype of infection with bacteria-expressing ExoY was mirrored by haemorrhage, formation of interstitial oedema in alveolar septa, and infiltration of the perivascular space with erythrocytes and neutrophilic granulocytes. Analyses of the infection process on the cellular and organismal level comparing infections with Pseudomonas aeruginosa mutants expressing either nucleotidyl cyclase-active or -inactive ExoY revealed differential cytokine secretion, increased prevalence of apoptosis, and a break of lung barrier integrity in mice infected with cyclase-active ExoY. Notably, of all measured cyclic nucleotides, only the increase of cyclic UMP in infected mouse lungs coincides temporally with the observed early pathologic changes. In summary, our results suggest that the nucleotidyl cyclase activity of ExoY can contribute to P. aeruginosa acute pathogenicity.
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29
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Riquelme SA, Ahn D, Prince A. Pseudomonas aeruginosa and Klebsiella pneumoniae Adaptation to Innate Immune Clearance Mechanisms in the Lung. J Innate Immun 2018; 10:442-454. [PMID: 29617698 PMCID: PMC6785651 DOI: 10.1159/000487515] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 02/08/2018] [Accepted: 02/08/2018] [Indexed: 01/02/2023] Open
Abstract
Many different species of gram-negative bacteria are associated with infection in the lung, causing exacerbations of chronic obstructive pulmonary disease, cystic fibrosis (CF), and ventilator-associated pneumonias. These airway pathogens must adapt to common host clearance mechanisms that include killing by antimicrobial peptides, antibiotics, oxidative stress, and phagocytosis by leukocytes. Bacterial adaptation to the host is often evident phenotypically, with increased extracellular polysaccharide production characteristic of some biofilm-associated organisms. Given the relatively limited repertoire of bacterial strategies to elude airway defenses, it seems likely that organisms sharing the same ecological niche might also share common strategies to persistently infect the lung. In this review, we will highlight some of the major factors responsible for the adaptation of Pseudomonas aeruginosa to the lung, addressing how growth in biofilms enables persistent infection, relevant to, but not limited to, the pathogenesis of infection in CF. In contrast, we will discuss how carbapenem-resistant Klebsiella pneumoniae evade immune clearance, an organism often associated with ventilator-associated pneumonia and health-care-acquired pneumonias, but not a typical pathogen in CF.
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Affiliation(s)
| | | | - Alice Prince
- Department of Pediatrics, Columbia University Medical Center, New York, New York, USA
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30
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Aoyagi T, Newstead MW, Zeng X, Nanjo Y, Peters-Golden M, Kaku M, Standiford TJ. Interleukin-36γ and IL-36 receptor signaling mediate impaired host immunity and lung injury in cytotoxic Pseudomonas aeruginosa pulmonary infection: Role of prostaglandin E2. PLoS Pathog 2017; 13:e1006737. [PMID: 29166668 PMCID: PMC5718565 DOI: 10.1371/journal.ppat.1006737] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Revised: 12/06/2017] [Accepted: 11/07/2017] [Indexed: 12/21/2022] Open
Abstract
Pseudomonas aeruginosa is a Gram-negative pathogen that can lead to severe infection associated with lung injury and high mortality. The interleukin (IL)-36 cytokines (IL-36α, IL-36β and IL-36γ) are newly described IL-1 like family cytokines that promote inflammatory response via binding to the IL-36 receptor (IL-36R). Here we investigated the functional role of IL-36 cytokines in the modulating of innate immune response against P. aeruginosa pulmonary infection. The intratracheal administration of flagellated cytotoxic P. aeruginosa (ATCC 19660) upregulated IL-36α and IL-36γ, but not IL-36β, in the lungs. IL-36α and IL-36γ were expressed in pulmonary macrophages (PMs) and alveolar epithelial cells in response to P. aeruginosa in vitro. Mortality after bacterial challenge in IL-36 receptor deficient (IL-36R-/-) mice and IL-36γ deficient (IL-36γ-/-) mice, but not IL-36α deficient mice, was significantly lower than that of wild type mice. Decreased mortality in IL-36R-/- mice and IL-36γ-/- mice was associated with reduction in bacterial burden in the alveolar space, bacterial dissemination, production of inflammatory cytokines and lung injury, without changes in lung leukocyte influx. Interestingly, IL-36γ enhanced the production of prostaglandin E2 (PGE2) during P. aeruginosa infection in vivo and in vitro. Treatment of PMs with recombinant IL-36γ resulted in impaired bacterial killing via PGE2 and its receptor; EP2. P. aeruginosa infected EP2 deficient mice or WT mice treated with a COX-2-specific inhibitor showed decreased bacterial burden and dissemination, but no change in lung injury. Finally, we observed an increase in IL-36γ, but not IL-36α, in the airspace and plasma of patients with P. aeruginosa-induced acute respiratory distress syndrome. Thus, IL-36γ and its receptor signal not only impaired bacterial clearance in a possible PGE2 dependent fashion but also mediated lung injury during P. aeruginosa infection.
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Affiliation(s)
- Tetsuji Aoyagi
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
- Department of Infection Control and Laboratory Diagnostics, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- * E-mail:
| | - Michael W. Newstead
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Xianying Zeng
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Yuta Nanjo
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
- Department of Microbiology and Infectious Diseases, Toho University School of Medicine, Tokyo, Japan
| | - Marc Peters-Golden
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Mitsuo Kaku
- Department of Infection Control and Laboratory Diagnostics, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Theodore J. Standiford
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, United States of America
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31
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Cytosolic Phospholipase A 2α Promotes Pulmonary Inflammation and Systemic Disease during Streptococcus pneumoniae Infection. Infect Immun 2017; 85:IAI.00280-17. [PMID: 28808157 DOI: 10.1128/iai.00280-17] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/02/2017] [Indexed: 02/07/2023] Open
Abstract
Pulmonary infection by Streptococcus pneumoniae is characterized by a robust alveolar infiltration of neutrophils (polymorphonuclear cells [PMNs]) that can promote systemic spread of the infection if not resolved. We previously showed that 12-lipoxygenase (12-LOX), which is required to generate the PMN chemoattractant hepoxilin A3 (HXA3) from arachidonic acid (AA), promotes acute pulmonary inflammation and systemic infection after lung challenge with S. pneumoniae As phospholipase A2 (PLA2) promotes the release of AA, we investigated the role of PLA2 in local and systemic disease during S. pneumoniae infection. The group IVA cytosolic isoform of PLA2 (cPLA2α) was activated upon S. pneumoniae infection of cultured lung epithelial cells and was critical for AA release from membrane phospholipids. Pharmacological inhibition of this enzyme blocked S. pneumoniae-induced PMN transepithelial migration in vitro Genetic ablation of the cPLA2 isoform cPLA2α dramatically reduced lung inflammation in mice upon high-dose pulmonary challenge with S. pneumoniae The cPLA2α-deficient mice also suffered no bacteremia and survived a pulmonary challenge that was lethal to wild-type mice. Our data suggest that cPLA2α plays a crucial role in eliciting pulmonary inflammation during pneumococcal infection and is required for lethal systemic infection following S. pneumoniae lung challenge.
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32
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Torres IM, Patankar YR, Berwin B. Acidosis exacerbates in vivo IL-1-dependent inflammatory responses and neutrophil recruitment during pulmonary Pseudomonas aeruginosa infection. Am J Physiol Lung Cell Mol Physiol 2017; 314:L225-L235. [PMID: 28982735 DOI: 10.1152/ajplung.00338.2017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Acidic microenvironments commonly occur at sites of inflammation and bacterial infections. In the context of a Pseudomonas aeruginosa infection, we previously demonstrated that acidosis enhances the cellular proinflammatory interleukin (IL)-1β response in vitro. However, how pH alterations affect in vivo IL-1β responses and subsequent IL-1-driven inflammation during infection with P. aeruginosa is unclear. Here, we report that acidosis enhances in vivo IL-1β production and downstream IL-1 receptor-dependent responses during infection with P. aeruginosa in models of acute pneumonia and peritonitis. Importantly, we demonstrate that infection with P. aeruginosa within an acidic environment leads to enhanced production of a subset of proinflammatory cytokines, including chemokine (C-X-C) motif ligand 1, IL-6, and chemokine (C-C motif) ligand 2, and increased neutrophil recruitment. Furthermore, with the use of IL-1 receptor type 1-deficient mice, we identify the contribution of the IL-1 signaling pathway to the acidosis-enhanced inflammatory response and pathology. These data provide insights into the potential benefit of pH regulation during bacterial infections to control disease progression and immunopathology.
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Affiliation(s)
- Iviana M Torres
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
| | - Yash R Patankar
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
| | - Brent Berwin
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
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33
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Jeon J, Kim YJ, Shin H, Ha UH. T3SS effector ExoY reduces inflammasome-related responses by suppressing bacterial motility and delaying activation of NF-κB and caspase-1. FEBS J 2017; 284:3392-3403. [PMID: 28815941 DOI: 10.1111/febs.14199] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Revised: 07/05/2017] [Accepted: 08/11/2017] [Indexed: 11/28/2022]
Abstract
Type III-secreted effectors are essential for modulating host immune responses during the pathogenesis of Pseudomonas aeruginosa infections. Little is known about the impact of one of the effectors, ExoY, on inflammasome activation, which results in IL-1β production and pyroptotic cell death. In this study, we found that transcriptional expression of Il-1β was induced to a lesser extent in response to an exoY-harboring strain than to a deleted mutant. This suppressive effect of ExoY was verified by complementation assay as well as by direct translocation of exoY into host cells. In addition to the production of IL-1β, pyroptotic cell death was also diminished in response to an exoY-harboring strain. These inflammasome responses were mediated by the adenylate cyclase activity of ExoY, which plays a role in delaying the activation of NF-κB and caspase-1, a key component of inflammasome-mediated responses. Moreover, the negative effects of ExoY on these responses were in part conferred by the suppression of bacterial motility, which could reduce the degree of bacterial contact with cells. Together, these results demonstrate that the adenylate cyclase activity of P. aeruginosa ExoY can reduce inflammasome-related responses by influencing both the host and the bacterium itself by delaying the activation of inflammatory pathways and suppressing bacterial motility.
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Affiliation(s)
- Jisu Jeon
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, Korea
| | - Yong-Jae Kim
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, Korea
| | - Heesung Shin
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, Korea
| | - Un-Hwan Ha
- Department of Biotechnology and Bioinformatics, Korea University, Sejong, Korea
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34
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Basso P, Wallet P, Elsen S, Soleilhac E, Henry T, Faudry E, Attrée I. Multiple Pseudomonas species secrete exolysin-like toxins and provoke Caspase-1-dependent macrophage death. Environ Microbiol 2017; 19:4045-4064. [PMID: 28654176 DOI: 10.1111/1462-2920.13841] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 06/02/2017] [Accepted: 06/19/2017] [Indexed: 12/19/2022]
Abstract
Pathogenic bacteria secrete protein toxins that provoke apoptosis or necrosis of eukaryotic cells. Here, we developed a live-imaging method, based on incorporation of a DNA-intercalating dye into membrane-damaged host cells, to study the kinetics of primary bone marrow-derived macrophages (BMDMs) mortality induced by opportunistic pathogen Pseudomonas aeruginosa expressing either Type III Secretion System (T3SS) toxins or the pore-forming toxin, Exolysin (ExlA). We found that ExlA promotes the activation of Caspase-1 and maturation of interleukin-1β. BMDMs deficient for Caspase-1 and Caspase-11 were resistant to ExlA-induced death. Furthermore, by using KO BMDMs, we determined that the upstream NLRP3/ASC complex leads to the Caspase-1 activation. We also demonstrated that Pseudomonas putida and Pseudomonas protegens and the Drosophila pathogen Pseudomonas entomophila, which naturally express ExlA-like toxins, are cytotoxic toward macrophages and provoke the same type of pro-inflammatory death as does ExlA+ P. aeruginosa. These results demonstrate that ExlA-like toxins of two-partner secretion systems from diverse Pseudomonas species activate the NLRP3 inflammasome and provoke inflammatory pyroptotic death of macrophages.
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Affiliation(s)
- Pauline Basso
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
| | - Pierre Wallet
- CIRI, Centre International de Recherche en Infectiologie, INSERM, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Univ Lyon, Lyon, F-69007, France
| | - Sylvie Elsen
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
| | - Emmanuelle Soleilhac
- CMBA Platform, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, CEA, INSERM; Genetics & Chemogenomics, France
| | - Thomas Henry
- CIRI, Centre International de Recherche en Infectiologie, INSERM, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, École Normale Supérieure de Lyon, Univ Lyon, Lyon, F-69007, France
| | - Eric Faudry
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
| | - Ina Attrée
- CNRS-ERL5261, INSERM, U1036, CEA, Bacterial Pathogenesis and Cellular Responses, Biosciences and Biotechnology Institute of Grenoble, University Grenoble Alpes, France
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35
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Staphylococcus aureus Survives in Cystic Fibrosis Macrophages, Forming a Reservoir for Chronic Pneumonia. Infect Immun 2017; 85:IAI.00883-16. [PMID: 28289144 DOI: 10.1128/iai.00883-16] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Accepted: 03/03/2017] [Indexed: 12/16/2022] Open
Abstract
Staphylococcus aureus plays an important role in sepsis, pneumonia, wound infections, and cystic fibrosis (CF), which is caused by mutations of the cystic fibrosis transmembrane conductance regulator (Cftr). Pulmonary S. aureus infections in CF often occur very early and prior to colonization with other pathogens, in particular Pseudomonas aeruginosa Here, we demonstrate that CF mice are highly susceptible to pulmonary infections with S. aureus and fail to clear the pathogen during infection. S. aureus is internalized by Cftr-deficient macrophages in the lung, but these macrophages are unable to kill intracellular bacteria. This failure might be caused by a defect in the fusion of phagosomes with lysosomes, while this process occurs rapidly in wild-type macrophages and serves to kill intracellular pathogens. Transplantation of infected Cftr-deficient alveolar macrophages into the lungs of noninfected CF mice is sufficient to induce pneumonia. This suggests that intracellular survival of S. aureus in macrophages may allow the pathogen to chronically infect CF lungs.
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36
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Abstract
Urinary tract infections (UTIs) cause a huge burden of morbidity worldwide with recurrent UTIs becoming increasingly frequent owing to the emergence of antibiotic-resistant bacterial strains. Interactions between the innate and adaptive immune responses to pathogens colonizing the urinary tract have been the focus of much research. Inflammasomes are part of the innate immune defence and can respond rapidly to infectious insult. Assembly of the multiprotein inflammasome complex activates caspase-1, processes proinflammatory cytokines IL-1β and IL-18, and induces pyroptosis. These effector pathways, in turn, act at different levels to either prevent or resolve infection, or eliminate the infectious agent itself. In certain instances, inflammasome activation promotes tissue pathology; however, the precise functions of inflammasomes in UTIs remain unexplored. An improved understanding of inflammasomes could provide novel approaches for the design of diagnostics and therapeutics for complicated UTIs, enabling us to overcome the challenge of drug resistance.
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37
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Pu Q, Gan C, Li R, Li Y, Tan S, Li X, Wei Y, Lan L, Deng X, Liang H, Ma F, Wu M. Atg7 Deficiency Intensifies Inflammasome Activation and Pyroptosis in Pseudomonas Sepsis. THE JOURNAL OF IMMUNOLOGY 2017; 198:3205-3213. [PMID: 28258192 DOI: 10.4049/jimmunol.1601196] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 02/09/2017] [Indexed: 02/05/2023]
Abstract
Sepsis is a severe and complicated syndrome that is characterized by dysregulation of host inflammatory responses and organ failure, with high morbidity and mortality. The literature implies that autophagy is a crucial regulator of inflammation in sepsis. In this article, we report that autophagy-related protein 7 (Atg7) is involved in inflammasome activation in Pseudomonas aeruginosa abdominal infection. Following i.p. challenge with P. aeruginosa, atg7fl/fl mice showed impaired pathogen clearance, decreased survival, and widespread dissemination of bacteria into the blood and lung tissue compared with wild-type mice. The septic atg7fl/fl mice also exhibited elevated neutrophil infiltration and severe lung injury. Loss of Atg7 resulted in increased production of IL-1β and pyroptosis, consistent with enhanced inflammasome activation. Furthermore, we demonstrated that P. aeruginosa flagellin is a chief trigger of inflammasome activation in the sepsis model. Collectively, our results provide insight into innate immunity and inflammasome activation in sepsis.
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Affiliation(s)
- Qinqin Pu
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, People's Republic of China.,Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Changpei Gan
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, People's Republic of China.,Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Rongpeng Li
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203.,Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
| | - Yi Li
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, People's Republic of China.,Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Shirui Tan
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Xuefeng Li
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, People's Republic of China.,Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Yuquan Wei
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, People's Republic of China
| | - Lefu Lan
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Pudong Xinqu, Shanghai Shi 201203, People's Republic of China
| | - Xin Deng
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon Tong, Hong Kong
| | - Haihua Liang
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, Xi'an, ShangXi 710069, People's Republic of China; and
| | - Feng Ma
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences and Peking Union Medical College, Chengdu, Sichuan 610052, People's Republic of China
| | - Min Wu
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, People's Republic of China; .,Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
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38
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Lin CK, Kazmierczak BI. Inflammation: A Double-Edged Sword in the Response to Pseudomonas aeruginosa Infection. J Innate Immun 2017; 9:250-261. [PMID: 28222444 DOI: 10.1159/000455857] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 01/05/2017] [Indexed: 12/22/2022] Open
Abstract
The Gram-negative opportunistic pathogen Pseudomonas aeruginosa exploits failures of barrier defense and innate immunity to cause acute infections at a range of anatomic sites. We review the defense mechanisms that normally protect against P. aeruginosa pulmonary infection, as well as the bacterial products and activities that trigger their activation. Innate immune recognition of P. aeruginosa is critical for pathogen clearance; nonetheless, inflammation is also associated with pathogen persistence and poor host outcomes. We describe P. aeruginosa adaptations that improve this pathogen's fitness in the inflamed airway, and briefly discuss strategies to manipulate inflammation to benefit the host. Such adjunct therapies may become increasingly important in the treatment of acute and chronic infections caused by this multi-drug-resistant pathogen.
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39
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Bioactivity-based UPLC/Q-TOF/MS strategy for screening of anti-inflammatory components from Cimicifugae Rhizoma. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2016.11.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Mayer-Barber KD, Yan B. Clash of the Cytokine Titans: counter-regulation of interleukin-1 and type I interferon-mediated inflammatory responses. Cell Mol Immunol 2017; 14:22-35. [PMID: 27264686 PMCID: PMC5214938 DOI: 10.1038/cmi.2016.25] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 04/25/2016] [Accepted: 04/26/2016] [Indexed: 02/07/2023] Open
Abstract
Over the past decades the notion of 'inflammation' has been extended beyond the original hallmarks of rubor (redness), calor (heat), tumor (swelling) and dolor (pain) described by Celsus. We have gained a more detailed understanding of the cellular players and molecular mediators of inflammation which is now being applied and extended to areas of biomedical research such as cancer, obesity, heart disease, metabolism, auto-inflammatory disorders, autoimmunity and infectious diseases. Innate cytokines are often central components of inflammatory responses. Here, we discuss how the type I interferon and interleukin-1 cytokine pathways represent distinct and specialized categories of inflammatory responses and how these key mediators of inflammation counter-regulate each other.
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Affiliation(s)
- Katrin D Mayer-Barber
- Inflammation and Innate Immunity Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Bo Yan
- Inflammation and Innate Immunity Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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41
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van den Boogaard FE, Hofstra JJ, Brands X, Levi MM, Roelofs JJTH, Zaat SAJ, Van't Veer C, van der Poll T, Schultz MJ. Nebulized Recombinant Human Tissue Factor Pathway Inhibitor Attenuates Coagulation and Exerts Modest Anti-inflammatory Effects in Rat Models of Lung Injury. J Aerosol Med Pulm Drug Deliv 2016; 30:91-99. [PMID: 27977318 DOI: 10.1089/jamp.2016.1317] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Critically ill patients are at a constant risk of direct (e.g., by pneumonia) or indirect lung injury (e.g., by sepsis). Excessive alveolar fibrin deposition is a prominent feature of lung injury, undermining pulmonary integrity and function. METHODS We examined the effect of local administration of recombinant human tissue factor pathway inhibitor (rh-TFPI), a natural anticoagulant, in two well-established models of lung injury in rats. Rats received intratracheal instillation of Pseudomonas aeruginosa, causing direct lung injury, or they received an intravenous injection of Escherichia coli lipopolysaccharide (LPS), causing indirect lung injury. Rats were randomized to local treatment with rh-TFPI or placebo through repeated nebulization. RESULTS Challenge with P. aeruginosa or LPS was associated with increased coagulation and decreased fibrinolysis in bronchoalveolar lavage fluid (BALF) and plasma. Rh-TFPI levels in BALF increased after nebulization, whereas plasma rh-TFPI levels remained low and systemic TFPI activity was not affected. Nebulization of rh-TFPI attenuated pulmonary and systemic coagulation in both models, without affecting fibrinolysis. Nebulization of rh-TFPI modestly reduced the inflammatory response and bacterial growth of P. aeruginosa in the alveolar compartment. CONCLUSIONS Local treatment with rh-TFPI does not alter systemic TFPI activity; however, it attenuates both pulmonary and systemic coagulopathy. Furthermore, nebulized rh-TFPI modestly reduces the pulmonary inflammatory response and allows increased bacterial clearance in rats with direct lung injury caused by P. aeruginosa.
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Affiliation(s)
- Florry E van den Boogaard
- 1 Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,2 Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,3 Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands
| | - Jorrit J Hofstra
- 1 Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,4 Department of Medical Microbiology, University of Amsterdam , Amsterdam, The Netherlands
| | - Xanthe Brands
- 1 Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,2 Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands
| | - Marcel M Levi
- 5 Department of Internal Medicine, University of Amsterdam , Amsterdam, The Netherlands
| | - Joris J T H Roelofs
- 6 Department of Pathology, University of Amsterdam , Amsterdam, The Netherlands
| | - Sebastiaan A J Zaat
- 3 Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,4 Department of Medical Microbiology, University of Amsterdam , Amsterdam, The Netherlands
| | - Cornelis Van't Veer
- 2 Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,3 Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands
| | - Tom van der Poll
- 2 Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,3 Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,7 Department of Infectious Diseases, University of Amsterdam , Amsterdam, The Netherlands
| | - Marcus J Schultz
- 1 Laboratory of Experimental Intensive Care and Anesthesiology (L·E·I·C·A), Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands .,8 Department of Intensive Care Medicine, Academic Medical Center, University of Amsterdam , Amsterdam, The Netherlands
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42
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Wolf L, Sapich S, Honecker A, Jungnickel C, Seiler F, Bischoff M, Wonnenberg B, Herr C, Schneider-Daum N, Lehr CM, Bals R, Beisswenger C. IL-17A-mediated expression of epithelial IL-17C promotes inflammation during acute Pseudomonas aeruginosa pneumonia. Am J Physiol Lung Cell Mol Physiol 2016; 311:L1015-L1022. [PMID: 27694471 DOI: 10.1152/ajplung.00158.2016] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 09/26/2016] [Indexed: 12/31/2022] Open
Abstract
Lung epithelial cells are suggested to promote pathogen-induced pulmonary inflammation by the release of chemokines, resulting in enhanced recruitment of circulating leukocytes. Recent studies have shown that the interleukin-17C (IL-17C) regulates innate immune functions of epithelial cells in an autocrine manner. The aim of this study was to investigate the contribution of IL-17C to pulmonary inflammation in a mouse model of acute Pseudomonas aeruginosa pneumonia. Infection with P. aeruginosa resulted in an increased expression of IL-17C in lung tissue of wild-type mice. Numbers of neutrophils and the expression of the neutrophil-recruiting chemokines keratinocyte-derived chemokine and macrophage inflammatory protein 2 were significantly decreased in lungs of IL-17C-deficient (IL-17C-/-) mice infected with P. aeruginosa at 24 h. Systemic concentrations of interleukin-6 (IL-6) were significantly decreased in infected IL-17C-/- mice at 24 h and the survival of IL-17C-/- mice was significantly increased at 48 h. The expression of IL-17C was reduced in infected mice deficient for interleukin-17A (IL-17A), whereas pulmonary concentrations of IL-17A were not affected by the deficiency for IL-17C. Stimulation of primary alveolar epithelial cells with IL-17A resulted in a significantly increased expression of IL-17C in vitro. Our data suggest that IL-17A-mediated expression of epithelial IL-17C amplifies the release of chemokines by epithelial cells and thereby contributes to the recruitment of neutrophils and systemic inflammation during acute P. aeruginosa pneumonia.
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Affiliation(s)
- Lisa Wolf
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - Sandra Sapich
- Department of Drug Delivery, Helmholtz Institute for Pharmaceutical Research Saarland, Saarbrücken, Germany; and
| | - Anja Honecker
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - Christopher Jungnickel
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - Frederik Seiler
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - Markus Bischoff
- Institute of Medical Microbiology and Hygiene, Saarland University, Homburg, Germany
| | - Bodo Wonnenberg
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - Christian Herr
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - Nicole Schneider-Daum
- Department of Drug Delivery, Helmholtz Institute for Pharmaceutical Research Saarland, Saarbrücken, Germany; and
| | - Claus-Michael Lehr
- Department of Drug Delivery, Helmholtz Institute for Pharmaceutical Research Saarland, Saarbrücken, Germany; and.,Biopharmaceutics and Pharmaceutical Technology, Department of Pharmacy, Saarland University, Saarbrücken, Germany
| | - Robert Bals
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - Christoph Beisswenger
- Department of Internal Medicine V-Pulmonology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany;
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43
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Wonnenberg B, Jungnickel C, Honecker A, Wolf L, Voss M, Bischoff M, Tschernig T, Herr C, Bals R, Beisswenger C. IL-17A attracts inflammatory cells in murine lung infection with P. aeruginosa. Innate Immun 2016; 22:620-625. [DOI: 10.1177/1753425916668244] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
IL-17A-dependent immunity is of importance in the protection against extracellular bacterial pathogens. However, IL-17A is also suggested to mediate the pathogenesis of lung diseases, such as acute respiratory distress syndrome. Here, we studied the role of IL-17A in a mouse model of acute pneumonia. IL-17A mediated the expression of keratinocyte-derived chemokine (KC) and the recruitment of inflammatory cells in mice infected with a sub-lethal dose of Pseudomonas aeruginosa. IL-17A deficiency protected mice from lethal P. aeruginosa lung infection. A sub-lethal infection with Streptococcus pneumoniae resulted in increased bacterial burden associated with increased pulmonary inflammation. Thus, the type of infectious bacteria seemed to influence the way in which IL-17A functions during pulmonary infection. Reducing pulmonary inflammation by targeting IL-17A may be a therapeutic option in acute P. aeruginosa pneumonia.
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Affiliation(s)
| | - Christopher Jungnickel
- Department of Internal Medicine V – Pulmonology, Allergology and Respiratory Critical Care Medicine, Germany
| | - Anja Honecker
- Department of Internal Medicine V – Pulmonology, Allergology and Respiratory Critical Care Medicine, Germany
| | - Lisa Wolf
- Department of Internal Medicine V – Pulmonology, Allergology and Respiratory Critical Care Medicine, Germany
| | - Meike Voss
- Department of Internal Medicine V – Pulmonology, Allergology and Respiratory Critical Care Medicine, Germany
| | - Markus Bischoff
- Institute of Medical Microbiology and Hygiene Saarland University, Germany
| | | | - Christian Herr
- Department of Internal Medicine V – Pulmonology, Allergology and Respiratory Critical Care Medicine, Germany
| | - Robert Bals
- Department of Internal Medicine V – Pulmonology, Allergology and Respiratory Critical Care Medicine, Germany
| | - Christoph Beisswenger
- Department of Internal Medicine V – Pulmonology, Allergology and Respiratory Critical Care Medicine, Germany
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44
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Rice TC, Seitz AP, Edwards MJ, Gulbins E, Caldwell CC. Frontline Science: Sphingosine rescues burn-injured mice from pulmonary Pseudomonas aeruginosa infection. J Leukoc Biol 2016; 100:1233-1237. [PMID: 27418352 DOI: 10.1189/jlb.3hi0416-197r] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 06/12/2016] [Accepted: 06/21/2016] [Indexed: 11/24/2022] Open
Abstract
Burn patients with concomitant pulmonary Pseudomonas aeruginosa (PA) infection have mortality rates as high as 50%, despite antibiotic therapy. Sphingosine is generated from ceramide via ceramidase and has been reported to have antimicrobial properties. We observed a reduction in sphingosine and a concurrent increase in ceramide in bronchial epithelial cells after burn injury. After PA inoculation, these mice had a significant decrease in survival compared to noninjured mice. However, when injured mice were pretreated with sphingosine or neutral ceramidase and subsequently infected, mortality and bacterial levels were robustly reduced. We further observed that sphingosine directly kills PA. Together, these results demonstrate that reduction in sphingosine is associated with an increased susceptibility to pulmonary infection after burn injury. Restoration of sphingosine levels through direct sphingosine administration or conversion of the increased ceramide to sphingosine by neutral ceramidase reduces mortality and mitigates pulmonary infection after burn injury.
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Affiliation(s)
- Teresa C Rice
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Aaron P Seitz
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Michael J Edwards
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Erich Gulbins
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio.,Department of Molecular Biology, University of Essen, Essen, Germany; and.,Department of Research, Shriners Hospitals for Children, Cincinnati, Ohio
| | - Charles C Caldwell
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio; .,Department of Research, Shriners Hospitals for Children, Cincinnati, Ohio
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45
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Anantharajah A, Faure E, Buyck JM, Sundin C, Lindmark T, Mecsas J, Yahr TL, Tulkens PM, Mingeot-Leclercq MP, Guery B, Van Bambeke F. Inhibition of the Injectisome and Flagellar Type III Secretion Systems by INP1855 Impairs Pseudomonas aeruginosa Pathogenicity and Inflammasome Activation. J Infect Dis 2016; 214:1105-16. [PMID: 27412581 DOI: 10.1093/infdis/jiw295] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 07/06/2016] [Indexed: 11/13/2022] Open
Abstract
With the rise of multidrug resistance, Pseudomonas aeruginosa infections require alternative therapeutics. The injectisome (iT3SS) and flagellar (fT3SS) type III secretion systems are 2 virulence factors associated with poor clinical outcomes. iT3SS translocates toxins, rod, needle, or regulator proteins, and flagellin into the host cell cytoplasm and causes cytotoxicity and NLRC4-dependent inflammasome activation, which induces interleukin 1β (IL-1β) release and reduces interleukin 17 (IL-17) production and bacterial clearance. fT3SS ensures bacterial motility, attachment to the host cells, and triggers inflammation. INP1855 is an iT3SS inhibitor identified by in vitro screening, using Yersinia pseudotuberculosis Using a mouse model of P. aeruginosa pulmonary infection, we show that INP1855 improves survival after infection with an iT3SS-positive strain, reduces bacterial pathogenicity and dissemination and IL-1β secretion, and increases IL-17 secretion. INP1855 also modified the cytokine balance in mice infected with an iT3SS-negative, fT3SS-positive strain. In vitro, INP1855 impaired iT3SS and fT3SS functionality, as evidenced by a reduction in secretory activity and flagellar motility and an increase in adenosine triphosphate levels. As a result, INP1855 decreased cytotoxicity mediated by toxins and by inflammasome activation induced by both laboratory strains and clinical isolates. We conclude that INP1855 acts by dual inhibition of iT3SS and fT3SS and represents a promising therapeutic approach.
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Affiliation(s)
- Ahalieyah Anantharajah
- Pharmacologie cellulaire et moléculaire, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Emmanuel Faure
- EA7366, Host-Pathogen Translational Research Group, Faculté de Médecine, Université Lille Nord de France, Lille, France
| | - Julien M Buyck
- Pharmacologie cellulaire et moléculaire, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | | | | | - Joan Mecsas
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts
| | - Timothy L Yahr
- Department of Microbiology, University of Iowa, Iowa City
| | - Paul M Tulkens
- Pharmacologie cellulaire et moléculaire, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Marie-Paule Mingeot-Leclercq
- Pharmacologie cellulaire et moléculaire, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Benoît Guery
- EA7366, Host-Pathogen Translational Research Group, Faculté de Médecine, Université Lille Nord de France, Lille, France
| | - Françoise Van Bambeke
- Pharmacologie cellulaire et moléculaire, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
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46
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Wonnenberg B, Bischoff M, Beisswenger C, Dinh T, Bals R, Singh B, Tschernig T. The role of IL-1β in Pseudomonas aeruginosa in lung infection. Cell Tissue Res 2016; 364:225-9. [PMID: 26984603 DOI: 10.1007/s00441-016-2387-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 02/25/2016] [Indexed: 12/19/2022]
Abstract
This mini-review examines the role of the pro-inflammatory cytokine interleukin (IL)-1β in the interaction of Pseudomonas aeruginosa and the host immune system during lung infection. Different studies show that the reduction of the inflammatory response, especially a decrease in IL-1β, leads to a better outcome in acute lung infection with this bacterium. This includes a higher survival rate, reduced damage to the lung tissue and, in particular, a better clearance of the airways and the tissue of the lungs from P. aeruginosa.
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Affiliation(s)
- B Wonnenberg
- Department of Anatomy and Cell Biology, Saarland University, Kirrberger Strasse, 66424, Homburg, Saar, Germany
| | - M Bischoff
- Institute of Medical Microbiology and Hygiene, Saarland University, Homburg, Germany
| | - C Beisswenger
- Department of Internal Medicine V, Pneumology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - T Dinh
- Department of Experimental Pneumology and Allergology, Saarland University, Homburg, Germany
| | - R Bals
- Department of Internal Medicine V, Pneumology, Allergology and Respiratory Critical Care Medicine, Saarland University, Homburg, Germany
| | - B Singh
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada
| | - T Tschernig
- Department of Anatomy and Cell Biology, Saarland University, Kirrberger Strasse, 66424, Homburg, Saar, Germany.
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47
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Hommes TJ, Dessing MC, Veer CV', Florquin S, Colonna M, de Vos AF, van der Poll T. Role of triggering receptor expressed on myeloid cells-1/3 in Klebsiella-derived pneumosepsis. Am J Respir Cell Mol Biol 2016; 53:647-55. [PMID: 25860078 DOI: 10.1165/rcmb.2014-0485oc] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Triggering receptor expressed on myeloid cells (TREM)-1 and -2 can affect Toll-like receptor-mediated activation of immune cells. Klebsiella pneumoniae is a common cause of pneumonia-derived sepsis. Here we studied the role of TREM-1/3 and TREM-2 in the host response during Klebsiella pneumonia. Macrophages lacking either TREM-1/3 or TREM-2 were tested for their responsiveness toward K. pneumoniae and for their capacity to internalize this pathogen in vitro. TREM-1/3- and TREM-2-deficient mice were infected with K. pneumoniae via the airways, and their responses were compared with those in wild-type mice. TREM-1/3-deficient macrophages produced lower cytokine levels upon exposure to K. pneumoniae, whereas TREM-2-deficient macrophages released higher cytokine concentrations. TREM-2-deficient, but not TREM-1/3-deficient, macrophages showed a reduced capacity to phagocytose K. pneumoniae. TREM-1/3-deficient mice showed an impaired host defense during Klebsiella pneumonia, as reflected by worsened survival and increased bacterial growth and dissemination. In contrast, TREM-2 deficiency did not affect disease outcome. Although TREM-1/3 and TREM-2 influence macrophage responsiveness to K. pneumoniae in vitro, only TREM-1/3 contribute to the host response during Klebsiella pneumonia in vivo, serving a protective role.
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Affiliation(s)
- Tijmen J Hommes
- 1 Center for Experimental and Molecular Medicine.,2 Center for Infection and Immunity
| | | | - Cornelis van 't Veer
- 1 Center for Experimental and Molecular Medicine.,2 Center for Infection and Immunity
| | | | - Marco Colonna
- 4 Department of Pathology, Washington University in St. Louis, St. Louis, Missouri
| | - Alex F de Vos
- 1 Center for Experimental and Molecular Medicine.,2 Center for Infection and Immunity
| | - Tom van der Poll
- 1 Center for Experimental and Molecular Medicine.,2 Center for Infection and Immunity.,5 Division of Infectious Diseases, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands; and
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48
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Deng Q, Wang Y, Zhang Y, Li M, Li D, Huang X, Wu Y, Pu J, Wu M. Pseudomonas aeruginosa Triggers Macrophage Autophagy To Escape Intracellular Killing by Activation of the NLRP3 Inflammasome. Infect Immun 2016; 84:56-66. [PMID: 26467446 PMCID: PMC4694000 DOI: 10.1128/iai.00945-15] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 10/12/2015] [Indexed: 02/07/2023] Open
Abstract
Assembly of the inflammasome has recently been identified to be a critical event in the initiation of inflammation. However, its role in bacterial killing remains unclear. Our study demonstrates that Pseudomonas aeruginosa infection induces the assembly of the NLRP3 inflammasome and the sequential secretion of caspase1 and interleukin-1β (IL-1β) in human macrophages. More importantly, activation of the NLRP3 inflammasome reduces the killing of P. aeruginosa in human macrophages, without affecting the generation of antimicrobial peptides, reactive oxygen species, and nitric oxide. In addition, our results demonstrate that P. aeruginosa infection increases the amount of the LC3-II protein and triggers the formation of autophagosomes in human macrophages. The P. aeruginosa-induced autophagy was enhanced by overexpression of NLRP3, ASC, or caspase1 but was reduced by knockdown of these core molecules of the NLRP3 inflammasome. Treatment with IL-1β enhanced autophagy in human macrophages. More importantly, IL-1β decreased the macrophage-mediated killing of P. aeruginosa, whereas knockdown of ATG7 or Beclin1 restored the IL-1β-mediated suppression of bacterial killing. Collectively, our study explores a novel mechanism employed by P. aeruginosa to escape from phagocyte killing and may provide a better understanding of the interaction between P. aeruginosa and host immune cells, including macrophages.
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Affiliation(s)
- Qiuchan Deng
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Yi Wang
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Yuanqing Zhang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Meiyu Li
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Dandan Li
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Xi Huang
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Yongjian Wu
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Jieying Pu
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Minhao Wu
- Department of Immunology, Zhongshan School of Medicine, Institute of Human Virology, Institute of Tuberculosis Control, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
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49
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Gonçalves-de-Albuquerque CF, Silva AR, Burth P, Rocco PRM, Castro-Faria MV, Castro-Faria-Neto HC. Possible mechanisms of Pseudomonas aeruginosa-associated lung disease. Int J Med Microbiol 2015; 306:20-8. [PMID: 26652129 DOI: 10.1016/j.ijmm.2015.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 11/11/2015] [Accepted: 11/14/2015] [Indexed: 12/22/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic bacterium causing lung injury in immunocompromised patients correlated with high morbidity and mortality. Many bacteria, including P. aeruginosa, use extracellular signals to synchronize group behaviors, a process known as quorum sensing (QS). In the P. aeruginosa complex QS system controls expression of over 300 genes, including many involved in host colonization and disease. P. aeruginosa infection elicits a complex immune response due to a large number of immunogenic factors present in the bacteria or released during infection. Here, we focused on the mechanisms by which P. aeruginosa triggers lung injury and inflammation, debating the possible ways that P. aeruginosa evades the host immune system, which leads to immune suppression and resistance.
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Affiliation(s)
| | - Adriana Ribeiro Silva
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Patrícia Burth
- Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil
| | - Patricia Rieken Macêdo Rocco
- Laboratório de Investigação Pulmonar, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Mauro Velho Castro-Faria
- Laboratório Integrado de Nefrologia, Departamento de Medicina Interna, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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50
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Pathophysiological changes induced by Pseudomonas aeruginosa infection are involved in MMP-12 and MMP-13 upregulation in human carcinoma epithelial cells and a pneumonia mouse model. Infect Immun 2015; 83:4791-9. [PMID: 26438797 PMCID: PMC4645383 DOI: 10.1128/iai.00619-15] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 09/18/2015] [Indexed: 12/20/2022] Open
Abstract
Pseudomonas aeruginosa infections persist in patients with cystic fibrosis (CF) and drive lung disease progression. P. aeruginosa potently activates the innate immune system mostly through the recognition of pathogen-associated molecular patterns, such as flagellin. Matrix metalloproteinases 12 and 13 (MMP-12 and MMP-13, respectively) exacerbate chronic lung infection and inflammation by promoting uncontrolled tissue rearrangements and fibrosis, yet the underlying molecular mechanisms by which this occurs remain largely unknown. In this study, we used quantitative bacteriology, histological examination, and proinflammatory cytokine levels to evaluate the effects of MMP-12 and MMP-13 on P. aeruginosa strain K-induced infection and pneumonia in H292 epithelial cells and mice, respectively. Under inflammatory stimulation, mRNA and protein expression levels of proinflammatory mediators were higher in strain K-infected mice and cells than in uninfected counterparts, in which MMP-12 and MMP-13 expression reached levels similar to those observed in epithelial cells. Moreover, we also found that the NF-κB pathway might be involved in the induction of cytokines in response to strain K infection. Taken together, these data suggest that MMP-12 and MMP-13 alter strain K infection in mice and play a role in inflammatory regulation by modulating cytokine levels.
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