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Li ZH, Wang Y, Yu XY. Exploring the role of pyroptosis and immune infiltration in sepsis based on bioinformatic analysis. Immunobiology 2024; 229:152826. [PMID: 38981197 DOI: 10.1016/j.imbio.2024.152826] [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: 01/16/2024] [Revised: 05/20/2024] [Accepted: 06/09/2024] [Indexed: 07/11/2024]
Abstract
PURPOSE Sepsis is a disease that is typically treated in intensive care units with high mortality and morbidity. Pyroptosis is a newly identified type of programmed cell death and is characterized by inflammatory cytokine secretion. However, the role of pyroptosis in sepsis remains unclear. METHODS GSE28750 and GSE134347 datasets were obtained from the Gene Expression Omnibus (GEO) database. Differentially expressed pyroptosis genes (DEPGs) were identified between sepsis and healthy controls. Machine learning was used to further narrow the gene range. Receiver operating curves (ROC) were generated to estimate the diagnostic efficacy. Immune infiltration levels were estimated via single-sample gene set enrichment analysis (ssGSEA). A network database was used to predict the upstream transcription factors and miRNAs of DEPGs. Finally, the expression of the genes was validated by qRT-PCR between sepsis patients and healthy controls. RESULTS We found that the pyroptosis pathway was enriched and activated in sepsis. 8 DEPGs were identified. A heatmap showed that the genes, NLRC4, NAIP, IL-18, AIM2 and ELANE, were abundant in the sepsis samples, and the genes, NLRP1, CHMP7 and TP53, were abundant in the healthy control samples. The ssGSEA results showed that the abundances of activated dendritic cells, MDSC, macrophage, plasmacytoid dendritic cells, regulatory T-cells, and Th17-cells were significantly higher, while the activated B-cell, activated CD8 T-cell, CD56 dim tural killer cell, immature B-cell, monocyte, and T follicular helper cell abundances were lower in sepsis samples compared to healthy controls. The qRT-PCR results showed that the expression levels of NAIP, IL-18, TP53, CHMP7, NLRC4, ELANE and NLRP1 were consistant with the bioinformatic analyses, while the expression level of AIM2 has no significant difference. CONCLUSION Our study identified seven potential pyroptosis-related genes, NAIP, IL-18, TP53, CHMP7, NLRC4, ELANE and NLRP1. This study revealed that pyroptosis may promote sepsis development by activating the immune response.
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Affiliation(s)
- Zhi-Hua Li
- Department of critical medicine, the First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, China
| | - Yi Wang
- Department of critical medicine, the First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, China
| | - Xiang-You Yu
- Department of critical medicine, the First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, China.
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2
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Zhang J, Brodsky IE, Shin S. Yersinia deploys type III-secreted effectors to evade caspase-4 inflammasome activation in human cells. mBio 2023; 14:e0131023. [PMID: 37615436 PMCID: PMC10653943 DOI: 10.1128/mbio.01310-23] [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: 06/15/2023] [Accepted: 07/06/2023] [Indexed: 08/25/2023] Open
Abstract
IMPORTANCE Yersinia are responsible for significant disease burden in humans, ranging from recurrent disease outbreaks (yersiniosis) to pandemics (Yersinia pestis plague). Together with rising antibiotic resistance rates, there is a critical need to better understand Yersinia pathogenesis and host immune mechanisms, as this information will aid in developing improved immunomodulatory therapeutics. Inflammasome responses in human cells are less studied relative to murine models of infection, though recent studies have uncovered key differences in inflammasome responses between mice and humans. Here, we dissect human intestinal epithelial cell and macrophage inflammasome responses to Yersinia pseudotuberculosis. Our findings provide insight into species- and cell type-specific differences in inflammasome responses to Yersinia.
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Affiliation(s)
- Jenna Zhang
- Department of Microbiology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Igor E. Brodsky
- Department of Pathobiology, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, Pennsylvania, USA
| | - Sunny Shin
- Department of Microbiology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania, USA
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3
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Zhang J, Brodsky IE, Shin S. Yersinia Type III-Secreted Effectors Evade the Caspase-4 Inflammasome in Human Cells. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.24.525473. [PMID: 36747770 PMCID: PMC9900831 DOI: 10.1101/2023.01.24.525473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Yersinia are gram-negative zoonotic bacteria that use a type III secretion system (T3SS) to inject Yersinia outer proteins (Yops) into the host cytosol to subvert essential components of innate immune signaling. However, Yersinia virulence activities can elicit activation of inflammasomes, which lead to inflammatory cell death and cytokine release to contain infection. Yersinia activation and evasion of inflammasomes have been characterized in murine macrophages but remain poorly defined in human cells, particularly intestinal epithelial cells (IECs), a primary site of intestinal Yersinia infection. In contrast to murine macrophages, we find that in both human IECs and macrophages, Yersinia pseudotuberculosis T3SS effectors enable evasion of the caspase-4 inflammasome, which senses cytosolic lipopolysaccharide (LPS). The antiphagocytic YopE and YopH, as well as the translocation regulator YopK, were collectively responsible for evading inflammasome activation, in part by inhibiting Yersinia internalization mediated by YadA and β1-integrin signaling. These data provide insight into the mechanisms of Yersinia-mediated inflammasome activation and evasion in human cells, and reveal species-specific differences underlying regulation of inflammasome responses to Yersinia .
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Affiliation(s)
- Jenna Zhang
- Department of Microbiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104
| | - Igor E. Brodsky
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania 19104
| | - Sunny Shin
- Department of Microbiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104
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4
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Greenwood CS, Wynosky-Dolfi MA, Beal AM, Booty LM. Gasdermins assemble; recent developments in bacteriology and pharmacology. Front Immunol 2023; 14:1173519. [PMID: 37266429 PMCID: PMC10230072 DOI: 10.3389/fimmu.2023.1173519] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 05/02/2023] [Indexed: 06/03/2023] Open
Abstract
The discovery of gasdermin D (GSDMD) as the terminal executioner of pyroptosis provided a large piece of the cell death puzzle, whilst simultaneously and firmly putting the gasdermin family into the limelight. In its purest form, GSDMD provides a connection between the innate alarm systems to an explosive, inflammatory form of cell death to jolt the local environment into immunological action. However, the gasdermin field has moved rapidly and significantly since the original seminal work and novel functions and mechanisms have been recently uncovered, particularly in response to infection. Gasdermins regulate and are regulated by mechanisms such as autophagy, metabolism and NETosis in fighting pathogen and protecting host. Importantly, activators and interactors of the other gasdermins, not just GSDMD, have been recently elucidated and have opened new avenues for gasdermin-based discovery. Key to this is the development of potent and specific tool molecules, so far a challenge for the field. Here we will cover some of these recently discovered areas in relation to bacterial infection before providing an overview of the pharmacological landscape and the challenges associated with targeting gasdermins.
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Affiliation(s)
- Claudine S. Greenwood
- Chemical Biology, GSK, Stevenage, United Kingdom
- Pure and Applied Chemistry, University of Strathclyde, Glasgow, United Kingdom
| | | | - Allison M. Beal
- Immunology Research Unit, GSK, Philadelphia, PA, United States
| | - Lee M. Booty
- Immunology Network, GSK, Stevenage, United Kingdom
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5
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Razumova IY, Surnina ZV, Dzhaber DN. [Current view on the pathogenesis of immune-mediated inflammatory diseases associated with ocular manifestations]. Vestn Oftalmol 2023; 139:68-75. [PMID: 37067934 DOI: 10.17116/oftalma202313902168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
This literature review discusses the new concept of pathogenesis of systemic immune-mediated inflammatory diseases (IMIDs), presents their classification and analyzes their association with ocular manifestations.
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Affiliation(s)
- I Yu Razumova
- Krasnov Research Institute of Eye Diseases, Moscow, Russia
| | - Z V Surnina
- Krasnov Research Institute of Eye Diseases, Moscow, Russia
| | - D N Dzhaber
- Scientific and Practical Sight Recovery Center, Moscow, Russia
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6
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Dietary Polyphenols as Prospective Natural-Compound Depression Treatment from the Perspective of Intestinal Microbiota Regulation. Molecules 2022; 27:molecules27217637. [PMID: 36364464 PMCID: PMC9657699 DOI: 10.3390/molecules27217637] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/04/2022] [Accepted: 11/05/2022] [Indexed: 11/09/2022] Open
Abstract
The broad beneficial effects of dietary polyphenols on human health have been confirmed. Current studies have shown that dietary polyphenols are important for maintaining the homeostasis of the intestinal microenvironment. Moreover, the corresponding metabolites of dietary polyphenols can effectively regulate intestinal micro-ecology and promote human health. Although the pathogenesis of depression has not been fully studied, it has been demonstrated that dysfunction of the microbiota-gut-brain axis may be its main pathological basis. This review discusses the interaction between dietary polyphenols and intestinal microbiota to allow us to better assess the potential preventive effects of dietary polyphenols on depression by modulating the host gut microbiota.
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7
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Tang J, Suo L, Li F, Bian K, Yang C, Wang Y. Transcriptome profiling of lung immune responses potentially related to acute respiratory distress syndrome in forest musk deer. BMC Genomics 2022; 23:701. [PMID: 36221054 PMCID: PMC9552132 DOI: 10.1186/s12864-022-08917-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Accepted: 09/28/2022] [Indexed: 12/04/2022] Open
Abstract
Background Forest musk deer is an endangered species globally. The death of captive forest musk deer can be caused by certain respiratory system diseases. Acute respiratory distress syndrome (ARDS) is a huge threat to the life of forest muck deer that breed in our department. Methods Lung histopathologic analysis was conducted by hematoxylin and eosin (HE) staining. The lung gene changes triggered by ARDS were examined by RNA sequencing and related bioinformatics analysis in forest musk deer. The potential functions of unigenes were investigated by NR, SwissProt KOG, GO, and KEGG annotation analyses. Vital biological processes or pathways in ARDS were examined by GO and KEGG enrichment analyses. Results A total of 3265 unigenes were differentially expressed (|log2fold-change|> 2 and adjusted P value < 0.01) in lung tissues of 3 forest musk deer with ARDS compared with normal lung tissues of the non-ARDS group. These differentially expressed unigenes (DEGs) played crucial roles in immunity and defense responses to pathogens. Moreover, we identified the DEGs related to one or more of the following biological processes: lung development, immunity, and bacterial/viral/fungal infection. And six DEGs that might be involved in lung injury caused by immune dysregulation or viral/fungal infection were identified. Conclusion ARDS-mediated lung gene alterations were identified in forest musk deer. Moreover, multiple genes involved in lung development and lung defense responses to bacteria/viruses/fungi in ARDS were filtered out in forest musk deer. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-022-08917-7.
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Affiliation(s)
- Jie Tang
- Shaanxi Institute of Zoology, Xi'an710032, Shaanxi, China
| | - Lijuan Suo
- Shaanxi Institute of Zoology, Xi'an710032, Shaanxi, China
| | - Feiran Li
- Shaanxi Institute of Zoology, Xi'an710032, Shaanxi, China
| | - Kun Bian
- Shaanxi Institute of Zoology, Xi'an710032, Shaanxi, China
| | - Chao Yang
- Shaanxi Institute of Zoology, Xi'an710032, Shaanxi, China.
| | - Yan Wang
- Shaanxi Institute of Zoology, Xi'an710032, Shaanxi, China.,Shaanxi Provincial Field Observation & Research Station for Golden Monkey, Giant Panda and Biodiversity, Xi'an 723400, Shaanxi, China
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8
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Domingo IK, Latif A, Bhavsar AP. Pro-Inflammatory Signalling PRRopels Cisplatin-Induced Toxicity. Int J Mol Sci 2022; 23:7227. [PMID: 35806229 PMCID: PMC9266867 DOI: 10.3390/ijms23137227] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/26/2022] [Accepted: 06/27/2022] [Indexed: 02/04/2023] Open
Abstract
Cisplatin is a platinum-based chemotherapeutic that has long since been effective against a variety of solid-cancers, substantially improving the five-year survival rates for cancer patients. Its use has also historically been limited by its adverse drug reactions, or cisplatin-induced toxicities (CITs). Of these reactions, cisplatin-induced nephrotoxicity (CIN), cisplatin-induced peripheral neuropathy (CIPN), and cisplatin-induced ototoxicity (CIO) are the three most common of several CITs recognised thus far. While the anti-cancer activity of cisplatin is well understood, the mechanisms driving its toxicities have only begun to be defined. Most of the literature pertains to damage caused by oxidative stress that occurs downstream of cisplatin treatment, but recent evidence suggests that the instigator of CIT development is inflammation. Cisplatin has been shown to induce pro-inflammatory signalling in CIN, CIPN, and CIO, all of which are associated with persisting markers of inflammation, particularly from the innate immune system. This review covered the hallmarks of inflammation common and distinct between different CITs, the role of innate immune components in development of CITs, as well as current treatments targeting pro-inflammatory signalling pathways to conserve the use of cisplatin in chemotherapy and improve long-term health outcomes of cancer patients.
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Affiliation(s)
| | | | - Amit P. Bhavsar
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, AB T6G 2E1, Canada; (I.K.D.); (A.L.)
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9
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Wan P, Zhang S, Ruan Z, Liu X, Yang G, Jia Y, Li Y, Pan P, Wang W, Li G, Chen X, Liu Z, Zhang Q, Luo Z, Wu J. AP-1 signaling pathway promotes pro-IL-1β transcription to facilitate NLRP3 inflammasome activation upon influenza A virus infection. Virulence 2022; 13:502-513. [PMID: 35300578 PMCID: PMC8942419 DOI: 10.1080/21505594.2022.2040188] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
NLRP3 inflammasome mainly controls interleukin-1β (IL-1β) secretion, leading to cell death called pyroptosis constituting a major antiviral host defense and inflammatory diseases upon viral infection. The RAF-MEK1/2-ERK1/2 cascade and downstream c-Jun/Fos and Activator protein-1 (AP1) signaling pathway control the degree of inflammatory response. Influenza A virus (IAV) infection is known to stimulate NLRP3 inflammasome activation and inflammatory responses. Nevertheless, the detailed mechanism by which IAV induces NLRP3 inflammasome activation involved in transcription of pro-IL-1β mRNA remains elusive. In our study, we found that IAV infection promotes pro-IL-1β mRNA transcription and activates NLRP3 inflammasome. Detailed studies reveal that type I interferon (IFN-α/IFN-β) as well as U0126 (a selective inhibitor of MEK-1 and MEK-2) typically inhibit IAV-mediated NLRP3 inflammasome activation via downregulating pro-IL-1β mRNA. Moreover, knock-down of c-Jun decreases pro-IL-1β mRNA and inhibits NLRP3 inflammasome activation upon IAV infection. Overall, the findings uncover that AP-1 signaling pathway promotes NLRP3 inflammasome activation upon IAV infection, which provides a new idea for the therapy of NLRP3 inflammasome-associated inflammatory diseases.
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Affiliation(s)
- Pin Wan
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Simeng Zhang
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Zhihui Ruan
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Xueli Liu
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Ge Yang
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Yaling Jia
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Yongkui Li
- Foshan Institute of Medical Microbiology, Foshan, China.,Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Pan Pan
- The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, China
| | - Wenbiao Wang
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Geng Li
- Foshan Institute of Medical Microbiology, Foshan, China.,Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Xulin Chen
- Foshan Institute of Medical Microbiology, Foshan, China.,Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Zhixin Liu
- Department of Infectious Diseases, Department of Respiratory, Renmin Hospital, School of Basic Medical Sciences, Hubei University of Medicine, Shiyan, China
| | - Qiwei Zhang
- Foshan Institute of Medical Microbiology, Foshan, China.,Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Zhen Luo
- Foshan Institute of Medical Microbiology, Foshan, China.,Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Jianguo Wu
- Foshan Institute of Medical Microbiology, Foshan, China.,Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China.,State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China.,The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, China
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10
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Sobiepanek A, Kuryk Ł, Garofalo M, Kumar S, Baran J, Musolf P, Siebenhaar F, Fluhr JW, Kobiela T, Plasenzotti R, Kuchler K, Staniszewska M. The Multifaceted Roles of Mast Cells in Immune Homeostasis, Infections and Cancers. Int J Mol Sci 2022; 23:2249. [PMID: 35216365 PMCID: PMC8875910 DOI: 10.3390/ijms23042249] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Revised: 02/05/2022] [Accepted: 02/07/2022] [Indexed: 02/07/2023] Open
Abstract
Mast cells (MCs) play important roles in normal immune responses and pathological states. The location of MCs on the boundaries between tissues and the external environment, including gut mucosal surfaces, lungs, skin, and around blood vessels, suggests a multitude of immunological functions. Thus, MCs are pivotal for host defense against different antigens, including allergens and microbial pathogens. MCs can produce and respond to physiological mediators and chemokines to modulate inflammation. As long-lived, tissue-resident cells, MCs indeed mediate acute inflammatory responses such as those evident in allergic reactions. Furthermore, MCs participate in innate and adaptive immune responses to bacteria, viruses, fungi, and parasites. The control of MC activation or stabilization is a powerful tool in regulating tissue homeostasis and pathogen clearance. Moreover, MCs contribute to maintaining the homeostatic equilibrium between host and resident microbiota, and they engage in crosstalk between the resident and recruited hematopoietic cells. In this review, we provide a comprehensive overview of the functions of MCs in health and disease. Further, we discuss how mouse models of MC deficiency have become useful tools for establishing MCs as a potential cellular target for treating inflammatory disorders.
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Affiliation(s)
- Anna Sobiepanek
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland; (A.S.); (J.B.); (P.M.); (T.K.)
| | - Łukasz Kuryk
- National Institute of Public Health NIH—National Institute of Research, 00-791 Warsaw, Poland;
- Clinical Science, Targovax Oy, Lars Sonckin kaari 14, 02600 Espoo, Finland;
| | - Mariangela Garofalo
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Via F. Marzolo 5, 35131 Padova, Italy;
| | - Sandeep Kumar
- Clinical Science, Targovax Oy, Lars Sonckin kaari 14, 02600 Espoo, Finland;
| | - Joanna Baran
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland; (A.S.); (J.B.); (P.M.); (T.K.)
| | - Paulina Musolf
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland; (A.S.); (J.B.); (P.M.); (T.K.)
| | - Frank Siebenhaar
- Institute of Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 10117 Berlin, Germany; (F.S.); (J.W.F.)
- Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Allergology and Immunology, 12203 Berlin, Germany
| | - Joachim Wilhelm Fluhr
- Institute of Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 10117 Berlin, Germany; (F.S.); (J.W.F.)
- Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Allergology and Immunology, 12203 Berlin, Germany
| | - Tomasz Kobiela
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland; (A.S.); (J.B.); (P.M.); (T.K.)
| | - Roberto Plasenzotti
- Department of Biomedical Research, Medical University of Vienna, Währingergürtel 18-20, 1090 Vienna, Austria;
| | - Karl Kuchler
- Max Perutz Labs Vienna, Center for Medical Biochemistry, Medical University of Vienna, Campus Vienna Biocenter, Dr. Bohr-Gasse 9/2, 1030 Vienna, Austria;
| | - Monika Staniszewska
- Centre for Advanced Materials and Technologies, Warsaw University of Technology, Poleczki 19, 02-822 Warsaw, Poland
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11
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Gasdermin D and Beyond - Gasdermin-mediated Pyroptosis in Bacterial Infections. J Mol Biol 2021; 434:167409. [PMID: 34929200 DOI: 10.1016/j.jmb.2021.167409] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 12/13/2021] [Accepted: 12/13/2021] [Indexed: 12/21/2022]
Abstract
The discovery of pyroptosis and its subsequent implications in infection and immunity has uncovered a new angle of host-defence against pathogen assault. At its most simple, gasdermin-mediated pyroptosis in bacterial infection would be expected to remove pathogens from the relative safety of the cytosol or pathogen containing vacuole/phagosome whilst inducing a rapid and effective immune response. Differences in gasdermin-mediated pyroptosis between cell types, stimulation conditions, pathogen and even animal species, however, make things more complex. The excessive inflammation associated with the pathogen-induced gasdermin-mediated pyroptosis contributes to a downward spiral in sepsis. With no currently approved effective treatment options for sepsis understanding how gasdermin-mediated pyroptotic pathways are regulated provides an opportunity to identify novel therapeutic candidates against this complex disease. In this review we cover recent advances in the field of gasdermin-mediated pyroptosis with a focus on bacterial infection and sepsis models in the context of humans and other animal species. Importantly we also consider why there is considerable redundancy set into these ancient immune pathways.
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12
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Delaney MA, Hartigh AD, Carpentier SJ, Birkland TP, Knowles DP, Cookson BT, Frevert CW. Avoidance of the NLRP3 Inflammasome by the Stealth Pathogen, Coxiella burnetii. Vet Pathol 2021; 58:624-642. [PMID: 33357072 DOI: 10.1177/0300985820981369] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Coxiella burnetii, a highly adapted obligate intracellular bacterial pathogen and the cause of the zoonosis Q fever, is a reemerging public health threat. C. burnetii employs a Type IV secretion system (T4SS) to establish and maintain its intracellular niche and modulate host immune responses including the inhibition of apoptosis. Interactions between C. burnetii and caspase-1-mediated inflammasomes are not fully elucidated. This study confirms that C. burnetii does not activate caspase-1 during infection of mouse macrophages in vitro. C. burnetii-infected cells did not develop NLRP3 and ASC foci indicating its ability to avoid cytosolic detection. C. burnetii is unable to inhibit the pyroptosis and IL-1β secretion that is induced by potent inflammasome stimuli but rather enhances these caspase-1-mediated effects. We found that C. burnetii upregulates pro-IL-1β and robustly primes NLRP3 inflammasomes via TLR2 and MyD88 signaling. As for wildtype C. burnetii, T4SS-deficient mutants primed and potentiated NLRP3 inflammasomes. An in vivo model of pulmonary infection in C57BL/6 mice was developed. Mice deficient in NLRP3 or caspase-1 were like wildtype mice in the development and resolution of splenomegaly due to red pulp hyperplasia, and histologic lesions and macrophage kinetics, but had slightly higher pulmonary bacterial burdens at the greatest measured time point. Together these findings indicate that C. burnetii primes but avoids cytosolic detection by NLRP3 inflammasomes, which are not required for the clinical resistance of C57BL/6 mice. Determining mechanisms employed by C. burnetii to avoid cytosolic detection via NLRP3 inflammasomes will be beneficial to the development of preventative and interventional therapies for Q fever.
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Affiliation(s)
- Martha A Delaney
- Departments of Comparative Medicine and Pathology, and the Comparative Pathology Program, 7284University of Washington, Seattle, WA
- Current address: Martha A. Delaney, Zoological Pathology Program, University of Illinois, Brookfield, IL, USA
| | - Andreas den Hartigh
- Departments of Microbiology and Lab Medicine, 7284University of Washington, Seattle, WA
| | - Samuel J Carpentier
- Departments of Microbiology and Lab Medicine, 7284University of Washington, Seattle, WA
| | - Timothy P Birkland
- Departments of Comparative Medicine and Pathology, and the Comparative Pathology Program, 7284University of Washington, Seattle, WA
| | - Donald P Knowles
- Animal Disease Research Unit, Agricultural Research Service, United States Department of Agriculture, Pullman, WA
- Department of Veterinary Microbiology and Pathology, 6760Washington State University, Pullman, WA
| | - Brad T Cookson
- Departments of Microbiology and Lab Medicine, 7284University of Washington, Seattle, WA
| | - Charles W Frevert
- Departments of Comparative Medicine and Pathology, and the Comparative Pathology Program, 7284University of Washington, Seattle, WA
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13
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Li YY, Cai Q, Li BS, Qiao SW, Jiang JY, Wang D, Du XC, Meng WY. The Effect of Porphyromonas gingivalis Lipopolysaccharide on the Pyroptosis of Gingival Fibroblasts. Inflammation 2021; 44:846-858. [PMID: 33140204 DOI: 10.1007/s10753-020-01379-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/14/2020] [Accepted: 10/27/2020] [Indexed: 12/14/2022]
Abstract
Periodontitis is a chronic inflammatory disease induced by Porphyromonas gingivalis (P. gingivalis) and other pathogens. P. gingivalis release various virulence factors including lipopolysaccharide (LPS). However, whether P. gingivalis-LPS inducing pyroptosis in human gingival fibroblasts (HGFs) remains unknown. In present study, P. gingivalis-LPS decreased the membrane integrity of HGFs, and pyroptosis-associated cytokines were upregulated at the mRNA level. In addition, pyroptosis proteins were highly expressed in gingival tissues of periodontitis. P. gingivalis-LPS induced gingivitis in the rat model, and the expression level of pyroptosis-associated proteins increased. Together, P. gingivalis-LPS can activate the pyroptosis reaction, which may be a pro-pyroptosis status in a relative low concentration.
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Affiliation(s)
- Yu-Yang Li
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, Jilin, China
| | - Qing Cai
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China
| | - Bao-Sheng Li
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China
| | - Shu-Wei Qiao
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, Jilin, China
| | - Jia-Yang Jiang
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, Jilin, China
| | - Dan Wang
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, Jilin, China
| | - Xue-Chun Du
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, Jilin, China
| | - Wei-Yan Meng
- Department of Dental Implantology, Hospital of Stomatology, Jilin University, Changchun, Jilin, China.
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14
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Modulation of Bovine Endometrial Cell Receptors and Signaling Pathways as a Nanotherapeutic Exploration against Dairy Cow Postpartum Endometritis. Animals (Basel) 2021; 11:ani11061516. [PMID: 34071093 PMCID: PMC8224678 DOI: 10.3390/ani11061516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/19/2021] [Accepted: 05/20/2021] [Indexed: 12/16/2022] Open
Abstract
Simple Summary The provision of updated information on the molecular pathogenesis of bovine endometritis with host-pathogen interactions and the possibility of exploring the cellular sensors mechanism in a nanotechnology-based drug delivery system against persistent endometritis were reported in this review. The mechanism of Gram-negative bacteria and their ligands has been vividly explored, with the paucity of research detail on Gram-positive bacteria in bovine endometritis. The function of cell receptors, biomolecules proteins, and sensors were reportedly essential in transferring signals into cell signaling pathways to induce immuno-inflammatory responses by elevating pro-inflammatory cytokines. Therefore, understanding endometrial cellular components and signaling mechanisms across pathogenesis are essential for nanotherapeutic exploration against bovine endometritis. The nanotherapeutic discovery that could inhibit infectious signals at the various cell receptors and signal transduction levels, interfering with transcription factors activation and pro-inflammatory cytokines and gene expression, significantly halts endometritis. Abstract In order to control and prevent bovine endometritis, there is a need to understand the molecular pathogenesis of the infectious disease. Bovine endometrium is usually invaded by a massive mobilization of microorganisms, especially bacteria, during postpartum dairy cows. Several reports have implicated the Gram-negative bacteria in the pathogenesis of bovine endometritis, with information dearth on the potentials of Gram-positive bacteria and their endotoxins. The invasive bacteria and their ligands pass through cellular receptors such as TLRs, NLRs, and biomolecular proteins of cells activate the specific receptors, which spontaneously stimulates cellular signaling pathways like MAPK, NF-kB and sequentially triggers upregulation of pro-inflammatory cytokines. The cascade of inflammatory induction involves a dual signaling pathway; the transcription factor NF-κB is released from its inhibitory molecule and can bind to various inflammatory genes promoter. The MAPK pathways are concomitantly activated, leading to specific phosphorylation of the NF-κB. The provision of detailed information on the molecular pathomechanism of bovine endometritis with the interaction between host endometrial cells and invasive bacteria in this review would widen the gap of exploring the potential of receptors and signal transduction pathways in nanotechnology-based drug delivery system. The nanotherapeutic discovery of endometrial cell receptors, signal transduction pathway, and cell biomolecules inhibitors could be developed for strategic inhibition of infectious signals at the various cell receptors and signal transduction levels, interfering on transcription factors activation and pro-inflammatory cytokines and genes expression, which may significantly protect endometrium against postpartum microbial invasion.
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15
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Sun X, Wang X, Zhao Z, Chen J, Li C, Zhao G. Paeoniflorin inhibited nod-like receptor protein-3 inflammasome and NF-κB-mediated inflammatory reactions in diabetic foot ulcer by inhibiting the chemokine receptor CXCR2. Drug Dev Res 2020; 82:404-411. [PMID: 33236457 DOI: 10.1002/ddr.21763] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 10/15/2020] [Accepted: 11/10/2020] [Indexed: 01/10/2023]
Abstract
Diabetic foot ulcer (DFU) is an invariably common complication of diabetes, characterized by delayed wound healing process and increased inflammation. Evidence has indicated that paeoniflorin exerts an anti-inflammatory effect in diabetic retinopathy. The current work was aimed to investigate the effect of paeoniflorin on inflammation and wound healing in DFU. DFU rat models by streptozotocin and skin biopsy punch, as well as high glucose-treated human immortalized keratinocytes (HaCaT) were established. Levels of blood glucose, wound contraction and proinflammatory cytokine were detected after paeoniflorin administration. Several essential targets associated with the NF-κB and Nod-like receptor protein-3 (NLRP3) signaling pathways were examined. Results showed markedly down-regulation of interleukin (IL)-1β, IL-18 and tumor necrosis factor-alpha in paeoniflorin-treated DFU rats. Paeoniflorin decreased the expression levels of chemokine receptor CXCR2, nuclear NF-κB and p-IκB (Ser36), as well as increased IκB level. Histological analysis and immunostaining showed lower inflammatory cells with decreased NLRP3 and cleaved caspase-1 levels following paeoniflorin treatment. Further in vitro evidence confirmed that paeoniflorin efficiently inhibited NLRP3 and NF-κB-mediated inflammation in DFU by inhibiting CXCR2. These findings are suggestive of greatly attenuated wound inflammation and better wound healing in paeoniflorin-treated DFU rats. Our study demonstrates that paeoniflorin is a potential therapeutic agent for DFU.
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Affiliation(s)
- Xiaolong Sun
- The Second Department of Surgery, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, China
| | - Xu Wang
- The Second Department of Surgery, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, China
| | - Zhenyu Zhao
- The Second Department of Surgery, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, China
| | - Jing Chen
- The Second Department of Surgery, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, China
| | - Cheng Li
- The Second Department of Surgery, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, China
| | - Gang Zhao
- Department of Peripheral Vascular Disease, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang, China
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16
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Molla MD, Akalu Y, Geto Z, Dagnew B, Ayelign B, Shibabaw T. Role of Caspase-1 in the Pathogenesis of Inflammatory-Associated Chronic Noncommunicable Diseases. J Inflamm Res 2020; 13:749-764. [PMID: 33116753 PMCID: PMC7585796 DOI: 10.2147/jir.s277457] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 09/21/2020] [Indexed: 12/12/2022] Open
Abstract
Caspase-1 is the first and extensively studied inflammatory caspase that is activated through inflammasome assembly. Inflammasome is a cytosolic formation of multiprotein complex that aimed to start inflammatory response against infections or cellular damages. The process leads to an auto-activation of caspase-1 and consequent maturation of caspase-1 target molecules such as interleukin (IL)-1β and IL-18. Recently, the role of caspase-1 and inflammasome in inflammatory-induced noncommunicable diseases (NCDs) like obesity, diabetes mellitus (DM), cardiovascular diseases (CVDs), cancers and chronic respiratory diseases have widely studied. However, their reports are distinct and even they have reported contrasting role of caspase-1 in the development and progression of NCDs. A few studies have reported that caspase-1/inflammasome assembley has a protective role in the initiation and progression of these diseases through the activation of the noncanonical caspase-1 target substrates like gasdermin-D and regulation of immune cells. Conversely, others have revealed that caspase-1 has a direct/indirect effect in the development and progression of several NCDs. Therefore, in this review, we systematically summarized the role of caspase-1 in the development and progression of NCDs, especially in obesity, DM, CVDs and cancers.
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Affiliation(s)
- Meseret Derbew Molla
- Department of Biochemistry, School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Yonas Akalu
- Department of Human Physiology, School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Zeleke Geto
- Department of Biomedical Sciences, School of Medicine, College of Medicine and Health Sciences, Wollo University, Dessie, Ethiopia
| | - Baye Dagnew
- Department of Human Physiology, School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Birhanu Ayelign
- Department of Immunology and Molecular Biology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Tewodros Shibabaw
- Department of Biochemistry, School of Medicine, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
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17
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Leng F, Yin H, Qin S, Zhang K, Guan Y, Fang R, Wang H, Li G, Jiang Z, Sun F, Wang DC, Xie C. NLRP6 self-assembles into a linear molecular platform following LPS binding and ATP stimulation. Sci Rep 2020; 10:198. [PMID: 31932628 PMCID: PMC6957519 DOI: 10.1038/s41598-019-57043-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 12/19/2019] [Indexed: 12/21/2022] Open
Abstract
NOD-like receptors (NLRs) localize in the cytosol to recognize intracellular pathogen products and initialize the innate immune response. However, the ligands and ligand specificity of many NLRs remain unclear. One such NLR, NLRP6, plays an important role in maintaining intestinal homeostasis and protecting against various intestinal diseases such as colitis and intestinal tumorigenesis. Here, we show that the major component of the outer membrane of gram-negative bacteria, lipopolysaccharide (LPS), binds NLRP6 directly and induces global conformational change and dimerization. Following stimulation by ATP, the NLRP6 homodimer can further assemble into a linear molecular platform, and ASC is recruited to form higher molecular structures, indicative of a step-by-step activation mechanism. Our study sheds light on the mystery of LPS-induced inflammasome initiation, reveals the architecture and structural basis of potential pre-inflammasome, and suggests a novel molecular assembly pattern for immune receptors.
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Affiliation(s)
- Fangwei Leng
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.,State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China.,Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, 02115, USA
| | - Hang Yin
- State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China.,Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, 47907, USA
| | - Siying Qin
- State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China
| | - Kai Zhang
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yukun Guan
- State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Run Fang
- State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Honglei Wang
- Laboratory of Molecular Modeling and Design, State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, 116023, China
| | - Guohui Li
- Laboratory of Molecular Modeling and Design, State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, 116023, China
| | - Zhengfan Jiang
- State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Fei Sun
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Da-Cheng Wang
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Can Xie
- State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China. .,High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
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18
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Xia B, Yu J, He T, Liu X, Su J, Wang M, Wang J, Zhu Y. Lactobacillus johnsonii L531 ameliorates enteritis via elimination of damaged mitochondria and suppression of SQSTM1-dependent mitophagy in a Salmonella infantis model of piglet diarrhea. FASEB J 2019; 34:2821-2839. [PMID: 31908018 DOI: 10.1096/fj.201901445rrr] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 12/10/2019] [Accepted: 12/10/2019] [Indexed: 01/04/2023]
Abstract
Newly weaned piglets challenged with Salmonella infantis were particularly susceptible, whereas oral preadministration of Lactobacillus johnsonii L531 alleviated enteritis and promoted intestinal secretory IgA production. Salmonella infantis-induced activation of NLRC4 and NLRP3 inflammasomes and (nuclear factor kappa B) NF-κB signaling in the small intestine was also inhibited by L. johnsonii L531 pretreatment, thus limiting inflammation. An IPEC-J2 cell model of S. infantis infection yielded similar results. Salmonella infantis infection also resulted in mitochondrial damage and impaired mitophagy in the ileum and IPEC-J2 cells, as demonstrated by immunofluorescence colocalization of mitochondria with microtubule-binding protein light chain 3 (LC3) and high expression of autophagy-related proteins PTEN-induced putative kinase 1 (PINK1), sequestosome 1 (SQSTM1/p62), optineurin (OPTN), and LC3 by Western blotting analysis. However, L. johnsonii L531 pretreatment reduced both the extent of mitochondrial damage and autophagy-related protein expression. Our findings suggest that the amelioration of S. infantis-associated enteritis by L. johnsonii L531 is associated with regulation of NLRC4 and NLRP3 inflammasomes and NF-κB signaling pathway activation and suppression of mitochondrial damage. Amelioration of impaired mitophagy by L. johnsonii L531 could involve eliminating damaged mitochondria and regulating S. infantis-induced activation of the NF-κB-SQSTM1mitophagy signaling pathway in host cells to prevent the further mitochondrial damage and S. infantis dissemination.
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Affiliation(s)
- Bing Xia
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Jiao Yu
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Ting He
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Xiao Liu
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Jinhui Su
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Meijun Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Jiufeng Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Yaohong Zhu
- College of Veterinary Medicine, China Agricultural University, Beijing, China
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19
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Westfall S, Pasinetti GM. The Gut Microbiota Links Dietary Polyphenols With Management of Psychiatric Mood Disorders. Front Neurosci 2019; 13:1196. [PMID: 31749681 PMCID: PMC6848798 DOI: 10.3389/fnins.2019.01196] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 10/22/2019] [Indexed: 12/20/2022] Open
Abstract
The pathophysiology of depression is multifactorial yet generally aggravated by stress and its associated physiological consequences. To effectively treat these diverse risk factors, a broad acting strategy is required and is has been suggested that gut-brain-axis signaling may play a pinnacle role in promoting resilience to several of these stress-induced changes including pathogenic load, inflammation, HPA-axis activation, oxidative stress and neurotransmitter imbalances. The gut microbiota also manages the bioaccessibility of phenolic metabolites from dietary polyphenols whose multiple beneficial properties have known therapeutic efficacy against depression. Although several potential therapeutic mechanisms of dietary polyphenols toward establishing cognitive resilience to neuropsychiatric disorders have been established, only a handful of studies have systematically identified how the interaction of the gut microbiota with dietary polyphenols can synergistically alleviate the biological signatures of depression. The current review investigates several of these potential mechanisms and how synbiotics, that combine probiotics with dietary polyphenols, may provide a novel therapeutic strategy for depression. In particular, synbiotics have the potential to alleviate neuroinflammation by modulating microglial and inflammasome activation, reduce oxidative stress and balance serotonin metabolism therefore simultaneously targeting several of the major pathological risk factors of depression. Overall, synbiotics may act as a novel therapeutic paradigm for neuropsychiatric disorders and further understanding the fundamental mechanisms of gut-brain-axis signaling will allow full utilization of the gut microbiota's as a therapeutic tool.
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Affiliation(s)
| | - Giulio Maria Pasinetti
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
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20
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Theofani E, Semitekolou M, Morianos I, Samitas K, Xanthou G. Targeting NLRP3 Inflammasome Activation in Severe Asthma. J Clin Med 2019; 8:jcm8101615. [PMID: 31590215 PMCID: PMC6833007 DOI: 10.3390/jcm8101615] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 09/24/2019] [Accepted: 09/26/2019] [Indexed: 12/20/2022] Open
Abstract
Severe asthma (SA) is a chronic lung disease characterized by recurring symptoms of reversible airflow obstruction, airway hyper-responsiveness (AHR), and inflammation that is resistant to currently employed treatments. The nucleotide-binding oligomerization domain-like Receptor Family Pyrin Domain Containing 3 (NLRP3) inflammasome is an intracellular sensor that detects microbial motifs and endogenous danger signals and represents a key component of innate immune responses in the airways. Assembly of the NLRP3 inflammasome leads to caspase 1-dependent release of the pro-inflammatory cytokines IL-1β and IL-18 as well as pyroptosis. Accumulating evidence proposes that NLRP3 activation is critically involved in asthma pathogenesis. In fact, although NLRP3 facilitates the clearance of pathogens in the airways, persistent NLRP3 activation by inhaled irritants and/or innocuous environmental allergens can lead to overt pulmonary inflammation and exacerbation of asthma manifestations. Notably, administration of NLRP3 inhibitors in asthma models restrains AHR and pulmonary inflammation. Here, we provide an overview of the pathophysiology of SA, present molecular mechanisms underlying aberrant inflammatory responses in the airways, summarize recent studies pertinent to the biology and functions of NLRP3, and discuss the role of NLRP3 in the pathogenesis of asthma. Finally, we contemplate the potential of targeting NLRP3 as a novel therapeutic approach for the management of SA.
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Affiliation(s)
- Efthymia Theofani
- Cellular Immunology Laboratory, Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece
| | - Maria Semitekolou
- Cellular Immunology Laboratory, Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece
| | - Ioannis Morianos
- Cellular Immunology Laboratory, Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece
| | - Konstantinos Samitas
- 7th Respiratory Clinic and Asthma Center, 'Sotiria' Athens Chest Hospital, 11527 Athens, Greece
| | - Georgina Xanthou
- Cellular Immunology Laboratory, Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece.
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21
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Gutierrez Jauregui R, Fleige H, Bubke A, Rohde M, Weiss S, Förster R. IL-1β Promotes Staphylococcus aureus Biofilms on Implants in vivo. Front Immunol 2019; 10:1082. [PMID: 31156635 PMCID: PMC6534041 DOI: 10.3389/fimmu.2019.01082] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 04/29/2019] [Indexed: 12/14/2022] Open
Abstract
Implant associated infections represent a serious health burden in clinics since some microorganisms are able to colonize biological surfaces or surfaces of indwelling medical devices and form biofilms. Biofilms represent communities of microorganisms attached to hydrated surfaces and enclosed in self-produced extracellular matrix. This renders them resistant to exogenous assaults like antibiotics or immune effector mechanisms. Little is known regarding the role of the immune system in the formation of biofilms during implant associated infections, largely due to the lack of suitable mouse models. Here we use colonized osmotic pumps in mice to study the interaction of an activated immune system with biofilm-forming Staphylococcus aureus encoding Gaussia luciferase. This approach permits biofilm formation on the osmotic pumps in living animals. It also allows the continuous supply of soluble immune cell activating agents, such as cytokines to study their effect on biofilm formation in vivo. Using non-invasive imaging of the bioluminescent signal emitted by the lux expressing bacteria for quantification of bacterial load in conjunction with light and electron microscopy, we observed that pump-supplied pro-inflammatory cytokine IL-1β strongly increased biofilm formation along with a massive influx of neutrophils adjacent to the biofilm-coated pumps. Thus, our data demonstrate that immune defense mechanisms can augment biofilm formation.
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Affiliation(s)
| | - Henrike Fleige
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Anja Bubke
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Manfred Rohde
- Central Facility for Microscopy, Helmholz Center for Infection Research, Braunschweig, Germany
| | - Siegfried Weiss
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Reinhold Förster
- Institute of Immunology, Hannover Medical School, Hannover, Germany.,RESIST, Cluster of Excellence 2155, Hannover Medical School, Hannover, Germany
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22
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Dhillon B, Aleithan F, Abdul-Sater Z, Abdul-Sater AA. The Evolving Role of TRAFs in Mediating Inflammatory Responses. Front Immunol 2019; 10:104. [PMID: 30778351 PMCID: PMC6369152 DOI: 10.3389/fimmu.2019.00104] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 01/14/2019] [Indexed: 12/31/2022] Open
Abstract
TRAFs [tumor necrosis factor (TNF) receptor associated factors] are a family of signaling molecules that function downstream of multiple receptor signaling pathways and play a pivotal role in the biology of innate, and adaptive immune cells. Following receptor ligation, TRAFs generally function as adapter proteins to mediate the activation of intracellular signaling cascades. With the exception of TRAF1 that lacks a Ring domain, TRAFs have an E3 ubiquitin ligase activity which also contributes to their ability to activate downstream signaling pathways. TRAF-mediated signaling pathways culminate in the activation of several transcription factors, including nuclear factor-κB (NF-κB), mitogen-activated protein kinases (MAPKs; e.g., ERK-1 and ERK-2, JNK, and p38), and interferon-regulatory factors (IRF; e.g., IRF3 and IRF7). The biological role of TRAFs is largely due to their ability to positively or negatively regulate canonical and non-canonical NF-κB signaling. While TRAF-mediated signaling regulates various immune cell functions, this review is focused on the recent advances in our knowledge regarding the molecular mechanisms through which TRAF proteins regulate, positively and negatively, inflammatory signaling pathways, including Toll-IL-1 receptors, RIG-I like receptors, and Nod-like receptors. The review also offers a perspective on the unanswered questions that need to be addressed to fully understand how TRAFs regulate inflammation.
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Affiliation(s)
- Bipandeep Dhillon
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Fatemah Aleithan
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Zahi Abdul-Sater
- Department of Basic Sciences, Phoenicia University, Mazraat El Daoudiyeh, Lebanon
| | - Ali A Abdul-Sater
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
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23
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Dai X, Jian C, Li N, Li D. Characterization of the L genome segment of an orthohantavirus isolated from Niviventer confucianus. Arch Virol 2018; 164:613-616. [PMID: 30350033 DOI: 10.1007/s00705-018-4074-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 09/26/2018] [Indexed: 02/02/2023]
Abstract
We sequenced and analyzed the L segment of the RNA genome of Hantaan virus (HTNV) strain NC167. This segment is 6,533 nucleotides in length and contains a single open reading frame (ORF) of 6,456 nucleotides in the antigenome sense that encodes the viral RNA-dependent RNA polymerase, which is 2,153 amino acids long with a predicted molecular mass of 246 kDa. The 5' terminus of the viral RNA was found to contain the expected sequences that are conserved in orthohantaviruses. According to the phylogenetics and levels of sequence similarity, the L segment of HTNV NC167 is similar to but clearly distinct from the L segments of other orthohantaviruses.
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Affiliation(s)
- Xiaoxia Dai
- Key Laboratory of Trace Elements and Endemic Diseases of National Health Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, China.
| | - Can Jian
- Key Laboratory of Trace Elements and Endemic Diseases of National Health Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, China
| | - Na Li
- Key Laboratory of Trace Elements and Endemic Diseases of National Health Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, China
| | - Dexin Li
- NHFPC Key Laboratory for Medical Virology, National Institute for Viral Disease Control and Prevention, China CDC, Beijing, China.
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24
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Xiao Y, Xu W, Su W. NLRP3 inflammasome: A likely target for the treatment of allergic diseases. Clin Exp Allergy 2018; 48:1080-1091. [PMID: 29900602 DOI: 10.1111/cea.13190] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/25/2018] [Accepted: 06/11/2018] [Indexed: 12/28/2022]
Abstract
Allergic diseases, such as asthma, rhinitis, dermatitis, conjunctivitis, and anaphylaxis, have recently become a global public health concern. According to previous studies, the NLRP3 inflammasome is a multi-protein complex known to be associated with many inflammatory conditions. In response to allergens or allergen/damage-associated molecular signals, NLRP3 changes its conformation to allow the assembly of the NLRP3 inflammasome complex and activates caspase-1, which is an evolutionarily conserved enzyme that proteolytically cleaves other proteins, such as the precursors of the inflammatory cytokines IL-1β and IL-18. Subsequently, active caspase-1 cleaves pro-IL-1 and pro-IL-18. Recently, accumulating human and mouse experimental evidence has demonstrated that the NLRP3 inflammasome, IL-1β, and IL-18 are critically involved in the development of allergic diseases. Furthermore, the application of specific NLRP3 inflammasome inhibitors has been demonstrated in animal models. Therefore, these inhibitors may represent potential therapeutic methods for the management of clinical allergic disorders. This review summarizes findings related to the NLRP3 inflammasome and its related factors and concludes that specific NLRP3 inflammasome inhibitors may be potential therapeutic agents for allergic diseases.
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Affiliation(s)
- Yichen Xiao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Wenna Xu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Wenru Su
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
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Ravi Kumar S, Paudel S, Ghimire L, Bergeron S, Cai S, Zemans RL, Downey GP, Jeyaseelan S. Emerging Roles of Inflammasomes in Acute Pneumonia. Am J Respir Crit Care Med 2018; 197:160-171. [PMID: 28930487 PMCID: PMC5768907 DOI: 10.1164/rccm.201707-1391pp] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 09/19/2017] [Indexed: 12/11/2022] Open
Affiliation(s)
- Sangeetha Ravi Kumar
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana
| | - Sagar Paudel
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana
| | - Laxman Ghimire
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana
| | - Scott Bergeron
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana
| | - Shanshan Cai
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana
| | - Rachel L. Zemans
- Division of Pulmonary, Sleep, and Critical Care Medicine, Department of Medicine, National Jewish Health, Denver, Colorado
- Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado, Denver, Aurora, Colorado; and
| | - Gregory P. Downey
- Division of Pulmonary, Sleep, and Critical Care Medicine, Department of Medicine, National Jewish Health, Denver, Colorado
- Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado, Denver, Aurora, Colorado; and
| | - Samithamby Jeyaseelan
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana
- Section of Pulmonary and Critical Care Medicine, Department of Medicine, Louisiana State University Health Sciences Center, New Orleans, Louisiana
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Jamilloux Y, Lefeuvre L, Magnotti F, Martin A, Benezech S, Allatif O, Penel-Page M, Hentgen V, Sève P, Gerfaud-Valentin M, Duquesne A, Desjonquères M, Laurent A, Rémy-Piccolo V, Cimaz R, Cantarini L, Bourdonnay E, Walzer T, Py BF, Belot A, Henry T. Familial Mediterranean fever mutations are hypermorphic mutations that specifically decrease the activation threshold of the Pyrin inflammasome. Rheumatology (Oxford) 2017; 57:100-111. [PMID: 29040788 DOI: 10.1093/rheumatology/kex373] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Indexed: 12/31/2022] Open
Abstract
Objectives FMF is the most frequent autoinflammatory disease and is associated in most patients with bi-allelic MEFV mutations. MEFV encodes Pyrin, an inflammasome sensor activated following RhoGTPase inhibition. The functional consequences of MEFV mutations on the ability of Pyrin variants to act as inflammasome sensors are largely unknown. The aim of this study was to assess whether MEFV mutations affect the ability of Pyrin to detect RhoGTPase inhibition and other inflammasome stimuli. Methods IL-1β and IL-18 released by monocytes from healthy donors (HDs) and FMF patients were measured upon specific engagement of the Pyrin, NLRP3 and NLRC4 inflammasomes. Cell death kinetics following Pyrin activation was monitored in real time. Results Monocytes from FMF patients secreted significantly more IL-1β and IL-18 and died significantly faster than HD monocytes in response to low concentrations of Clostridium difficile toxin B (TcdB), a Pyrin-activating stimulus. Monocytes from patients bearing two MEFV exon 10 pathogenic variants displayed an increased Pyrin inflammasome response compared with monocytes from patients with a single exon 10 pathogenic variant indicating a gene-dosage effect. Using a short priming step, the response of monocytes from FMF patients to NLRP3- and NLRC4-activating stimuli was normal indicating that MEFV mutations trigger a specific hypersensitivity of monocytes to low doses of a Pyrin-engaging stimulus. Conclusion Contrary to the NLRP3 mutations described in cryopyrin-associated periodic syndrome, FMF-associated MEFV mutations do not lead to a constitutive activation of Pyrin. Rather, FMF-associated mutations are hypermorphic mutations that specifically decrease the activation threshold of the Pyrin inflammasome without affecting other canonical inflammasomes.
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Affiliation(s)
- Yvan Jamilloux
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
- Department of Internal Medicine, University Hospital Croix-Rousse, Hospices Civils de Lyon
| | - Lucie Lefeuvre
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
- Department of General Medicine, Hospices Civils de Lyon, Lyon, France
| | - Flora Magnotti
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
- Pediatric Rheumatology Unit, AOU Meyer, University of Firenze, Firenze
- Research Center of Systemic Autoinflammatory Diseases and Behcet's Disease Clinic, Rheumatology Unit, University of Siena, Siena, Italy
| | - Amandine Martin
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
| | - Sarah Benezech
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
| | - Omran Allatif
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
- Bioinformatics and Biostatistics Service (BIBS), University of Lyon, Lyon
| | - Mathilde Penel-Page
- Department of Paediatric Nephrology, Rheumatology, Dermatology, Hôpital Femme-Mère Enfant, Bron
| | - Véronique Hentgen
- French Reference Centre for Autoinflammatory Diseases (CEREMAI), Versailles Hospital, Le Chesnay
| | - Pascal Sève
- Department of Internal Medicine, University Hospital Croix-Rousse, Hospices Civils de Lyon
| | | | - Agnès Duquesne
- Department of Paediatric Nephrology, Rheumatology, Dermatology, Hôpital Femme-Mère Enfant, Bron
| | - Marine Desjonquères
- Department of Paediatric Nephrology, Rheumatology, Dermatology, Hôpital Femme-Mère Enfant, Bron
| | - Audrey Laurent
- Department of Paediatric Nephrology, Rheumatology, Dermatology, Hôpital Femme-Mère Enfant, Bron
| | - Vanessa Rémy-Piccolo
- Department of Paediatric Rheumatology, Hôpital Nord Ouest, Villefranche sur Saône, France
| | - Rolando Cimaz
- Pediatric Rheumatology Unit, AOU Meyer, University of Firenze, Firenze
| | - Luca Cantarini
- Research Center of Systemic Autoinflammatory Diseases and Behcet's Disease Clinic, Rheumatology Unit, University of Siena, Siena, Italy
| | - Emilie Bourdonnay
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
| | - Thierry Walzer
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
| | - Bénédicte F Py
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
| | - Alexandre Belot
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
- Department of Paediatric Nephrology, Rheumatology, Dermatology, Hôpital Femme-Mère Enfant, Bron
| | - Thomas Henry
- Centre International de Recherche en Infectiologie (CIRI), Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon, F-69007
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Human Parvovirus Infection of Human Airway Epithelia Induces Pyroptotic Cell Death by Inhibiting Apoptosis. J Virol 2017; 91:JVI.01533-17. [PMID: 29021400 DOI: 10.1128/jvi.01533-17] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 10/03/2017] [Indexed: 02/06/2023] Open
Abstract
Human bocavirus 1 (HBoV1) is a human parvovirus that causes acute respiratory tract infections in young children. In this study, we confirmed that, when polarized/well-differentiated human airway epithelia are infected with HBoV1 in vitro, they develop damage characterized by barrier function disruption and cell hypotrophy. Cell death mechanism analyses indicated that the infection induced pyroptotic cell death characterized by caspase-1 activation. Unlike infections with other parvoviruses, HBoV1 infection did not activate the apoptotic or necroptotic cell death pathway. When the NLRP3-ASC-caspase-1 inflammasome-induced pathway was inhibited by short hairpin RNA (shRNA), HBoV1-induced cell death dropped significantly; thus, NLRP3 mediated by ASC appears to be the pattern recognition receptor driving HBoV1 infection-induced pyroptosis. HBoV1 infection induced steady increases in the expression of interleukin 1α (IL-1α) and IL-18. HBoV1 infection was also associated with the marked expression of the antiapoptotic genes BIRC5 and IFI6 When the expression of BIRC5 and/or IFI6 was inhibited by shRNA, the infected cells underwent apoptosis rather than pyroptosis, as indicated by increased cleaved caspase-3 levels and the absence of caspase-1. BIRC5 and/or IFI6 gene inhibition also significantly reduced HBoV1 replication. Thus, HBoV1 infection of human airway epithelial cells activates antiapoptotic proteins that suppress apoptosis and promote pyroptosis. This response may have evolved to confer a replicative advantage, thus allowing HBoV1 to establish a persistent airway epithelial infection. This is the first report of pyroptosis in airway epithelia infected by a respiratory virus.IMPORTANCE Microbial infection of immune cells often induces pyroptosis, which is mediated by a cytosolic protein complex called the inflammasome that senses microbial pathogens and then activates the proinflammatory cytokines IL-1 and IL-18. While virus-infected airway epithelia often activate NLRP3 inflammasomes, studies to date suggest that these viruses kill the airway epithelial cells via the apoptotic or necrotic pathway; involvement of the pyroptosis pathway has not been reported previously. Here, we show for the first time that virus infection of human airway epithelia can also induce pyroptosis. Human bocavirus 1 (HBoV1), a human parvovirus, causes lower respiratory tract infections in young children. This study indicates that HBoV1 kills airway epithelial cells by activating genes that suppress apoptosis and thereby promote pyroptosis. This strategy appears to promote HBoV1 replication and may have evolved to allow HBoV1 to establish persistent infection of human airway epithelia.
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Aryanpour R, Pasbakhsh P, Zibara K, Namjoo Z, Beigi Boroujeni F, Shahbeigi S, Kashani IR, Beyer C, Zendehdel A. Progesterone therapy induces an M1 to M2 switch in microglia phenotype and suppresses NLRP3 inflammasome in a cuprizone-induced demyelination mouse model. Int Immunopharmacol 2017; 51:131-139. [PMID: 28830026 DOI: 10.1016/j.intimp.2017.08.007] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 05/14/2017] [Accepted: 08/09/2017] [Indexed: 12/14/2022]
Abstract
Demyelination of the central nervous system (CNS) has been associated to reactive microglia in neurodegenerative disorders, such as multiple sclerosis (MS). The M1 microglia phenotype plays a pro-inflammatory role while M2 is involved in anti-inflammatory processes in the brain. In this study, CPZ-induced demyelination mouse model was used to investigate the effect of progesterone (PRO) therapy on microglia activation and neuro-inflammation. Results showed that progesterone therapy (CPZ+PRO) decreased neurological behavioral deficits, as demonstrated by significantly decreased escape latencies, in comparison to CPZ mice. In addition, CPZ+PRO caused a significant reduction in the mRNA expression levels of M1-markers (iNOS, CD86, MHC-II and TNF-α) in the corpus callosum region, whereas the expression of M2-markers (Trem-2, CD206, Arg-1 and TGF-β) was significantly increased, in comparison to CPZ mice. Moreover, CPZ+PRO resulted in a significant decrease in the number of iNOS+ and Iba-1+/iNOS+ cells (M1), whereas TREM-2+ and Iba-1+/TREM-2+ cells (M2) significantly increased, in comparison to CPZ group. Furthermore, CPZ+PRO caused a significant decrease in mRNA and protein expression levels of NLRP3 and IL-18 (~2-fold), in comparison to the CPZ group. Finally, CPZ+PRO therapy was accompanied with reduced levels of demyelination, compared to CPZ, as confirmed by immunofluorescence to myelin basic protein (MBP) and Luxol Fast Blue (LFB) staining, as well as transmission electron microscopy (TEM) analysis. In summary, we reported for the first time that PRO therapy causes polarization of M2 microglia, attenuation of M1 phenotype, and suppression of NLRP3 inflammasome in a CPZ-induced demyelination model of MS.
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Affiliation(s)
- Roya Aryanpour
- Department of Anatomy, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Parichehr Pasbakhsh
- Department of Anatomy, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Kazem Zibara
- ER045, Laboratory of Stem Cells, DSST, Biology Department, Faculty of Sciences, Lebanese University, Beirut, Lebanon
| | - Zeinab Namjoo
- Department of Anatomy, Faculty of Medicine, Iran University of Medical Science, Tehran, Iran
| | - Fatemeh Beigi Boroujeni
- Department of Anatomy, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Saeed Shahbeigi
- Department of Anatomy, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Iraj Ragerdi Kashani
- Department of Anatomy, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
| | - Cordian Beyer
- Institute of Neuroanatomy, RWTH Aachen University, Aachen, Germany
| | - Adib Zendehdel
- Institute of Neuroanatomy, RWTH Aachen University, Aachen, Germany; Giulan Neuroscience Research Center, Department of Anatomical Sciences, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran
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Tursi SA, Lee EY, Medeiros NJ, Lee MH, Nicastro LK, Buttaro B, Gallucci S, Wilson RP, Wong GCL, Tükel Ç. Bacterial amyloid curli acts as a carrier for DNA to elicit an autoimmune response via TLR2 and TLR9. PLoS Pathog 2017; 13:e1006315. [PMID: 28410407 PMCID: PMC5406031 DOI: 10.1371/journal.ppat.1006315] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 04/26/2017] [Accepted: 03/24/2017] [Indexed: 12/27/2022] Open
Abstract
Bacterial biofilms are associated with numerous human infections. The predominant protein expressed in enteric biofilms is the amyloid curli, which forms highly immunogenic complexes with DNA. Infection with curli-expressing bacteria or systemic exposure to purified curli-DNA complexes triggers autoimmunity via the generation of type I interferons (IFNs) and anti-double-stranded DNA antibodies. Here, we show that DNA complexed with amyloid curli powerfully stimulates Toll-like receptor 9 (TLR9) through a two-step mechanism. First, the cross beta-sheet structure of curli is bound by cell-surface Toll-like receptor 2 (TLR2), enabling internalization of the complex into endosomes. After internalization, the curli-DNA immune complex binds strongly to endosomal TLR9, inducing production of type I IFNs. Analysis of wild-type and TLR2-deficient macrophages showed that TLR2 is the major receptor that drives the internalization of curli-DNA complexes. Suppression of TLR2 internalization via endocytosis inhibitors led to a significant decrease in Ifnβ expression. Confocal microscopy analysis confirmed that the TLR2-bound curli was required for shuttling of DNA to endosomal TLR9. Structural analysis using small-angle X-ray scattering revealed that incorporation of DNA into curli fibrils resulted in the formation of ordered curli-DNA immune complexes. Curli organizes parallel, double-stranded DNA rods at an inter-DNA spacing that matches up well with the steric size of TLR9. We also found that production of anti-double-stranded DNA autoantibodies in response to curli-DNA was attenuated in TLR2- and TLR9-deficient mice and in mice deficient in both TLR2 and TLR9 compared to wild-type mice, suggesting that both innate immune receptors are critical for shaping the autoimmune adaptive immune response. We also detected significantly lower levels of interferon-stimulated gene expression in response to purified curli-DNA in TLR2 and TLR9 deficient mice compared to wild-type mice, confirming that TLR2 and TLR9 are required for the induction of type I IFNs. Finally, we showed that curli-DNA complexes, but not cellulose, were responsible elicitation of the immune responses to bacterial biofilms. This study defines the series of events that lead to the severe pro-autoimmune effects of amyloid-expressing bacteria and suggest a mechanism by which amyloid curli acts as a carrier to break immune tolerance to DNA, leading to the activation of TLR9, production of type I IFNs, and subsequent production of autoantibodies.
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Affiliation(s)
- Sarah A. Tursi
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
| | - Ernest Y. Lee
- Department of Bioengineering, California Nano Systems Institute, University of California, Los Angeles, California, United States of America
| | - Nicole J. Medeiros
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
| | - Michael H. Lee
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
| | - Lauren K. Nicastro
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
| | - Bettina Buttaro
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
| | - Stefania Gallucci
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
| | - Ronald Paul Wilson
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
| | - Gerard C. L. Wong
- Department of Bioengineering, California Nano Systems Institute, University of California, Los Angeles, California, United States of America
- Department of Chemistry and Biochemistry, California Nano Systems Institute, University of California, Los Angeles, California, United States of America
- * E-mail: (CT); (GCLW)
| | - Çagla Tükel
- Department of Microbiology and Immunology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States of America
- * E-mail: (CT); (GCLW)
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Guo M, Wu F, Hao G, Qi Q, Li R, Li N, Wei L, Chai T. Bacillus subtilis Improves Immunity and Disease Resistance in Rabbits. Front Immunol 2017; 8:354. [PMID: 28424690 PMCID: PMC5372816 DOI: 10.3389/fimmu.2017.00354] [Citation(s) in RCA: 166] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 03/13/2017] [Indexed: 01/06/2023] Open
Abstract
Probiotics such as Lactobacillus and Bifidobacterium have been successfully used to promote growth and prevent diseases. Previous reports have demonstrated that Bacillus subtilis (B. subtilis) was a potential probiotic for animals. In this research, 180 B. subtilis were isolated from the soil, identified, and investigated in vitro. Furthermore, five B. subtilis were selected and mixed to investigate their effect on growth performance, immune response, intestine microbiota, and disease resistance in rabbits. Rabbits with a diet of 106 CFU g-1 mixed B. subtilis exhibited the best growth performance and higher serum IgG and IgA than controls (P < 0.05). Moreover, dairy with B. subtilis can promote the balance of intestinal flora. The major proinflammatory factor and β-defensin were upregulated compared with the controls. After 7 weeks of feeding, the survival rate of the rabbits fed with B. subtilis was significantly higher than those in the control groups postinfected with Escherichia coli. At the same time, this study detected higher expression of β-defensin and reduced bacteria contents of the heart and cecal contents from the diet mixed with B. subtilis compared with the control groups. In conclusion, dietary supplementation with B. subtilis for rabbits could improve growth performance, intestinal homeostasis, and immune organ index and enhance innate immune response as well as disease resistance. These findings showed that the induction of β-defensin by B. subtilis might be an interesting new therapeutic strategy to strengthen innate defense mechanisms.
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Affiliation(s)
- Mengjiao Guo
- College of Veterinary Medicine, Shandong Agricultural University, Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Tai’an City, China
- Collaborative Innovation Center for the Origin and Control of Emerging Infectious Diseases, Taishan Medical University, Tai’an City, China
| | - Fahao Wu
- College of Veterinary Medicine, Shandong Agricultural University, Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Tai’an City, China
| | - Guangen Hao
- College of Veterinary Medicine, Shandong Agricultural University, Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Tai’an City, China
| | - Qin Qi
- Tai’an City Central Hospital, Tai’an City, China
| | - Rong Li
- College of Veterinary Medicine, Shandong Agricultural University, Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Tai’an City, China
| | - Ning Li
- College of Veterinary Medicine, Shandong Agricultural University, Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Tai’an City, China
- Collaborative Innovation Center for the Origin and Control of Emerging Infectious Diseases, Taishan Medical University, Tai’an City, China
| | - Liangmeng Wei
- College of Veterinary Medicine, Shandong Agricultural University, Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Tai’an City, China
| | - Tongjie Chai
- College of Veterinary Medicine, Shandong Agricultural University, Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Tai’an City, China
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Bentham A, Burdett H, Anderson PA, Williams SJ, Kobe B. Animal NLRs provide structural insights into plant NLR function. ANNALS OF BOTANY 2017; 119:827-702. [PMID: 27562749 PMCID: PMC5378188 DOI: 10.1093/aob/mcw171] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 05/26/2016] [Accepted: 06/07/2016] [Indexed: 05/18/2023]
Abstract
BACKGROUND The plant immune system employs intracellular NLRs (nucleotide binding [NB], leucine-rich repeat [LRR]/nucleotide-binding oligomerization domain [NOD]-like receptors) to detect effector proteins secreted into the plant cell by potential pathogens. Activated plant NLRs trigger a range of immune responses, collectively known as the hypersensitive response (HR), which culminates in death of the infected cell. Plant NLRs show structural and functional resemblance to animal NLRs involved in inflammatory and innate immune responses. Therefore, knowledge of the activation and regulation of animal NLRs can help us understand the mechanism of action of plant NLRs, and vice versa. SCOPE This review provides an overview of the innate immune pathways in plants and animals, focusing on the available structural and biochemical information available for both plant and animal NLRs. We highlight the gap in knowledge between the animal and plant systems, in particular the lack of structural information for plant NLRs, with crystal structures only available for the N-terminal domains of plant NLRs and an integrated decoy domain, in contrast to the more complete structures available for animal NLRs. We assess the similarities and differences between plant and animal NLRs, and use the structural information on the animal NLR pair NAIP/NLRC4 to derive a plausible model for plant NLR activation. CONCLUSIONS Signalling by cooperative assembly formation (SCAF) appears to operate in most innate immunity pathways, including plant and animal NLRs. Our proposed model of plant NLR activation includes three key steps: (1) initially, the NLR exists in an inactive auto-inhibited state; (2) a combination of binding by activating elicitor and ATP leads to a structural rearrangement of the NLR; and (3) signalling occurs through cooperative assembly of the resistosome. Further studies, structural and biochemical in particular, will be required to provide additional evidence for the different features of this model and shed light on the many existing variations, e.g. helper NLRs and NLRs containing integrated decoys.
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Affiliation(s)
- Adam Bentham
- School of Biological Sciences, Flinders University, Adelaide, SA 5001, Australia
- School of Chemistry and Molecular Biosciences, Institute for Molecular Bioscience and Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland 4072, Australia
| | - Hayden Burdett
- School of Biological Sciences, Flinders University, Adelaide, SA 5001, Australia
| | - Peter A. Anderson
- School of Biological Sciences, Flinders University, Adelaide, SA 5001, Australia
| | - Simon J. Williams
- School of Biological Sciences, Flinders University, Adelaide, SA 5001, Australia
- School of Chemistry and Molecular Biosciences, Institute for Molecular Bioscience and Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland 4072, Australia
- Plant Sciences Division, Research School of Biology, The Australian National University, Canberra 2601, Australia
| | - Bostjan Kobe
- School of Chemistry and Molecular Biosciences, Institute for Molecular Bioscience and Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland 4072, Australia
- For correspondence. E-mail
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ZHU GUOJI, CHEN JING, TIAN JIANMEI, GE LINGQING, XING AIXIA, TANG GUANGMING. Expression of NLRC4 in children with septicaemia and mechanisms of NLRC4 in in vitro cytokine secretion. Mol Med Rep 2016; 14:509-14. [DOI: 10.3892/mmr.2016.5254] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 04/06/2016] [Indexed: 11/05/2022] Open
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Abstract
Otitis media (OM) is a common disease in young children, accounting for more office visits and surgeries than any other pediatric condition. It is associated with an estimated cost of five billion dollars annually in the USA. Moreover, chronic and recurrent middle ear (ME) disease leads to hearing loss during critical periods of language acquisition and learning leading to delays in reaching developmental milestones and risking permanent damage to the ME and inner ear in severe cases. Therefore, research to understand the disease pathogenesis and identify new therapeutics is important. Although OM is a multifactorial disease, targeting the molecular mechanisms that drive inflammation and OM resolution is critical. In this review, we discuss the current evidence suggesting that innate immune receptors and effectors play key roles in OM by mediating both the ME inflammatory responses and recovery.
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Zheng NX, Wang Y, Hu DD, Yan L, Jiang YY. The role of pattern recognition receptors in the innate recognition of Candida albicans. Virulence 2016; 6:347-61. [PMID: 25714264 DOI: 10.1080/21505594.2015.1014270] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Candida albicans is both a commensal microorganism in healthy individuals and a major fungal pathogen causing high mortality in immunocompromised patients. Yeast-hypha morphological transition is a well known virulence trait of C. albicans. Host innate immunity to C. albicans critically requires pattern recognition receptors (PRRs). In this review, we summarize the PRRs involved in the recognition of C. albicans in epithelial cells, endothelial cells, and phagocytic cells separately. We figure out the differential recognition of yeasts and hyphae, the findings on PRR-deficient mice, and the discoveries on human PRR-related single nucleotide polymorphisms (SNPs).
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Affiliation(s)
- Nan-Xin Zheng
- a Changzheng Hospital ; Second Military Medical University ; Shanghai , China
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Höfs S, Mogavero S, Hube B. Interaction of Candida albicans with host cells: virulence factors, host defense, escape strategies, and the microbiota. J Microbiol 2016; 54:149-69. [DOI: 10.1007/s12275-016-5514-0] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 11/03/2015] [Accepted: 11/07/2015] [Indexed: 12/20/2022]
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Abstract
Inflammasomes are multi-protein signaling platforms that upon activation trigger the maturation of the pro-inflammatory cytokines, interleukin-1β (IL-1β) and IL-18, and cell death. Inflammasome sensors detect microbial and host-derived molecules. Here, we review the mechanisms of inflammasome activation triggered by bacterial infection, primarily focusing on two model intracellular bacterial pathogens, Francisella novicida and Salmonella typhimurium. We discuss the complex relationship between bacterial recognition through direct and indirect detection by inflammasome sensors. We highlight regulation mechanisms that potentiate or limit inflammasome activation. We discuss the importance of caspase-1 and caspase-11 in host defense, and we examine the downstream consequences of inflammasome activation within the context of bacterial infections.
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Affiliation(s)
- Kelly M Storek
- Department of Microbiology and Immunology, Stanford University, Stanford, CA, USA
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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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Lu P, Hontecillas R, Abedi V, Kale S, Leber A, Heltzel C, Langowski M, Godfrey V, Philipson C, Tubau-Juni N, Carbo A, Girardin S, Uren A, Bassaganya-Riera J. Modeling-Enabled Characterization of Novel NLRX1 Ligands. PLoS One 2015; 10:e0145420. [PMID: 26714018 PMCID: PMC4694766 DOI: 10.1371/journal.pone.0145420] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Accepted: 12/03/2015] [Indexed: 12/11/2022] Open
Abstract
Nucleotide-binding domain and leucine-rich repeat containing (NLR) family are intracellular sentinels of cytosolic homeostasis that orchestrate immune and inflammatory responses in infectious and immune-mediated diseases. NLRX1 is a mitochondrial-associated NOD-like receptor involved in the modulation of immune and metabolic responses. This study utilizes molecular docking approaches to investigate the structure of NLRX1 and experimentally assesses binding to naturally occurring compounds from several natural product and lipid databases. Screening of compound libraries predicts targeting of NLRX1 by conjugated trienes, polyketides, prenol lipids, sterol lipids, and coenzyme A-containing fatty acids for activating the NLRX1 pathway. The ligands of NLRX1 were identified by docking punicic acid (PUA), eleostearic acid (ESA), and docosahexaenoic acid (DHA) to the C-terminal fragment of the human NLRX1 (cNLRX1). Their binding and that of positive control RNA to cNLRX1 were experimentally determined by surface plasmon resonance (SPR) spectroscopy. In addition, the ligand binding sites of cNLRX1 were predicted in silico and validated experimentally. Target mutagenesis studies demonstrate that mutation of 4 critical residues ASP677, PHE680, PHE681, and GLU684 to alanine resulted in diminished affinity of PUA, ESA, and DHA to NLRX1. Consistent with the regulatory actions of NLRX1 on the NF-κB pathway, treatment of bone marrow derived macrophages (BMDM)s with PUA and DHA suppressed NF-κB activity in a NLRX1 dependent mechanism. In addition, a series of pre-clinical efficacy studies were performed using a mouse model of dextran sodium sulfate (DSS)-induced colitis. Our findings showed that the regulatory function of PUA on colitis is NLRX1 dependent. Thus, we identified novel small molecules that bind to NLRX1 and exert anti-inflammatory actions.
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Affiliation(s)
- Pinyi Lu
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Raquel Hontecillas
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Vida Abedi
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Shiv Kale
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Andrew Leber
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Chase Heltzel
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Mark Langowski
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Victoria Godfrey
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Casandra Philipson
- BioTherapeutics, 1800 Kraft Drive, Suite 200, Blacksburg, Virginia, 24060, United States of America
| | - Nuria Tubau-Juni
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
| | - Adria Carbo
- BioTherapeutics, 1800 Kraft Drive, Suite 200, Blacksburg, Virginia, 24060, United States of America
| | - Stephen Girardin
- Laboratory of Medicine & Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Aykut Uren
- Georgetown University Medical Center, Washington, District of Columbia, 20057, United States of America
| | - Josep Bassaganya-Riera
- The Center for Modeling Immunity to Enteric Pathogens, Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- Nutritional Immunology and Molecular Medicine Laboratory (www.nimml.org), Virginia Bioinformatics Institute, Virginia Tech, Blacksburg, Virginia, 24061, United States of America
- * E-mail:
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Elvitigala DAS, Thulasitha WS, Lee J. Characterization of a nucleotide-oligomerization domain (NOD) like receptor C5 (NLRC5) subfamily member from black rockfish (Sebastes schlegelii), portraying its transcriptional responses against immune stimulants. Genes Genomics 2015. [DOI: 10.1007/s13258-015-0369-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Cheong WC, Kang HR, Yoon H, Kang SJ, Ting JPY, Song MJ. Influenza A Virus NS1 Protein Inhibits the NLRP3 Inflammasome. PLoS One 2015; 10:e0126456. [PMID: 25978411 PMCID: PMC4433236 DOI: 10.1371/journal.pone.0126456] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 04/02/2015] [Indexed: 12/23/2022] Open
Abstract
The inflammasome is a molecular platform that stimulates the activation of caspase-1 and the processing of pro-interleukin (IL)-1β and pro-IL-18 for secretion. The NOD-like receptor family, pyrin domain containing 3 (NLRP3) protein is activated by diverse molecules and pathogens, leading to the formation of the NLRP3 inflammasome. Recent studies showed that the NLRP3 inflammasome mediates innate immunity against influenza A virus (IAV) infection. In this study, we investigated the function of the IAV non-structural protein 1 (NS1) in the modulation of NLRP3 inflammasome. We found that NS1 proteins derived from both highly pathogenic and low pathogenic strains efficiently decreased secretion of IL-1β and IL-18 from THP-1 cells treated with LPS and ATP. NS1 overexpression significantly impaired the transcription of proinflammatory cytokines by inhibiting transactivation of the nuclear factor-κB (NF-κB), a major transcription activator. Furthermore, NS1 physically interacted with endogenous NLRP3 and activation of the NLRP3 inflammasome was abrogated in NS1-expressing THP-1 cells. These findings suggest that NS1 downregulates NLRP3 inflammasome activation by targeting NLRP3 as well as NF-κB, leading to a reduction in the levels of inflammatory cytokines as a viral immune evasion strategy.
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Affiliation(s)
- Woo-Chang Cheong
- Virus-Host Interactions Laboratory, Department of Biosystems and Biotechnology, Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, 136–713, Republic of Korea
| | - Hye-Ri Kang
- Virus-Host Interactions Laboratory, Department of Biosystems and Biotechnology, Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, 136–713, Republic of Korea
| | - Hyunyee Yoon
- Virus-Host Interactions Laboratory, Department of Biosystems and Biotechnology, Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, 136–713, Republic of Korea
- Laboratory of Protein Immunology, Biomedical Research Institute, Seoul National University Hospital, Seoul, 110–744, Republic of Korea
| | - Suk-Jo Kang
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, 305–701, Republic of Korea
| | - Jenny P.-Y. Ting
- Departments of Genetics, Microbiology and Immunology, Center for Translational Immunology and Inflammatory Disease Institute, Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, 27599, United States of America
| | - Moon Jung Song
- Virus-Host Interactions Laboratory, Department of Biosystems and Biotechnology, Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, 136–713, Republic of Korea
- * E-mail:
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Inflammasome activation in response to the Yersinia type III secretion system requires hyperinjection of translocon proteins YopB and YopD. mBio 2015; 6:e02095-14. [PMID: 25691590 PMCID: PMC4337566 DOI: 10.1128/mbio.02095-14] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Type III secretion systems (T3SS) translocate effector proteins into target cells in order to disrupt or modulate host cell signaling pathways and establish replicative niches. However, recognition of T3SS activity by cytosolic pattern recognition receptors (PRRs) of the nucleotide-binding domain leucine rich repeat (NLR) family, either through detection of translocated products or membrane disruption, induces assembly of multiprotein complexes known as inflammasomes. Macrophages infected with Yersinia pseudotuberculosis strains lacking all known effectors or lacking the translocation regulator YopK induce rapid activation of both the canonical NLRP3 and noncanonical caspase-11 inflammasomes. While this inflammasome activation requires a functional T3SS, the precise signal that triggers inflammasome activation in response to Yersinia T3SS activity remains unclear. Effectorless strains of Yersinia as well as ΔyopK strains translocate elevated levels of T3SS substrates into infected cells. To dissect the contribution of pore formation and translocation to inflammasome activation, we took advantage of variants of YopD and LcrH that separate these functions of the T3SS. Notably, YopD variants that abrogated translocation but not pore-forming activity failed to induce inflammasome activation. Furthermore, analysis of individual infected cells revealed that inflammasome activation at the single-cell level correlated with translocated levels of YopB and YopD themselves. Intriguingly, LcrH mutants that are fully competent for effector translocation but produce and translocate lower levels of YopB and YopD also fail to trigger inflammasome activation. Our findings therefore suggest that hypertranslocation of YopD and YopB is linked to inflammasome activation in response to the Yersinia T3SS. The innate immune response is critical to effective clearance of pathogens. Recognition of conserved virulence structures and activities by innate immune receptors such as NLRs constitute one of the first steps in mounting the innate immune response. However, pathogens such as Yersinia actively evade or subvert components of host defense, such as inflammasomes. The T3SS-secreted protein YopK is an essential virulence factor that limits translocation of other Yops, thereby limiting T3SS-induced inflammasome activation. However, what triggers inflammasome activation in cells infected by YopK-deficient Yersinia is not clear. Our findings indicate that hypertranslocation of pore complex proteins promotes inflammasome activation and that YopK prevents inflammasome activation by the T3SS by limiting translocation of YopD and YopB themselves.
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Toll-like receptor 2 and NLRP3 cooperate to recognize a functional bacterial amyloid, curli. Infect Immun 2014; 83:693-701. [PMID: 25422268 DOI: 10.1128/iai.02370-14] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Amyloids are proteins with cross-β-sheet structure that contribute to pathology and inflammation in complex human diseases, including Alzheimer's disease, Parkinson's disease, type II diabetes, and secondary amyloidosis. Bacteria also produce amyloids as a component of their extracellular matrix during biofilm formation. Recently, several human amyloids were shown to activate the NLRP3 inflammasome, leading to the activation of caspase 1 and production of interleukin 1β (IL-1β). In this study, we investigated the activation of the NLRP3 inflammasome by bacterial amyloids using curli fibers, produced by Salmonella enterica serovar Typhimurium and Escherichia coli. Here, we show that curli fibers activate the NLRP3 inflammasome, leading to the production of IL-1β via caspase 1 activation. Investigation of the underlying mechanism revealed that activation of Toll-like receptor 2 (TLR2) by curli fibers is critical in the generation of IL-1β. Interestingly, activation of the NLRP3 inflammasome by curli fibers or by amyloid β of Alzheimer's disease does not cause cell death in macrophages. Overall, these data identify a cross talk between TLR2 and NLRP3 in response to the bacterial amyloid curli and generation of IL-1β as a product of this interaction.
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Wang L, Hartmann P, Haimerl M, Bathena SP, Sjöwall C, Almer S, Alnouti Y, Hofmann AF, Schnabl B. Nod2 deficiency protects mice from cholestatic liver disease by increasing renal excretion of bile acids. J Hepatol 2014; 60:1259-67. [PMID: 24560660 PMCID: PMC4028388 DOI: 10.1016/j.jhep.2014.02.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 01/16/2014] [Accepted: 02/06/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND & AIMS Chronic liver disease is characterized by fibrosis that may progress to cirrhosis. Nucleotide oligomerization domain 2 (Nod2), a member of the Nod-like receptor (NLR) family of intracellular immune receptors, plays an important role in the defense against bacterial infection through binding to the ligand muramyl dipeptide (MDP). Here, we investigated the role of Nod2 in the development of liver fibrosis. METHODS We studied experimental cholestatic liver disease induced by bile duct ligation or toxic liver disease induced by carbon tetrachloride in wild type and Nod2(-/-) mice. RESULTS Nod2 deficiency protected mice from cholestatic but not toxin-induced liver injury and fibrosis. Most notably, the hepatic bile acid concentration was lower in Nod2(-/-) mice than wild type mice following bile duct ligation for 3 weeks. In contrast to wild type mice, Nod2(-/-) mice had increased urinary excretion of bile acids, including sulfated bile acids, and an upregulation of the bile acid efflux transporters MRP2 and MRP4 in tubular epithelial cells of the kidney. MRP2 and MRP4 were downregulated by IL-1β in a Nod2 dependent fashion. CONCLUSIONS Our findings indicate that Nod2 deficiency protects mice from cholestatic liver injury and fibrosis through enhancing renal excretion of bile acids that in turn contributes to decreased concentration of bile acids in the hepatocyte.
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Affiliation(s)
- Lirui Wang
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Phillipp Hartmann
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Michael Haimerl
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Sai P. Bathena
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE
| | - Christopher Sjöwall
- Rheumatology/AIR, Department of Clinical and Experimental Medicine, Linköping University, Sweden
| | - Sven Almer
- Karolinska Institute, Division of Gastroenterology and Karolinska University Hospital, GastroCentrum, Stockholm, Sweden
| | - Yazen Alnouti
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE
| | - Alan F. Hofmann
- Department of Medicine, University of California San Diego, La Jolla, CA
| | - Bernd Schnabl
- Department of Medicine, University of California San Diego, La Jolla, CA, USA.
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Schenten D, Nish SA, Yu S, Yan X, Lee HK, Brodsky I, Pasman L, Yordy B, Wunderlich FT, Brüning JC, Zhao H, Medzhitov R. Signaling through the adaptor molecule MyD88 in CD4+ T cells is required to overcome suppression by regulatory T cells. Immunity 2014; 40:78-90. [PMID: 24439266 DOI: 10.1016/j.immuni.2013.10.023] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Accepted: 10/30/2013] [Indexed: 10/25/2022]
Abstract
Innate immune recognition controls adaptive immune responses through multiple mechanisms. The MyD88 signaling adaptor operates in many cell types downstream of Toll-like receptors (TLRs) and interleukin-1 (IL-1) receptor family members. Cell-type-specific functions of MyD88 signaling remain poorly characterized. Here, we have shown that the T cell-specific ablation of MyD88 in mice impairs not only T helper 17 (Th17) cell responses, but also Th1 cell responses. MyD88 relayed signals of TLR-induced IL-1, which became dispensable for Th1 cell responses in the absence of T regulatory (Treg) cells. Treg cell-specific ablation of MyD88 had no effect, suggesting that IL-1 acts on naive CD4(+) T cells instead of Treg cells themselves. Together, these findings demonstrate that IL-1 renders naive CD4(+) T cells refractory to Treg cell-mediated suppression in order to allow their differentiation into Th1 cells. In addition, IL-1 was also important for the generation of functional CD4(+) memory T cells.
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Affiliation(s)
- Dominik Schenten
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA; Howard Hughes Medical Institute, School of Medicine, Yale University, New Haven, CT 06519, USA.
| | - Simone A Nish
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA; Howard Hughes Medical Institute, School of Medicine, Yale University, New Haven, CT 06519, USA
| | - Shuang Yu
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA; Howard Hughes Medical Institute, School of Medicine, Yale University, New Haven, CT 06519, USA
| | - Xiting Yan
- Department of Biostatistics, Yale School of Public Health, New Haven, CT 06520, USA
| | - Heung Kyu Lee
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA; Howard Hughes Medical Institute, School of Medicine, Yale University, New Haven, CT 06519, USA
| | - Igor Brodsky
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA; Howard Hughes Medical Institute, School of Medicine, Yale University, New Haven, CT 06519, USA
| | - Lesley Pasman
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA; Howard Hughes Medical Institute, School of Medicine, Yale University, New Haven, CT 06519, USA
| | - Brian Yordy
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA
| | - F Thomas Wunderlich
- Max Planck Institute for Neurological Research, Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) and Center of Molecular Medicine Cologne (CMMC), Center for Endocrinology, Diabetes and Preventive Medicine (CEDP), Institute for Genetics, University of Cologne, 50931 Cologne, Germany
| | - Jens C Brüning
- Max Planck Institute for Neurological Research, Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) and Center of Molecular Medicine Cologne (CMMC), Center for Endocrinology, Diabetes and Preventive Medicine (CEDP), Institute for Genetics, University of Cologne, 50931 Cologne, Germany
| | - Hongyu Zhao
- Department of Biostatistics, Yale School of Public Health, New Haven, CT 06520, USA
| | - Ruslan Medzhitov
- Department of Immunobiology, Yale University, New Haven, CT 06519, USA; Howard Hughes Medical Institute, School of Medicine, Yale University, New Haven, CT 06519, USA.
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Li J, Wu S, Wang MR, Wang TT, Li BK, Zhu JM. Potential roles of nucleotide-binding oligomerization domain 2 in the pathogenesis of systemic lupus erythematosus. Rheumatol Int 2014; 34:1339-44. [PMID: 24599604 DOI: 10.1007/s00296-014-2975-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 02/17/2014] [Indexed: 01/09/2023]
Abstract
Nucleotide-binding oligomerization domain 2 (NOD2) is one of the most prominent member of the NOD-like receptors protein family that functions as intracellular pattern recognition receptors. Numerous studies have suggested the importance of NOD2 in defensing against microbial infections, regulation of the inflammatory process. It is shown that NOD2 contributes to the pathogenesis of various autoimmune and chronic inflammatory diseases, such as Crohn's disease, rheumatoid arthritis. The aim of this study is to summarize our current understandings of NOD2 function and the role of NOD2 in systemic lupus erythematosus (SLE). The following databases were searched: Pubmed, EMBASE and Web of Science for English-language sources, using the terms "lupus," "systemic lupus erythematosus," ''SLE," "immunity," "inflammatory" and "NOD2." Emerging data evidences that NOD2 has important biological effects in autoimmunity and inflammatory and might take part in the pathogenesis of SLE. Studies exploring the relationship between NOD2 and SLE are very limited. Whether NOD2 could be a potentially valuable therapeutic target for treatment for SLE, more understanding of the mechanism of NOD2 is needed in the future in SLE.
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Affiliation(s)
- Jing Li
- Department of Public Health and General Medicine, School of Integrated Traditional and Western Medicine, Anhui University of Chinese Medicine, Hefei, 230038, Anhui, China
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Ayala G, Escobedo-Hinojosa WI, Cruz-Herrera CFDL, Romero I. Exploring alternative treatments for Helicobacter pylori infection. World J Gastroenterol 2014; 20:1450-1469. [PMID: 24587621 PMCID: PMC3925854 DOI: 10.3748/wjg.v20.i6.1450] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 12/21/2013] [Accepted: 01/05/2014] [Indexed: 02/06/2023] Open
Abstract
Helicobacter pylori (H. pylori) is a successful pathogen that can persist in the stomach of an infected person for their entire life. It provokes chronic gastric inflammation that leads to the development of serious gastric diseases such as peptic ulcers, gastric cancer and Mucosa associated lymphoid tissue lymphoma. It is known that these ailments can be avoided if the infection by the bacteria can be prevented or eradicated. Currently, numerous antibiotic-based therapies are available. However, these therapies have several inherent problems, including the appearance of resistance to the antibiotics used and associated adverse effects, the risk of re-infection and the high cost of antibiotic therapy. The delay in developing a vaccine to prevent or eradicate the infection has furthered research into new therapeutic approaches. This review summarises the most relevant recent studies on vaccine development and new treatments using natural resources such as plants, probiotics and nutraceuticals. In addition, novel alternatives based on microorganisms, peptides, polysaccharides, and intragastric violet light irradiation are presented. Alternative therapies have not been effective in eradicating the bacteria but have been shown to maintain low bacterial levels. Nevertheless, some of them are useful in preventing the adverse effects of antibiotics, modulating the immune response, gastroprotection, and the general promotion of health. Therefore, those agents can be used as adjuvants of allopathic anti-H. pylori eradication therapy.
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Liu S, Li Q, Liu Y. Immunohistochemical localization of NALP3 inflammasome in experimental periapical lesions. Int Endod J 2014; 47:949-57. [PMID: 24386947 DOI: 10.1111/iej.12240] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 01/01/2014] [Indexed: 02/07/2023]
Abstract
AIM To explore the role of NALP3 inflammasome [NALP3, its effector molecule apoptosis associated speck-like protein (ASC), caspase-1, interleukin (IL)-1β and IL-18] in the development of periapical lesions in rats. METHODOLOGY Periapical lesions were developed within 21 days after mandibular first molar pulp exposure in Sprague-Dawley rats. The animals were randomly sacrificed at 0, 1, 3, 7, 10, 14 and 21 days after pulpal exposure. The bilateral mandibles were extracted for histological processing, then they were haematoxylin-eosin (HE) stained to examine inflammation infiltration in the apical region and immunohistochemically examined for the NALP3 inflammasome signalling pathway. Data were analysed by one-way analysis of variance and the Pearson(') s correlation and linear tendency test. RESULTS NALP3 was detected in the cytoplasm of fibroblasts, monocytes, neutrophils, macrophages and vascular endothelial cells in the periapical region. From day 1 to day 21, the number of NALP3-positive cells ascended and was significantly correlated with the intensity of inflammatory infiltration (r = 0.776, P < 0.01). ASC, caspase-1, IL-1β and IL-18 were all expressed in the inflammatory periapical tissues. The positive cell counts of IL-1β and IL-18 were significantly correlated with that of NALP3, and r = 0.718, P < 0.01; r = 0.688, P < 0.01, respectively. CONCLUSIONS NALP3 inflammasome is expressed in the inflammatory periapical tissues. This cytokine-signalling pathway may therefore be crucial in the regulatory control of inflammatory responses in periapical tissues and the development of periapical lesions.
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Affiliation(s)
- S Liu
- Department of Conservative Dentistry and Endodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
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Cole JE, Mitra AT, Monaco C. Treating atherosclerosis: the potential of Toll-like receptors as therapeutic targets. Expert Rev Cardiovasc Ther 2014; 8:1619-35. [DOI: 10.1586/erc.10.149] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Phosphorylation of the adaptor ASC acts as a molecular switch that controls the formation of speck-like aggregates and inflammasome activity. Nat Immunol 2013; 14:1247-55. [PMID: 24185614 PMCID: PMC4813763 DOI: 10.1038/ni.2749] [Citation(s) in RCA: 281] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Accepted: 09/27/2013] [Indexed: 12/11/2022]
Abstract
The inflammasome adaptor ASC contributes to innate immunity through the activation of caspase-1. Here we show that Syk and JNK-dependent signaling pathways are required for caspase-1 activation via the ASC-dependent inflammasomes NLRP3 and AIM2. Inhibition of Syk or JNK abolished the formation of ASC specks without affecting interaction of ASC with NLRP3. ASC was phosphorylated during inflammasome activation in a Syk- and JNK-dependent manner, suggesting that Syk and JNK are upstream of ASC phosphorylation. Moreover, phosphorylation of Tyr144 residue in mouse ASC was critical for speck formation and caspase-1 activation. These results suggested that phosphorylation of ASC controls inflammasome activity through ASC speck formation.
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Briken V, Ahlbrand SE, Shah S. Mycobacterium tuberculosis and the host cell inflammasome: a complex relationship. Front Cell Infect Microbiol 2013; 3:62. [PMID: 24130966 PMCID: PMC3793174 DOI: 10.3389/fcimb.2013.00062] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Accepted: 09/23/2013] [Indexed: 12/31/2022] Open
Abstract
The production of IL-1β during the infection with Mycobacterium tuberculosis (Mtb) is important for successful host immune defense. In macrophages and dendritic cells the host cell inflammasome is crucial for generation of secreted IL-1β in response to Mtb infections. In these cell types Mtb infection only activates the NLRP3-inflammasome. New reports demonstrate that nitric oxide has an important function in the negative regulation of the NLRP3-inflammasome to reduce tissue damage during Mtb infections. The type I interferon, IFN-β, is induced after Mtb infections and can also suppress NLRP3-inflammasome activation. In contrast, IFN-β increases activity of the AIM2-inflammasome after infection with intracellular pathogens such as Francisella tularensis and Listeria monocytogenes. Recent results demonstrate that non-tuberculous mycobacteria but not virulent Mtb induce the AIM2-inflammasome in an IFN-β dependent matter. Indeed, Mtb inhibits AIM2-inflammasome activation via its ESX-1 secretion system. This novel immune evasion mechanism may help Mtb to allow the induction of low levels of IFN-β to suppress the NLRP3-inflammasome without activating the AIM2-inflammasome.
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Affiliation(s)
- Volker Briken
- Department of Cell Biology and Molecular Genetics, University of Maryland College Park, MD, USA
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