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Nasuhidehnavi A, Yap GS. To kill a tachyzoite: assault and battery. Trends Parasitol 2024:S1471-4922(24)00117-X. [PMID: 38762372 DOI: 10.1016/j.pt.2024.05.002] [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: 05/02/2024] [Accepted: 05/03/2024] [Indexed: 05/20/2024]
Abstract
Polymeric guanylate-binding proteins (GBPs) physically dismember the vacuole membrane formed by Toxoplasma gondii while nitric oxide (NO) poisons and inhibits parasite replication within interferon (IFN)-γ activated macrophages. Zhao et al. report a novel mechanism for synergy between these classical microbicidal and microbistatic effectors in cell-autonomous immunity to the intracellular parasites.
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Affiliation(s)
- Azadeh Nasuhidehnavi
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
| | - George S Yap
- Center for Immunity and Inflammation, Department of Medicine, New Jersey Medical School, Rutgers University, Newark, NJ, USA.
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2
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Rico-San Román L, Amieva R, Horcajo P, García-Sánchez M, Pastor-Fernández I, Ortega-Mora LM, Collantes-Fernández E. Characterization of Neospora caninum virulence factors NcGRA7 and NcROP40 in bovine target cells. Vet Parasitol 2023; 320:109973. [PMID: 37356132 DOI: 10.1016/j.vetpar.2023.109973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/24/2023] [Accepted: 06/12/2023] [Indexed: 06/27/2023]
Abstract
Bovine neosporosis is one of the major causes of reproductive failure in cattle worldwide, and differences in virulence between isolates have been widely shown. However, the molecular basis and mechanisms underlying virulence in Neospora caninum are mostly unknown. Recently, we demonstrated the involvement of NcGRA7 and NcROP40 in the virulence of N. caninum in a pregnant murine model using single knockout mutants in these genes generated by CRISR/Cas9 technology. In this study, the role of these proteins was investigated in two in vitro models using bovine target cells: trophoblast (F3 cell line) and monocyte-derived macrophages (BoMØ). The proliferation capacity of the single knockout mutant parasites was compared to the wild-type strain, the Nc-Spain7 isolate, using both cell populations. For the bovine trophoblast, no differences were observed in the growth of the defective parasites compared to the wild-type strain, neither in the proliferation kinetics nor in the competition assay. However, in naïve BoMØ, a significant decrease in the proliferation capacity of the mutant parasites was observed from 48 h pi onwards. Stimulation of BoMØ with IFN-γ showed a similar inhibition of tachyzoite growth in defective and wild-type strains in a dose-dependent manner. Finally, BoMØ infected with knockout parasites showed higher expression levels of TLR3, which is involved in pathogen recognition. These results suggest that NcGRA7 and NcROP40 may be involved in the manipulation of innate immune defense mechanisms against neosporosis and confirm the usefulness of the BoMØ model for the evaluation of N. caninum virulence mechanisms. However, the specific functions of these proteins remain unknown, opening the way for future research.
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Affiliation(s)
- Laura Rico-San Román
- SALUVET, Animal Health Department, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Rafael Amieva
- SALUVET, Animal Health Department, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Pilar Horcajo
- SALUVET, Animal Health Department, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.
| | - Marta García-Sánchez
- SALUVET-Innova S.L., Faculty of Veterinary Sciences, Complutense University of Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Iván Pastor-Fernández
- SALUVET, Animal Health Department, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Luis Miguel Ortega-Mora
- SALUVET, Animal Health Department, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Esther Collantes-Fernández
- SALUVET, Animal Health Department, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
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3
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Ohara RA, Murphy KM. The evolving biology of cross-presentation. Semin Immunol 2023; 66:101711. [PMID: 36645993 PMCID: PMC10931539 DOI: 10.1016/j.smim.2023.101711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 12/16/2022] [Accepted: 01/07/2023] [Indexed: 01/15/2023]
Abstract
Cross-priming was first recognized in the context of in vivo cytotoxic T lymphocyte (CTL) responses generated against minor histocompatibility antigens induced by immunization with lymphoid cells. Even though the basis for T cell antigen recognition was still largely unclear at that time, these early studies recognized the implication that such minor histocompatibility antigens were derived from the immunizing cells and were obtained exogenously by the host's antigen presenting cells (APCs) that directly prime the CTL response. As antigen recognition by the T cell receptor became understood to involve peptides derived from antigens processed by the APCs and presented by major histocompatibility molecules, the "cross-priming" phenomenon was subsequently recast as "cross-presentation" and the scope considered for examining this process gradually broadened to include many different forms of antigens, including soluble proteins, and different types of APCs that may not be involved in in vivo CTL priming. Many studies of cross-presentation have relied on in vitro cell models that were recently found to differ from in vivo APCs in particular mechanistic details. A recent trend has focused on the APCs and pathways of cross-presentation used in vivo, especially the type 1 dendritic cells. Current efforts are also being directed towards validating the in vivo role of various putative pathways and gene candidates in cross-presentation garnered from various in vitro studies and to determine the relative contributions they make to CTL responses across various forms of antigens and immunologic settings. Thus, cross-presentation appears to be carried by different pathways in various types of cells for different forms under different physiologic settings, which remain to be evaluated in an in vivo physiologic setting.
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Affiliation(s)
- Ray A Ohara
- Department of Pathology and Immunology, Washington University in St. Louis, School of Medicine, St. Louis, MO 63110, USA
| | - Kenneth M Murphy
- Department of Pathology and Immunology, Washington University in St. Louis, School of Medicine, St. Louis, MO 63110, USA.
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4
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Wilburn KM, Meade RK, Heckenberg EM, Dockterman J, Coers J, Sassetti CM, Olive AJ, Smith CM. Differential Requirement for IRGM Proteins during Tuberculosis Infection in Mice. Infect Immun 2023; 91:e0051022. [PMID: 36629440 PMCID: PMC9933630 DOI: 10.1128/iai.00510-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 12/16/2022] [Indexed: 01/12/2023] Open
Abstract
Mycobacterium tuberculosis (Mtb) is a bacterium that exclusively resides in human hosts and remains a dominant cause of morbidity and mortality among infectious diseases worldwide. Host protection against Mtb infection is dependent on the function of immunity-related GTPase clade M (IRGM) proteins. Polymorphisms in human IRGM associate with altered susceptibility to mycobacterial disease, and human IRGM promotes the delivery of Mtb into degradative autolysosomes. Among the three murine IRGM orthologs, Irgm1 has been singled out as essential for host protection during Mtb infections in cultured macrophages and in vivo. However, whether the paralogous murine Irgm genes, Irgm2 and Irgm3, play roles in host defense against Mtb or exhibit functional relationships with Irgm1 during Mtb infection remains undetermined. Here, we report that Irgm1-/- mice are indeed acutely susceptible to aerosol infection with Mtb, yet the additional deletion of the paralogous Irgm3 gene restores protective immunity to Mtb infections in Irgm1-deficient animals. Mice lacking all three Irgm genes (panIrgm-/-) are characterized by shifted lung cytokine profiles at 5 and 24 weeks postinfection, but control disease until the very late stages of the infection, when panIrgm-/- mice display increased mortality compared to wild-type mice. Collectively, our data demonstrate that disruptions in the balance between Irgm isoforms is more detrimental to the Mtb-infected host than total loss of Irgm-mediated host defense, a concept that also needs to be considered in the context of human Mtb susceptibility linked to IRGM polymorphisms.
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Affiliation(s)
- Kaley M. Wilburn
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Rachel K. Meade
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
- University Program in Genetics and Genomics, Duke University, Durham, North Carolina, USA
| | - Emma M. Heckenberg
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Jacob Dockterman
- Department of Immunology, Duke University Medical Center, Durham, North Carolina, USA
| | - Jörn Coers
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
- University Program in Genetics and Genomics, Duke University, Durham, North Carolina, USA
- Department of Immunology, Duke University Medical Center, Durham, North Carolina, USA
| | - Christopher M. Sassetti
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts, USA
| | - Andrew J. Olive
- Department of Microbiology and Molecular Genetics, College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan, USA
| | - Clare M. Smith
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
- University Program in Genetics and Genomics, Duke University, Durham, North Carolina, USA
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA
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5
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Pant A, Yao X, Lavedrine A, Viret C, Dockterman J, Chauhan S, Chong-Shan Shi, Manjithaya R, Cadwell K, Kufer TA, Kehrl JH, Coers J, Sibley LD, Faure M, Taylor GA, Chauhan S. Interactions of Autophagy and the Immune System in Health and Diseases. AUTOPHAGY REPORTS 2022; 1:438-515. [PMID: 37425656 PMCID: PMC10327624 DOI: 10.1080/27694127.2022.2119743] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Autophagy is a highly conserved process that utilizes lysosomes to selectively degrade a variety of intracellular cargo, thus providing quality control over cellular components and maintaining cellular regulatory functions. Autophagy is triggered by multiple stimuli ranging from nutrient starvation to microbial infection. Autophagy extensively shapes and modulates the inflammatory response, the concerted action of immune cells, and secreted mediators aimed to eradicate a microbial infection or to heal sterile tissue damage. Here, we first review how autophagy affects innate immune signaling, cell-autonomous immune defense, and adaptive immunity. Then, we discuss the role of non-canonical autophagy in microbial infections and inflammation. Finally, we review how crosstalk between autophagy and inflammation influences infectious, metabolic, and autoimmune disorders.
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Affiliation(s)
- Aarti Pant
- Autophagy Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India
| | - Xiaomin Yao
- Kimmel Center for Biology and Medicine at the Skirball Institute, New York University Grossman School of Medicine, New York, New York, United States of America
- Department of Microbiology, New York University Grossman School of Medicine, New York, New York, United States of America
| | - Aude Lavedrine
- CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, F-69007, Lyon, France
- Equipe Labellisée par la Fondation pour la Recherche Médicale, FRM
| | - Christophe Viret
- CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, F-69007, Lyon, France
- Equipe Labellisée par la Fondation pour la Recherche Médicale, FRM
| | - Jake Dockterman
- Department of Immunology, Duke University, Medical Center, Durham, North Carolina, USA
| | - Swati Chauhan
- Cell biology and Infectious diseases, Institute of Life Sciences, Bhubaneswar, India
| | - Chong-Shan Shi
- Laboratory of Immunoregulation, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Ravi Manjithaya
- Autophagy Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India
- Neuroscience Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India
| | - Ken Cadwell
- Kimmel Center for Biology and Medicine at the Skirball Institute, New York University Grossman School of Medicine, New York, New York, United States of America
- Department of Microbiology, New York University Grossman School of Medicine, New York, New York, United States of America
- Division of Gastroenterology and Hepatology, Department of Medicine, New York University Grossman School of Medicine, New York, New York, United States of America
| | - Thomas A. Kufer
- Department of Immunology, Institute of Nutritional Medicine, University of Hohenheim, Stuttgart, Germany
| | - John H. Kehrl
- Laboratory of Immunoregulation, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Jörn Coers
- Department of Immunology, Duke University, Medical Center, Durham, North Carolina, USA
- Department of Molecular Genetics and Microbiology, Duke University, Medical Center, Durham, North Carolina, USA
| | - L. David Sibley
- Department of Molecular Microbiology, Washington University Sch. Med., St Louis, MO, 63110, USA
| | - Mathias Faure
- CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, F-69007, Lyon, France
- Equipe Labellisée par la Fondation pour la Recherche Médicale, FRM
| | - Gregory A Taylor
- Department of Immunology, Duke University, Medical Center, Durham, North Carolina, USA
- Department of Molecular Genetics and Microbiology, Duke University, Medical Center, Durham, North Carolina, USA
- Department of Molecular Microbiology, Washington University Sch. Med., St Louis, MO, 63110, USA
- Geriatric Research, Education, and Clinical Center, VA Health Care Center, Durham, North Carolina, USA
- Departments of Medicine, Division of Geriatrics, and Center for the Study of Aging and Human Development, Duke University, Medical Center, Durham, North Carolina, USA
| | - Santosh Chauhan
- Cell biology and Infectious diseases, Institute of Life Sciences, Bhubaneswar, India
- CSIR–Centre For Cellular And Molecular Biology (CCMB), Hyderabad, Telangana
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6
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Sardinha-Silva A, Alves-Ferreira EVC, Grigg ME. Intestinal immune responses to commensal and pathogenic protozoa. Front Immunol 2022; 13:963723. [PMID: 36211380 PMCID: PMC9533738 DOI: 10.3389/fimmu.2022.963723] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 08/15/2022] [Indexed: 11/17/2022] Open
Abstract
The physical barrier of the intestine and associated mucosal immunity maintains a delicate homeostatic balance between the host and the external environment by regulating immune responses to commensals, as well as functioning as the first line of defense against pathogenic microorganisms. Understanding the orchestration and characteristics of the intestinal mucosal immune response during commensal or pathological conditions may provide novel insights into the mechanisms underlying microbe-induced immunological tolerance, protection, and/or pathogenesis. Over the last decade, our knowledge about the interface between the host intestinal mucosa and the gut microbiome has been dominated by studies focused on bacterial communities, helminth parasites, and intestinal viruses. In contrast, specifically how commensal and pathogenic protozoa regulate intestinal immunity is less well studied. In this review, we provide an overview of mucosal immune responses induced by intestinal protozoa, with a major focus on the role of different cell types and immune mediators triggered by commensal (Blastocystis spp. and Tritrichomonas spp.) and pathogenic (Toxoplasma gondii, Giardia intestinalis, Cryptosporidium parvum) protozoa. We will discuss how these various protozoa modulate innate and adaptive immune responses induced in experimental models of infection that benefit or harm the host.
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7
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Kaneda Y, Miyata H, Shimada K, Oyama Y, Iida-Norita R, Ikawa M. IRGC1, a testis-enriched immunity related GTPase, is important for fibrous sheath integrity and sperm motility in mice. Dev Biol 2022; 488:104-113. [PMID: 35618043 PMCID: PMC9232189 DOI: 10.1016/j.ydbio.2022.05.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 05/02/2022] [Accepted: 05/18/2022] [Indexed: 11/22/2022]
Abstract
Immunity-related GTPases (IRGs), also known as p47 GTPases, are a family of interferon-inducible proteins that play roles in immunity defense against intracellular pathogens. Although the molecular functions of IRGs have been well studied, the function of the family member, IRGC1, remains unclear. IRGC1 is unique among IRGs because its expression is not induced by interferon and it is expressed predominantly in the testis. Further, IRGC1 is well conserved in mammals unlike other IRGs. Here, we knocked out (KO) Irgc1 in mice using the CRISPR/Cas9 system and found that the fertility of Irgc1 KO males was severely impaired because of abnormal sperm motility. Further analyses with a transmission electron microscope revealed that the fibrous sheath (FS), an accessory structure of the sperm tail, was disorganized in Irgc1 KO mice. In addition, IRGC1 was detected in the sperm tail and fractionated with FS proteins. These results suggest that IRGC1 is a component of the FS and is involved in the correct formation of the FS.
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Affiliation(s)
- Yuki Kaneda
- Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 5650871, Japan; Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, 5650871, Japan.
| | - Haruhiko Miyata
- Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 5650871, Japan.
| | - Keisuke Shimada
- Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 5650871, Japan.
| | - Yuki Oyama
- Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 5650871, Japan; Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, 5650871, Japan.
| | - Rie Iida-Norita
- Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 5650871, Japan.
| | - Masahito Ikawa
- Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 5650871, Japan; Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, 5650871, Japan; The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 1088639, Japan; Center for Infectious Disease Education and Research, Osaka University, 2-8 Yamadaoka, Suita, Osaka, 5650871, Japan.
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8
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Skariah S, Sultan AA, Mordue DG. IFN-induced cell-autonomous immune mechanisms in the control of intracellular protozoa. Parasitol Res 2022; 121:1559-1571. [DOI: 10.1007/s00436-022-07514-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 04/04/2022] [Indexed: 10/18/2022]
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9
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Xia Z, Xu J, Lu E, He W, Deng S, Gong AY, Strass-Soukup J, Martins GA, Lu G, Chen XM. m 6A mRNA Methylation Regulates Epithelial Innate Antimicrobial Defense Against Cryptosporidial Infection. Front Immunol 2021; 12:705232. [PMID: 34295340 PMCID: PMC8291979 DOI: 10.3389/fimmu.2021.705232] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 06/22/2021] [Indexed: 12/28/2022] Open
Abstract
Increasing evidence supports that N6-methyladenosine (m6A) mRNA modification may play an important role in regulating immune responses. Intestinal epithelial cells orchestrate gastrointestinal mucosal innate defense to microbial infection, but underlying mechanisms are still not fully understood. In this study, we present data demonstrating significant alterations in the topology of host m6A mRNA methylome in intestinal epithelial cells following infection by Cryptosporidium parvum, a coccidian parasite that infects the gastrointestinal epithelium and causes a self-limited disease in immunocompetent individuals but a life-threatening diarrheal disease in AIDS patients. Altered m6A methylation in mRNAs in intestinal epithelial cells following C. parvum infection is associated with downregulation of alpha-ketoglutarate-dependent dioxygenase alkB homolog 5 and the fat mass and obesity-associated protein with the involvement of NF-кB signaling. Functionally, m6A methylation statuses influence intestinal epithelial innate defense against C. parvum infection. Specifically, expression levels of immune-related genes, such as the immunity-related GTPase family M member 2 and interferon gamma induced GTPase, are increased in infected cells with a decreased m6A mRNA methylation. Our data support that intestinal epithelial cells display significant alterations in the topology of their m6A mRNA methylome in response to C. parvum infection with the involvement of activation of the NF-кB signaling pathway, a process that modulates expression of specific immune-related genes and contributes to fine regulation of epithelial antimicrobial defense.
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Affiliation(s)
- Zijie Xia
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE, United States
| | - Jihao Xu
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE, United States
| | - Eugene Lu
- Department of Biology, School of Interdisciplinary Informatics, University of Nebraska at Omaha, Omaha, NE, United States
| | - Wei He
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE, United States
| | - Silu Deng
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE, United States.,Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, IL, United States
| | - Ai-Yu Gong
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE, United States.,Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, IL, United States
| | - Juliane Strass-Soukup
- Department of Chemistry, Creighton University College of Arts & Sciences, Omaha, NE, United States
| | - Gislaine A Martins
- Department of Medicine and Biomedical Sciences, Research Division of Immunology Cedars-Sinai Medical Center, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Guoqing Lu
- Department of Biology, School of Interdisciplinary Informatics, University of Nebraska at Omaha, Omaha, NE, United States
| | - Xian-Ming Chen
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE, United States.,Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, IL, United States
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10
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Damasceno-Sá JC, de Souza FS, Dos Santos TAT, de Oliveira FC, da Silva MDFS, Dias RRF, de Souza W, Arnholdt ACV, Seabra SH, DaMatta RA. Inhibition of nitric oxide production of activated mice peritoneal macrophages is independent of the Toxoplasma gondii strain. Mem Inst Oswaldo Cruz 2021; 116:e200417. [PMID: 33729328 PMCID: PMC7949196 DOI: 10.1590/0074-02760200417] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Accepted: 02/09/2021] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Toxoplasma gondii causes toxoplasmosis and is controlled by activated macrophages. However, infection of macrophages by tachyzoites induces TGF-β signaling (TGF-s) inhibiting nitric oxide (NO) production. NO inhibition may be a general escape mechanism of distinct T. gondii strains. OBJECTIVES To evaluate in activated macrophages the capacity of T. gondii strains of different virulence and genetics (RH, type I; ME-49, type II; VEG, type III; P-Br, recombinant) to evade the NO microbicidal defense system and determine LC3 loading to the parasitophorous vacuole. METHODS Activated peritoneal macrophages were infected with the different T. gondii strains, NO-production was evaluated by the Griess reagent, and inducible nitric oxide synthase expression, TGF-s, and LC3 localisation assayed by immunofluorescence. FINDINGS Only RH persisted in macrophages, while VEG was more resistant than P-Br and ME-49. All strains induced TGF-s, degradation of inducible nitric oxide synthase, and NO-production inhibition from 2 to 24 h of infection, but only RH sustained these alterations for 48 h. By 24 h of infection, TGF-s lowered in macrophages infected by ME-49, and P-Br, and NO-production recovered, while VEG sustained TGF-s and NO-production inhibition longer. LC3 loading to parasitophorous vacuole was strain-dependent: higher for ME-49, P-Br and VEG, lower for RH. All strains inhibited NO-production, but only RH sustained this effect probably because it persisted in macrophages due to additional evasive mechanisms as lower LC3 loading to parasitophorous vacuole. MAIN CONCLUSIONS These results support that T. gondii can escape the NO microbicidal defense system at the initial phase of the infection, but only the virulent strain sustain this evasion mechanism.
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Affiliation(s)
- João Cláudio Damasceno-Sá
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil
| | - Fernanda Silva de Souza
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil
| | - Thiago Alves Teixeira Dos Santos
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil.,Centro Universitário Estadual da Zona Oeste, Colegiado de Ciências Biológicas e da Saúde, Laboratório de Tecnologia em Bioquímica e Microscopia, Rio de Janeiro, RJ, Brasil
| | - Fábio Conceição de Oliveira
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil
| | - Maria de Fátima Sarro da Silva
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil
| | - Raul Ramos Furtado Dias
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil
| | - Wanderley de Souza
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho, Laboratório de Ultraestrutura Celular Hertha Meyer, Rio de Janeiro, RJ, Brasil
| | - Andrea Cristina Veto Arnholdt
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia do Reconhecer, Campos dos Goytacazes, RJ, Brasil
| | - Sergio Henrique Seabra
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil.,Centro Universitário Estadual da Zona Oeste, Colegiado de Ciências Biológicas e da Saúde, Laboratório de Tecnologia em Bioquímica e Microscopia, Rio de Janeiro, RJ, Brasil
| | - Renato Augusto DaMatta
- Universidade Estadual do Norte Fluminense, Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Campos dos Goytacazes, RJ, Brasil
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11
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Panas MW, Boothroyd JC. Seizing control: How dense granule effector proteins enable Toxoplasma to take charge. Mol Microbiol 2021; 115:466-477. [PMID: 33400323 PMCID: PMC8344355 DOI: 10.1111/mmi.14679] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/02/2021] [Accepted: 01/03/2021] [Indexed: 12/24/2022]
Abstract
Control of the host cell is crucial to the Apicomplexan parasite, Toxoplasma gondii, while it grows intracellularly. To achieve this goal, these single-celled eukaryotes export a series of effector proteins from organelles known as "dense granules" that interfere with normal cellular processes and responses to invasion. While some effectors are found attached to the outer surface of the parasitophorous vacuole (PV) in which Toxoplasma tachyzoites reside, others are found in the host cell's cytoplasm and yet others make their way into the host nucleus, where they alter host transcription. Among the processes that are severely altered are innate immune responses, host cell cycle, and association with host organelles. The ways in which these crucial processes are altered through the coordinated action of a large collection of effectors is as elegant as it is complex, and is the central focus of the following review; we also discuss the recent advances in our understanding of how dense granule effector proteins are trafficked out of the PV.
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Affiliation(s)
- Michael W. Panas
- Dept. Microbiology and Immunology, Stanford University School of Medicine, Stanford CA 94305
| | - John C. Boothroyd
- Dept. Microbiology and Immunology, Stanford University School of Medicine, Stanford CA 94305
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12
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Snyder LM, Denkers EY. From Initiators to Effectors: Roadmap Through the Intestine During Encounter of Toxoplasma gondii With the Mucosal Immune System. Front Cell Infect Microbiol 2021; 10:614701. [PMID: 33505924 PMCID: PMC7829212 DOI: 10.3389/fcimb.2020.614701] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 11/24/2020] [Indexed: 12/26/2022] Open
Abstract
The gastrointestinal tract is a major portal of entry for many pathogens, including the protozoan parasite Toxoplasma gondii. Billions of people worldwide have acquired T. gondii at some point in their life, and for the vast majority this has led to latent infection in the central nervous system. The first line of host defense against Toxoplasma is located within the intestinal mucosa. Appropriate coordination of responses by the intestinal epithelium, intraepithelial lymphocytes, and lamina propria cells results in an inflammatory response that controls acute infection. Under some conditions, infection elicits bacterial dysbiosis and immune-mediated tissue damage in the intestine. Here, we discuss the complex interactions between the microbiota, the epithelium, as well as innate and adaptive immune cells in the intestinal mucosa that induce protective immunity, and that sometimes switch to inflammatory pathology as T. gondii encounters tissues of the gut.
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Affiliation(s)
- Lindsay M Snyder
- Center for Evolutionary and Theoretical Immunology and Department of Biology, University of New Mexico, Albuquerque, NM, United States
| | - Eric Y Denkers
- Center for Evolutionary and Theoretical Immunology and Department of Biology, University of New Mexico, Albuquerque, NM, United States
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13
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Ichimiya T, Yamakawa T, Hirano T, Yokoyama Y, Hayashi Y, Hirayama D, Wagatsuma K, Itoi T, Nakase H. Autophagy and Autophagy-Related Diseases: A Review. Int J Mol Sci 2020; 21:ijms21238974. [PMID: 33255983 PMCID: PMC7729615 DOI: 10.3390/ijms21238974] [Citation(s) in RCA: 133] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 11/19/2020] [Accepted: 11/24/2020] [Indexed: 12/20/2022] Open
Abstract
Autophagy refers to the process involving the decomposition of intracellular components via lysosomes. Autophagy plays an important role in maintaining and regulating cell homeostasis by degrading intracellular components and providing degradation products to cells. In vivo, autophagy has been shown to be involved in the starvation response, intracellular quality control, early development, and cell differentiation. Recent studies have revealed that autophagy dysfunction is implicated in neurodegenerative diseases and tumorigenesis. In addition to the discovery of certain disease-causing autophagy-related mutations and elucidation of the pathogenesis of conditions resulting from the abnormal degradation of selective autophagy substrates, the activation of autophagy is essential for prolonging life and suppressing aging. This article provides a comprehensive review of the role of autophagy in health, physiological function, and autophagy-related disease.
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Affiliation(s)
- Tadashi Ichimiya
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
- Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan;
| | - Tsukasa Yamakawa
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
| | - Takehiro Hirano
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
| | - Yoshihiro Yokoyama
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
| | - Yuki Hayashi
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
| | - Daisuke Hirayama
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
| | - Kohei Wagatsuma
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
| | - Takao Itoi
- Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan;
| | - Hiroshi Nakase
- Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo 060-8543, Japan; (T.I.); (T.Y.); (T.H.); (Y.Y.); (Y.H.); (D.H.); (K.W.)
- Correspondence: ; Tel.: +81-11-611-2111
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14
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Nyonda MA, Hammoudi PM, Ye S, Maire J, Marq JB, Yamamoto M, Soldati-Favre D. Toxoplasma gondii GRA60 is an effector protein that modulates host cell autonomous immunity and contributes to virulence. Cell Microbiol 2020; 23:e13278. [PMID: 33040458 DOI: 10.1111/cmi.13278] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 10/04/2020] [Accepted: 10/08/2020] [Indexed: 02/06/2023]
Abstract
Toxoplasma gondii infects virtually any nucleated cell and resides inside a non-phagocytic vacuole surrounded by a parasitophorous vacuolar membrane (PVM). Pivotal to the restriction of T. gondii dissemination upon infection in murine cells is the recruitment of immunity regulated GTPases (IRGs) and guanylate binding proteins (GBPs) to the PVM that leads to pathogen elimination. The virulent T. gondii type I RH strain secretes a handful of effectors including the dense granule protein GRA7, the serine-threonine kinases ROP17 and ROP18, and a pseudo-kinase ROP5, that synergistically inhibit the recruitment of IRGs to the PVM. Here, we characterise GRA60, a novel dense granule effector, which localises to the vacuolar space and PVM and contributes to virulence of RH in mice, suggesting a role in the subversion of host cell defence mechanisms. Members of the host cell IRG defence system Irgb10 and Irga6 are recruited to the PVM of RH parasites lacking GRA60 as observed previously for the avirulent RHΔrop5 mutant, with RH preventing such recruitment. Deletion of GRA60 in RHΔrop5 leads to a recruitment of IRGs comparable to the single knockouts. GRA60 therefore represents a novel parasite effector conferring resistance to IRGs in type I parasites, and found associated to ROP18, a member of the virulence complex.
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Affiliation(s)
- Mary Akinyi Nyonda
- Department of Microbiology and Molecular Medicine, University of Geneva, Geneva, Switzerland
| | - Pierre-Mehdi Hammoudi
- Department of Microbiology and Molecular Medicine, University of Geneva, Geneva, Switzerland
| | - Shu Ye
- Department of Microbiology and Molecular Medicine, University of Geneva, Geneva, Switzerland
| | - Jessica Maire
- Department of Microbiology and Molecular Medicine, University of Geneva, Geneva, Switzerland
| | - Jean-Baptiste Marq
- Department of Microbiology and Molecular Medicine, University of Geneva, Geneva, Switzerland
| | - Masahiro Yamamoto
- Department of Immunoparasitology, Division of Infectious Diseases, Osaka University, Suita, Japan
| | - Dominique Soldati-Favre
- Department of Microbiology and Molecular Medicine, University of Geneva, Geneva, Switzerland
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15
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Mukhopadhyay D, Arranz-Solís D, Saeij JPJ. Influence of the Host and Parasite Strain on the Immune Response During Toxoplasma Infection. Front Cell Infect Microbiol 2020; 10:580425. [PMID: 33178630 PMCID: PMC7593385 DOI: 10.3389/fcimb.2020.580425] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 09/11/2020] [Indexed: 01/02/2023] Open
Abstract
Toxoplasma gondii is an exceptionally successful parasite that infects a very broad host range, including humans, across the globe. The outcome of infection differs remarkably between hosts, ranging from acute death to sterile infection. These differential disease patterns are strongly influenced by both host- and parasite-specific genetic factors. In this review, we discuss how the clinical outcome of toxoplasmosis varies between hosts and the role of different immune genes and parasite virulence factors, with a special emphasis on Toxoplasma-induced ileitis and encephalitis.
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Affiliation(s)
- Debanjan Mukhopadhyay
- Department of Pathology, Microbiology & Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - David Arranz-Solís
- Department of Pathology, Microbiology & Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - Jeroen P J Saeij
- Department of Pathology, Microbiology & Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
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16
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Stifter SA, Bhattacharyya N, Sawyer AJ, Cootes TA, Stambas J, Doyle SE, Feigenbaum L, Paul WE, Britton WJ, Sher A, Feng CG. Visualizing the Selectivity and Dynamics of Interferon Signaling In Vivo. Cell Rep 2020; 29:3539-3550.e4. [PMID: 31825834 DOI: 10.1016/j.celrep.2019.11.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 09/25/2019] [Accepted: 11/06/2019] [Indexed: 01/09/2023] Open
Abstract
Interferons (IFN) are pleiotropic cytokines essential for defense against infection, but the identity and tissue distribution of IFN-responsive cells in vivo are poorly defined. In this study, we generate a mouse strain capable of reporting IFN-signaling activated by all three types of IFNs and investigate the spatio-temporal dynamics and identity of IFN-responding cells following IFN injection and influenza virus infection. Despite ubiquitous expression of IFN receptors, cellular responses to IFNs are highly heterogenous in vivo and are determined by anatomical site, cell type, cellular preference to individual IFNs, and activation status. Unexpectedly, type I and II pneumocytes, the primary target of influenza infection, exhibit striking differences in the strength and temporal dynamics of IFN signaling associated with differential susceptibility to the viral infection. Our findings suggest that time- and cell-type-dependent integration of distinct IFN signals govern the specificity and magnitude of IFN responses in vivo.
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Affiliation(s)
- Sebastian A Stifter
- Immunology and Host Defense Group, Discipline of Infectious Diseases and Immunology, Faculty of Medicine and Health, The University of Sydney, NSW 2006, Australia; Centenary Institute, The University of Sydney, NSW 2050, Australia
| | - Nayan Bhattacharyya
- Immunology and Host Defense Group, Discipline of Infectious Diseases and Immunology, Faculty of Medicine and Health, The University of Sydney, NSW 2006, Australia; Centenary Institute, The University of Sydney, NSW 2050, Australia
| | - Andrew J Sawyer
- Immunology and Host Defense Group, Discipline of Infectious Diseases and Immunology, Faculty of Medicine and Health, The University of Sydney, NSW 2006, Australia; Centenary Institute, The University of Sydney, NSW 2050, Australia
| | - Taylor A Cootes
- Immunology and Host Defense Group, Discipline of Infectious Diseases and Immunology, Faculty of Medicine and Health, The University of Sydney, NSW 2006, Australia; Centenary Institute, The University of Sydney, NSW 2050, Australia
| | - John Stambas
- School of Medicine, Deakin University, Geelong, VIC 3216, Australia
| | | | - Lionel Feigenbaum
- Laboratory Animal Sciences Program, National Cancer Institute, Frederick, MD 21702, USA
| | - William E Paul
- Cytokine Biology Unit, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA
| | - Warwick J Britton
- Centenary Institute, The University of Sydney, NSW 2050, Australia; Central Clinical School, Faculty of Medicine and Health, The University of Sydney, NSW 2006, Australia
| | - Alan Sher
- Immunobiology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892-3202, USA
| | - Carl G Feng
- Immunology and Host Defense Group, Discipline of Infectious Diseases and Immunology, Faculty of Medicine and Health, The University of Sydney, NSW 2006, Australia; Centenary Institute, The University of Sydney, NSW 2050, Australia.
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17
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Hu S, Shi Y, Ding T, Duan W, Qiu Z, Zhao Z. Functional characterization of an immunity-related GTPase gene in immune defense from obscure puffer (Takifugu obscurus). FISH & SHELLFISH IMMUNOLOGY 2020; 103:248-255. [PMID: 32408018 DOI: 10.1016/j.fsi.2020.05.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 04/18/2020] [Accepted: 05/09/2020] [Indexed: 06/11/2023]
Abstract
Immunity-related GTPases (IRGs) are a family of large interferon-inducible GTPases that function in effective host defense against invading pathogens. IRGs have been extensively studied in mammals for their roles in the elimination of intracellular pathogens; however, their homologs in lower vertebrates are not well known. In this study, an IRG from obscure puffer (Takifugu obscurus), ToIRG, was identified and further characterized for its functional activity. The ToIRG gene encodes a protein of 396 amino acids containing a typical N-terminal GTPase domain with three conserved motifs. Phylogenetic analysis revealed that it has a closer evolutionary relationship with mammalian GKS IRGs. Gene expression profile analysis revealed that ToIRG was ubiquitously expressed in all tested healthy tissues of obscure puffer and upregulated in response to Aeromonas hydrophila or Edwardsiella tarda challenge. The subcellular localization of ToIRG is characterized as condensed forms around the nucleus. Importantly, an antimicrobial assay in vitro suggested that ToIRG enhanced the ability of host cells to resist both intracellular (E. tarda) and extracellular pathogens (A. hydrophila). Taken together, these results provide the functional characterization of obscure puffer IRGs in immune defense, which is the first study to reveal the function of IRGs in bony fish and will provide important insights into the evolutionary divergence of IRGs.
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Affiliation(s)
- Sufei Hu
- Department of Marine Biology, College of Oceanography, Hohai University, Nanjing, 210098, China
| | - Yan Shi
- Department of Marine Biology, College of Oceanography, Hohai University, Nanjing, 210098, China.
| | - Tie Ding
- Department of Marine Biology, College of Oceanography, Hohai University, Nanjing, 210098, China
| | - Wen Duan
- Department of Marine Biology, College of Oceanography, Hohai University, Nanjing, 210098, China
| | - Ziyue Qiu
- Department of Marine Biology, College of Oceanography, Hohai University, Nanjing, 210098, China
| | - Zhe Zhao
- Department of Marine Biology, College of Oceanography, Hohai University, Nanjing, 210098, China.
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18
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Ipr1 Regulation by Cyclic GMP-AMP Synthase/Interferon Regulatory Factor 3 and Modulation of Irgm1 Expression via p53. Mol Cell Biol 2020; 40:MCB.00471-19. [PMID: 31988106 DOI: 10.1128/mcb.00471-19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 01/21/2020] [Indexed: 12/28/2022] Open
Abstract
Intracellular pathogen resistance 1 (Ipr1) has been found to be a mediator to integrate cyclic GMP-AMP synthase (cGAS)-interferon regulatory factor 3 (IRF3), activated by intracellular pathogens, with the p53 pathway. Previous studies have shown the process of Ipr1 induction by various immune reactions, including intracellular bacterial and viral infections. The present study demonstrated that Ipr1 is regulated by the cGAS-IRF3 pathway during pathogenic infection. IRF3 was found to regulate Ipr1 expression by directly binding the interferon-stimulated response element motif of the Ipr1 promoter. Knockdown of Ipr1 decreased the expression of immunity-related GTPase family M member 1 (Irgm1), which plays critical roles in autophagy initiation. Irgm1 promoter characterization revealed a p53 motif in front of the transcription start site. P53 was found to participate in regulation of Irgm1 expression and IPR1-related effects on P53 stability by affecting interactions between ribosomal protein L11 (RPL11) and transformed mouse 3T3 cell double minute 2 (MDM2). Our results indicate that Ipr1 integrates cGAS-IRF3 with p53-modulated Irgm1 expression.
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19
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Lee Y, Yamada H, Pradipta A, Ma JS, Okamoto M, Nagaoka H, Takashima E, Standley DM, Sasai M, Takei K, Yamamoto M. Initial phospholipid-dependent Irgb6 targeting to Toxoplasma gondii vacuoles mediates host defense. Life Sci Alliance 2019; 3:3/1/e201900549. [PMID: 31852733 PMCID: PMC6925386 DOI: 10.26508/lsa.201900549] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 12/02/2019] [Accepted: 12/02/2019] [Indexed: 12/19/2022] Open
Abstract
Toxoplasma gondii is an obligate intracellular protozoan parasite capable of infecting warm-blooded animals by ingestion. The organism enters host cells and resides in the cytoplasm in a membrane-bound parasitophorous vacuole (PV). Inducing an interferon response enables IFN-γ-inducible immunity-related GTPase (IRG protein) to accumulate on the PV and to restrict parasite growth. However, little is known about the mechanisms by which IRG proteins recognize and destroy T. gondii PV. We characterized the role of IRG protein Irgb6 in the cell-autonomous response against T. gondii, which involves vacuole ubiquitination and breakdown. We show that Irgb6 is capable of binding a specific phospholipid on the PV membrane. Furthermore, the absence of Irgb6 causes reduced targeting of other effector IRG proteins to the PV. This suggests that Irgb6 has a role as a pioneer in the process by which multiple IRG proteins access the PV. Irgb6-deficient mice are highly susceptible to infection by a strain of T. gondii avirulent in wild-type mice.
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Affiliation(s)
- Youngae Lee
- Department of Immunoparasitology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan.,Laboratory of Immunoparasitology, WPI Immunology Frontier Research Center, Osaka University, Osaka, Japan
| | - Hiroshi Yamada
- Department of Neuroscience, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Ariel Pradipta
- Department of Immunoparasitology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Ji Su Ma
- Department of Immunoparasitology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan.,Laboratory of Immunoparasitology, WPI Immunology Frontier Research Center, Osaka University, Osaka, Japan
| | - Masaaki Okamoto
- Department of Immunoparasitology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Hikaru Nagaoka
- Division of Malaria Research, Proteo-Science Center, Ehime University, Ehime, Japan
| | - Eizo Takashima
- Division of Malaria Research, Proteo-Science Center, Ehime University, Ehime, Japan
| | - Daron M Standley
- Department of Genome Informatics, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan.,Laboratory of Systems Immunology, WPI Immunology Frontier Research Center, Osaka University, Osaka, Japan
| | - Miwa Sasai
- Department of Immunoparasitology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan.,Laboratory of Immunoparasitology, WPI Immunology Frontier Research Center, Osaka University, Osaka, Japan
| | - Kohji Takei
- Department of Neuroscience, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Masahiro Yamamoto
- Department of Immunoparasitology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan .,Laboratory of Immunoparasitology, WPI Immunology Frontier Research Center, Osaka University, Osaka, Japan
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20
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Ufermann CM, Domröse A, Babel T, Tersteegen A, Cengiz SC, Eller SK, Spekker-Bosker K, Sorg UR, Förster I, Däubener W. Indoleamine 2,3-Dioxygenase Activity During Acute Toxoplasmosis and the Suppressed T Cell Proliferation in Mice. Front Cell Infect Microbiol 2019; 9:184. [PMID: 31231617 PMCID: PMC6561234 DOI: 10.3389/fcimb.2019.00184] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 05/13/2019] [Indexed: 12/21/2022] Open
Abstract
Toxoplasma gondii (T. gondii) is an obligate intracellular parasite and belongs to the phylum Apicomplexa. T. gondii is of medical and veterinary importance, because T. gondii causes the parasitic disease toxoplasmosis. In human cells, the interferon-gamma inducible indoleamine 2,3-dioxygenase 1 (IDO1) is an antimicrobial effector mechanism that degrades tryptophan to kynurenine and thus limits pathogen proliferation in vitro. Furthermore, IDO is described to have immunosuppressive properties, e.g., regulatory T cell differentiation and T cell suppression in humans and mice. However, there is only little known about the role of IDO1 in mice during acute toxoplasmosis. To shed further light on the role of mIDO1 in vivo, we have used a specifically adjusted experimental model. Therein, we infected mIDO1-deficient (IDO−/−) C57BL/6 mice and appropriate wild-type (WT) control mice with a high dose of T. gondii ME49 tachyozoites (type II strain) via the intraperitoneal route and compared the phenotype of IDO−/− and WT mice during acute toxoplasmosis. During murine T. gondii infection, we found mIDO1 mRNA and mIDO1 protein, as well as mIDO1-mediated tryptophan degradation in lungs of WT mice. IDO−/− mice show no tryptophan degradation in the lung during infection. Even though T. gondii is tryptophan auxotroph and rapidly replicates during acute infection, the parasite load was similar in IDO−/− mice compared to WT mice 7 days post-infection. IDO1 is described to have immunosuppressive properties, and since T cell suppression is observed during acute toxoplasmosis, we analyzed the possible involvement of mIDO1. Here, we did not find differences in the intensity of ex vivo mitogen stimulated T cell proliferation between WT and IDO−/− mice. Concomitant nitric oxide synthase inhibition and interleukin-2 supplementation increased the T cell proliferation from both genotypes drastically, but not completely. In sum, we analyzed the involvement of mIDO1 during acute murine toxoplasmosis in our specifically adjusted experimental model and found a definite mIDO1 induction. Nevertheless, mIDO1 seems to be functional redundant as an antiparasitic defense mechanism during acute toxoplasmosis in mice. Furthermore, we suggest that the systemic T cell suppression observed during acute toxoplasmosis is influenced by nitric oxide activity and IL-2 deprivation.
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Affiliation(s)
- Christoph-Martin Ufermann
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Andreas Domröse
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Timo Babel
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Anne Tersteegen
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Sevgi Can Cengiz
- Immunology and Environment, Life and Medical Sciences (LIMES) Institute, University of Bonn, Bonn, Germany
| | - Silvia Kathrin Eller
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Katrin Spekker-Bosker
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Ursula Regina Sorg
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Irmgard Förster
- Immunology and Environment, Life and Medical Sciences (LIMES) Institute, University of Bonn, Bonn, Germany
| | - Walter Däubener
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
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21
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Pereira-Dutra FS, Teixeira L, de Souza Costa MF, Bozza PT. Fat, fight, and beyond: The multiple roles of lipid droplets in infections and inflammation. J Leukoc Biol 2019; 106:563-580. [PMID: 31121077 DOI: 10.1002/jlb.4mr0119-035r] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 04/16/2019] [Accepted: 04/26/2019] [Indexed: 12/12/2022] Open
Abstract
Increased accumulation of cytoplasmic lipid droplets (LDs) in host nonadipose cells is commonly observed in response to numerous infectious diseases, including bacterial, parasite, and fungal infections. LDs are lipid-enriched, dynamic organelles composed of a core of neutral lipids surrounded by a monolayer of phospholipids associated with a diverse array of proteins that are cell and stimulus regulated. Far beyond being simply a deposit of neutral lipids, LDs have come to be seen as an essential platform for various cellular processes, including metabolic regulation, cell signaling, and the immune response. LD participation in the immune response occurs as sites for compartmentalization of several immunometabolic signaling pathways, production of inflammatory lipid mediators, and regulation of antigen presentation. Infection-driven LD biogenesis is a complexly regulated process that involves innate immune receptors, transcriptional and posttranscriptional regulation, increased lipid uptake, and new lipid synthesis. Accumulating evidence demonstrates that intracellular pathogens are able to exploit LDs as an energy source, a replication site, and/or a mechanism of immune response evasion. Nevertheless, LDs can also act in favor of the host as part of the immune and inflammatory response to pathogens. Here, we review recent findings that explored the new roles of LDs in the context of host-pathogen interactions.
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Affiliation(s)
- Filipe S Pereira-Dutra
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Livia Teixeira
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | | | - Patrícia T Bozza
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
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22
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Beraki T, Hu X, Broncel M, Young JC, O'Shaughnessy WJ, Borek D, Treeck M, Reese ML. Divergent kinase regulates membrane ultrastructure of the Toxoplasma parasitophorous vacuole. Proc Natl Acad Sci U S A 2019; 116:6361-6370. [PMID: 30850550 PMCID: PMC6442604 DOI: 10.1073/pnas.1816161116] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Apicomplexan parasites replicate within a protective organelle, called the parasitophorous vacuole (PV). The Toxoplasma gondii PV is filled with a network of tubulated membranes, which are thought to facilitate trafficking of effectors and nutrients. Despite being critical to parasite virulence, there is scant mechanistic understanding of the network's functions. Here, we identify the parasite-secreted kinase WNG1 (With-No-Gly-loop) as a critical regulator of tubular membrane biogenesis. WNG1 family members adopt an atypical protein kinase fold lacking the glycine rich ATP-binding loop that is required for catalysis in canonical kinases. Unexpectedly, we find that WNG1 is an active protein kinase that localizes to the PV lumen and phosphorylates PV-resident proteins, several of which are essential for the formation of a functional intravacuolar network. Moreover, we show that WNG1-dependent phosphorylation of these proteins is required for their membrane association, and thus their ability to tubulate membranes. Consequently, WNG1 knockout parasites have an aberrant PV membrane ultrastructure. Collectively, our results describe a unique family of Toxoplasma kinases and implicate phosphorylation of secreted proteins as a mechanism of regulating PV development during parasite infection.
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Affiliation(s)
- Tsebaot Beraki
- Department of Pharmacology, University of Texas, Southwestern Medical Center, Dallas, TX 75390
| | - Xiaoyu Hu
- Department of Pharmacology, University of Texas, Southwestern Medical Center, Dallas, TX 75390
| | - Malgorzata Broncel
- Signalling in Apicomplexan Parasites Laboratory, The Francis Crick Institute, NW1 1AT London United Kingdom
| | - Joanna C Young
- Signalling in Apicomplexan Parasites Laboratory, The Francis Crick Institute, NW1 1AT London United Kingdom
| | - William J O'Shaughnessy
- Department of Pharmacology, University of Texas, Southwestern Medical Center, Dallas, TX 75390
| | - Dominika Borek
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Moritz Treeck
- Signalling in Apicomplexan Parasites Laboratory, The Francis Crick Institute, NW1 1AT London United Kingdom
| | - Michael L Reese
- Department of Pharmacology, University of Texas, Southwestern Medical Center, Dallas, TX 75390;
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390
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23
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Furlong K, Hwang S. Autophagy and Noroviruses. Viruses 2019; 11:E244. [PMID: 30871000 PMCID: PMC6466346 DOI: 10.3390/v11030244] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 03/06/2019] [Accepted: 03/09/2019] [Indexed: 02/07/2023] Open
Abstract
Autophagy is an essential cellular process by which a cell degrades materials within its cytoplasm. Intracellular pathogens like viruses must deal with autophagy, either positively or negatively, for their own survival and replication. For some viruses, autophagy can even play proviral roles, helping their replication or dissemination. For other viruses, including noroviruses, the exact role of autophagy is more complex. This short review seeks to summarize the known interactions between autophagy, autophagy proteins and norovirus, and to address remaining questions relevant to these interactions.
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Affiliation(s)
- Kevin Furlong
- Committee on Microbiology, The University of Chicago, Chicago, IL 60637, USA.
| | - Seungmin Hwang
- Committee on Microbiology, The University of Chicago, Chicago, IL 60637, USA.
- Committee on Immunology, The University of Chicago, Chicago, IL 60637, USA.
- Committee on Cancer Biology, The University of Chicago, Chicago, IL 60637, USA.
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA.
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24
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Roles of Autophagy-Related Genes in the Pathogenesis of Inflammatory Bowel Disease. Cells 2019; 8:cells8010077. [PMID: 30669622 PMCID: PMC6356351 DOI: 10.3390/cells8010077] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2018] [Revised: 01/09/2019] [Accepted: 01/11/2019] [Indexed: 12/13/2022] Open
Abstract
Autophagy is an intracellular catabolic process that is essential for a variety of cellular responses. Due to its role in the maintenance of biological homeostasis in conditions of stress, dysregulation or disruption of autophagy may be linked to human diseases such as inflammatory bowel disease (IBD). IBD is a complicated inflammatory colitis disorder; Crohn’s disease and ulcerative colitis are the principal types. Genetic studies have shown the clinical relevance of several autophagy-related genes (ATGs) in the pathogenesis of IBD. Additionally, recent studies using conditional knockout mice have led to a comprehensive understanding of ATGs that affect intestinal inflammation, Paneth cell abnormality and enteric pathogenic infection during colitis. In this review, we discuss the various ATGs involved in macroautophagy and selective autophagy, including ATG16L1, IRGM, LRRK2, ATG7, p62, optineurin and TFEB in the maintenance of intestinal homeostasis. Although advances have been made regarding the involvement of ATGs in maintaining intestinal homeostasis, determining the precise contribution of autophagy has remained elusive. Recent efforts based on direct targeting of ATGs and autophagy will further facilitate the development of new therapeutic opportunities for IBD.
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25
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Mehto S, Jena KK, Nath P, Chauhan S, Kolapalli SP, Das SK, Sahoo PK, Jain A, Taylor GA, Chauhan S. The Crohn's Disease Risk Factor IRGM Limits NLRP3 Inflammasome Activation by Impeding Its Assembly and by Mediating Its Selective Autophagy. Mol Cell 2019; 73:429-445.e7. [PMID: 30612879 PMCID: PMC6372082 DOI: 10.1016/j.molcel.2018.11.018] [Citation(s) in RCA: 133] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 09/19/2018] [Accepted: 11/15/2018] [Indexed: 12/12/2022]
Abstract
Several large-scale genome-wide association studies genetically linked IRGM to Crohn’s disease and other inflammatory disorders in which the IRGM appears to have a protective function. However, the mechanism by which IRGM accomplishes this anti-inflammatory role remains unclear. Here, we reveal that IRGM/Irgm1 is a negative regulator of the NLRP3 inflammasome activation. We show that IRGM expression, which is increased by PAMPs, DAMPs, and microbes, can suppress the pro-inflammatory responses provoked by the same stimuli. IRGM/Irgm1 negatively regulates IL-1β maturation by suppressing the activation of the NLRP3 inflammasome. Mechanistically, we show that IRGM interacts with NLRP3 and ASC and hinders inflammasome assembly by blocking their oligomerization. Further, IRGM mediates selective autophagic degradation of NLRP3 and ASC. By suppressing inflammasome activation, IRGM/Irgm1 protects from pyroptosis and gut inflammation in a Crohn’s disease experimental mouse model. This study for the first time identifies the mechanism by which IRGM is protective against inflammatory disorders. IRGM negatively regulates NLRP3/ASC inflammasome activation IRGM obstructs NLRP3/ASC inflammasome assembly IRGM mediates selective autophagic degradation of NLRP3/ASC inflammasome Irgm1 by suppressing Nlrp3 inflammasome prevents gut inflammation in an IBD mouse model
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Affiliation(s)
- Subhash Mehto
- Cell Biology and Infectious Diseases Unit, Institute of Life Sciences, Bhubaneswar 751023, India
| | - Kautilya Kumar Jena
- Cell Biology and Infectious Diseases Unit, Institute of Life Sciences, Bhubaneswar 751023, India; School of Biotechnology, KIIT University, Bhubaneswar 751024, India
| | - Parej Nath
- Cell Biology and Infectious Diseases Unit, Institute of Life Sciences, Bhubaneswar 751023, India; School of Biotechnology, KIIT University, Bhubaneswar 751024, India
| | - Swati Chauhan
- Cell Biology and Infectious Diseases Unit, Institute of Life Sciences, Bhubaneswar 751023, India
| | | | - Saroj Kumar Das
- Cell Biology and Infectious Diseases Unit, Institute of Life Sciences, Bhubaneswar 751023, India
| | - Pradyumna Kumar Sahoo
- Cell Biology and Infectious Diseases Unit, Institute of Life Sciences, Bhubaneswar 751023, India
| | - Ashish Jain
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway; Centre for Cancer Cell Reprogramming, Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Gregory A Taylor
- Geriatric Research, Education, and Clinical Center, VA Medical Center, Durham, NC 27705, USA
| | - Santosh Chauhan
- Cell Biology and Infectious Diseases Unit, Institute of Life Sciences, Bhubaneswar 751023, India.
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26
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Lilue J, Doran AG, Fiddes IT, Abrudan M, Armstrong J, Bennett R, Chow W, Collins J, Collins S, Czechanski A, Danecek P, Diekhans M, Dolle DD, Dunn M, Durbin R, Earl D, Ferguson-Smith A, Flicek P, Flint J, Frankish A, Fu B, Gerstein M, Gilbert J, Goodstadt L, Harrow J, Howe K, Ibarra-Soria X, Kolmogorov M, Lelliott C, Logan DW, Loveland J, Mathews CE, Mott R, Muir P, Nachtweide S, Navarro FC, Odom DT, Park N, Pelan S, Pham SK, Quail M, Reinholdt L, Romoth L, Shirley L, Sisu C, Sjoberg-Herrera M, Stanke M, Steward C, Thomas M, Threadgold G, Thybert D, Torrance J, Wong K, Wood J, Yalcin B, Yang F, Adams DJ, Paten B, Keane TM. Sixteen diverse laboratory mouse reference genomes define strain-specific haplotypes and novel functional loci. Nat Genet 2018; 50:1574-1583. [PMID: 30275530 PMCID: PMC6205630 DOI: 10.1038/s41588-018-0223-8] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 08/02/2018] [Indexed: 12/11/2022]
Abstract
We report full-length draft de novo genome assemblies for 16 widely used inbred mouse strains and find extensive strain-specific haplotype variation. We identify and characterize 2,567 regions on the current mouse reference genome exhibiting the greatest sequence diversity. These regions are enriched for genes involved in pathogen defence and immunity and exhibit enrichment of transposable elements and signatures of recent retrotransposition events. Combinations of alleles and genes unique to an individual strain are commonly observed at these loci, reflecting distinct strain phenotypes. We used these genomes to improve the mouse reference genome, resulting in the completion of 10 new gene structures. Also, 62 new coding loci were added to the reference genome annotation. These genomes identified a large, previously unannotated, gene (Efcab3-like) encoding 5,874 amino acids. Mutant Efcab3-like mice display anomalies in multiple brain regions, suggesting a possible role for this gene in the regulation of brain development.
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MESH Headings
- Animals
- Animals, Laboratory
- Chromosome Mapping/veterinary
- Genetic Loci
- Genome
- Haplotypes/genetics
- Mice
- Mice, Inbred BALB C/genetics
- Mice, Inbred C3H/genetics
- Mice, Inbred C57BL/genetics
- Mice, Inbred CBA/genetics
- Mice, Inbred DBA/genetics
- Mice, Inbred NOD/genetics
- Mice, Inbred Strains/classification
- Mice, Inbred Strains/genetics
- Molecular Sequence Annotation
- Phylogeny
- Polymorphism, Single Nucleotide
- Species Specificity
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Affiliation(s)
- Jingtao Lilue
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Anthony G. Doran
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Ian T. Fiddes
- Center for Biomolecular Science and Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA
| | - Monica Abrudan
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Joel Armstrong
- Center for Biomolecular Science and Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA
| | - Ruth Bennett
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom
| | - William Chow
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Joanna Collins
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Stephan Collins
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique UMR7104, Institut National de la Santé et de la Recherche Médicale U964, Université de Strasbourg, 67404 Illkirch, France
- Centre des Sciences du Goût et de l’Alimentation, University of Bourgogne Franche-Comté, 21000 Dijon, France
| | - Anne Czechanski
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME 04609, USA
| | - Petr Danecek
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Mark Diekhans
- Center for Biomolecular Science and Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA
| | - Dirk-Dominik Dolle
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Matt Dunn
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Richard Durbin
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
- Department of Genetics, University of Cambridge, Downing Site, Cambridge CB2 3EH, UK
| | - Dent Earl
- Center for Biomolecular Science and Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA
| | - Anne Ferguson-Smith
- Department of Genetics, University of Cambridge, Downing Site, Cambridge CB2 3EH, UK
| | - Paul Flicek
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Jonathan Flint
- Brain Research Institute, University of California, 695 Charles E Young Dr S, Los Angeles, CA 90095, USA
| | - Adam Frankish
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Beiyuan Fu
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Mark Gerstein
- Yale Computational Biology and Bioinformatics, Yale University, New Haven, CT 06520, USA
| | - James Gilbert
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Leo Goodstadt
- OxFORD Asset Management, OxAM House, 6 George Street, Oxford OX1 2BW
| | - Jennifer Harrow
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Kerstin Howe
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | | | - Mikhail Kolmogorov
- Department of Computer Science and Engineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Chris Lelliott
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Darren W. Logan
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Jane Loveland
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Clayton E. Mathews
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Richard Mott
- Genetics Institute, University College London, Gower Street, London WC1E 6BT, UK
| | - Paul Muir
- Yale Computational Biology and Bioinformatics, Yale University, New Haven, CT 06520, USA
| | - Stefanie Nachtweide
- Institute of Mathematics and Computer Science, University of Greifswald, Domstraße 11, 17489 Greifswald, Germany
| | - Fabio C.P. Navarro
- Yale Computational Biology and Bioinformatics, Yale University, New Haven, CT 06520, USA
| | - Duncan T. Odom
- Cancer Research UK Cambridge Institute, University of Cambridge, Robinson Way, Cambridge, CB2 0RE, UK
- German Cancer Research Center (DKFZ), Division Signaling and Functional Genomics, 69120 Heidelberg, Germany
| | - Naomi Park
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Sarah Pelan
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Son K Pham
- BioTuring Inc., San Diego, California, CA92121
| | - Mike Quail
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Laura Reinholdt
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME 04609, USA
| | - Lars Romoth
- Institute of Mathematics and Computer Science, University of Greifswald, Domstraße 11, 17489 Greifswald, Germany
| | - Lesley Shirley
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Cristina Sisu
- Yale Computational Biology and Bioinformatics, Yale University, New Haven, CT 06520, USA
- Department of Bioscience, Brunel University London, Uxbridge UB8 3PH, UK
| | - Marcela Sjoberg-Herrera
- Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Mario Stanke
- Institute of Mathematics and Computer Science, University of Greifswald, Domstraße 11, 17489 Greifswald, Germany
| | - Charles Steward
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Mark Thomas
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Glen Threadgold
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - David Thybert
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
- Earlham Institute, Norwich Research Park, Norwich NR4 7UZ, UK
| | - James Torrance
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Kim Wong
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Jonathan Wood
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Binnaz Yalcin
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique UMR7104, Institut National de la Santé et de la Recherche Médicale U964, Université de Strasbourg, 67404 Illkirch, France
| | - Fengtang Yang
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - David J. Adams
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
| | - Benedict Paten
- Center for Biomolecular Science and Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA
| | - Thomas M. Keane
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SD, United Kingdom
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, CB10 1SA, UK
- School of Life Sciences, University of Nottingham, Nottingham, UK
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27
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Chen S, Yang D, Wen Y, Jiang Z, Zhang L, Jiang J, Chen Y, Hu T, Wang Q, Zhang Y, Liu Q. Dysregulated hemolysin liberates bacterial outer membrane vesicles for cytosolic lipopolysaccharide sensing. PLoS Pathog 2018; 14:e1007240. [PMID: 30138458 PMCID: PMC6124777 DOI: 10.1371/journal.ppat.1007240] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 09/05/2018] [Accepted: 07/25/2018] [Indexed: 01/22/2023] Open
Abstract
Inflammatory caspase-11/4/5 recognize cytosolic LPS from invading Gram-negative bacteria and induce pyroptosis and cytokine release, forming rapid innate antibacterial defenses. Since extracellular or vacuole-constrained bacteria are thought to rarely access the cytoplasm, how their LPS are exposed to the cytosolic sensors is a critical event for pathogen recognition. Hemolysin is a pore-forming bacterial toxin, which was generally accepted to rupture cell membrane, leading to cell lysis. Whether and how hemolysin participates in non-canonical inflammasome signaling remains undiscovered. Here, we show that hemolysin-overexpressed enterobacteria triggered significantly increased caspase-4 activation in human intestinal epithelial cell lines. Hemolysin promoted LPS cytosolic delivery from extracellular bacteria through dynamin-dependent endocytosis. Further, we revealed that hemolysin was largely associated with bacterial outer membrane vesicles (OMVs) and induced rupture of OMV-containing vacuoles, subsequently increasing LPS exposure to the cytosolic sensor. Accordingly, overexpression of hemolysin promoted caspase-11 dependent IL-18 secretion and gut inflammation in mice, which was associated with restricting bacterial colonization in vivo. Together, our work reveals a concept that hemolysin promotes noncanonical inflammasome activation via liberating OMVs for cytosolic LPS sensing, which offers insights into innate immune surveillance of dysregulated hemolysin via caspase-11/4 in intestinal antibacterial defenses. Sensing of lipopolysaccharide (LPS) in the cytosol triggers non-canonical inflammasome-mediated innate responses. Recent work revealed that bacterial outer membrane vesicles (OMVs) enables LPS to access the cytosol for extracellular bacteria. However, since intracellular OMVs are generally constrained in endosomes, how OMV-derived LPS gain access to the cytosol remains unknown. Here, we reported that hemolysin largely bound with OMVs and entered cells through dynamin-dependent endocytosis. Intracellular hemolysin significantly impaired OMVs-constrained vacuole integrity and increased OMV-derived LPS exposure to the cytosolic sensor, which promoted non-canonical inflammasome activation and restricted bacterial gut infections. This work reveals that dysregulated hemolysin promotes non-canonical inflammasome activation and alerts host immune recognition, providing insights into the more sophisticated biological functions of hemolysin upon infection.
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Affiliation(s)
- Shouwen Chen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Dahai Yang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
| | - Ying Wen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Zhiwei Jiang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Lingzhi Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Department of Pathology and Comprehensive Cancer Center, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Jiatiao Jiang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Yaozhen Chen
- Department of Transfusion Medicine, Xijing hospital, Xi’an, China
| | - Tianjian Hu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Qiyao Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
| | - Yuanxing Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
| | - Qin Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
- * E-mail:
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28
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Coers J, Brown HM, Hwang S, Taylor GA. Partners in anti-crime: how interferon-inducible GTPases and autophagy proteins team up in cell-intrinsic host defense. Curr Opin Immunol 2018; 54:93-101. [PMID: 29986303 DOI: 10.1016/j.coi.2018.06.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 06/11/2018] [Accepted: 06/13/2018] [Indexed: 02/08/2023]
Abstract
Once pathogens have breached the mechanical barriers to infection, survived extracellular immunity and successfully invaded host cells, cell-intrinsic immunity becomes the last line of defense to protect the mammalian host against viruses, bacteria, fungi and protozoa. Many cell-intrinsic defense programs act as high-precision weapons that specifically target intracellular microbes or cytoplasmic sites of microbial replication while leaving endogenous organelles unharmed. Critical executioners of cell-autonomous immunity include interferon-inducible dynamin-like GTPases and autophagy proteins, which often act cooperatively in locating and antagonizing intracellular pathogens. Here, we discuss possible mechanistic models to account for the functional interactions that occur between these two distinct classes of host defense proteins.
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Affiliation(s)
- Jörn Coers
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA.
| | - Hailey M Brown
- Committee on Immunology, The University of Chicago, IL 60637, USA
| | - Seungmin Hwang
- Committee on Immunology, The University of Chicago, IL 60637, USA; Committee on Microbiology, The University of Chicago, IL 60637, USA; Department of Pathology, The University of Chicago, IL 60637, USA
| | - Gregory A Taylor
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA; Department of Medicine, Division of Geriatrics, Center for the Study of Aging and Human Development, Duke University Medical Center, Durham, NC 27710, USA; Geriatric Research, Education, and Clinical Center, VA Medical Center, Durham, NC 27705, USA
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29
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Crisler WJ, Lenz LL. Crosstalk between type I and II interferons in regulation of myeloid cell responses during bacterial infection. Curr Opin Immunol 2018; 54:35-41. [PMID: 29886270 DOI: 10.1016/j.coi.2018.05.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 05/22/2018] [Accepted: 05/22/2018] [Indexed: 12/29/2022]
Abstract
Type I and type II interferons (IFNα/β and IFNγ) are cytokines that play indispensable roles in directing myeloid cell activity during inflammatory and immune responses. Each IFN type binds a distinct receptor (IFNAR or IFNGR) to transduce signals that reshape gene expression and function of myeloid and other cell types. In the context of murine models and human bacterial infections, production of IFNγ generally promotes resistance while production of IFNα/β is associated with increased host susceptibility. Here, we review mechanisms of crosstalk between type I and II IFNs in myeloid cells and their impact on myeloid cell activation and anti-microbial function.
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Affiliation(s)
- William J Crisler
- Department of Microbiology and Immunology, University of Colorado School of Medicine, Aurora, CO 80045, United States
| | - Laurel L Lenz
- Department of Microbiology and Immunology, University of Colorado School of Medicine, Aurora, CO 80045, United States.
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30
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Brown HM, Biering SB, Zhu A, Choi J, Hwang S. Demarcation of Viral Shelters Results in Destruction by Membranolytic GTPases: Antiviral Function of Autophagy Proteins and Interferon-Inducible GTPases. Bioessays 2018; 40:e1700231. [PMID: 29603284 PMCID: PMC5986617 DOI: 10.1002/bies.201700231] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 03/02/2018] [Indexed: 12/16/2022]
Abstract
A hallmark of positive-sense RNA viruses is the formation of membranous shelters for safe replication in the cytoplasm. Once considered invisible to the immune system, these viral shelters are now found to be antagonized through the cooperation of autophagy proteins and anti-microbial GTPases. This coordinated effort of autophagy proteins guiding GTPases functions against not only the shelters of viruses but also cytoplasmic vacuoles containing bacteria or protozoa, suggesting a broad immune-defense mechanism against disparate vacuolar pathogens. Fundamental questions regarding this process remain: how the host recognizes these membranous structures as a target, how the autophagy proteins bring the GTPases to the shelters, and how the recruited GTPases disrupt these shelters. In this review, these questions are discussed, the answers to which will significantly advance our understanding of the response to vacuole-like structures of pathogens, thereby paving the way for the development of broadly effective anti-microbial strategies for public health.
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Affiliation(s)
- Hailey M. Brown
- Committee on Immunology, The University of Chicago, Chicago, IL 60637, USA
| | - Scott B. Biering
- Committee on Microbiology, The University of Chicago, Chicago, IL 60637, USA
| | - Allen Zhu
- Committee on Cancer Biology, The University of Chicago, Chicago, IL 60637, USA
| | - Jayoung Choi
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA
| | - Seungmin Hwang
- Committee on Immunology, The University of Chicago, Chicago, IL 60637, USA
- Committee on Microbiology, The University of Chicago, Chicago, IL 60637, USA
- Committee on Cancer Biology, The University of Chicago, Chicago, IL 60637, USA
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA
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31
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Vallochi AL, Teixeira L, Oliveira KDS, Maya-Monteiro CM, Bozza PT. Lipid Droplet, a Key Player in Host-Parasite Interactions. Front Immunol 2018; 9:1022. [PMID: 29875768 PMCID: PMC5974170 DOI: 10.3389/fimmu.2018.01022] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/24/2018] [Indexed: 12/18/2022] Open
Abstract
Lipid droplets (lipid bodies, LDs) are dynamic organelles that have important roles in regulating lipid metabolism, energy homeostasis, cell signaling, membrane trafficking, and inflammation. LD biogenesis, composition, and functions are highly regulated and may vary according to the stimuli, cell type, activation state, and inflammatory environment. Increased cytoplasmic LDs are frequently observed in leukocytes and other cells in a number of infectious diseases. Accumulating evidence reveals LDs participation in fundamental mechanisms of host-pathogen interactions, including cell signaling and immunity. LDs are sources of eicosanoid production, and may participate in different aspects of innate signaling and antigen presentation. In addition, intracellular pathogens evolved mechanisms to subvert host metabolism and may use host LDs, as ways of immune evasion and nutrients source. Here, we review mechanisms of LDs biogenesis and their contributions to the infection progress, and discuss the latest discoveries on mechanisms and pathways involving LDs roles as regulators of the immune response to protozoan infection.
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Affiliation(s)
- Adriana Lima Vallochi
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
| | | | | | | | - Patricia T. Bozza
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
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32
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Henne WM, Reese ML, Goodman JM. The assembly of lipid droplets and their roles in challenged cells. EMBO J 2018; 37:embj.201898947. [PMID: 29789390 DOI: 10.15252/embj.201898947] [Citation(s) in RCA: 166] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 03/08/2018] [Accepted: 03/22/2018] [Indexed: 12/14/2022] Open
Abstract
Cytoplasmic lipid droplets are important organelles in nearly every eukaryotic and some prokaryotic cells. Storing and providing energy is their main function, but they do not work in isolation. They respond to stimuli initiated either on the cell surface or in the cytoplasm as conditions change. Cellular stresses such as starvation and invasion are internal insults that evoke changes in droplet metabolism and dynamics. This review will first outline lipid droplet assembly and then discuss how droplets respond to stress and in particular nutrient starvation. Finally, the role of droplets in viral and microbial invasion will be presented, where an unresolved issue is whether changes in droplet abundance promote the invader, defend the host, to try to do both. The challenges of stress and infection are often accompanied by changes in physical contacts between droplets and other organelles. How these changes may result in improving cellular physiology, an ongoing focus in the field, is discussed.
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Affiliation(s)
- W Mike Henne
- Department of Cell Biology, University of Texas Southwestern Medical School, Dallas, TX, USA
| | - Michael L Reese
- Department of Pharmacology, University of Texas Southwestern Medical School, Dallas, TX, USA
| | - Joel M Goodman
- Department of Pharmacology, University of Texas Southwestern Medical School, Dallas, TX, USA
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33
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Hsueh PT, Lin HH, Wang HH, Liu CL, Ni WF, Liu JK, Chang HH, Sun DS, Chen YS, Chen YL. Immune imbalance of global gene expression, and cytokine, chemokine and selectin levels in the brains of offspring with social deficits via maternal immune activation. GENES BRAIN AND BEHAVIOR 2018; 17:e12479. [PMID: 29656594 DOI: 10.1111/gbb.12479] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 02/27/2018] [Accepted: 04/05/2018] [Indexed: 12/13/2022]
Abstract
The murine maternal immune activation (MIA) offspring model enables longitudinal studies to explore aberrant social behaviors similar to those observed in humans. High levels of cytokines, chemokines and cell adhesion molecules (CAM) have been found in the plasma and/or brains of psychiatric patients. We hypothesized that upregulation of the systemic or brain immune response has an augmenting effect by potentially increasing the interplay between the neuronal and immune systems during the growth of the MIA offspring. In this study, a C57BL/6j MIA female offspring model exhibiting social deficits was established. The expression of fetal interferon (IFN)-stimulated (gbp3, irgm1, ifi44), adolescent immunodevelopmental transcription factor (eg, r2, tfap2b), hormone (pomc, hcrt), adult selectin (sell, selp) and neuroligin (nlgn2) genes was altered. Systemic upregulation of endogenous IL-10 occurred at the adult stage, while both IL-1β and IL-6 were increased and persisted in the sera throughout the growth of the MIA offspring. The cerebral IL-6 levels were endogenously upregulated, but both MCP-1 (macrophage inflammatory protein-1) and L-selectin levels were downregulated at the adolescent and/or adult stages. However, the MIA offspring were susceptible to lipopolysaccharide (LPS) stimulation. After reinjecting the MIA offspring with LPS in adulthood, a variety of sera and cerebral cytokines, chemokines and CAMs were increased. Particularly, both MCP-1 and L-selectin showed relatively high expression in the brain compared with the expression levels in phosphate-buffered saline (PBS)-treated offspring injected with LPS. Potentially, MCP-1 was attracted to the L-selectin-mediated immune cells due to augmentation of the immune response following stimulation in MIA female offspring.
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Affiliation(s)
- P-T Hsueh
- Department of Internal Medicine, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - H-H Lin
- Department of Internal Medicine, National Yang-Ming University, Taipei, Taiwan.,Section of Infectious Disease, Department of Medicine, E-Da Hospital, Kaohsiung, Taiwan
| | - H-H Wang
- Department of Biotechnology, National Kaohsiung Normal University, Kaohsiung, Taiwan
| | - C-L Liu
- Department of Biotechnology, National Kaohsiung Normal University, Kaohsiung, Taiwan
| | - W-F Ni
- Department of Biotechnology, National Kaohsiung Normal University, Kaohsiung, Taiwan
| | - J-K Liu
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan
| | - H-H Chang
- Department of Molecular Biology and Human Genetics, Tzu Chi University, Hualien, Taiwan
| | - D-S Sun
- Department of Molecular Biology and Human Genetics, Tzu Chi University, Hualien, Taiwan
| | - Y-S Chen
- Department of Internal Medicine, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Y-L Chen
- Department of Biotechnology, National Kaohsiung Normal University, Kaohsiung, Taiwan
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34
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López-Yglesias AH, Burger E, Araujo A, Martin AT, Yarovinsky F. T-bet-independent Th1 response induces intestinal immunopathology during Toxoplasma gondii infection. Mucosal Immunol 2018; 11:921-931. [PMID: 29297501 PMCID: PMC6179443 DOI: 10.1038/mi.2017.102] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 10/22/2017] [Indexed: 02/04/2023]
Abstract
Coordinated production of IFN-γ by innate and adaptive immune cells is central for host defense, but can also trigger immunopathology. The investigation of the lymphoid cell-specific contribution to the IFN-γ-mediated intestinal pathology during Toxoplasma gondii infection identified CD4+ T cells as a key cell population responsible for IFN-γ-dependent intestinal inflammation and Paneth cell loss, where T-bet-dependent group 1 innate lymphoid cells have a minor role in driving the parasite-induced immunopathology. This was evident from the analysis of T-bet deficiency that did not prevent the intestinal inflammation and instead revealed that T-bet-deficient CD4+ Th1 cells are sufficient for T. gondii-triggered acute ileitis and Paneth cell loss. These results revealed that T-bet-independent Th1 effector cells are major functional mediators of the type I immunopathological response during acute gastrointestinal infection.
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35
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Shi Y, Shen S, Hu S, Ding T, Hong X, Chen C, Zhu X, Zhao Z. Comparative study of two immunity-related GTPase genes in Chinese soft-shell turtle reveals their molecular characteristics and functional activity in immune defense. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 81:63-73. [PMID: 29154856 DOI: 10.1016/j.dci.2017.11.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 11/13/2017] [Accepted: 11/13/2017] [Indexed: 06/07/2023]
Abstract
The immunity-related GTPases (IRGs) are a family of proteins that play critical roles in innate resistance to intracellular pathogens. The number and diversity of IRG genes differ greatly in different species. Although IRG proteins have been well studies in mammals, they remain poorly characterized in lower vertebrates. In this study, we cloned two IRG genes, PsIRG5 and PsIRG8, from the Chinese soft-shelled turtle and compared their characterization and functional activity with mammalian IRGs. The PsIRG5 is a gene of 1896 bp that encodes a protein of 413 amino acid and PsIRG8 is 1543 bp in length encoding another 413 aa protein. Sequence alignment between all turtle IRG-like genes and mammalian IRGs showed that both PsIRG5 and PsIRG8 were conserved with mammalian GKS IRGs, while PsIRG5 appeared a closer evolutionary relationship with mammalian GMS IRGs. The expression and subcellular characterization revealed that PsIRG5 was dramatically upregulated under Aeromonas hydrophila challenge and exhibited co-localization with lysosomes in cells; whereas PsIRG8 was downregulated and has no distinct localization. Functional activity assay demonstrated that PsIRG5 plays a role in autophagy induction and IFN-γ contributes to enhance the induction, since it has IFN-inducible elements in its promoter region. These data above unravel the molecular characterization and functional activity of IRGs in lower vertebrate for the first time and will provide insights into the comparative immunity and evolutionary relationships of IRGs between mammals and reptiles.
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Affiliation(s)
- Yan Shi
- College of Oceanography, Hohai University, Nanjing 210098, China; Pear River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Sixian Shen
- Pear River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Sufei Hu
- College of Oceanography, Hohai University, Nanjing 210098, China
| | - Tie Ding
- College of Oceanography, Hohai University, Nanjing 210098, China
| | - Xiaoyou Hong
- Pear River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Chen Chen
- Pear River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Xinping Zhu
- Pear River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
| | - Zhe Zhao
- College of Oceanography, Hohai University, Nanjing 210098, China.
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36
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Ngo CC, Man SM. Mechanisms and functions of guanylate-binding proteins and related interferon-inducible GTPases: Roles in intracellular lysis of pathogens. Cell Microbiol 2017; 19. [DOI: 10.1111/cmi.12791] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Accepted: 09/22/2017] [Indexed: 12/17/2022]
Affiliation(s)
- Chinh C. Ngo
- Department of Immunology and Infectious Disease, The John Curtin School of Medical Research; Australian National University; Canberra Australia
| | - Si Ming Man
- Department of Immunology and Infectious Disease, The John Curtin School of Medical Research; Australian National University; Canberra Australia
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37
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Brasil TR, Freire-de-Lima CG, Morrot A, Vetö Arnholdt AC. Host- Toxoplasma gondii Coadaptation Leads to Fine Tuning of the Immune Response. Front Immunol 2017; 8:1080. [PMID: 28955329 PMCID: PMC5601305 DOI: 10.3389/fimmu.2017.01080] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 08/21/2017] [Indexed: 12/22/2022] Open
Abstract
Toxoplasma gondii has successfully developed strategies to evade host's immune response and reach immune privileged sites, which remains in a controlled environment inside quiescent tissue cysts. In this review, we will approach several known mechanisms used by the parasite to modulate mainly the murine immune system at its favor. In what follows, we review recent findings revealing interference of host's cell autonomous immunity and cell signaling, gene expression, apoptosis, and production of microbicide molecules such as nitric oxide and oxygen reactive species during parasite infection. Modulation of host's metalloproteinases of extracellular matrix is also discussed. These immune evasion strategies are determinant to parasite dissemination throughout the host taking advantage of cells from the immune system to reach brain and retina, crossing crucial hosts' barriers.
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Affiliation(s)
- Thaís Rigueti Brasil
- Laboratório de Biologia do Reconhecer, Universidade Estadual do Norte Fluminense, Rio de Janeiro, Brazil
| | | | - Alexandre Morrot
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
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38
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Azzam KM, Madenspacher JH, Cain DW, Lai L, Gowdy KM, Rai P, Janardhan K, Clayton N, Cunningham W, Jensen H, Patel PS, Kearney JF, Taylor GA, Fessler MB. Irgm1 coordinately regulates autoimmunity and host defense at select mucosal surfaces. JCI Insight 2017; 2:91914. [PMID: 28814662 DOI: 10.1172/jci.insight.91914] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 07/11/2017] [Indexed: 01/06/2023] Open
Abstract
The pathogenesis of primary Sjogren's syndrome (SS), an autoimmune disease that targets the mucosa of exocrine tissues, is poorly understood. Although several mouse models have been developed that display features of SS, most of these are within the larger context of a lupus-like presentation. Immunity-related GTPase family M protein 1 (Irgm1) is an interferon-inducible cytoplasmic GTPase that is reported to regulate autophagy and mitochondrial homeostasis. Here, we report that naive Irgm1-/- mice display lymphocytic infiltration of multiple mucosal tissues including the lung in a manner reminiscent of SS, together with IgA class-predominant autoantibodies including anti-Ro and anti-La. This phenotype persists in the germ-free state, but is abolished by deletion of Irgm3. Irgm1-/- mice have increased local production in the lung of TECP15-idiotype IgA, a natural antibody with dual reactivity against host and pneumococcal phosphorylcholine. Associated with this, Irgm1-/- mice display enhanced opsonization and clearance of Streptococcus pneumoniae from the lung and increased survival from pneumococcal pneumonia. Taken together, our results identify Irgm1 as a master regulator of mucosal immunity that dually modulates evolutionarily conserved self- and other-directed immune responses at the interface of host with environment.
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Affiliation(s)
| | | | - Derek W Cain
- Signal Transduction Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Lihua Lai
- Immunity, Inflammation and Disease Laboratory and
| | - Kymberly M Gowdy
- Department of Pharmacology and Toxicology, Brody School of Medicine, East Carolina University, Greenville, North Carolina, USA
| | - Prashant Rai
- Immunity, Inflammation and Disease Laboratory and
| | - Kyathanahalli Janardhan
- Cellular & Molecular Pathology Branch, National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA.,Integrated Laboratory Systems, Inc., Research Triangle Park, North Carolina, USA
| | - Natasha Clayton
- Cellular & Molecular Pathology Branch, National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Willie Cunningham
- Cellular & Molecular Pathology Branch, National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Heather Jensen
- Cellular & Molecular Pathology Branch, National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Preeyam S Patel
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - John F Kearney
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Gregory A Taylor
- Geriatric Research, Education, and Clinical Center, Durham VA Medical Center, Durham, North Carolina, USA
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39
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Experimental Porcine Toxoplasma gondii Infection as a Representative Model for Human Toxoplasmosis. Mediators Inflamm 2017; 2017:3260289. [PMID: 28883687 PMCID: PMC5572617 DOI: 10.1155/2017/3260289] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 06/16/2017] [Accepted: 07/05/2017] [Indexed: 12/01/2022] Open
Abstract
Porcine infections are currently not the state-of-the-art model to study human diseases. Nevertheless, the course of human and porcine toxoplasmosis is much more comparable than that of human and murine toxoplasmosis. For example, severity of infection, transplacental transmission, and interferon-gamma-induced antiparasitic effector mechanisms are similar in pigs and humans. In addition, the severe immunosuppression during acute infection described in mice does not occur in the experimentally infected ones. Thus, we hypothesise that porcine Toxoplasma gondii infection data are more representative for human toxoplasmosis. We therefore suggest that the animal model chosen must be critically evaluated for its assignability to human diseases.
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40
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Essential role for GABARAP autophagy proteins in interferon-inducible GTPase-mediated host defense. Nat Immunol 2017; 18:899-910. [PMID: 28604719 DOI: 10.1038/ni.3767] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 05/08/2017] [Indexed: 12/15/2022]
Abstract
Mammalian autophagy-related 8 (Atg8) homologs consist of LC3 proteins and GABARAPs, all of which are known to be involved in canonical autophagy. In contrast, the roles of Atg8 homologs in noncanonical autophagic processes are not fully understood. Here we show a unique role of GABARAPs, in particular gamma-aminobutyric acid (GABA)-A-receptor-associated protein-like 2 (Gabarapl2; also known as Gate-16), in interferon-γ (IFN-γ)-mediated antimicrobial responses. Cells that lacked GABARAPs but not LC3 proteins and mice that lacked Gate-16 alone were defective in the IFN-γ-induced clearance of vacuolar pathogens such as Toxoplasma. Gate-16 but not LC3b specifically associated with the small GTPase ADP-ribosylation factor 1 (Arf1) to mediate uniform distribution of interferon-inducible GTPases. The lack of GABARAPs reduced Arf1 activation, which led to formation of interferon-inducible GTPase-containing aggregates and hampered recruitment of interferon-inducible GTPases to vacuolar pathogens. Thus, GABARAPs are uniquely required for antimicrobial host defense through cytosolic distribution of interferon-inducible GTPases.
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41
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Roingeard P, Melo RCN. Lipid droplet hijacking by intracellular pathogens. Cell Microbiol 2016; 19. [PMID: 27794207 DOI: 10.1111/cmi.12688] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 10/24/2016] [Accepted: 10/26/2016] [Indexed: 12/15/2022]
Abstract
Lipid droplets were long considered to be simple storage structures, but they have recently been shown to be dynamic organelles involved in diverse biological processes, including emerging roles in innate immunity. Various intracellular pathogens, including viruses, bacteria, and parasites, specifically target host lipid droplets during their life cycle. Viruses such as hepatitis C, dengue, and rotaviruses use lipid droplets as platforms for assembly. Bacteria, such as mycobacteria and Chlamydia, and parasites, such as trypanosomes, use host lipid droplets for nutritional purposes. The possible use of lipid droplets by intracellular pathogens, as part of an anti-immunity strategy, is an intriguing question meriting further investigation in the near future.
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Affiliation(s)
- Philippe Roingeard
- INSERM U966 and IBiSA Electron Microscopy Facility, François Rabelais University and CHRU de Tours, Tours, France
| | - Rossana C N Melo
- Laboratory of Cell Biology, Institute of Biological Sciences, Federal University of Juiz de Fora-UFJF, Juiz de Fora, Minas Gerais, Brazil
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42
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Spanò S, Gao X, Hannemann S, Lara-Tejero M, Galán JE. A Bacterial Pathogen Targets a Host Rab-Family GTPase Defense Pathway with a GAP. Cell Host Microbe 2016; 19:216-26. [PMID: 26867180 DOI: 10.1016/j.chom.2016.01.004] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Revised: 12/24/2015] [Accepted: 01/19/2016] [Indexed: 12/21/2022]
Abstract
Cell-autonomous defense mechanisms are potent strategies that protect individual cells against intracellular pathogens. The Rab-family GTPase Rab32 was previously shown to restrict the intracellular human pathogen Salmonella Typhi, but its potential broader role in antimicrobial defense remains unknown. We show that Rab32 represents a general cell-autonomous, antimicrobial defense that is counteracted by two Salmonella effectors. Mice lacking Rab-32 or its nucleotide exchange factor BLOC-3 are permissive to S. Typhi infection and exhibit increased susceptibility to S. Typhimurium. S. Typhimurium counters this defense pathway by delivering two type III secretion effectors, SopD2, a Rab32 GAP, and GtgE, a specific Rab32 protease. An S. Typhimurium mutant strain lacking these two effectors exhibits markedly reduced virulence, which is fully restored in BLOC-3-deficient mice. These results demonstrate that a cell-autonomous, Rab32-dependent host defense pathway plays a central role in the defense against vacuolar pathogens and describe a mechanism evolved by a bacterial pathogen to counter it.
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Affiliation(s)
- Stefania Spanò
- Department of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA.
| | - Xiang Gao
- Department of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA
| | - Sebastian Hannemann
- Department of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA
| | - María Lara-Tejero
- Department of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA
| | - Jorge E Galán
- Department of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA.
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43
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Choi J, Biering SB, Hwang S. Quo vadis? Interferon-inducible GTPases go to their target membranes via the LC3-conjugation system of autophagy. Small GTPases 2016; 8:199-207. [PMID: 27428166 PMCID: PMC5680725 DOI: 10.1080/21541248.2016.1213090] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Many intracellular pathogens survive and replicate within vacuole-like structures in the cytoplasm. It has been unclear how the host immune system controls such pathogen-containing vacuoles. Interferon-inducible GTPases are dynamin-like GTPases that target the membranes of pathogen-containing vacuoles. Upon their oligomerization on the membrane, the vacuole structure disintegrates and the pathogen gets exposed to the hostile cytoplasm. What has been obscure is how the immune system detects and directs the GTPases to these pathogen shelters. Using a common protist parasite of mice, Toxoplasma gondii, we found that the LC3 conjugation system of autophagy is necessary and sufficient for targeting the interferon-inducible GTPases to membranes. We dubbed this process Targeting by AutophaGy proteins (TAG). In canonical autophagy, the LC3 conjugation system is required to form membrane-bound autophagosomes, which encircle and deliver cytosolic materials to lysosomes for degradation. In TAG, however, the conjugation system is required to mark the membranes of pathogen-containing vacuoles with ubiquitin-like LC3 homologs, which function as molecular beacons to recruit the GTPases to their target membranes. Our data suggest that the LC3 conjugation system of autophagy plays an essential role in detecting and marking pathogen-containing vacuoles for immune effector targeting by the host immune system.
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Affiliation(s)
- Jayoung Choi
- a Department of Pathology , The University of Chicago , Chicago , IL , USA
| | - Scott B Biering
- b Committee on Microbiology, The University of Chicago , Chicago , IL , USA
| | - Seungmin Hwang
- a Department of Pathology , The University of Chicago , Chicago , IL , USA.,b Committee on Microbiology, The University of Chicago , Chicago , IL , USA
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44
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Schulte K, Pawlowski N, Faelber K, Fröhlich C, Howard J, Daumke O. The immunity-related GTPase Irga6 dimerizes in a parallel head-to-head fashion. BMC Biol 2016; 14:14. [PMID: 26934976 PMCID: PMC4774019 DOI: 10.1186/s12915-016-0236-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 02/12/2016] [Indexed: 11/12/2022] Open
Abstract
Background The immunity-related GTPases (IRGs) constitute a powerful cell-autonomous resistance system against several intracellular pathogens. Irga6 is a dynamin-like protein that oligomerizes at the parasitophorous vacuolar membrane (PVM) of Toxoplasma gondii leading to its vesiculation. Based on a previous biochemical analysis, it has been proposed that the GTPase domains of Irga6 dimerize in an antiparallel fashion during oligomerization. Results We determined the crystal structure of an oligomerization-impaired Irga6 mutant bound to a non-hydrolyzable GTP analog. Contrary to the previous model, the structure shows that the GTPase domains dimerize in a parallel fashion. The nucleotides in the center of the interface participate in dimerization by forming symmetric contacts with each other and with the switch I region of the opposing Irga6 molecule. The latter contact appears to activate GTP hydrolysis by stabilizing the position of the catalytic glutamate 106 in switch I close to the active site. Further dimerization contacts involve switch II, the G4 helix and the trans stabilizing loop. Conclusions The Irga6 structure features a parallel GTPase domain dimer, which appears to be a unifying feature of all dynamin and septin superfamily members. This study contributes important insights into the assembly and catalytic mechanisms of IRG proteins as prerequisite to understand their anti-microbial action. Electronic supplementary material The online version of this article (doi:10.1186/s12915-016-0236-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kathrin Schulte
- Max-Delbrueck-Centrum for Molecular Medicine, Crystallography, Robert-Rössle-Strasse 10, 13125, Berlin, Germany
| | - Nikolaus Pawlowski
- Institute for Genetics, Department of Cell Genetics, University of Cologne, Zülpicher Strasse 47a, 50674, Cologne, Germany.,Present address: Bayer Pharma AG, Global Biologics Research, Nattermannallee 1, 50829, Cologne, Germany
| | - Katja Faelber
- Max-Delbrueck-Centrum for Molecular Medicine, Crystallography, Robert-Rössle-Strasse 10, 13125, Berlin, Germany
| | - Chris Fröhlich
- Max-Delbrueck-Centrum for Molecular Medicine, Crystallography, Robert-Rössle-Strasse 10, 13125, Berlin, Germany
| | - Jonathan Howard
- Institute for Genetics, Department of Cell Genetics, University of Cologne, Zülpicher Strasse 47a, 50674, Cologne, Germany. .,Fundação Calouste Gulbenkian, Instituto Gulbenkian de Ciência, 2781-156, Oeiras, Portugal.
| | - Oliver Daumke
- Max-Delbrueck-Centrum for Molecular Medicine, Crystallography, Robert-Rössle-Strasse 10, 13125, Berlin, Germany.
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Meunier E, Broz P. Interferon-inducible GTPases in cell autonomous and innate immunity. Cell Microbiol 2015; 18:168-80. [DOI: 10.1111/cmi.12546] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 11/12/2015] [Accepted: 11/13/2015] [Indexed: 12/28/2022]
Affiliation(s)
- Etienne Meunier
- Focal Area Infection Biology, Biozentrum; University of Basel; Basel Switzerland
| | - Petr Broz
- Focal Area Infection Biology, Biozentrum; University of Basel; Basel Switzerland
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46
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Gao Y, Wu J, Zhang M, Hou M, Ji M. Mice lack of LRG-47 display the attenuated outcome of infection with Schistosoma japonicum. Parasitol Res 2015; 115:1185-93. [PMID: 26660918 DOI: 10.1007/s00436-015-4853-9] [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: 09/14/2015] [Accepted: 11/27/2015] [Indexed: 10/22/2022]
Abstract
Interferon-inducible GTPase LRG-47 (also named immune-related GTPase M, Irgm1) is a member of the p47 GTPase family that has been shown to regulate host resistance to intracellular pathogens. Little knowledge has been known about the role of LRG-47 in host's responses to extracellular pathogens. To investigate possible roles of LRG-47 in the course of Schistosoma japonicum infection, LRG-47-deficient (LRG-47(-/-)) and wild-type (WT) mice were challenged with cercariae of S. japonicum, and the cellular and humoral responses in mice were analyzed. At the acute stage of S. japonicum infection, in contrast to WT mice, LRG-47(-/-) mice showed the significantly decreased egg burden, low schistosome-specific antibody response, and the decreased Th1 and increased Tc1 responses. Additionally, Schistosoma japonicum-specific egg antigen immunization also produced the similar humoral and cellular immune responses as S. japonicum infection. Taken together, these data suggested that the deficiency of LRG-47 might affect host's CD4(+) T cell immune response via the weakening of IFN-γ downstream signaling; however, the specific function of LRG-47 on dealing with extracellular worm needs to be further studied.
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Affiliation(s)
- Yanan Gao
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, Jiangsu, 210029, China.,College of Basic Medicine, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
| | - Jingjiao Wu
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, Jiangsu, 210029, China.,Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
| | - Meijuan Zhang
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, Jiangsu, 210029, China
| | - Min Hou
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, Jiangsu, 210029, China
| | - Minjun Ji
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, Jiangsu, 210029, China. .,Jiangsu Province Key Laboratory of Modern Pathogen Biology, Nanjing, Jiangsu, China.
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47
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Yuan L, Ke Z, Ma J, Guo Y, Li Y. IRGM gene polymorphisms and haplotypes associate with susceptibility of pulmonary tuberculosis in Chinese Hubei Han population. Tuberculosis (Edinb) 2015; 96:58-64. [PMID: 26786655 DOI: 10.1016/j.tube.2015.10.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 10/28/2015] [Accepted: 10/31/2015] [Indexed: 10/22/2022]
Abstract
Human immunity-related GTPase M (IRGM) is found to play an important role in defense against intracellular pathogen Mycobacterium tuberculosis (M. tuberculosis) in vitro by regulating autophagy. The objective of the study was to determine the association between IRGM polymorphisms and susceptibility to pulmonary tuberculosis (PTB) in Chinese Hubei Han population. In this study, 237 PTB patients and 269 healthy controls were screened for IRGM promoter single nucleotide polymorphisms (SNPs) by gene sequencing, and an association study was performed. A luciferase assay was used to determine the transcriptional activity of the promoter polymorphism. The relative expression level of IRGM gene was measured by Real time Quantitative PCR (qRT-PCR). We identified 3 polymorphisms [-1208 (rs4958842), -1161 (rs4958843), and -947 (rs4958846)] in the IRGM promoter region. Our finding showed that the IRGM -947 CT genotype as well as CC genotype decreased the risk of PTB in comparison with TT genotype (OR = 0.216, 95% CI = 0.141-0.331,P < 0.001 and OR = 0.167, 95% CI = 0.088-0.318, P < 0.001,respectively). The -947C allele decreased the risk of PTB in comparison with T allele (OR = 0.266, 95% CI = 0.196-0.362, P < 0.001). There was linkage disequilibrium between these three IRGM SNPs and we further analyzed the haplotypes of these SNPs. Six haplotypes were identified and we found that the haplotype ACC played a protective role in the susceptibility to PTB. In contrast, the ACT haplotype was associated with an increased susceptibility to PTB. In addition, the ACT haplotype reduced the relative luciferase activity of IRGM promoter and decreased the expression of IRGM in PTB patients. Our findings indicated that IRGM functional polymorphisms and haplotypes in promoter were associated with the susceptibility to PTB in Chinese Hubei Han population.
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Affiliation(s)
- Leyong Yuan
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, PR China
| | - Zunqiong Ke
- Department of Pharmacy, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei Province, PR China
| | - Jun Ma
- Department of Clinical Laboratory, Wuhan Medical Treatment Center, Wuhan, Hubei Province, PR China
| | - Yi Guo
- Department of Epidemiology, Wuhan University School of Public Health, Wuhan, Hubei Province, PR China
| | - Yan Li
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, PR China.
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Coers J, Haldar AK. Ubiquitination of pathogen-containing vacuoles promotes host defense to Chlamydia trachomatis and Toxoplasma gondii. Commun Integr Biol 2015; 8:e1115163. [PMID: 27066178 PMCID: PMC4802790 DOI: 10.1080/19420889.2015.1115163] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 10/26/2015] [Accepted: 10/26/2015] [Indexed: 11/24/2022] Open
Abstract
Many intracellular bacterial and protozoan pathogens reside within host cell vacuoles customized by the microbial invaders to fit their needs. Within such pathogen-containing vacuoles (PVs) microbes procure nutrients and simultaneously hide from cytosolic host defense systems. Among the many PV-resident human pathogens are the bacterium Chlamydia trachomatis and the protozoan Toxoplasma gondii. Immune responses directed against their PVs are poorly characterized. We reported that activation of host cells with IFNγ triggers the attachment of polyubiquitin chains to Toxoplasma- and Chlamydia-containing vacuoles and thereby marks PVs for destruction. In murine cells PV ubiquitination is dependent on IFNγ-inducible Immunity Related GTPases (IRGs). Human cells also decorate PVs with ubiquitin upon IFNγ priming; however, the molecular machinery promoting PV ubiquitination in human cells remains unknown and is likely to be distinct from the IRG-dependent pathway we described in murine cells. Thus, IFNγ-inducible PV ubiquitination constitutes a critical event in cell-autonomous immunity to C. trachomatis and T. gondii in mice and humans, but the molecular machinery underlying PV ubiquitination is expected to be multifaceted and possibly host species-specific.
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Affiliation(s)
- Jörn Coers
- Department of Molecular Genetics and Microbiology; Durham, NC USA; Department of Immunology; Duke University Medical Center; Durham, NC USA
| | - Arun K Haldar
- Department of Molecular Genetics and Microbiology ; Durham, NC USA
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Martins E, Santos RS, Bettencourt R. Vibrio diabolicus challenge in Bathymodiolus azoricus populations from Menez Gwen and Lucky Strike hydrothermal vent sites. FISH & SHELLFISH IMMUNOLOGY 2015; 47:962-977. [PMID: 26529571 DOI: 10.1016/j.fsi.2015.10.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 10/23/2015] [Accepted: 10/27/2015] [Indexed: 06/05/2023]
Abstract
Menez Gwen (MG) and Lucky Strike (LS) deep-sea hydrothermal vents are located at 850 m and 1730 m depths respectively and support chemosynthesis-based ecosystems partially differing in heavy metal concentration, temperature range, and faunistic composition. The successfully adapted deep-sea vent mussel Bathymodiolus azoricus is found at both vent locations. In such inhospitable environments survival strategies rely on the establishment of bacteria-vent animal symbiosis In spite of the toxic nature of deep-sea vents, the problem of microbial threat and the need for immunity exist in B. azoricus. This study aims at investigating the immune system of B. azoricus from MG and LS populations by comparing immune gene expressions profiles using the deep-sea vent-related Vibrio diabolicus. Expression of nineteen immune genes was analyzed from gill, digestive gland and mantle tissues upon 3 h, 12 h and 24 h V. diabolicus challenges. Based on quantitative-Polymerase Chain Reaction (qPCR) significant gene expression differences were found among MG and LS populations and challenge times MG mussels revealed that gill and digestive gland gene expression levels were remarkably higher than those from LS mussels. Expression of Carcinolectin, Serpin-2, SRCR, IRGs, RTK, TLR2, NF-κB, HSP70 and Ferritin genes was greater in MG than LS mussels. In contrast, mantle tissue from LS mussels revealed the highest peak of expression at 24 h for most genes analyzed. The activation of immune signaling pathways demonstrated that gene expression profiles are distinct between the two mussel populations. These differences may possibly ensue from intrinsic immune transcriptional activities upon which host responses are modulated in presence of V. diabolicus. mRNA transcript variations were assessed during 24 h acclimatization taking into account the partial depuration to which mussels were subjected to. Additionally, gene expression differences may reflect still accountable effects from the presence of vent remaining microfluidic environments within the tissues analyzed.
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Affiliation(s)
- Eva Martins
- IMAR Institute of Marine Research Center, Portugal; MARE- Marine and Environmental Sciences Centre, Rua Prof. Dr. Frederico Machado, 9901-862 Horta, Portugal.
| | - Ricardo Serrão Santos
- IMAR Institute of Marine Research Center, Portugal; MARE- Marine and Environmental Sciences Centre, Rua Prof. Dr. Frederico Machado, 9901-862 Horta, Portugal; Department of Oceanography and Fisheries, University of the Azores, Portugal
| | - Raul Bettencourt
- IMAR Institute of Marine Research Center, Portugal; MARE- Marine and Environmental Sciences Centre, Rua Prof. Dr. Frederico Machado, 9901-862 Horta, Portugal.
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50
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Murray HW, Mitchell-Flack M, Taylor GA, Ma X. IFN-γ-induced macrophage antileishmanial mechanisms in mice: A role for immunity-related GTPases, Irgm1 and Irgm3, in Leishmania donovani infection in the liver. Exp Parasitol 2015; 157:103-9. [PMID: 26208780 PMCID: PMC4640457 DOI: 10.1016/j.exppara.2015.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 07/14/2015] [Accepted: 07/19/2015] [Indexed: 12/14/2022]
Abstract
In C57BL/6 mice, Leishmania donovani infection in the liver provoked IFN-γ-induced expression of the immunity-related GTPases (IRG), Irgm1 and Irgm3. To gauge the antileishmanial effects of these macrophage factors in the liver, intracellular infection was analyzed in IRG-deficient mice. In early- (but not late-) stage infection, Irgm3(-/-) mice failed to properly control parasite replication, generated little tissue inflammation and were hyporesponsive to pentavalent antimony (Sb) chemotherapy. Observations limited to early-stage infection in Irgm1(-/-) mice demonstrated increased susceptibility and virtually no inflammatory cell recruitment to heavily-parasitized parenchymal foci but an intact response to chemotherapy. In L. donovani infection in the liver, the absence of either Irgm1 or Irgm3 impairs early inflammation and initial resistance; the absence of Irgm3, but not Irgm1, also appears to impair the intracellular efficacy of Sb chemotherapy.
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Affiliation(s)
- Henry W Murray
- Department of Medicine, Weill Cornell Medical College, New York, NY, USA.
| | | | - Gregory A Taylor
- Departments of Medicine, Molecular Genetics and Microbiology and Immunology, Division of Geriatrics and Center for the Study of Aging and Human Development, Duke University Medical Center, Durham, NC, USA; Geriatric Research, Education and Clinical Center, VA Medical Center, Durham, NC, USA
| | - Xiaojing Ma
- Shanghai Jiaotong University, School of Life Science and Biotechnology, Shanghai, China; Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY, USA
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