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Nagy PD. Co-opted membranes, lipids, and host proteins: what have we learned from tombusviruses? Curr Opin Virol 2022; 56:101258. [PMID: 36166851 DOI: 10.1016/j.coviro.2022.101258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 08/01/2022] [Accepted: 08/21/2022] [Indexed: 11/28/2022]
Abstract
Positive-strand RNA viruses replicate in intracellular membranous structures formed after virus-driven intensive manipulation of subcellular organelles and membranes. These unique structures are called viral-replication organelles (VROs). To build VROs, the replication proteins coded by (+)RNA viruses co-opt host proteins, including membrane-shaping, lipid synthesis, and lipid-modification enzymes to create an optimal microenvironment that (i) concentrates the viral replicase and associated host proteins and the viral RNAs; (ii) regulates enzymatic activities and spatiotemporally the replication process; and (iii) protects the viral RNAs from recognition and degradation by the host innate immune defense. Tomato bushy stunt virus (TBSV), a plant (+)RNA virus, serves as an advanced model to study the interplay among viral components, co-opted host proteins, lipids, and membranes. This review presents our current understanding of the complex interaction between TBSV and host with panviral implications.
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Affiliation(s)
- Peter D Nagy
- Department of Plant Pathology, University of Kentucky, Lexington, KY 40546, USA.
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Kang TG, Kwon KW, Kim K, Lee I, Kim MJ, Ha SJ, Shin SJ. Viral coinfection promotes tuberculosis immunopathogenesis by type I IFN signaling-dependent impediment of Th1 cell pulmonary influx. Nat Commun 2022; 13:3155. [PMID: 35672321 PMCID: PMC9174268 DOI: 10.1038/s41467-022-30914-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 05/06/2022] [Indexed: 01/09/2023] Open
Abstract
Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is often exacerbated upon coinfection, but the underlying immunological mechanisms remain unclear. Here, to elucidate these mechanisms, we use an Mtb and lymphocytic choriomeningitis virus coinfection model. Viral coinfection significantly suppresses Mtb-specific IFN-γ production, with elevated bacterial loads and hyperinflammation in the lungs. Type I IFN signaling blockade rescues the Mtb-specific IFN-γ response and ameliorates lung immunopathology. Single-cell sequencing, tissue immunofluorescence staining, and adoptive transfer experiments indicate that viral infection-induced type I IFN signaling could inhibit CXCL9/10 production in myeloid cells, ultimately impairing pulmonary migration of Mtb-specific CD4+ T cells. Thus, our study suggests that augmented and sustained type I IFNs by virus coinfection prior to the pulmonary localization of Mtb-specific Th1 cells exacerbates TB immunopathogenesis by impeding the Mtb-specific Th1 cell influx. Our study highlights a negative function of viral coinfection-induced type I IFN responses in delaying Mtb-specific Th1 responses in the lung. Viral coinfection alongside mycobacterium tuberculosis (Mtb) infection may lead to immune complications or interference with immune responses. Here the authors show that in mice infected with Mtb and LCMV virus the specific TH1 response to MTb is reduced through a type I IFN response to the infecting virus.
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Affiliation(s)
- Tae Gun Kang
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea.,Brain Korea 21 (BK21) FOUR Program, Yonsei Education & Research Center for Biosystems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Kee Woong Kwon
- Department of Microbiology, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Kyungsoo Kim
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea.,Institute for Breast Cancer Precision Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Insuk Lee
- Department of Biotechnology, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
| | - Myeong Joon Kim
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea.,Brain Korea 21 (BK21) FOUR Program, Yonsei Education & Research Center for Biosystems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Sang-Jun Ha
- Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea. .,Brain Korea 21 (BK21) FOUR Program, Yonsei Education & Research Center for Biosystems, Yonsei University, Seoul, 03722, Republic of Korea.
| | - Sung Jae Shin
- Department of Microbiology, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea. .,Institute for Immunology and Immunological Disease, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea.
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Molho M, Prasanth KR, Pogany J, Nagy PD. Targeting conserved co-opted host factors to block virus replication: Using allosteric inhibitors of the cytosolic Hsp70s to interfere with tomato bushy stunt virus replication. Virology 2021; 563:1-19. [PMID: 34399236 DOI: 10.1016/j.virol.2021.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 08/03/2021] [Accepted: 08/04/2021] [Indexed: 11/21/2022]
Abstract
To further our understanding of the pro-viral roles of the host cytosolic heat shock protein 70 (Hsp70) family, we chose the conserved Arabidopsis thaliana Hsp70-2 and the unique Erd2 (early response to dehydration 2), which contain Hsp70 domains. Based on in vitro studies with purified components, we show that AtHsp70-2 and AtErd2 perform pro-viral functions equivalent to that of the yeast Ssa1 Hsp70. These functions include activation of the tombusvirus RdRp, and stimulation of replicase assembly. Yeast-based complementation studies demonstrate that AtHsp70-2 or AtErd2 are present in the purified tombusvirus replicase. RNA silencing and over-expression studies in Nicotiana benthamiana suggest that both Hsp70-2 and Erd2 are co-opted by tomato bushy stunt virus (TBSV). Moreover, we used allosteric inhibitors of Hsp70s to inhibit replication of TBSV and related plant viruses in plants. Altogether, interfering with the functions of the co-opted Hsp70s could be an effective antiviral approach against tombusviruses in plants.
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Affiliation(s)
- Melissa Molho
- Department of Plant Pathology, University of Kentucky, Lexington, KY, 40546, USA
| | - K Reddisiva Prasanth
- Department of Plant Pathology, University of Kentucky, Lexington, KY, 40546, USA
| | - Judit Pogany
- Department of Plant Pathology, University of Kentucky, Lexington, KY, 40546, USA
| | - Peter D Nagy
- Department of Plant Pathology, University of Kentucky, Lexington, KY, 40546, USA.
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Nagy PD, Feng Z. Tombusviruses orchestrate the host endomembrane system to create elaborate membranous replication organelles. Curr Opin Virol 2021; 48:30-41. [PMID: 33845410 DOI: 10.1016/j.coviro.2021.03.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/19/2021] [Accepted: 03/21/2021] [Indexed: 02/09/2023]
Abstract
Positive-strand RNA viruses depend on intensive manipulation of subcellular organelles and membranes to create unique viral replication organelles (VROs), which represent the sites of robust virus replication. The host endomembrane-based protein-trafficking and vesicle-trafficking pathways are specifically targeted by many (+)RNA viruses to take advantage of their rich resources. We summarize the critical roles of co-opted endoplasmic reticulum subdomains and associated host proteins and COPII vesicles play in tombusvirus replication. We also present the surprising contribution of the early endosome and the retromer tubular transport carriers to VRO biogenesis. The central player is tomato bushy stunt virus (TBSV), which provides an outstanding system based on the identification of a complex network of interactions with the host cells. We present the emerging theme on how TBSV uses tethering and membrane-shaping proteins and lipid modifying enzymes to build the sophisticated VRO membranes with unique lipid composition.
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Affiliation(s)
- Peter D Nagy
- Department of Plant Pathology, University of Kentucky, Lexington, KY 40546, USA.
| | - Zhike Feng
- Department of Plant Pathology, University of Kentucky, Lexington, KY 40546, USA
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Dahle MK, Jørgensen JB. Antiviral defense in salmonids - Mission made possible? FISH & SHELLFISH IMMUNOLOGY 2019; 87:421-437. [PMID: 30708056 DOI: 10.1016/j.fsi.2019.01.043] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 01/24/2019] [Accepted: 01/27/2019] [Indexed: 06/09/2023]
Abstract
Viral diseases represent one of the major threats for salmonid aquaculture. Survival from viral infections are highly dependent on host innate antiviral immune defense, where interferons are of crucial importance. Neutralizing antibodies and T cell effector mechanisms mediate long-term antiviral protection. Despite an immune cell repertoire comparable to higher vertebrates, farmed fish often fail to mount optimal antiviral protection. In the quest to multiply and spread, viruses utilize a variety of strategies to evade or escape the host immune system. Understanding the specific interplay between viruses and host immunity at depth is crucial for developing successful vaccination and treatment strategies in mammals. However, this knowledge base is still limited for pathogenic fish viruses. Here, we have focused on five RNA viruses with major impact on salmonid aquaculture: Salmonid alphavirus, Infectious salmon anemia virus, Infectious pancreatic necrosis virus, Piscine orthoreovirus and Piscine myocarditis virus. This review explore the protective immune responses that salmonids mount to these viruses and the existing knowledge on how the viruses counteract and/or bypass the immune response, including their IFN antagonizing effects and their mechanisms to establish persisting infections.
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Affiliation(s)
- Maria K Dahle
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries & Economics, University of Tromsø, The Arctic University of Norway, Norway; Department of Fish Health, Norwegian Veterinary Institute, Oslo, Norway
| | - Jorunn B Jørgensen
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries & Economics, University of Tromsø, The Arctic University of Norway, Norway.
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McNab F, Mayer-Barber K, Sher A, Wack A, O'Garra A. Type I interferons in infectious disease. Nat Rev Immunol 2015; 15:87-103. [PMID: 25614319 DOI: 10.1038/nri3787] [Citation(s) in RCA: 1726] [Impact Index Per Article: 191.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Type I interferons (IFNs) have diverse effects on innate and adaptive immune cells during infection with viruses, bacteria, parasites and fungi, directly and/or indirectly through the induction of other mediators. Type I IFNs are important for host defence against viruses. However, recently, they have been shown to cause immunopathology in some acute viral infections, such as influenza virus infection. Conversely, they can lead to immunosuppression during chronic viral infections, such as lymphocytic choriomeningitis virus infection. During bacterial infections, low levels of type I IFNs may be required at an early stage, to initiate cell-mediated immune responses. High concentrations of type I IFNs may block B cell responses or lead to the production of immunosuppressive molecules, and such concentrations also reduce the responsiveness of macrophages to activation by IFNγ, as has been shown for infections with Listeria monocytogenes and Mycobacterium tuberculosis. Recent studies in experimental models of tuberculosis have demonstrated that prostaglandin E2 and interleukin-1 inhibit type I IFN expression and its downstream effects, demonstrating that a cross-regulatory network of cytokines operates during infectious diseases to provide protection with minimum damage to the host.
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Affiliation(s)
- Finlay McNab
- 1] Allergic Inflammation Discovery Performance Unit, Respiratory Disease Respiratory Research and Development, GlaxoSmithKline, Stevenage, Hertfordshire SG1 2NY, UK. [2] Division of Immunoregulation, Medical Research Council (MRC) National Institute for Medical Research, Mill Hill, London NW7 1AA, UK
| | - Katrin Mayer-Barber
- Immunobiology Section, Laboratory of Parasitic Diseases (LPD), National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, Maryland 20892, USA
| | - Alan Sher
- Immunobiology Section, Laboratory of Parasitic Diseases (LPD), National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, Maryland 20892, USA
| | - Andreas Wack
- Division of Immunoregulation, Medical Research Council (MRC) National Institute for Medical Research, Mill Hill, London NW7 1AA, UK
| | - Anne O'Garra
- 1] Division of Immunoregulation, Medical Research Council (MRC) National Institute for Medical Research, Mill Hill, London NW7 1AA, UK. [2] National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, London, UK
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