1
|
Zhang Y, Ma R, Wang Y, Sun W, Yang Z, Han M, Han T, Wu XA, Liu R. Viruses Run: The Evasion Mechanisms of the Antiviral Innate Immunity by Hantavirus. Front Microbiol 2021; 12:759198. [PMID: 34659193 PMCID: PMC8516094 DOI: 10.3389/fmicb.2021.759198] [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: 08/16/2021] [Accepted: 09/10/2021] [Indexed: 11/13/2022] Open
Abstract
Hantavirus can cause hemorrhagic fever with renal syndrome (HFRS) in Eurasia and hantavirus pulmonary syndrome (HPS) in America, with high mortality and unknown mechanisms. Innate immunity is the host's first-line defense to bridge the acquired immunity against viral infections. However, hantavirus has evolved various strategies in both molecular and cellular aspects to evade the host's natural immune surveillance. The Interferon-I (IFN-I) signaling pathway, a central link of host defense, induces various antiviral proteins to control the infection. This paper summarizes the molecular mechanisms of hantavirus evasion mechanisms of the IFN signaling pathway and cellular processes such as regulated cell death and cell stress. Besides, hantavirus could also evade immune surveillance evasion through cellular mechanisms, such as upregulating immune checkpoint molecules interfering with viral infections. Understanding hantavirus's antiviral immune evasion mechanisms will deepen our understanding of its pathogenesis and help us develop more effective methods to control and eliminate hantavirus.
Collapse
Affiliation(s)
- Yusi Zhang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Ruixue Ma
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Yutong Wang
- School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Wenjie Sun
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Ziwei Yang
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Mingwei Han
- School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Tixin Han
- School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Xing-an Wu
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Rongrong Liu
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| |
Collapse
|
2
|
Chulpanova DS, Solovyeva VV, Isaeva GS, St. Jeor S, Khaiboullina SF, Rizvanov AA. Recombinant histone H1.3 inhibits orthohantavirus infection in vitro. BIONANOSCIENCE 2020. [DOI: 10.1007/s12668-020-00759-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
3
|
Chen QZ, Wang X, Luo F, Li N, Zhu N, Lu S, Zan YX, Zhong CJ, Wang MR, Hu HT, Zhang YZ, Xiong HR, Hou W. HTNV Sensitizes Host Toward TRAIL-Mediated Apoptosis-A Pivotal Anti-hantaviral Role of TRAIL. Front Immunol 2020; 11:1072. [PMID: 32636833 PMCID: PMC7317014 DOI: 10.3389/fimmu.2020.01072] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Accepted: 05/04/2020] [Indexed: 01/15/2023] Open
Abstract
Hantaviruses can cause hemorrhagic fever with renal syndrome (HFRS) in Eurasia and have led to public health threat in China. The pathogenesis of HFRS is complex and involves capillary leakage due to the infection of vascular endothelial cells. Accumulating evidence has demonstrated that hantavirus can induce apoptosis in many cells, but the mechanism remains unclear. Our studies showed that Hantaan virus (HTNV) infection could induce TNF-related apoptosis-inducing ligand (TRAIL) expression in primary human umbilical vein endothelial cells (HUVECs) and sensitize host cells toward TRAIL-mediated apoptosis. Furthermore, TRAIL interference could inhibit apoptosis and enhance the production of HTNV as well as reduce IFN-β production, while exogenous TRAIL treatment showed reverse outcome: enhanced apoptosis and IFN-β production as well as a lower level of viral replication. We also observed that nucleocapsid protein (NP) and glycoprotein (GP) of HTNV could promote the transcriptions of TRAIL and its receptors. Thus, TRAIL was upregulated by HTNV infection and then exhibited significant antiviral activities in vitro, and it was further confirmed in the HTNV-infected suckling mice model that TRAIL treatment significantly reduced viral load, alleviated virus-induced tissue lesions, increased apoptotic cells, and decreased the mortality. In conclusion, these results demonstrate that TRAIL-dependent apoptosis and IFN-β production could suppress HTNV replication and TRAIL treatment might be a novel therapeutic target for HTNV infection.
Collapse
Affiliation(s)
- Qing-Zhou Chen
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Xin Wang
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Fan Luo
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Ning Li
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Ni Zhu
- Department of Microbiology, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, China
| | - Shuang Lu
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Yu-Xing Zan
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Chao-Jie Zhong
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Mei-Rong Wang
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Hai-Tao Hu
- Department of Microbiology & Immunology and Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, TX, United States
| | - Yong-Zhen Zhang
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Chinese Center for Disease Control and Prevention, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Hai-Rong Xiong
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China
| | - Wei Hou
- State Key Laboratory of Virology, Hubei Province Key Laboratory of Allergy & Immunology, School of Basic Medical Sciences, Institute of Medical Virology, Wuhan University, Wuhan, China.,Department of Microbiology, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, China
| |
Collapse
|
4
|
Reuter M, Krüger DH. The nucleocapsid protein of hantaviruses: much more than a genome-wrapping protein. Virus Genes 2017; 54:5-16. [PMID: 29159494 DOI: 10.1007/s11262-017-1522-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 11/11/2017] [Indexed: 12/11/2022]
Abstract
The nucleocapsid (N) protein of hantaviruses represents an impressive example of a viral multifunctional protein. It encompasses properties as diverse as genome packaging, RNA chaperoning, intracellular protein transport, DNA degradation, intervention in host translation, and restricting host immune responses. These functions all rely on the capability of N to interact with RNA and other viral and cellular proteins. We have compiled data on the N protein of different hantavirus species together with information of the recently published three-dimensional structural data of the protein. The array of diverse functional activities accommodated in the hantaviral N protein goes far beyond to be a static structural protein and makes it an interesting target in the development of antiviral therapeutics.
Collapse
Affiliation(s)
- Monika Reuter
- Institute of Virology, Helmut-Ruska-Haus, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.
| | - Detlev H Krüger
- Institute of Virology, Helmut-Ruska-Haus, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| |
Collapse
|
5
|
Meyer B, Groseth A. Apoptosis during arenavirus infection: mechanisms and evasion strategies. Microbes Infect 2017; 20:65-80. [PMID: 29081359 DOI: 10.1016/j.micinf.2017.10.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 10/15/2017] [Accepted: 10/16/2017] [Indexed: 11/17/2022]
Abstract
In recent years there has been a greatly increased interest in the interactions of arenaviruses with the apoptotic machinery, and particularly the extent to which these interactions may be an important contributor to pathogenesis. Here we summarize the current state of our knowledge on this subject and address the potential for interplay with other immunological mechanisms known to be regulated by these viruses. We also compare and contrast what is known for arenavirus-induced apoptosis with observations from other segmented hemorrhagic fever viruses.
Collapse
Affiliation(s)
- Bjoern Meyer
- Viral Populations and Pathogenesis Unit, Institut Pasteur, 28 rue du Dr. Roux, 75724 Paris cedex 15, France.
| | - Allison Groseth
- Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald - Insel Riems, Germany
| |
Collapse
|
6
|
Host Responses and Regulation by NFκB Signaling in the Liver and Liver Epithelial Cells Infected with A Novel Tick-borne Bunyavirus. Sci Rep 2015; 5:11816. [PMID: 26134299 PMCID: PMC4488873 DOI: 10.1038/srep11816] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 05/26/2015] [Indexed: 12/22/2022] Open
Abstract
Infection in humans by severe fever with thrombocytopenia syndrome virus (SFTSV), a novel bunyavirus transmitted by ticks, is often associated with pronounced liver damage, especially in fatal cases. Little has been known, however, about how liver cells respond to SFTSV and how the response is regulated. In this study we report that proinflammatory cytokines were induced in liver tissues of C57/BL6 mice infected with SFTSV, which may cause tissue necrosis in mice. Human liver epithelial cells were susceptible to SFTSV and antiviral interferon (IFN) and IFN-inducible proteins were induced upon infection. We observed that infection of liver epithelial cells led to significant increases in proinflammatory cytokines and chemokines, including IL-6, RANTES, IP-10, and MIP-3a, which were regulated by NFκB signaling, and the activation of NFκB signaling during infection promoted viral replication in liver epithelial cells. Viral nonstructural protein NSs was inhibitory to the induction of IFN-β, but interestingly, NFκB activation was enhanced in the presence of NSs. Therefore, NSs plays dual roles in the suppression of antiviral IFN-β induction as well as the promotion of proinflammatory responses. Our findings provide the first evidence for elucidating host responses and regulation in liver epithelial cells infected by an emerging bunyavirus.
Collapse
|
7
|
Abstract
Emerging infectious diseases of zoonotic origin are shaping today's infectious disease field more than ever. In this article, we introduce and review three emerging zoonotic viruses. Novel hantaviruses emerged in the Americas in the mid-1990s as the cause of severe respiratory infections, designated hantavirus pulmonary syndrome, with case fatality rates of around 40%. Nipah virus emerged a few years later, causing respiratory infections and encephalitis in Southeast Asia, with case fatality rates ranging from 40% to more than 90%. A new coronavirus emerged in 2012 on the Arabian Peninsula with a clinical syndrome of acute respiratory infections, later designated as Middle East respiratory syndrome (MERS), and an initial case fatality rate of more than 40%. Our current state of knowledge on the pathogenicity of these three severe, emerging viral infections is discussed.
Collapse
Affiliation(s)
- David Safronetz
- Laboratory of Virology, Division of Intramural Research, Rocky Mountain Laboratories, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana; , ,
| | | | | |
Collapse
|
8
|
Mustonen J, Mäkelä S, Outinen T, Laine O, Jylhävä J, Arstila PT, Hurme M, Vaheri A. The pathogenesis of nephropathia epidemica: new knowledge and unanswered questions. Antiviral Res 2013; 100:589-604. [PMID: 24126075 DOI: 10.1016/j.antiviral.2013.10.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 09/27/2013] [Accepted: 10/04/2013] [Indexed: 01/20/2023]
Abstract
Puumala virus (PUUV) causes an acute hemorrhagic fever with renal syndrome (HFRS), a zoonosis also called nephropathia epidemica (NE). The reservoir host of PUUV is the bank vole (Myodes glareolus). Herein we review the main clinical manifestations of NE, acute kidney injury, increased vascular permeability, coagulation abnormalities as well as pulmonary, cardiac, central nervous system and ocular manifestations of the disease. Several biomarkers of disease severity have recently been discovered: interleukin-6, pentraxin-3, C-reactive protein, indoleamine 2,3-dioxygenase, cell-free DNA, soluble urokinase-type plasminogen activator, GATA-3 and Mac-2 binding protein. The role of cytokines, vascular endothelial growth hormone, complement, bradykinin, cellular immune response and other mechanisms in the pathogenesis of NE as well as host genetic factors will be discussed. Finally therapeutic aspects and directions for further research will be handled.
Collapse
Affiliation(s)
- Jukka Mustonen
- School of Medicine, University of Tampere, Tampere, Finland; Department of Internal Medicine, Tampere University Hospital, Tampere, Finland.
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Park SW, Han MG, Park C, Ju YR, Ahn BY, Ryou J. Hantaan virus nucleocapsid protein stimulates MDM2-dependent p53 degradation. J Gen Virol 2013; 94:2424-2428. [PMID: 23994832 DOI: 10.1099/vir.0.054312-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Apoptosis has been shown to be induced and downregulated by the Hantaan virus (HTNV) nucleocapsid (N) protein. To address these conflicting data, expression of the p53 protein, one of the key molecules involved in apoptosis, was assessed in the presence of the N protein in A549 and HeLa cells. The amount of p53, increased by drug treatment, was reduced when cells were infected with HTNV or transfected with an expression vector of the HTNV N protein. When cells were treated with a proteasome inhibitor (MG132) or an MDM2 antagonist (Nutlin-3), p53 expression was not reduced in N protein-overexpressed cells. We concluded that the HTNV N protein ubiquitinates and degrades p53 MDM2-dependently. Here we report downregulation of p53 expression through a post-translational mechanism: MDM2-dependent ubiquitination and degradation by the HTNV N protein. These results indicate that N protein-dependent p53 degradation through the ubiquitin proteasome system is one of the anti-apoptotic mechanisms employed by HTNV.
Collapse
Affiliation(s)
- Sun-Whan Park
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
- Division of Arboviruses, Center for Immunology & Pathology, National Institute of Health, Korea Centers for Disease Control & Prevention, Republic of Korea
| | - Myung-Guk Han
- Division of Arboviruses, Center for Immunology & Pathology, National Institute of Health, Korea Centers for Disease Control & Prevention, Republic of Korea
| | - Chan Park
- Division of Arboviruses, Center for Immunology & Pathology, National Institute of Health, Korea Centers for Disease Control & Prevention, Republic of Korea
| | - Young Ran Ju
- Division of Zoonoses, Center for Immunology & Pathology, National Institute of Health, Korea Centers for Disease Control & Prevention, Republic of Korea
| | - Byung-Yoon Ahn
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
| | - Jungsang Ryou
- Division of Arboviruses, Center for Immunology & Pathology, National Institute of Health, Korea Centers for Disease Control & Prevention, Republic of Korea
| |
Collapse
|
10
|
Walter CT, Barr JN. Recent advances in the molecular and cellular biology of bunyaviruses. J Gen Virol 2011; 92:2467-2484. [PMID: 21865443 DOI: 10.1099/vir.0.035105-0] [Citation(s) in RCA: 141] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The family Bunyaviridae of segmented, negative-stranded RNA viruses includes over 350 members that infect a bewildering variety of animals and plants. Many of these bunyaviruses are the causative agents of serious disease in their respective hosts, and are classified as emerging viruses because of their increased incidence in new populations and geographical locations throughout the world. Emerging bunyaviruses, such as Crimean-Congo hemorrhagic fever virus, tomato spotted wilt virus and Rift Valley fever virus, are currently attracting great interest due to migration of their arthropod vectors, a situation possibly linked to climate change. These and other examples of continued emergence suggest that bunyaviruses will probably continue to pose a sustained global threat to agricultural productivity, animal welfare and human health. The threat of emergence is particularly acute in light of the lack of effective preventative or therapeutic treatments for any of these viruses, making their study an important priority. This review presents recent advances in the understanding of the bunyavirus life cycle, including aspects of their molecular, cellular and structural biology. Whilst special emphasis is placed upon the emerging bunyaviruses, we also describe the extensive body of work involving model bunyaviruses, which have been the subject of major contributions to our overall understanding of this important group of viruses.
Collapse
Affiliation(s)
- Cheryl T Walter
- Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire LS2 9JT, UK
| | - John N Barr
- Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire LS2 9JT, UK
| |
Collapse
|
11
|
Karlberg H, Tan YJ, Mirazimi A. Induction of caspase activation and cleavage of the viral nucleocapsid protein in different cell types during Crimean-Congo hemorrhagic fever virus infection. J Biol Chem 2010; 286:3227-34. [PMID: 21123175 DOI: 10.1074/jbc.m110.149369] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Regulation of apoptosis during infection has been observed for several viral pathogens. Programmed cell death and regulation of apoptosis in response to a viral infection are important factors for host or virus survival. It is not known whether Crimean-Congo hemorrhagic fever virus (CCHFV) infection regulates the apoptosis process in vitro. This study for the first time suggests that CCHFV induces apoptosis, which may be dependent on caspase-3 activation. This study also shows that the coding sequence of the S segment of CCHFV contains a proteolytic cleavage site, DEVD, which is conserved in all CCHFV strains. By using different recombinant expression systems and site-directed mutagenesis, we demonstrated that this motif is subject to caspase cleavage. We also demonstrate that CCHFV nucleocapsid protein (NP) is cleaved into a 30-kDa fragment at the same time as caspase activity is induced during infection. Using caspase inhibitors and cells lacking caspase-3, we clearly demonstrate that the cleavage of NP is caspase-3-dependent. We also show that the inhibition of apoptosis induced progeny viral titers of ∼80-90%. Thus, caspase-3-dependent cleavage of NP may represent a host defense mechanism against lytic CCHFV infection. Taken together, these data suggest that the most abundant protein of CCHFV, which has several essential functions such as protection of viral RNA and participation in various processes in the replication cycle, can be subjected to cleavage by host cell caspases.
Collapse
Affiliation(s)
- Helen Karlberg
- Swedish Institute for Infectious Disease control, SE-171 82 Solna, Sweden
| | | | | |
Collapse
|
12
|
|
13
|
Acrani GO, Gomes R, Proença-Módena JL, da Silva AF, Oliveira Carminati P, Silva ML, Santos RIM, Arruda E. Apoptosis induced by Oropouche virus infection in HeLa cells is dependent on virus protein expression. Virus Res 2010; 149:56-63. [DOI: 10.1016/j.virusres.2009.12.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 12/19/2009] [Accepted: 12/22/2009] [Indexed: 01/31/2023]
|
14
|
Ontiveros SJ, Li Q, Jonsson CB. Modulation of apoptosis and immune signaling pathways by the Hantaan virus nucleocapsid protein. Virology 2010; 401:165-78. [PMID: 20227103 DOI: 10.1016/j.virol.2010.02.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Revised: 12/12/2009] [Accepted: 02/10/2010] [Indexed: 01/23/2023]
Abstract
Herein, we show a direct relationship between the Hantaan virus (HTNV) nucleocapsid (N) protein and the modulation of apoptosis. We observed an increase in caspase-7 and -8, but not -9 in cells expressing HTNV N protein mutants lacking amino acids 270-330. Similar results were observed for the New World hantavirus, Andes virus. Nuclear factor kappa B (NF-kappaB) was sequestered in the cytoplasm after tumor necrosis factor receptor (TNFR) stimulation in cells expressing HTNV N protein. Further, TNFR stimulated cells expressing HTNV N protein inhibited caspase activation. In contrast, cells expressing N protein truncations lacking the region from amino acids 270-330 were unable to inhibit nuclear import of NF-kappaB and the mutants also triggered caspase activity. These results suggest that the HTNV circumvents host antiviral signaling and apoptotic response mediated by the TNFR pathway through host interactions with the N protein.
Collapse
Affiliation(s)
- Steven J Ontiveros
- Graduate Program in Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | | | | |
Collapse
|
15
|
Kang JI, Kim JP, Wakita T, Ahn BY. Cell culture-adaptive mutations in the NS5B gene of hepatitis C virus with delayed replication and reduced cytotoxicity. Virus Res 2009; 144:107-16. [DOI: 10.1016/j.virusres.2009.04.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2009] [Revised: 04/04/2009] [Accepted: 04/07/2009] [Indexed: 12/13/2022]
|
16
|
Apoptosis in murine norovirus-infected RAW264.7 cells is associated with downregulation of survivin. J Virol 2009; 83:3647-56. [PMID: 19211757 DOI: 10.1128/jvi.02028-08] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Noroviruses (NVs) are recognized as a major cause of nonbacterial gastroenteritis in humans. Studies of the human NVs continue to be hampered by the inability to propagate them in any cell culture system. Until recently, most data concerning NV replication were derived from studies of feline calicivirus and rabbit hemorrhagic disease virus, which are cultivable members of the family Caliciviridae. From such studies, it was proposed that caliciviruses induce apoptosis to facilitate the dissemination of viral progeny in the host. The discovery that MNV type 1 (MNV-1) grows in RAW264.7 cells provided the first cell culture system for use in studying the role of apoptosis in NV infection. We first showed that MNV-1 replication triggered apoptosis in infected RAW264.7 cells and then demonstrated that cell death was associated with activation of caspase-9 and caspase-3 through the mitochondrial pathway. This process was dependent on virus replication, since inactivated virus failed to induce signs of apoptosis. In order to better understand the apoptotic process induced by MNV-1 infection of RAW264.7 cells, we investigated the expression profiles of MNV-1-infected versus mock-infected cells. Survivin, a member of the inhibitor of apoptosis protein family, was found to be significantly downregulated in an inverse relationship with the virus genome replication. This study showed that, unlike other viruses that upregulate survivin, MNV-1 is the first virus found to downregulate the levels of survivin. We observed that MNV-1 replication in RAW264.7 cells activated caspases, resulting in apoptosis through the mitochondrial pathway, possibly as a result of downregulation of survivin.
Collapse
|
17
|
Choi Y, Kwon YC, Kim SI, Park JM, Lee KH, Ahn BY. A hantavirus causing hemorrhagic fever with renal syndrome requires gC1qR/p32 for efficient cell binding and infection. Virology 2008; 381:178-83. [PMID: 18834607 DOI: 10.1016/j.virol.2008.08.035] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Revised: 06/09/2008] [Accepted: 08/19/2008] [Indexed: 11/18/2022]
Abstract
Hantaan virus (HTNV) is a pathogenic hantavirus that causes hemorrhagic fever with renal syndrome (HFRS). HTNV infection is mediated by alpha v beta3 integrin. We used protein blots of Vero E6 cell homogenates to demonstrate that radiolabeled HTNV virions bind to gC1qR/p32, the acidic 32-kDa protein known as the receptor for the globular head domain of complement C1q. RNAi-mediated suppression of gC1qR/p32 markedly reduced HTNV binding and infection in human lung epithelial A549 cells. Conversely, transient expression of either simian or human gC1qR/p32 rendered non-permissive CHO cells susceptible to HTNV infection. These results suggest an important role for gC1qR/p32 in HTNV infection and pathogenesis.
Collapse
Affiliation(s)
- Yun Choi
- Mogam Research Institute, 341 Pojungdong, Yongin, 449-910, Republic of Korea
| | | | | | | | | | | |
Collapse
|
18
|
Xu F, Liang X, Tesh RB, Xiao SY. Characterization of cell-death pathways in Punta Toro virus-induced hepatocyte injury. J Gen Virol 2008; 89:2175-2181. [PMID: 18753227 DOI: 10.1099/vir.0.2008/001644-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Punta Toro virus (PTV; genus Phlebovirus, family Bunyaviridae) causes apoptosis of hepatocytes in vivo in experimentally infected hamsters and in vitro in cultured HepG2 cells. Screening for expression of apoptosis-related genes has shown alterations in the genes for tumour necrosis factor-alpha (TNF-alpha) and the TNF receptor family. This study examined the roles of the TNF receptor-related extrinsic pathway and the Bcl-2 family-associated mitochondrial pathway in PTV-induced cell death. The effects of caspase inhibitors (caspIs) and TNF on cellular viability, virus replication, and morphological and biochemical changes in apoptosis were examined in HepG2 cells at different time points after infection with PTV (Adames strain). The results showed that caspIs dampened the virus-induced reduction in cellular viability, partially suppressed and delayed viral titres and antigen expression, and partially decreased the expression of apoptotic genes, caspase activities and DNA fragmentation. TNF treatment further decreased cellular viability after PTV infection and increased the level of apoptosis, whilst caspIs partially inhibited these effects. These findings indicate that TNF, caspase-8 and caspase-9 contribute to PTV-induced hepatocytic apoptosis and that additional mediators are probably also involved in this process. These mediators from different pathways correlated with one another and may be interlinked.
Collapse
Affiliation(s)
- Fangling Xu
- Department of Pathology and Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, TX, USA
| | - Xiaodong Liang
- Department of Pathology and Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, TX, USA
| | - Robert B Tesh
- Department of Pathology and Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, TX, USA
| | - Shu-Yuan Xiao
- Department of Pathology and Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, TX, USA
| |
Collapse
|
19
|
Strandin T, Hepojoki J, Wang H, Vaheri A, Lankinen H. Hantaviruses and TNF-alpha act synergistically to induce ERK1/2 inactivation in Vero E6 cells. Virol J 2008; 5:110. [PMID: 18822184 PMCID: PMC2569924 DOI: 10.1186/1743-422x-5-110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Accepted: 09/29/2008] [Indexed: 01/09/2023] Open
Abstract
Background We have previously reported that the apathogenic Tula hantavirus induces apoptosis in Vero E6 epithelial cells. To assess the molecular mechanisms behind the induced apoptosis we studied the effects of hantavirus infection on cellular signaling pathways which promote cell survival. We previously also observed that the Tula virus-induced cell death process is augmented by external TNF-α. Since TNF-α is involved in the pathogenesis of hantavirus-caused hemorrhagic fever with renal syndrome (HFRS) we investigated its effects on HFRS-causing hantavirus-infected cells. Results We studied both apathogenic (Tula and Topografov) and pathogenic (Puumala and Seoul) hantaviruses for their ability to regulate cellular signaling pathways and observed a direct virus-mediated down-regulation of external signal-regulated kinases 1 and 2 (ERK1/2) survival pathway activity, which was dramatically enhanced by TNF-α. The fold of ERK1/2 inhibition correlated with viral replication efficiencies, which varied drastically between the hantaviruses studied. Conclusion We demonstrate that in the presence of a cytokine TNF-α, which is increased in HFRS patients, hantaviruses are capable of inactivating proteins that promote cell survival (ERK1/2). These results imply that hantavirus-infected epithelial cell barrier functions might be compromised in diseased individuals and could at least partially explain the mechanisms of renal dysfunction and the resulting proteinuria seen in HFRS patients.
Collapse
Affiliation(s)
- Tomas Strandin
- Department of Virology, Haartman Institute, P,O, Box 21, FI-00014, University of Helsinki, Finland.
| | | | | | | | | |
Collapse
|
20
|
Terajima M, Hayasaka D, Maeda K, Ennis FA. Immunopathogenesis of hantavirus pulmonary syndrome and hemorrhagic fever with renal syndrome: Do CD8+ T cells trigger capillary leakage in viral hemorrhagic fevers? Immunol Lett 2007; 113:117-20. [PMID: 17897725 PMCID: PMC2214668 DOI: 10.1016/j.imlet.2007.08.003] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2007] [Accepted: 08/18/2007] [Indexed: 12/23/2022]
Abstract
There are many viruses known to cause viral hemorrhagic fevers in humans. The mechanisms causing hemorrhage are likely to vary among viruses. Some viruses, such as Marburg virus, are directly cytopathic to infected endothelial cells, suggesting infection of endothelial cells alone can cause hemorrhage. On the other hand, there are viruses which infect endothelial cells without causing any cytopathic effects, suggesting the involvement of host immune responses in developing hemorrhage. Typical examples of these include viruses of the hantavirus species. We hypothesize that impairment of endothelial cell's defense mechanisms against cytotoxic CD8+ T cells is the mechanism of capillary leakage in hantavirus pulmonary syndrome and hemorrhagic fever with renal syndrome, which may be common to other viral hemorrhagic fevers. CD8+ T cells may be a potential target for therapy of some viral hemorrhagic fevers.
Collapse
|
21
|
Wahl-Jensen V, Chapman J, Asher L, Fisher R, Zimmerman M, Larsen T, Hooper JW. Temporal analysis of Andes virus and Sin Nombre virus infections of Syrian hamsters. J Virol 2007; 81:7449-62. [PMID: 17475651 PMCID: PMC1933362 DOI: 10.1128/jvi.00238-07] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Andes virus (ANDV) and Sin Nombre virus (SNV) are rodent-borne hantaviruses that cause a highly lethal hemorrhagic fever in humans known as hantavirus pulmonary syndrome (HPS). There are no vaccines or specific drugs to prevent or treat HPS, and the pathogenesis is not understood. Syrian hamsters infected with ANDV, but not SNV, develop a highly lethal disease that closely resembles HPS in humans. Here, we performed a temporal pathogenesis study comparing ANDV and SNV infections in hamsters. SNV was nonpathogenic and viremia was not detected despite the fact that all animals were infected. ANDV was uniformly lethal with a mean time to death of 11 days. The first pathology detected was lymphocyte apoptosis starting on day 4. Animals were viremic and viral antigen was first observed in multiple organs by days 6 and 8, respectively. Levels of infectious virus in the blood increased 4 to 5 logs between days 6 and 8. Pulmonary edema was first detected ultrastructurally on day 6. Ultrastructural analysis of lung tissues revealed the presence of large inclusion bodies and substantial numbers of vacuoles within infected endothelial cells. Paraendothelial gaps were not observed, suggesting that fluid leakage was transcellular and directly attributable to infecting virus. Taken together, these data imply that HPS treatment strategies aimed at preventing virus replication and dissemination will have the greatest probability of success if administered before the viremic phase; however, because vascular leakage is associated with infected endothelial cells, a therapeutic strategy targeting viral replication might be effective even at later times (e.g., after disease onset).
Collapse
Affiliation(s)
- Victoria Wahl-Jensen
- Virology Division, U.S. Army Medical Research Institute of Infectious Deseases, Fort Detrick, MD 21702, USA
| | | | | | | | | | | | | |
Collapse
|
22
|
Hayasaka D, Maeda K, Ennis FA, Terajima M. Increased permeability of human endothelial cell line EA.hy926 induced by hantavirus-specific cytotoxic T lymphocytes. Virus Res 2006; 123:120-7. [PMID: 16979772 DOI: 10.1016/j.virusres.2006.08.006] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2006] [Revised: 08/14/2006] [Accepted: 08/16/2006] [Indexed: 12/27/2022]
Abstract
Hantavirus infection causes two human diseases, hemorrhagic fever with renal syndrome and hantavirus pulmonary syndrome. The typical feature of these diseases is increased permeability in microvascular beds in the kidneys and the lungs, respectively. The mechanism of capillary leakage, however, is not understood. Some evidence suggests that hantavirus disease pathogenesis is immunologically mediated by cytotoxic T lymphocytes and other immune cells in target organs producing inflammatory cytokines. In this study we examined the roles of virus-specific cytotoxic T lymphocytes in increased permeability of human endothelial cells infected with hantavirus. We used a human CD8(+) hantavirus-specific cytotoxic T lymphocyte line, 1A-E2, specific for the HLA-A24-restricted epitope in Sin Nombre and Puumala virus G2 protein, and the human endothelial cell line, EA.hy926 that expresses HLA-A24 molecule. The cytotoxic T lymphocyte line recognized and lysed target cells infected with Sin Nombre virus, and in transwell permeability assays increased permeability of EA.hy926 cell monolayer infected with Sin Nombre virus or recombinant adenovirus expressing the Sin Nombre virus G2 protein. These results suggest that cytotoxic T lymphocyte activity contribute to capillary leakage observed in patients with hantavirus pulmonary syndrome or hemorrhagic fever with renal syndrome.
Collapse
Affiliation(s)
- Daisuke Hayasaka
- Center for Infectious Disease and Vaccine Research, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655, USA
| | | | | | | |
Collapse
|
23
|
Liu JM, Zhu Y, Xu ZW, Ouyang WM, Wang JP, Liu XS, Cao YX, Li Q, Fang L, Zhuang R, Yang AG, Jin BQ. Dynamic changes of apoptosis-inducing ligands and Th1/Th2 like subpopulations in Hantaan virus-induced hemorrhagic fever with renal syndrome. Clin Immunol 2006; 119:245-51. [PMID: 16616877 DOI: 10.1016/j.clim.2006.02.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2005] [Revised: 01/21/2006] [Accepted: 02/28/2006] [Indexed: 01/10/2023]
Abstract
The expression of the apoptosis-inducing ligands, TNF-alpha, FasL and TRAIL on peripheral blood mononuclear cells (PBMC) and the levels of their soluble form (TNF-alpha, sFasL and sTRAIL) in plasma from 40 hemorrhagic fever with renal syndrome (HFRS) patients as well as 26 healthy blood donors were determined by flow cytometry (FCM) analysis and sandwich ELISA, respectively. The status of Th1, Th2, Tc1 and Tc2 subsets in PBMC was evaluated by intracellular cytokine staining and FCM. Compared to controls, the expression of membrane bound FasL and TRAIL was up-regulated on surface of PBMC isolated from the HFRS patients, particularly on CD8+ T lymphocytes. The levels of TNF-alpha, sFasL and sTRAIL in plasma from the HFRS patients in the acute phase increase 4.7-fold, 6.0-fold and 1.8-fold, respectively, over those from the healthy donors. The percentage of Th1, Tc1 and Tc2 subsets in PBMC from the patients also increased significantly compared with those from healthy donors. These results indicate that dynamic changes occurred in both the membrane bound and soluble forms of apoptosis-inducing ligands (FasL, TRAIL and TNF-alpha) and proportions of Th1 and CTL in HFRS patients increased. Both factors may play an important role in the etiology of Hantaan virus infection in humans.
Collapse
Affiliation(s)
- Jing-Mei Liu
- Department of Immunology, Fourth Military Medical University, Xi'an, China
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Ding X, Xu F, Chen H, Tesh RB, Xiao SY. Apoptosis of hepatocytes caused by Punta Toro virus (Bunyaviridae: Phlebovirus) and its implication for Phlebovirus pathogenesis. THE AMERICAN JOURNAL OF PATHOLOGY 2005; 167:1043-9. [PMID: 16192639 PMCID: PMC1603669 DOI: 10.1016/s0002-9440(10)61193-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Experimental infection of hamsters with Punta Toro virus (PTV) produces a disease with clinical and pathological similarities to the severe human hemorrhagic fever caused by Rift Valley fever virus (RVFV), thus providing an animal model for RVFV pathogenesis. In this model, hepatocytic apoptosis is the main pathological component of liver injuries that are responsible for severe hemorrhagic manifestations. To further elucidate whether viral replication in hepatocytes directly causes apoptosis, we studied the morphological and biochemical changes of apoptosis in HepG2 cells at different time points after PTV infection. Cellular viability began to decrease 12 hours after infection compared with controls. Caspases 3/7 were activated significantly at 48 and 72 hours after infection, and phosphatidylserine translocation and DNA fragmentation were also detected at 48 and 72 hours. Cell cycle analysis by flow cytometry showed that infected HepG2 cells were arrested at G(0)/G(1) phase. Furthermore, virus titer increased with apoptosis progression, suggesting that viral replication is necessary for the apoptotic process. These results indicate that PTV infection alone, without a secondary inflammatory cellular reaction, induces hepatocytic apoptosis and suggest that future therapeutics for RVFV hemorrhagic disease might target inhibition of cellular apoptotic pathways during the acute infection.
Collapse
Affiliation(s)
- Xiaohua Ding
- Department of Pathology, University of Texas Medical Branch, 301 University Blvd., Galveston, TX 77555-0588, USA
| | | | | | | | | |
Collapse
|
25
|
Affiliation(s)
- Walter Muranyi
- Klinikum der Universität Heidelberg, Sektion Nephrologie, Heidelberg, Germany
| | | | | | | |
Collapse
|
26
|
Kallio-Kokko H, Uzcategui N, Vapalahti O, Vaheri A. Viral zoonoses in Europe. FEMS Microbiol Rev 2005; 29:1051-77. [PMID: 16024128 PMCID: PMC7110368 DOI: 10.1016/j.femsre.2005.04.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2004] [Revised: 04/11/2005] [Accepted: 04/19/2005] [Indexed: 12/19/2022] Open
Abstract
A number of new virus infections have emerged or re-emerged during the past 15 years. Some viruses are spreading to new areas along with climate and environmental changes. The majority of these infections are transmitted from animals to humans, and thus called zoonoses. Zoonotic viruses are, as compared to human-only viruses, much more difficult to eradicate. Infections by several of these viruses may lead to high mortality and also attract attention because they are potential bio-weapons. This review will focus on zoonotic virus infections occurring in Europe.
Collapse
Affiliation(s)
- Hannimari Kallio-Kokko
- Haartman Institute, Department of Virology, University of Helsinki, POB 21, 00014 Helsinki, Finland.
| | | | | | | |
Collapse
|
27
|
Ren L, Yang R, Guo L, Qu J, Wang J, Hung T. Apoptosis induced by the SARS-associated coronavirus in Vero cells is replication-dependent and involves caspase. DNA Cell Biol 2005; 24:496-502. [PMID: 16101347 DOI: 10.1089/dna.2005.24.496] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The pathogenesis of the severe acute respiratory syndrome (SARS), a newly emerging life-threatening disease in humans, remains unknown. It is believed that the modulation of apoptosis is relevant to diseases that are caused by various viruses. To examine potential apoptotic mechanisms related to SARS, we investigated features of apoptosis induced by the SARS-associated coronavirus (SARS-CoV) in host cells. The results indicated that the SARS-CoV-induced apoptosis in Vero cells in a virus replication-dependent manner. Additionally, the downregulation of Bcl-2, the activation of casapse 3, as well as the upregulation of Bax were detected, suggesting the involvement of the caspase family and the activation of the mitochondrial signaling pathway. Although there is a positive correlation between apoptosis and virus replication, the latter is not significantly blocked by treatment with the caspase inhibitor z-DEVD-FMK. These preliminary data provide important information on both the pathogenesis and potential antiviral targets of SARS-CoV.
Collapse
Affiliation(s)
- Lili Ren
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republicof China
| | | | | | | | | | | |
Collapse
|
28
|
Hardestam J, Klingström J, Mattsson K, Lundkvist A. HFRS causing hantaviruses do not induce apoptosis in confluent Vero E6 and A-549 cells. J Med Virol 2005; 76:234-40. [PMID: 15834879 DOI: 10.1002/jmv.20347] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Hantaviruses are known to cause little or no cytopathic effect in vitro, but have been suggested to cause apoptosis. To determine whether different hantaviruses would induce apoptosis to varying degrees, confluent Vero E6 cells were infected with the hemorrhagic fever with renal syndrome (HFRS) causing viruses Hantaan, Dobrava, Saaremaa, and Puumala. However, no difference was found in the percentage of adherent cells, or of cells with condensed nuclei, between non-infected and virus-infected cells at 3, 6, 9, or 12 days after infection. Furthermore, no differences in the percentage of cells with inter-nucleosomal cleavage of DNA between uninfected and Hantaan infected cells could be detected using the TUNEL assay. Possibly, slightly more apoptotic cells, but never more than 5%, were detected after Hantaan infection of non-confluent cells as compared to the negative control. Earlier reported results that Tula hantavirus induces significant apoptosis on Vero E6 cells were also verified, suggesting that non-pathogenic hantaviruses might differ from HFRS-causing strains regarding induction of apoptosis. In conclusion, the results indicated that the HFRS-causing hantaviruses might induce a very low level of apoptosis in dividing cells, but not at all in confluent cells.
Collapse
Affiliation(s)
- Jonas Hardestam
- Swedish Institute for Infectious Disease Control, Solna, Sweden
| | | | | | | |
Collapse
|
29
|
Kaukinen P, Vaheri A, Plyusnin A. Hantavirus nucleocapsid protein: a multifunctional molecule with both housekeeping and ambassadorial duties. Arch Virol 2005; 150:1693-713. [PMID: 15931462 DOI: 10.1007/s00705-005-0555-4] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2005] [Accepted: 04/12/2005] [Indexed: 01/10/2023]
Abstract
In recent years important progress has been made studying the nucleocapsid (N) protein of hantaviruses. The N protein presents a good example of a multifunctional viral macromolecule. It is a major structural component of a virion that encapsidates viral RNA (vRNA). It also interacts with the virus polymerase (L protein) and one of the glycoproteins. On top of these "house keeping" duties, the N protein performs interactive "ambassadorial" functions interfering with important regulatory pathways in the infected cells.
Collapse
Affiliation(s)
- P Kaukinen
- Department of Virology, Haartman Institute, University of Helsinki, Finland
| | | | | |
Collapse
|
30
|
Li XD, Lankinen H, Putkuri N, Vapalahti O, Vaheri A. Tula hantavirus triggers pro-apoptotic signals of ER stress in Vero E6 cells. Virology 2005; 333:180-9. [PMID: 15708603 PMCID: PMC7173054 DOI: 10.1016/j.virol.2005.01.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2004] [Revised: 12/01/2004] [Accepted: 01/03/2005] [Indexed: 12/29/2022]
Abstract
Tula virus is a member of the Hantavirus genus of the family Bunyaviridae. Viruses of this family have an unusual pattern of intracellular maturation at the ER–Golgi compartment. We recently found that Tula virus, similar to several other hantaviruses, is able to induce apoptosis in cultured cells [Li, X.D., Kukkonen, S., Vapalahti, O., Plyusnin, A., Lankinen, H., Vaheri, A., 2004. Tula hantavirus infection of Vero E6 cells induces apoptosis involving caspase 8 activation. J. Gen. Virol. 85, 3261–3268.]. However, the cellular mechanisms remain to be clarified. In this study, we demonstrate that the progressive replication of Tula virus in Vero E6 cells initiates several death programs that are intimately associated with ER stress: (1) early activation of ER-resident caspase-12; (2) phosphorylation of Jun NH2-terminal kinase (JNK) and its downstream target transcriptional factor, c-jun; (3) induction of the pro-apoptotic transcriptional factor, growth arrest- and DNA damage-inducible gene 153, or C/EBP homologous protein (Gadd153/chop); and (4) changes in the ER-membrane protein BAP31 implying cross-talk with the mitochondrial apoptosis pathway. Furthermore, we confirmed that a sustained ER stress was induced marked by an increased expression of an ER chaperone Grp78/BiP. Taken together, we have identified involvement of ER stress-mediated death program in Tula virus-infected Vero E6 cells which provides a new approach to understand the mechanisms in hantavirus-induced apoptosis.
Collapse
|
31
|
Yan H, Xiao G, Zhang J, Hu Y, Yuan F, Cole DK, Zheng C, Gao GF. SARS coronavirus induces apoptosis in Vero E6 cells. J Med Virol 2004; 73:323-31. [PMID: 15170624 PMCID: PMC7166321 DOI: 10.1002/jmv.20094] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Severe acute respiratory syndrome (SARS) is an emerging infectious disease. Its etiological agent has been convincingly identified as a new member of family Coronaviridae (SARS‐CoV). It causes serious damage to the respiratory system yet the mechanism is not clear. Infection‐induced apoptosis or necrosis is suspected but no direct evidence for this yet exists. To date, Vero E6 cells are the only cell line that could be used to replicate the virus with obvious CPE (cytopathic effect) in vitro. It is known for some viruses (including members of family Coronaviridae) that CPE can be caused either by virus‐induced apoptosis (active death) or cell necrosis (passive death). In this study, we examined the apoptosis in the SARS‐CoV infected Vero E6 cells. Indeed, the results do show that the CPE was induced by apoptosis rather than necrosis, shown by typical DNA fragmentation, through the existence of apoptotic bodies and swollen mitochondria. This observation has some implications for the SARS‐CoV pathogenicity: SARS‐CoV does induce apoptosis in cell cultures and might have the same effect in vivo, responsible for the severe damage of the respiratory system. J. Med. Virol. 73:323–331, 2004. © 2004 Wiley‐Liss, Inc.
Collapse
Affiliation(s)
- Huimin Yan
- School of Life Sciences, Wuhan University, Wuhan, China
| | - Gengfu Xiao
- School of Life Sciences, Wuhan University, Wuhan, China
| | - Jiamin Zhang
- School of Life Sciences, Wuhan University, Wuhan, China
| | - Yuanyang Hu
- School of Life Sciences, Wuhan University, Wuhan, China
| | - Fang Yuan
- Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Oxford University, Oxford, United Kingdom
| | - David K. Cole
- Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Oxford University, Oxford, United Kingdom
| | - Congyi Zheng
- School of Life Sciences, Wuhan University, Wuhan, China
| | - George F. Gao
- Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Oxford University, Oxford, United Kingdom
| |
Collapse
|
32
|
Li XD, Kukkonen S, Vapalahti O, Plyusnin A, Lankinen H, Vaheri A. Tula hantavirus infection of Vero E6 cells induces apoptosis involving caspase 8 activation. J Gen Virol 2004; 85:3261-3268. [PMID: 15483239 DOI: 10.1099/vir.0.80243-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Hantaviruses are known to cause two severe human diseases: haemorrhagic fever with renal syndrome and hantavirus pulmonary syndrome. The mechanisms of pathogenesis of these two diseases are progressively becoming understood. Recently, two hantaviruses, Hantaan and Prospect Hill were reported to cause programmed cell death of Vero E6 cells. This study shows that Tula hantavirus (TULV) infection efficiently triggers an apoptotic programme in infected Vero E6 cells, and that the replication of TULV is required for the activation of caspase 3 and the cleavage of poly (ADP-ribose) polymerase, two molecular hallmarks of apoptosis. The enforced treatment of infected Vero E6 cells with tumour necrosis factor alpha (TNF-alpha), but not interferon alpha (IFN-alpha), advanced the time course of apoptosis. Furthermore, caspase 8 was activated on day 4 post-infection, the same day when caspase 3 was activated. TNF receptor 1 was induced during a late stage of TULV infection. These data suggest that, unlike during influenza A virus infection, TNF-alpha, but not type I IFN-alpha/beta, may contribute significantly to apoptosis in a synergistic manner with TULV propagation. Interestingly, pretreatment with a broad-spectrum caspase inhibitor, z-VAD-fmk, efficiently inhibited apoptosis of TULV-infected Vero E6 cells. Taken together, these results suggest that TULV replication initiates a typical apoptotic programme involving caspase 8 activation.
Collapse
Affiliation(s)
- Xiao-Dong Li
- Department of Virology, Haartman Institute, POB 21, FIN-00014 University of Helsinki, Finland
| | - Sami Kukkonen
- Department of Virology, Haartman Institute, POB 21, FIN-00014 University of Helsinki, Finland
| | - Olli Vapalahti
- Department of Virology, Haartman Institute, POB 21, FIN-00014 University of Helsinki, Finland
| | - Alexander Plyusnin
- Department of Virology, Haartman Institute, POB 21, FIN-00014 University of Helsinki, Finland
| | - Hilkka Lankinen
- Department of Virology, Haartman Institute, POB 21, FIN-00014 University of Helsinki, Finland
| | - Antti Vaheri
- Department of Virology, Haartman Institute, POB 21, FIN-00014 University of Helsinki, Finland
| |
Collapse
|
33
|
Du C, Zhang Q, Li C, Miao D, Gui J. Induction of apoptosis in a carp leucocyte cell line infected with turbot (Scophthalmus maximus L.) rhabdovirus. Virus Res 2004; 101:119-26. [PMID: 15041179 DOI: 10.1016/j.virusres.2003.12.034] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2003] [Revised: 12/17/2003] [Accepted: 12/17/2003] [Indexed: 10/26/2022]
Abstract
A rhabdovirus was observed from the diseased turbot (Scophthalmus maximus L.) with lethal syndrome. In this study, a carp leucocyte (CLC) cell line was used to investigate the infection process and cell death mechanism occurring during the virus infection. Strong cytopathogenic effect (CPE) and the morphological changes, such as extreme chromatin condensation, nucleus fragmentation, and apoptotic body formation, were observed under fluorescence microscopy after DAPI staining in the infected CLC cells. Transmission electron microscopy analysis showed cell shrinkage, plasma membrane blebbing, cytoplasm vacuolization, chromatin condensation, nuclear breakdown and formation of discrete apoptotic bodies. The bullet-shaped nucleocapsids were measured and ranged in size from 110 to 150 nm in length and 40 to 60 nm in diameter. And therefore the virus is called Scophthalmus maximus rhabdovirus (SMRV). Agarose gel electrophoresis analysis of the DNA extracted from infected cells showed typical DNA ladder in the course of SMRV infection. Flow cytometry analysis of SMRV infected CLC cells detected apoptotic peak in the virus infected CLC cells. Virus titre analysis and electron microscopic observation revealed that the virus replication fastigium was earlier than that of the apoptosis occurrence. No apoptosis was observed in the CLC infected with UV-inactivated SMRV. All these supported that SMRV infected CLC cells undergo apoptosis and the virus replication is necessary for apoptosis induction of CLC cells.
Collapse
Affiliation(s)
- Changsheng Du
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | | | | | | | | |
Collapse
|
34
|
Colón-Ramos DA, Irusta PM, Gan EC, Olson MR, Song J, Morimoto RI, Elliott RM, Lombard M, Hollingsworth R, Hardwick JM, Smith GK, Kornbluth S. Inhibition of translation and induction of apoptosis by Bunyaviral nonstructural proteins bearing sequence similarity to reaper. Mol Biol Cell 2003; 14:4162-72. [PMID: 14517326 PMCID: PMC207008 DOI: 10.1091/mbc.e03-03-0139] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2003] [Revised: 05/26/2003] [Accepted: 05/27/2003] [Indexed: 01/04/2023] Open
Abstract
Members of the California serogroup of bunyaviruses (family Bunyaviridae) are the leading cause of pediatric viral encephalitis in North America. Significant cell death is observed as part of the infection pathology. We now report that a Bunyaviral nonstructural protein termed NSs shows sequence similarity to Reaper, a proapoptotic protein from Drosophila. Although NSs proteins lack the Reaper N-terminal motif critical for IAP inhibition, they do retain other functions of Reaper that map to conserved C-terminal regions. Like Reaper, NSs proteins induce mitochondrial cytochrome c release and caspase activation in cell-free extracts and promote neuronal apoptosis and mortality in a mouse model. Independent of caspase activation, Bunyavirus NSs proteins also share with Reaper the ability to directly inhibit cellular protein translation. We have found that the shared capacity to inhibit translation and induce apoptosis resides in common sequence motifs present in both Reaper and NSs proteins. Data presented here suggest that NSs induce apoptosis through a mechanism similar to that used by Reaper, as both proteins bind to an apoptotic regulator called Scythe and can relieve Scythe inhibition of Hsp70. Thus, bunyavirus NSs proteins have multiple Reaper-like functions that likely contribute to viral pathogenesis by promoting cell death and/or inhibiting cellular translation.
Collapse
Affiliation(s)
- Daniel A Colón-Ramos
- Department of Pharmacology and Cancer Biology, C370 LSRC, Duke University Medical Center, Durham, North Carolina 27710, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Markotic A, Hensley L, Geisbert T, Spik K, Schmaljohn C. Hantaviruses induce cytopathic effects and apoptosis in continuous human embryonic kidney cells. J Gen Virol 2003; 84:2197-2202. [PMID: 12867652 DOI: 10.1099/vir.0.19090-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Hantaviruses are maintained in nature in persistently infected rodents and can also persistently infect cultured mammalian cells, causing little or no cytopathology. An unexpected outcome of this study was the observation of cytopathic effects (CPE) in the hantavirus-infected human embryonic kidney cell line HEK293. It was confirmed that hantaviruses induce apoptosis in HEK293 cells, although apoptosis appeared mostly in uninfected, bystander cells and rarely in infected HEK293 cells. Although studies by others suggest that the nucleocapsid protein of Puumala virus interacts with the Fas-mediated apoptosis enhancer Daxx at the gene expression level, it was determined that members of the TNF receptor superfamily did not contribute to the apoptosis observed in infected HEK293 cells. The observation of CPE in HEK293 cells might lead to a better understanding of the mechanisms of persistence and pathogenesis in hantavirus infections.
Collapse
Affiliation(s)
- A Markotic
- Department for Research and Development, Institute of Immunology, Zagreb, Croatia
| | - L Hensley
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, 1301 Ditto Ave, Fort Detrick, MD 21702, USA
| | - T Geisbert
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, 1301 Ditto Ave, Fort Detrick, MD 21702, USA
| | - K Spik
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, 1301 Ditto Ave, Fort Detrick, MD 21702, USA
| | - C Schmaljohn
- Virology Division, United States Army Medical Research Institute of Infectious Diseases, 1301 Ditto Ave, Fort Detrick, MD 21702, USA
| |
Collapse
|
36
|
Sosnovtsev SV, Prikhod'ko EA, Belliot G, Cohen JI, Green KY. Feline calicivirus replication induces apoptosis in cultured cells. Virus Res 2003; 94:1-10. [PMID: 12837551 DOI: 10.1016/s0168-1702(03)00115-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Infection of Crandell-Rees feline kidney (CRFK) cells by feline calicivirus (FCV) causes rapid cytopathic effects followed by cell death. In this study, we observed that FCV replication in cells results in the induction of changes characteristic of apoptosis, including translocation of phosphatidyl serine to the cell outer membrane, chromatin condensation, and oligonucleosomal DNA fragmentation. FCV infection was associated with increases in the activities of caspase-3, -8, and -9, with the level of activation of caspase-3 higher than those of caspases-8 and -9. Caspase activation in CRFK cells was not observed when cells were inoculated with UV-inactivated FCV or when cycloheximide was present during virus infection, indicating that FCV replication and de novo synthesis of virus proteins are critical for induction of apoptosis.
Collapse
Affiliation(s)
- Stanislav V Sosnovtsev
- Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 50 South Drive MSC8007, Building 50, Room 6316, Bethesda, MD 20892-8007, USA.
| | | | | | | | | |
Collapse
|
37
|
Kohl A, Clayton RF, Weber F, Bridgen A, Randall RE, Elliott RM. Bunyamwera virus nonstructural protein NSs counteracts interferon regulatory factor 3-mediated induction of early cell death. J Virol 2003; 77:7999-8008. [PMID: 12829839 PMCID: PMC161919 DOI: 10.1128/jvi.77.14.7999-8008.2003] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2003] [Accepted: 04/21/2003] [Indexed: 02/03/2023] Open
Abstract
The genome of Bunyamwera virus (BUN; family Bunyaviridae, genus Orthobunyavirus) consists of three segments of negative-sense RNA. The smallest segment, S, encodes two proteins, the nonstructural protein NSs, which is nonessential for viral replication and transcription, and the nucleocapsid protein N. Although a precise role in the replication cycle has yet to be attributed to NSs, it has been shown that NSs inhibits the induction of alpha/beta interferon, suggesting that it plays a part in counteracting the host antiviral defense. A defense mechanism to limit viral spread is programmed cell death by apoptosis. Here we show that a recombinant BUN that does not express NSs (BUNdelNSs) induces apoptotic cell death more rapidly than wild-type virus. Screening for apoptosis pathways revealed that the proapoptotic transcription factor interferon regulatory factor 3 (IRF-3) was activated by both wild-type BUN and BUNdelNSs infection, but only wild-type BUN was able to suppress signaling downstream of IRF-3. Studies with a BUN minireplicon system showed that active replication induced an IRF-3-dependent promoter, which was suppressed by the NSs protein. In a cell line (P2.1) defective in double-stranded RNA signaling due to low levels of IRF-3, induction of apoptosis was similar for wild-type BUN and BUNdelNSs. These data suggest that the BUN NSs protein can delay cell death in the early stages of BUN infection by inhibiting IRF-3-mediated apoptosis.
Collapse
Affiliation(s)
- Alain Kohl
- Division of Virology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G11 5JR, Scotland, United Kingdom
| | | | | | | | | | | |
Collapse
|
38
|
Chinchar VG, Bryan L, Wang J, Long S, Chinchar GD. Induction of apoptosis in frog virus 3-infected cells. Virology 2003; 306:303-12. [PMID: 12642103 DOI: 10.1016/s0042-6822(02)00039-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The ability of frog virus 3 (FV3), the type species of the family Iridoviridae, to induce apoptosis was examined by monitoring DNA cleavage, chromatin condensation, and cell-surface expression of phosphotidylserine (PS) in fathead minnow (FHM) and baby hamster kidney (BHK) cells. In productively infected FHM cells, DNA fragmentation was first noted at 6-7 h postinfection and was clearly seen by 17 h postinfection, while chromatin condensation was detected at 8.5 h postinfection. As with some other viruses, FV3-induced apoptosis did not require de novo viral gene expression as both heat-inactivated and UV-inactivated virus readily triggered DNA fragmentation in FHM cells. Moreover, FV3-induced apoptosis was blocked in FHM cells by the pan-caspase inhibitor Z-VAD-FMK, suggesting that virus infection triggers programmed cell death through activation of the caspase cascade. FV3 infection also triggered apoptosis in BHK cells as monitored by TUNEL and annexin V binding assays. To determine whether FV3, similar to other large DNA viruses, encoded proteins that block or delay apoptosis, mock- and FV3-infected FHM cells were osmotically shocked and assayed for DNA fragmentation 3 hours later. DNA fragmentation was clearly seen whether or not shocked cells were previously infected with FV3, indicating that infection with FV3 did not block apoptosis induced by osmotic shock in FHM cells. The above results demonstrate that iridoviruses triggered apoptosis and that the induction of programmed cell death did not require viral gene expression. However, it remains to be determined if virion attachment to target cells is sufficient to induce cell death, or if apoptosis is triggered directly or indirectly by one or more virion-associated proteins.
Collapse
Affiliation(s)
- V G Chinchar
- Department of Microbiology, University of Mississippi Medical Center, Jackson, MS 39216, USA.
| | | | | | | | | |
Collapse
|
39
|
Nam JH, Hwang KA, Yu CH, Kang TH, Shin JY, Choi WY, Kim IB, Joo YR, Cho HW, Park KY. Expression of interferon inducible genes following Hantaan virus infection as a mechanism of resistance in A549 cells. Virus Genes 2003; 26:31-8. [PMID: 12680691 DOI: 10.1023/a:1022373904357] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Hantaan virus (HTN) is a causative agent of hemorrhagic fever with renal syndrome (HFRS). Little is known of its pathogenesis or the molecular mechanisms underlying resistance to HTN infection. In the present study, DNA microarray technology was used to monitor changes in mRNA levels after HTN infection, to elucidate resistance mechanisms to viral infection by understanding virus-host interactions. We found that several interferon (IFN)-inducible genes were up-regulated in host cells infected with HTN. According to previous available data, IFNs have been reported to be inhibitory, but their mode of action has not been yet clear. In this study, the 2',5'-oligoadenylated synthetase (OAS) and Mx1 genes, not a double-stranded RNA-dependent protein kinase R (PKR), of the IFN response pathways are associated with antiviral activity during HTN infection. Furthermore, A549 cells treated with IFN-alpha were protected against HTN infection. Taken together, these results confirmed that IFN plays a role in cellular defenses against HTN infection at an early stage of the infection and revealed the resistance mechanism for HTN infection.
Collapse
Affiliation(s)
- Jae-Hwan Nam
- Department of Virology, Korean National Institute of Health, Seoul 122-701, Korea.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
Dendritic cells (DCs) play a pivotal role as antigen-presenting cells in the antiviral immune response. Here we show that Hantaan virus (HTNV), which belongs to the Bunyaviridae family (genus Hantavirus) and causes hemorrhagic fever with renal syndrome, productively infects human DCs in vitro. In the course of HTNV infection, DCs did not show any cytopathic effect and viral replication did not induce cell lysis or apoptosis. Furthermore, HTNV did not affect apoptosis-inducing signals that are important for the homeostatic control of mature DCs. In contrast to immunosuppressive viruses, e.g., human cytomegalovirus, HTNV activated immature DCs, resulting in upregulation of major histocompatibility complex (MHC), costimulatory, and adhesion molecules. Intriguingly, strong upregulation of MHC class I molecules and an increased intercellular cell adhesion molecule type 1 expression was also detected on HTNV-infected endothelial cells. In addition, antigen uptake by HTNV-infected DCs was reduced, another characteristic feature of DC maturation. Consistent with these findings, we observed that HTNV-infected DCs stimulated T cells as efficiently as did mature DCs. Finally, infection of DCs with HTNV induced the release of the proinflammatory cytokines tumor necrosis factor alpha and alpha interferon. Taken together, our findings indicate that hantavirus-infected DCs may significantly contribute to hantavirus-associated pathogenesis.
Collapse
Affiliation(s)
- Martin J Raftery
- Institute of Virology, Charité Medical School, Humboldt University Berlin, D-10098 Berlin, Germany
| | | | | | | | | |
Collapse
|
41
|
Li XD, Mäkelä TP, Guo D, Soliymani R, Koistinen V, Vapalahti O, Vaheri A, Lankinen H. Hantavirus nucleocapsid protein interacts with the Fas-mediated apoptosis enhancer Daxx. J Gen Virol 2002; 83:759-766. [PMID: 11907324 DOI: 10.1099/0022-1317-83-4-759] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Hantaviruses cause two severe diseases, haemorrhagic fever with renal syndrome in Eurasia and hantavirus pulmonary syndrome in the Americas. To understand more about the molecular mechanisms that lead to these diseases, the associations of Puumala virus nucleocapsid protein (PUUV-N) with cellular proteins were studied by yeast two-hybrid screening. Daxx, known as an apoptosis enhancer, was identified from a HeLa cDNA library and its interaction with PUUV-N was confirmed by GST pull-down assay, co-immunoprecipitation and co-localization studies. Furthermore, domains of interaction were mapped to the carboxyl-terminal region of 142 amino acids in Daxx and the carboxyl-terminal 57 residues in PUUV-N, respectively. In pepscan assays, the binding sites of Daxx to PUUV-N were mapped further to two lysine-rich regions, of which one overlaps the sequence of the predicted nuclear localization signal of Daxx. These data suggest a direct link between host cell machinery and a hantavirus structural component.
Collapse
Affiliation(s)
- Xiao-Dong Li
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| | - Tomi P Mäkelä
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| | - Deyin Guo
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| | - Rabah Soliymani
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| | - Vesa Koistinen
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| | - Olli Vapalahti
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| | - Antti Vaheri
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| | - Hilkka Lankinen
- Department of Virology1 and Department of Pathology2, Haartman Institute and HUCH Laboratory Diagnostics, and Institute of Biotechnology3, PO Box 21, Haartmaninkatu 3, FIN-00014 University of Helsinki, Finland
| |
Collapse
|
42
|
Jin M, Park J, Lee S, Park B, Shin J, Song KJ, Ahn TI, Hwang SY, Ahn BY, Ahn K. Hantaan virus enters cells by clathrin-dependent receptor-mediated endocytosis. Virology 2002; 294:60-9. [PMID: 11886265 DOI: 10.1006/viro.2001.1303] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The cellular entry of Hantaan virus (HTN) occurs through interactions with beta(3) integrins as cellular receptors. However, the process of HTN infection following attachment to the cell surface is not well understood. Our data indicate that overexpression of a dominant-negative mutant dynamin inhibits HTN internalization and that compounds that block clathrin- but not caveolae-dependent endocytosis also reduce HTN infectivity. In addition, we show that HTN colocalizes with the clathrin heavy chain but not with caveolae. At the early phase of infection HTN colocalizes with EEA-1, an early endosome marker, and later, HTN colocalizes with LAMP-1, a lysosome marker. Cells treated with lysosomotropic agents are largely resistant to infection, suggesting that a low-pH-dependent step is required for HTN infection. These findings demonstrate that HTN enters cells via the clathrin-coated pit pathway and uses low-pH-dependent intracellular compartments for infectious entry.
Collapse
Affiliation(s)
- Mirim Jin
- Division of Life Science and Graduate School of Biotechnology, Korea University, 1, 5-ka, Anam-Dong, Sungbuk-Gu, Seoul 136-701, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|