1
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Embry A, Gammon DB. Abortive Infection of Animal Cells: What Goes Wrong. Annu Rev Virol 2024; 11:193-213. [PMID: 38631917 PMCID: PMC11427174 DOI: 10.1146/annurev-virology-100422-023037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
Even if a virus successfully binds to a cell, defects in any of the downstream steps of the viral life cycle can preclude the production of infectious virus particles. Such abortive infections are likely common in nature and can provide fundamental insights into the cell and host tropism of viral pathogens. Research over the past 60 years has revealed an incredible diversity of abortive infections by DNA and RNA viruses in various animal cell types. Here we discuss the general causes of abortive infections and provide specific examples from the literature to illustrate the range of abortive infections that have been reported. We also discuss how abortive infections can have critical roles in shaping host immune responses and in the development of virus-induced cancers. Finally, we describe how abortive infections can be applied to basic and clinical research, underscoring the importance of understanding these fascinating aspects of virus biology.
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Affiliation(s)
- Aaron Embry
- Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA;
| | - Don B Gammon
- Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA;
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2
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Qiao Y, Zhu S, Yang N, Zou SS, Gao B, Wu J, Liu C, Li X, Liu YJ, Chen J. The RNA helicase DHX35 functions as a co-sensor for RIG-I-mediated innate immunity. PLoS Pathog 2024; 20:e1012379. [PMID: 39037956 PMCID: PMC11262647 DOI: 10.1371/journal.ppat.1012379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 06/27/2024] [Indexed: 07/24/2024] Open
Abstract
RNA helicases are involved in the innate immune response against pathogens, including bacteria and viruses; however, their mechanism in the human airway epithelial cells is still not fully understood. Here, we demonstrated that DEAH (Asp-Glu-Ala-His) box polypeptide 35 (DHX35), a member of the DExD/H (Asp-Glu-x-Asp/His)-box helicase family, boosts antiviral innate immunity in human airway epithelial cells. DHX35 knockdown attenuated the production of interferon-β (IFN-β), IL6, and CXCL10, whereas DHX35 overexpression increased their production. Upon stimulation, DHX35 was constitutively expressed, but it translocated from the nucleus into the cytosol, where it recognized cytosolic poly(I:C) and poly(dA:dT) via its HELICc domain. Mitochondrial antiviral signaling protein (MAVS) acted as an adaptor for DHX35 and interacted with the HELICc domain of DHX35 using amino acids 360-510. Interestingly, DHX35 interacted with retinoic acid-inducible gene 1 (RIG-I), enhanced the binding affinity of RIG-I with poly(I:C) and poly(dA:dT), and formed a signalsome with MAVS to activate interferon regulatory factor 3 (IRF3), NF-κB-p65, and MAPK signaling pathways. These results indicate that DHX35 not only acted as a cytosolic nucleic acid sensor but also synergized with RIG-I to enhance antiviral immunity in human airway epithelial cells. Our results demonstrate a novel molecular mechanism for DHX35 in RIG-I-mediated innate immunity and provide a novel candidate for drug and vaccine design to control viral infections in the human airway.
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Affiliation(s)
- Yuan Qiao
- Cancer Center, The First Hospital of Jilin University, Changchun, China
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Shan Zhu
- Cancer Center, The First Hospital of Jilin University, Changchun, China
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Ning Yang
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Shan-Shan Zou
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Bao Gao
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Jing Wu
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Chunyan Liu
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Xiaoping Li
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Yong-Jun Liu
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
| | - Jingtao Chen
- Cancer Center, The First Hospital of Jilin University, Changchun, China
- Laboratory for Tumor Immunology, The First Hospital of Jilin University, Changchun, China
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3
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Messmer M, Pierson L, Pasquier C, Djordjevic N, Chicher J, Hammann P, Pfeffer S, Girardi E. DEAD box RNA helicase 5 is a new pro-viral host factor for Sindbis virus infection. Virol J 2024; 21:76. [PMID: 38553727 PMCID: PMC10981342 DOI: 10.1186/s12985-024-02349-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 03/20/2024] [Indexed: 04/01/2024] Open
Abstract
BACKGROUND RNA helicases are emerging as key factors regulating host-virus interactions. The DEAD-box ATP-dependent RNA helicase DDX5, which plays an important role in many aspects of cellular RNA biology, was also found to either promote or inhibit viral replication upon infection with several RNA viruses. Here, our aim is to examine the impact of DDX5 on Sindbis virus (SINV) infection. METHODS We analysed the interaction between DDX5 and the viral RNA using imaging and RNA-immunoprecipitation approaches. The interactome of DDX5 in mock- and SINV-infected cells was determined by mass spectrometry. We validated the interaction between DDX17 and the viral capsid by co- immunoprecipitation in the presence or absence of an RNase treatment. We determined the subcellular localization of DDX5, its cofactor DDX17 and the viral capsid protein by co-immunofluorescence. Finally, we investigated the impact of DDX5 depletion and overexpression on SINV infection at the viral protein, RNA and infectious particle accumulation level. The contribution of DDX17 was also tested by knockdown experiments. RESULTS In this study we demonstrate that DDX5 interacts with the SINV RNA during infection. Furthermore, the proteomic analysis of the DDX5 interactome in mock and SINV-infected HCT116 cells identified new cellular and viral partners and confirmed the interaction between DDX5 and DDX17. Both DDX5 and DDX17 re-localize from the nucleus to the cytoplasm upon SINV infection and interact with the viral capsid protein. We also show that DDX5 depletion negatively impacts the viral replication cycle, while its overexpression has a pro-viral effect. Finally, we observed that DDX17 depletion reduces SINV infection, an effect which is even more pronounced in a DDX5-depleted background, suggesting a synergistic pro-viral effect of the DDX5 and DDX17 proteins on SINV. CONCLUSIONS These results not only shed light on DDX5 as a novel and important host factor to the SINV life cycle, but also expand our understanding of the roles played by DDX5 and DDX17 as regulators of viral infections.
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Affiliation(s)
- Mélanie Messmer
- Architecture et Réactivité de l'ARN, Institut de Biologie Moléculaire et Cellulaire du CNRS, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France
| | - Louison Pierson
- Architecture et Réactivité de l'ARN, Institut de Biologie Moléculaire et Cellulaire du CNRS, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France
| | - Charline Pasquier
- Architecture et Réactivité de l'ARN, Institut de Biologie Moléculaire et Cellulaire du CNRS, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France
| | - Nikola Djordjevic
- Architecture et Réactivité de l'ARN, Institut de Biologie Moléculaire et Cellulaire du CNRS, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France
| | - Johana Chicher
- Institut de Biologie Moléculaire et Cellulaire du CNRS, Plateforme Protéomique Strasbourg - Esplanade, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France
| | - Philippe Hammann
- Institut de Biologie Moléculaire et Cellulaire du CNRS, Plateforme Protéomique Strasbourg - Esplanade, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France
| | - Sébastien Pfeffer
- Architecture et Réactivité de l'ARN, Institut de Biologie Moléculaire et Cellulaire du CNRS, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France
| | - Erika Girardi
- Architecture et Réactivité de l'ARN, Institut de Biologie Moléculaire et Cellulaire du CNRS, Université de Strasbourg, 2 allée Konrad Roentgen, Strasbourg, 67084, France.
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4
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Tapescu I, Taschuk F, Pokharel SM, Zginnyk O, Ferretti M, Bailer PF, Whig K, Madden EA, Heise MT, Schultz DC, Cherry S. The RNA helicase DDX39A binds a conserved structure in chikungunya virus RNA to control infection. Mol Cell 2023; 83:4174-4189.e7. [PMID: 37949067 PMCID: PMC10722560 DOI: 10.1016/j.molcel.2023.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 04/25/2023] [Accepted: 10/12/2023] [Indexed: 11/12/2023]
Abstract
Alphaviruses are a large group of re-emerging arthropod-borne RNA viruses. The compact viral RNA genomes harbor diverse structures that facilitate replication. These structures can be recognized by antiviral cellular RNA-binding proteins, including DExD-box (DDX) helicases, that bind viral RNAs to control infection. The full spectrum of antiviral DDXs and the structures that are recognized remain unclear. Genetic screening identified DDX39A as antiviral against the alphavirus chikungunya virus (CHIKV) and other medically relevant alphaviruses. Upon infection, the predominantly nuclear DDX39A accumulates in the cytoplasm inhibiting alphavirus replication, independent of the canonical interferon pathway. Biochemically, DDX39A binds to CHIKV genomic RNA, interacting with the 5' conserved sequence element (5'CSE), which is essential for the antiviral activity of DDX39A. Altogether, DDX39A relocalization and binding to a conserved structural element in the alphavirus genomic RNA attenuates infection, revealing a previously unknown layer to the cellular control of infection.
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Affiliation(s)
- Iulia Tapescu
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA; Biochemistry and Biophysics Graduate Group, University of Pennsylvania, Philadelphia, PA, USA
| | - Frances Taschuk
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA; Cell and Molecular Biology Graduate Group, University of Pennsylvania, Philadelphia, PA, USA
| | - Swechha M Pokharel
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Oleksandr Zginnyk
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Max Ferretti
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA, USA
| | - Peter F Bailer
- Biochemistry and Biophysics Graduate Group, University of Pennsylvania, Philadelphia, PA, USA
| | - Kanupryia Whig
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA, USA
| | - Emily A Madden
- Department of Microbiology and Immunology, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Mark T Heise
- Department of Microbiology and Immunology, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - David C Schultz
- Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA, USA
| | - Sara Cherry
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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5
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Xu M, Yang M. DDX52 gene expression in LUAD tissues indicates potential as a prognostic biomarker and therapeutic target. Sci Rep 2023; 13:17434. [PMID: 37833424 PMCID: PMC10575940 DOI: 10.1038/s41598-023-44347-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 10/06/2023] [Indexed: 10/15/2023] Open
Abstract
Lung adenocarcinoma (LUAD) remains a leading cause of cancer-related morbidity and mortality globally. While DDX52, an ATP-dependent RNA helicase, plays a role in several biological processes, its specific involvement in LUAD is yet to be elucidated. We utilized ROC curves to determine DDX52's predictive potential for LUAD. Kaplan-Meier survival curves, along with univariate and multivariate Cox analyses, assessed the prognostic implications of DDX52 in LUAD. We constructed nomogram models to further delineate DDX52's influence on prognosis, employed GSEA for functional analysis, and used qRT-PCR to examine DDX52 expression in LUAD tissues. DDX52 expression was notably higher in LUAD tissues, suggesting its potential as a negative prognostic marker. We observed a direct relationship between DDX52 expression and advanced T and N stages, as well as higher grading and staging in LUAD patients. Cox analyses further underscored DDX52's role as an independent prognostic determinant for LUAD. GSEA insights indicated DDX52's influence on LUAD progression via multiple signaling pathways. Our nomogram, founded on DDX52 expression, effectively projected LUAD patient survival, as validated by calibration curves. Elevated DDX52 expression in LUAD tissues signals its potential as a poor prognostic marker. Our findings emphasize DDX52's role not only as an independent prognostic factor for LUAD but also as a significant influencer in its progression through diverse signaling pathways. The constructed nomogram also underscores the feasibility of predicting LUAD patient survival based on DDX52 expression.
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Affiliation(s)
- Mingming Xu
- Department of Thoracic Surgery, Affiliated Hospital of Nantong University, 20 Xisi Street, Nantong, 226001, China
| | - Mingjun Yang
- Department of Thoracic Surgery, Affiliated Hospital of Nantong University, 20 Xisi Street, Nantong, 226001, China.
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6
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Rahman MM, van Oosterom F, Enow JA, Hossain M, Gutierrez-Jensen AD, Cashen M, Everts A, Lowe K, Kilbourne J, Daggett-Vondras J, Karr TL, McFadden G. Nuclear Export Inhibitor Selinexor Enhances Oncolytic Myxoma Virus Therapy against Cancer. CANCER RESEARCH COMMUNICATIONS 2023; 3:952-968. [PMID: 37377603 PMCID: PMC10234290 DOI: 10.1158/2767-9764.crc-22-0483] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 03/08/2023] [Accepted: 05/11/2023] [Indexed: 06/29/2023]
Abstract
Oncolytic viruses exploited for cancer therapy have been developed to selectively infect, replicate, and kill cancer cells to inhibit tumor growth. However, in some cancer cells, oncolytic viruses are often limited in completing their full replication cycle, forming progeny virions, and/or spreading in the tumor bed because of the heterogeneous cell types within the tumor bed. Here, we report that the nuclear export pathway regulates oncolytic myxoma virus (MYXV) infection and cytoplasmic viral replication in a subclass of human cancer cell types where viral replication is restricted. Inhibition of the XPO-1 (exportin 1) nuclear export pathway with nuclear export inhibitors can overcome this restriction by trapping restriction factors in the nucleus and allow significantly enhanced viral replication and killing of cancer cells. Furthermore, knockdown of XPO-1 significantly enhanced MYXV replication in restrictive human cancer cells and reduced the formation of antiviral granules associated with RNA helicase DHX9. Both in vitro and in vivo, we demonstrated that the approved XPO1 inhibitor drug selinexor enhances the replication of MYXV and kills diverse human cancer cells. In a xenograft tumor model in NSG mice, combination therapy with selinexor plus MYXV significantly reduced the tumor burden and enhanced the survival of animals. In addition, we performed global-scale proteomic analysis of nuclear and cytosolic proteins in human cancer cells to identify the host and viral proteins that were upregulated or downregulated by different treatments. These results indicate, for the first time, that selinexor in combination with oncolytic MYXV can be used as a potential new therapy. Significance We demonstrated that a combination of nuclear export inhibitor selinexor and oncolytic MYXV significantly enhanced viral replication, reduced cancer cell proliferation, reduced tumor burden, and enhanced the overall survival of animals. Thus, selinexor and oncolytic MYXV can be used as potential new anticancer therapy.
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Affiliation(s)
- Masmudur M. Rahman
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Fleur van Oosterom
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Junior A. Enow
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
- School of Life Sciences, Arizona State University, Tempe, Arizona
| | - Maksuda Hossain
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Ami D. Gutierrez-Jensen
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Mackenzie Cashen
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Anne Everts
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Kenneth Lowe
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Jacquelyn Kilbourne
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Juliane Daggett-Vondras
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Timothy L. Karr
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
| | - Grant McFadden
- Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute, Arizona State University, Tempe, Arizona
- School of Life Sciences, Arizona State University, Tempe, Arizona
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7
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Nuclear export inhibitor Selinexor targeting XPO1 enhances coronavirus replication. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.02.09.527884. [PMID: 36824761 PMCID: PMC9948980 DOI: 10.1101/2023.02.09.527884] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Nucleocytoplasmic transport of proteins using XPO1 (exportin 1) plays a vital role in cell proliferation and survival. Many viruses also exploit this pathway to promote infection and replication. Thus, inhibiting XPO1-mediated nuclear export with selective inhibitors activates multiple antiviral and anti-inflammatory pathways. The XPO1 inhibitor, Selinexor, is an FDA-approved anticancer drug predicted to have antiviral function against many viruses, including SARS-CoV-2. Unexpectedly, we observed that pretreatment of cultured human cells with Selinexor actually enhanced protein expression and replication of coronaviruses, including SARS-CoV-2. Knockdown of cellular XPO1 protein expression significantly enhanced the replication of coronaviruses in human cells. We further demonstrate that Selinexor treatment reduced the formation of unique cytoplasmic antiviral granules that include RNA helicase DHX9 in the virus-infected cells. These results, for the first time, show that the anti-cancer drug Selinexor enhances the replication of coronaviruses in human cells in vitro and thus should be further explored in vivo for the potential impact on the dual use for anticancer and antiviral therapy.
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8
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Saghazadeh A, Rezaei N. Poxviruses and the immune system: Implications for monkeypox virus. Int Immunopharmacol 2022; 113:109364. [PMID: 36283221 PMCID: PMC9598838 DOI: 10.1016/j.intimp.2022.109364] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/09/2022] [Accepted: 10/14/2022] [Indexed: 11/05/2022]
Abstract
Poxviruses (PXVs) are mostly known for the variola virus, being the cause of smallpox; however, re-emerging PXVs have also shown a great capacity to develop outbreaks of pox-like infections in humans. The situation is alarming; PXV outbreaks have been involving both endemic and non-endemic areas in recent decades. Stopped smallpox vaccination is a reason offered mainly for this changing epidemiology that implies the protective role of immunity in the pathology of PXV infections. The immune system recognizes PXVs and elicits responses, but PXVs can antagonize these responses. Here, we briefly review the immunology of PXV infections, with emphasis on the role of pattern-recognition receptors, macrophages, and natural killer cells in the early response to PXV infections and PXVs’ strategies influencing these responses, as well as taking a glance at other immune cells, which discussion over them mainly occurs in association with PXV immunization rather than PXV infection. Throughout the review, numerous evasion mechanisms are highlighted, which might have implications for designing specific immunotherapies for PXV in the future.
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Affiliation(s)
- Amene Saghazadeh
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran; Systematic Review and Meta-analysis Expert Group (SRMEG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Nima Rezaei
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran.
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9
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Cleavage of AUF1 by Coxsackievirus B Affects DDX5 Regulatory on Viral Replication through iTRAQ Proteomics Analysis. BIOMED RESEARCH INTERNATIONAL 2022; 2022:8610467. [PMID: 36246972 PMCID: PMC9560859 DOI: 10.1155/2022/8610467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 09/09/2022] [Indexed: 11/18/2022]
Abstract
Coxsackievirus B (CVB) 3C protease (3Cpro) plays a specific cleavage role on AU-rich binding factor (AUF1, also called hnRNP D), which consequently disputes the regulation of AUF1 on downstream molecules. In our study, the iTRAQ approach was first used to quantify the differentially expressed cellular proteins in AUF1-overexpressing HeLa cells, which provides straightforward insight into the role of AUF1 during viral infection. A total of 1,290 differentially expressed proteins (DEPs), including 882 upregulated and 408 downregulated proteins, were identified. The DEPs are involved in a variety of cellular processes via GO terms, protein–protein interactions, and a series of further bioinformatics analyses. Among the DEPs, some demonstrated important roles in cellular metabolism. In particular, DDX5 was further verified to be negatively regulated by AUF1 and increased in CVB-infected cells, which in turn promoted CVB replication. These findings provide potential novel ideas for exploring new antiviral therapy targets.
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10
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Serfecz JC, Hong Y, Gay LA, Shekhar R, Turner PC, Renne R. DExD/H Box Helicases DDX24 and DDX49 Inhibit Reactivation of Kaposi's Sarcoma Associated Herpesvirus by Interacting with Viral mRNAs. Viruses 2022; 14:2083. [PMID: 36298642 PMCID: PMC9609691 DOI: 10.3390/v14102083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/14/2022] [Accepted: 09/16/2022] [Indexed: 11/16/2022] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is an oncogenic gammaherpesvirus that is the causative agent of primary effusion lymphoma and Kaposi's sarcoma. In healthy carriers, KSHV remains latent, but a compromised immune system can lead to lytic viral replication that increases the probability of tumorigenesis. RIG-I-like receptors (RLRs) are members of the DExD/H box helicase family of RNA binding proteins that recognize KSHV to stimulate the immune system and prevent reactivation from latency. To determine if other DExD/H box helicases can affect KSHV lytic reactivation, we performed a knock-down screen that revealed DHX29-dependent activities appear to support viral replication but, in contrast, DDX24 and DDX49 have antiviral activity. When DDX24 or DDX49 are overexpressed in BCBL-1 cells, transcription of all lytic viral genes and genome replication were significantly reduced. RNA immunoprecipitation of tagged DDX24 and DDX49 followed by next-generation sequencing revealed that the helicases bind to mostly immediate-early and early KSHV mRNAs. Transfection of expression plasmids of candidate KSHV transcripts, identified from RNA pull-down, demonstrated that KSHV mRNAs stimulate type I interferon (alpha/beta) production and affect the expression of multiple interferon-stimulated genes. Our findings reveal that host DExD/H box helicases DDX24 and DDX49 recognize gammaherpesvirus transcripts and convey an antiviral effect in the context of lytic reactivation.
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Affiliation(s)
- Jacquelyn C. Serfecz
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Yuan Hong
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL 32610, USA
- Genetics Institute, University of Florida, Gainesville, FL 32610, USA
| | - Lauren A. Gay
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Ritu Shekhar
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Peter C. Turner
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Rolf Renne
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL 32610, USA
- Genetics Institute, University of Florida, Gainesville, FL 32610, USA
- UF Health Cancer Center, University of Florida, Gainesville, FL 32610, USA
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11
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Zhao L, Zhao Y, Liu Q, Huang J, Lu Y, Ping J. DDX5/METTL3-METTL14/YTHDF2 Axis Regulates Replication of Influenza A Virus. Microbiol Spectr 2022; 10:e0109822. [PMID: 35583334 PMCID: PMC9241928 DOI: 10.1128/spectrum.01098-22] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 04/28/2022] [Indexed: 12/14/2022] Open
Abstract
DEAD-box helicase 5 (DDX5), a member of the DEAD/H-box helicases, is known to participate in all aspects of RNA metabolism. However, its regulatory effect in antiviral innate immunity during replication of influenza virus remains unclear. Herein, we found that human DDX5 promotes replication of influenza virus in A549 cells. Moreover, our results further revealed that DDX5 relies on its N terminus to interact with the nucleoprotein (NP) of influenza virus, which is independent of RNA. Of course, we also observed colocalization of DDX5 with NP in the context of transfection or infection. However, influenza virus infection had no significant effect on the protein expression and nucleocytoplasmic distribution of DDX5. Importantly, we found that DDX5 suppresses antiviral innate immunity induced by influenza virus infection. Mechanistically, DDX5 downregulated the mRNA levels of interferon beta (IFN-β), interleukin 6 (IL-6), and DHX58 via the METTL3-METTL14/YTHDF2 axis. We revealed that DDX5 bound antiviral transcripts and regulated immune responses through YTHDF2-dependent mRNA decay. Taken together, our data demonstrate that the DDX5/METTL3-METTL14/YTHDF2 axis regulates the replication of influenza A virus. IMPORTANCE The replication and transcription of influenza virus depends on the participation of many host factors in cells. Exploring the relationship between viruses and host factors will help us fully understand the characteristics and pathogenic mechanisms of influenza viruses. In this study, we showed that DDX5 interacted with the NP of influenza virus. We demonstrated that DDX5 downregulated the expression of IFN-β and IL-6 and the transcription of antiviral genes downstream from IFN-β in influenza virus-infected A549 cells. Additionally, DDX5 downregulated the mRNA levels of antiviral transcripts via the METTL3-METTL14/YTHDF2 axis. Our findings provide a novel perspective to understand the mechanism by which DDX5 regulates antiviral immunity.
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Affiliation(s)
- Lingcai Zhao
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Engineering Laboratory of Animal Immunity of Jiangsu Province, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Yongzhen Zhao
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Engineering Laboratory of Animal Immunity of Jiangsu Province, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Qingzheng Liu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Engineering Laboratory of Animal Immunity of Jiangsu Province, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Jingjin Huang
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Engineering Laboratory of Animal Immunity of Jiangsu Province, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Yuanlu Lu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Engineering Laboratory of Animal Immunity of Jiangsu Province, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Jihui Ping
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Engineering Laboratory of Animal Immunity of Jiangsu Province, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
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Hu M, Zheng H, Wu J, Sun Y, Wang T, Chen S. DDX5: an expectable treater for viral infection- a literature review. ANNALS OF TRANSLATIONAL MEDICINE 2022; 10:712. [PMID: 35845539 PMCID: PMC9279824 DOI: 10.21037/atm-22-2375] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 06/21/2022] [Indexed: 11/06/2022]
Abstract
Background and Objective DEAD-box protein (DDX)5 plays important roles in multiple aspects of cellular processes that require modulating RNA structure. Alongside the canonical role of DDX5 in RNA metabolism, many reports have shown that DDX5 influences viral infection by directly interacting with viral proteins. However, the functional role of DDX5 in virus-associated cancers, as well as the identity of DDX5 in virus infection-associated signaling pathways, has remained largely unexplained. Here, we further explore the precise functions of DDX5 and its potential targets for antiviral treatment. Methods We searched the PubMed and PMC databases to identify studies on role of DDXs, especially DDX5, during various viral infection published up to May 2022. Key Content and Findings DDX5 functions as both a viral infection helper and inhibitor, which depends on virus type. DDXs proteins have been identified to play roles on multiple aspects covering RNA metabolism and function. Conclusions DDX5 influences viral pathogenesis by participating in viral replication and multiple viral infection-related signaling pathways, it also plays a double-edge sword role under different viral infection conditions. Deep investigation into the mechanism of DDX5 modulating immune response in host cells revealed that it holds highly potential usage for future antiviral therapy. We reviewed current studies to provide a comprehensive update of the role of DDX5 in viral infection.
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Affiliation(s)
- Minghui Hu
- Clinical Lab, The Affiliated Hospital of Qingdao University, Qingdao China
| | - Hongying Zheng
- Clinical Lab, The Affiliated Hospital of Qingdao University, Qingdao China
| | - Jingqi Wu
- Microbiology Department, Harbin Medical University, Harbin, China
| | - Yue Sun
- School of Public Health, Harbin Medical University, Harbin, China
| | - Tianying Wang
- Clinical Research Center, Qingdao Municipal Hospital, Qingdao, China
| | - Shuang Chen
- Clinical Lab, Qingdao Municipal Hospital, Qingdao, China
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13
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bin Umair M, Akusa FN, Kashif H, Seerat-e-Fatima, Butt F, Azhar M, Munir I, Ahmed M, Khalil W, Sharyar H, Rafique S, Shahid M, Afzal S. Viruses as tools in gene therapy, vaccine development, and cancer treatment. Arch Virol 2022; 167:1387-1404. [PMID: 35462594 PMCID: PMC9035288 DOI: 10.1007/s00705-022-05432-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 01/28/2022] [Indexed: 12/11/2022]
Abstract
Using viruses to our advantage has been a huge leap for humanity. Their ability to mediate horizontal gene transfer has made them useful tools for gene therapy, vaccine development, and cancer treatment. Adenoviruses, adeno-associated viruses, retroviruses, lentiviruses, alphaviruses, and herpesviruses are a few of the most common candidates for use as therapeutic agents or efficient gene delivery systems. Efforts are being made to improve and perfect viral-vector-based therapies to overcome potential or reported drawbacks. Some preclinical trials of viral vector vaccines have yielded positive results, indicating their potential as prophylactic or therapeutic vaccine candidates. Utilization of the oncolytic activity of viruses is the future of cancer therapy, as patients will then be free from the harmful effects of chemo- or radiotherapy. This review discusses in vitro and in vivo studies showing the brilliant therapeutic potential of viruses.
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Affiliation(s)
- Musab bin Umair
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Fujimura Nao Akusa
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Hadia Kashif
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Seerat-e-Fatima
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Fatima Butt
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Marium Azhar
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Iqra Munir
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Muhammad Ahmed
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Wajeeha Khalil
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Hafiz Sharyar
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Shazia Rafique
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Muhammad Shahid
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Samia Afzal
- Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, 87-West Canal Bank Road, Thokar Niaz Baig, Lahore, Pakistan
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Liu Z, Ye Y, Liu Y, Liu Y, Chen H, Shen M, Wang Z, Huang S, Han L, Chen Z, He X. RNA Helicase DHX37 Facilitates Liver Cancer Progression by Cooperating with PLRG1 to Drive Superenhancer-Mediated Transcription of Cyclin D1. Cancer Res 2022; 82:1937-1952. [PMID: 35290436 PMCID: PMC9359749 DOI: 10.1158/0008-5472.can-21-3038] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 01/11/2022] [Accepted: 03/09/2022] [Indexed: 01/07/2023]
Abstract
RNA helicases are dysregulated in tumors. Here, we identified DHX37 as one of the top RNA helicase genes with upregulated expression in hepatocellular carcinoma (HCC). DHX37 promoted proliferation of liver cancer cells in vitro and in vivo. Epigenomic profiling of DHX37-knockdown and control HCC cells revealed that DHX37 is associated with superenhancer activity. Mechanistically, DHX37 interacted with pleiotropic regulator 1 (PLRG1) to transcriptionally activate cyclin D1 (CCND1) expression via co-occupation of its promoter and superenhancer elements. DHX37 and PLRG1 promoted liver cancer cell proliferation and contributed to the poor prognosis of patients with HCC. Importantly, CCND1 inhibitors were effective as antiproliferative agents for liver cancer. These results together demonstrate a cooperative mechanistic interaction between DHX37 and PLRG1 that regulates CCND1 expression and promotes liver cancer progression, advancing our understanding of the epigenetic and transcriptional dysregulations mediated by RNA helicases and superenhancers in HCC. SIGNIFICANCE This work characterizes a novel mechanism of superenhancer-driven cyclin D1 upregulation by DHX37 and PLRG1, implicating this pathway as a potential therapeutic target in hepatocellular carcinoma.
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Affiliation(s)
- Zhen Liu
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China
| | - Youqiong Ye
- Shanghai Institute of Immunology, Department of Immunology and Microbiology, Shanghai Jiao Tong University School of Medicine, Shanghai, P.R. China
| | - Yizhe Liu
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China
| | - Yanfang Liu
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China
| | - Huifang Chen
- Shanghai Institute of Immunology, Department of Immunology and Microbiology, Shanghai Jiao Tong University School of Medicine, Shanghai, P.R. China
| | - Mengting Shen
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China
| | - Zhen Wang
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China
| | - Shenglin Huang
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China.,Key Laboratory of Breast Cancer in Shanghai, Fudan University Shanghai Cancer Center, Fudan University, Shanghai, P.R. China
| | - Leng Han
- Center for Epigenetics and Disease Prevention, Institute of Biosciences and Technology, Texas A&M University, Houston, Texas
| | - Zhiao Chen
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China.,Corresponding Authors: Xianghuo He, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Department of Oncology, Shanghai Medical College, Fudan University, Bldg. 7, Room 302, 270 Dong An Rd., Shanghai 200032, P.R. China. Phone: 8621-3477-7329; Fax: 8621-6417-2585; E-mail: ; and Zhiao Chen,
| | - Xianghuo He
- Department of Oncology, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, P.R. China.,Key Laboratory of Breast Cancer in Shanghai, Fudan University Shanghai Cancer Center, Fudan University, Shanghai, P.R. China.,Corresponding Authors: Xianghuo He, Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Department of Oncology, Shanghai Medical College, Fudan University, Bldg. 7, Room 302, 270 Dong An Rd., Shanghai 200032, P.R. China. Phone: 8621-3477-7329; Fax: 8621-6417-2585; E-mail: ; and Zhiao Chen,
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15
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Águeda-Pinto A, Kraberger S, Everts A, Gutierrez-Jensen A, Glenn HL, Dalton KP, Podadera A, Parra F, Martinez-Haro M, Viñuelas JA, Varsani A, McFadden G, Rahman MM, Esteves PJ. Identification of a Novel Myxoma Virus C7-Like Host Range Factor That Enabled a Species Leap from Rabbits to Hares. mBio 2022; 13:e0346121. [PMID: 35352978 PMCID: PMC9040879 DOI: 10.1128/mbio.03461-21] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 02/23/2022] [Indexed: 01/04/2023] Open
Abstract
Myxoma virus (MYXV) is naturally found in rabbit Sylvilagus species and is known to cause lethal myxomatosis in European rabbits (Oryctolagus cuniculus). In 2019, an MYXV strain (MYXV strain Toledo [MYXV-Tol]) causing myxomatosis-like disease in Iberian hares (Lepus granatensis) was identified. MYXV-Tol acquired a recombinant region of ∼2.8 kb harboring several new genes, including a novel host range gene (M159) that we show to be an orthologous member of the vaccinia virus C7 host range family. Here, to test whether M159 alone has enabled MYXV to alter its host range to Iberian hares, several recombinant viruses were generated, including an MYXV-Tol ΔM159 (knockout) strain. While MYXV-Tol underwent fully productive infection in hare HN-R cells, neither the wild-type MYXV-Lau strain (lacking M159) nor vMyxTol-ΔM159 (deleted for M159) was able to infect and replicate, showing that the ability of MYXV-Tol to infect these cells and replicate depends on the presence of M159. Similar to other C7L family members, M159 was shown to be expressed as an early/late gene but was translocated into the nucleus at later time points, indicating that further studies are needed to elucidate its role in the nucleus. Finally, in rabbit cells, the M159 protein did not contribute to increased replication but was able to upregulate the replication levels of MYXV in nonpermissive and semipermissive human cancer cells, suggesting that the M159-targeted pathway is conserved across mammalian species. Altogether, these observations demonstrate that the M159 protein plays a critical role in determining the host specificity of MYXV-Tol in hare and human cells by imparting new host range functions. IMPORTANCE The coevolution of European rabbit populations and MYXV is a textbook example of an arms race between a pathogen and a host. Recently, a recombinant MYXV (MYXV-Tol) crossed the species barrier by jumping from leporid species to another species, causing lethal myxomatosis-like disease. Given the highly pathogenic nature of this new virus in hares and the incidences of other poxvirus cross-species spillovers into other animals, including humans, it is important to understand how and why MYXV-Tol was able to become virulent in a new host species. The results presented clearly demonstrate that M159 is the key factor allowing MYXV-Tol replication in hare cells by imparting new host range functions. These results have the potential to improve current knowledge about the virulence of poxviruses and provide a platform to better understand the new MYXV-Tol, rendering the virus capable of leaping into a new host species.
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Affiliation(s)
- Ana Águeda-Pinto
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
- Center for Immunotherapy, Vaccines and Virotherapy (CIVV), The Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Simona Kraberger
- The Biodesign Center for Fundamental and Applied Microbiomics, Center for Evolution and Medicine, School of Life Sciences, Arizona State University, Tempe, AZ , USA
| | - Anne Everts
- Center for Immunotherapy, Vaccines and Virotherapy (CIVV), The Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Ami Gutierrez-Jensen
- Center for Immunotherapy, Vaccines and Virotherapy (CIVV), The Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Honor L. Glenn
- Center for Immunotherapy, Vaccines and Virotherapy (CIVV), The Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Kevin P. Dalton
- Instituto Universitario de Biotecnología de Asturias, Departamento de Bioquímica y Biología Molecular, Edificio Santiago Gascón, Universidad de Oviedo, Campus El Cristo, Oviedo, Spain
| | - Ana Podadera
- Instituto Universitario de Biotecnología de Asturias, Departamento de Bioquímica y Biología Molecular, Edificio Santiago Gascón, Universidad de Oviedo, Campus El Cristo, Oviedo, Spain
| | - Francisco Parra
- Instituto Universitario de Biotecnología de Asturias, Departamento de Bioquímica y Biología Molecular, Edificio Santiago Gascón, Universidad de Oviedo, Campus El Cristo, Oviedo, Spain
| | - Monica Martinez-Haro
- Instituto Regional de Investigación y Desarrollo Agroalimentario y Forestal (IRIAF), CIAG del Chaparrillo, Ciudad Real, Spain
| | - José Alberto Viñuelas
- Instituto Regional de Investigación y Desarrollo Agroalimentario y Forestal (IRIAF), CIAG del Chaparrillo, Ciudad Real, Spain
| | - Arvind Varsani
- The Biodesign Center for Fundamental and Applied Microbiomics, Center for Evolution and Medicine, School of Life Sciences, Arizona State University, Tempe, AZ , USA
- Structural Biology Research Unit, Department of Integrative Biomedical Sciences, University of Cape Town, Observatory, Cape Town, South Africa
| | - Grant McFadden
- Center for Immunotherapy, Vaccines and Virotherapy (CIVV), The Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Masmudur M. Rahman
- Center for Immunotherapy, Vaccines and Virotherapy (CIVV), The Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Pedro J. Esteves
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
- CITS—Centro de Investigação em Tecnologias da Saúde, IPSN, CESPU, Gandra, Portugal
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16
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Zhou J, Huang S, Fan B, Niu B, Guo R, Gu J, Gao S, Li B. iTRAQ-based proteome analysis of porcine group A rotavirus-infected porcine IPEC-J2 intestinal epithelial cells. J Proteomics 2021; 248:104354. [PMID: 34418579 DOI: 10.1016/j.jprot.2021.104354] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 07/20/2021] [Accepted: 08/10/2021] [Indexed: 11/25/2022]
Abstract
Porcine rotavirus (PoRV), particularly group A, is one of the most important swine pathogens, causing substantial economic losses in the animal husbandry industry. To improve understanding of host responses to PoRV infection, we applied isobaric tags for relative and absolute quantification (iTRAQ) labeling coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) to quantitatively identify the differentially expressed proteins in PoRV-infected IPEC-J2 cells and confirmed the differentially accumulated proteins (DAPs) expression differences by performing RT-qPCR and Western blot analysis. Herein, in PoRV- and mock-infected IPEC-J2 cells, relative quantitative data were identified for 4724 proteins, 223 of which were DAPs (125 up-accumulated and 98 down-accumulated). Bioinformatics analyses further revealed that a majority of the DAPs are involved in numerous crucial biological processes and signaling pathways, such as metabolic process, immune system process, amino acid metabolism, energy metabolism, immune system, MHC class I peptide loading complex, Hippo signaling pathway, Th1 and Th2 cell differentiation, antigen processing and presentation, and tubule bicarbonate reclamation. The cellular localization prediction analysis indicated that these DAPs may be located in the Golgi apparatus, nucleus, peroxisomal, cytoplasm, mitochondria, extracellular, plasma membrane, and endoplasmic reticulum (ER). Expression levels of three up-accumulated (VAMP4, IKBKE, and TJP3) or two down-accumulated (SOD3 and DHX9) DAPs upon PoRV infection, were further validated by RT-qPCR and Western blot analysis. Collectively, this work is the first time to investigate the protein profile of PoRV-infected IPEC-J2 cells using quantitative proteomics; these findings provide valuable information to better understand the mechanisms underlying the host responses to PoRV infection in piglets. SIGNIFICANCE: The proteomics analysis of this study uncovered the target associated with PoRV-induced innate immune response or cellular damage, and provided relevant insights into the molecular functions, biological processes, and signaling pathway in these targets. Out of these 223 DAPs, the expression levels of three up-accumulated (VAMP4, IKBKE, and TJP3) and two down-accumulated (SOD3 and DHX9) DAPs upon PoRV infection, have been further validated using RT-qPCR and Western blot analysis. These outcomes could uncover how PoRV manipulated the cellular machinery, which could further our understanding of PoRV pathogenesis in piglets.
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Affiliation(s)
- Jinzhu Zhou
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, Jiangsu, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, PR China
| | - Shimeng Huang
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, Jiangsu, China
| | - Baochao Fan
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, Jiangsu, China; School of Life Sciences, Jiangsu University, Zhenjiang 212013, China
| | - Beibei Niu
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, Jiangsu, China; College of Veterinary Medicine, Nanjing Agricultural University, No.1 Wei-gang, Nanjing 210095, China
| | - Rongli Guo
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, Jiangsu, China
| | - Jun Gu
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, Jiangsu, China; School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Song Gao
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, PR China
| | - Bin Li
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing 210014, Jiangsu, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou 225009, PR China; School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; School of Life Sciences, Jiangsu University, Zhenjiang 212013, China.
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17
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Yu W, Ma H, Li J, Ge J, Wang P, Zhou Y, Zhang J, Shi G. DDX52 knockdown inhibits the growth of prostate cancer cells by regulating c-Myc signaling. Cancer Cell Int 2021; 21:430. [PMID: 34399732 PMCID: PMC8365980 DOI: 10.1186/s12935-021-02128-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 07/30/2021] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND DDX52 is a type of DEAD/H box RNA helicase that was identified as a novel prostate cancer (PCa) genetic locus and possible causal gene in a European large-scale transcriptome-wide association study. However, the functions of DDX52 in PCa remain undetermined. The c-Myc oncogene plays a crucial role in the development of PCa, but the factors that regulate the activity of c-Myc in PCa are still unknown. METHODS We determined DDX52 protein levels in PCa tissues using immunohistochemistry (IHC). DDX52 expression and survival outcomes in other PCa cohorts were examined using bioinformatics analysis. The inhibition of DDX52 via RNA interference with shRNA was used to clarify the effects of DDX52 on PCa cell growth in vitro and in vivo. Gene set enrichment analysis and RNA sequencing were used to explore the signaling regulated by DDX52 in PCa. Western blotting and IHC were used to determine the possible DDX52 signaling mechanism in PCa. RESULTS DDX52 expression was upregulated in PCa tissues. Bioinformatics analysis showed that the level of DDX52 further increased in advanced PCa, with a high DDX52 level indicating a poor outcome. In vitro and in vivo experiments showed that downregulating DDX52 impeded the growth of PCa cells. High DDX52 levels contributed to activating c-Myc signaling in PCa patients and PCa cells. Furthermore, DDX52 expression was regulated by c-Myc and positively correlated with c-Myc expression in PCa. CONCLUSION DDX52 was overexpressed in PCa tissues in contrast to normal prostate tissues. DDX52 knockdown repressed the growth of PCa cells in vitro and in vivo. Deleting c-Myc inhibited DDX52 expression, which affected the activation of c-Myc signaling.
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Affiliation(s)
- Wandong Yu
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China
| | - Hangbin Ma
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China
| | - Junhong Li
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China
| | - Jinchao Ge
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China
| | - Pengyu Wang
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China
| | - Yinghao Zhou
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China
| | - Jun Zhang
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Guowei Shi
- Department of Urology, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai, 200240, People's Republic of China.
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Rahman MM, Gutierrez-Jensen AD, Glenn HL, Abrantes M, Moussatche N, McFadden G. RNA Helicase A/DHX9 Forms Unique Cytoplasmic Antiviral Granules That Restrict Oncolytic Myxoma Virus Replication in Human Cancer Cells. J Virol 2021; 95:e0015121. [PMID: 33952639 PMCID: PMC8223942 DOI: 10.1128/jvi.00151-21] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/26/2021] [Indexed: 12/12/2022] Open
Abstract
RNA helicase A/DHX9 is required for diverse RNA-related essential cellular functions and antiviral responses and is hijacked by RNA viruses to support their replication. Here, we show that during the late replication stage in human cancer cells of myxoma virus (MYXV), a member of the double-stranded DNA (dsDNA) poxvirus family that is being developed as an oncolytic virus, DHX9, forms unique granular cytoplasmic structures, which we named "DHX9 antiviral granules." These DHX9 antiviral granules are not formed if MYXV DNA replication and/or late protein synthesis is blocked. When formed, DHX9 antiviral granules significantly reduced nascent protein synthesis in the MYXV-infected cancer cells. MYXV late gene transcription and translation were also significantly compromised, particularly in nonpermissive or semipermissive human cancer cells where MYXV replication is partly or completely restricted. Directed knockdown of DHX9 significantly enhanced viral late protein synthesis and progeny virus formation in normally restrictive cancer cells. We further demonstrate that DHX9 is not a component of the canonical cellular stress granules. DHX9 antiviral granules are induced by MYXV, and other poxviruses, in human cells and are associated with other known cellular components of stress granules, dsRNA and virus encoded dsRNA-binding protein M029, a known interactor with DHX9. Thus, DHX9 antiviral granules function by hijacking poxviral elements needed for the cytoplasmic viral replication factories. These results demonstrate a novel antiviral function for DHX9 that is recruited from the nucleus into the cytoplasm, and this step can be exploited to enhance oncolytic virotherapy against the subset of human cancer cells that normally restrict MYXV. IMPORTANCE The cellular DHX9 has both proviral and antiviral roles against diverse RNA and DNA viruses. In this article, we demonstrate that DHX9 can form unique antiviral granules in the cytoplasm during myxoma virus (MYXV) replication in human cancer cells. These antiviral granules sequester viral proteins and reduce viral late protein synthesis and thus regulate MYXV, and other poxviruses, that replicate in the cytoplasm. In addition, we show that in the absence of DHX9, the formation of DHX9 antiviral granules can be inhibited, which significantly enhanced oncolytic MYXV replication in human cancer cell lines where the virus is normally restricted. Our results also show that DHX9 antiviral granules are formed after viral infection but not by common nonviral cellular stress inducers. Thus, our study suggests that DHX9 has antiviral activity in human cancer cells, and this pathway can be targeted for enhanced activity of oncolytic poxviruses against even restrictive cancer cells.
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Affiliation(s)
- Masmudur M. Rahman
- Center for Immunotherapy, Vaccines, and Virotherapy Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Ami D. Gutierrez-Jensen
- Center for Immunotherapy, Vaccines, and Virotherapy Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Honor L. Glenn
- Center for Immunotherapy, Vaccines, and Virotherapy Biodesign Institute, Arizona State University, Tempe, Arizona, USA
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
| | - Mario Abrantes
- Center for Immunotherapy, Vaccines, and Virotherapy Biodesign Institute, Arizona State University, Tempe, Arizona, USA
| | - Nissin Moussatche
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
| | - Grant McFadden
- Center for Immunotherapy, Vaccines, and Virotherapy Biodesign Institute, Arizona State University, Tempe, Arizona, USA
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Sweet-Jones J, Lenis VP, Yurchenko AA, Yudin NS, Swain M, Larkin DM. Genotyping and Whole-Genome Resequencing of Welsh Sheep Breeds Reveal Candidate Genes and Variants for Adaptation to Local Environment and Socioeconomic Traits. Front Genet 2021; 12:612492. [PMID: 34220925 PMCID: PMC8253514 DOI: 10.3389/fgene.2021.612492] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 05/10/2021] [Indexed: 12/25/2022] Open
Abstract
Background Advances in genetic tools applied to livestock breeding has prompted research into the previously neglected breeds adapted to harsh local environments. One such group is the Welsh mountain sheep breeds, which can be farmed at altitudes of 300 m above sea level but are considered to have a low productive value because of their poor wool quality and small carcass size. This is contrary to the lowland breeds which are more suited to wool and meat production qualities, but do not fare well on upland pasture. Herein, medium-density genotyping data from 317 individuals representing 15 Welsh sheep breeds were used alongside the whole-genome resequencing data of 14 breeds from the same set to scan for the signatures of selection and candidate genetic variants using haplotype- and SNP-based approaches. Results Haplotype-based selection scan performed on the genotyping data pointed to a strong selection in the regions of GBA3, PPARGC1A, APOB, and PPP1R16B genes in the upland breeds, and RNF24, PANK2, and MUC15 in the lowland breeds. SNP-based selection scan performed on the resequencing data pointed to the missense mutations under putative selection relating to a local adaptation in the upland breeds with functions such as angiogenesis (VASH1), anti-oxidation (RWDD1), cell stress (HSPA5), membrane transport (ABCA13 and SLC22A7), and insulin signaling (PTPN1 and GIGFY1). By contrast, genes containing candidate missense mutations in the lowland breeds are related to cell cycle (CDK5RAP2), cell adhesion (CDHR3), and coat color (MC1R). Conclusion We found new variants in genes with potentially functional consequences to the adaptation of local sheep to their environments in Wales. Knowledge of these variations is important for improving the adaptative qualities of UK and world sheep breeds through a marker-assisted selection.
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Affiliation(s)
- James Sweet-Jones
- Royal Veterinary College, University of London, London, United Kingdom
| | - Vasileios Panagiotis Lenis
- Institute of Biological, Environmental and Rural Sciences, University of Aberystwyth, Aberystwyth, United Kingdom.,School of Health and Life Sciences, Teesside University, Middlesbrough, United Kingdom
| | - Andrey A Yurchenko
- The Federal Research Center Institute of Cytology and Genetics, The Siberian Branch of the Russian Academy of Sciences (ICG SB RAS), Novosibirsk, Russia
| | - Nikolay S Yudin
- The Federal Research Center Institute of Cytology and Genetics, The Siberian Branch of the Russian Academy of Sciences (ICG SB RAS), Novosibirsk, Russia
| | - Martin Swain
- Institute of Biological, Environmental and Rural Sciences, University of Aberystwyth, Aberystwyth, United Kingdom
| | - Denis M Larkin
- Royal Veterinary College, University of London, London, United Kingdom.,The Federal Research Center Institute of Cytology and Genetics, The Siberian Branch of the Russian Academy of Sciences (ICG SB RAS), Novosibirsk, Russia
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20
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Myxoma Virus Expressing LIGHT (TNFSF14) Pre-Loaded into Adipose-Derived Mesenchymal Stem Cells Is Effective Treatment for Murine Pancreatic Adenocarcinoma. Cancers (Basel) 2021; 13:cancers13061394. [PMID: 33808692 PMCID: PMC8003548 DOI: 10.3390/cancers13061394] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/17/2021] [Accepted: 03/17/2021] [Indexed: 11/17/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a weakly immunogenic fatal neoplasm. Oncolytic viruses with dual anti-cancer properties-oncolytic and immune response-boosting effects-have great potential for PDAC management. Adipose-derived stem cells (ADSCs) of mesenchymal origin were infected ex vivo with recombinant myxoma virus (MYXV), which encodes murine LIGHT, also called tumor necrosis factor ligand superfamily member 14 (TNFSF14). The viability and proliferation of ADSCs were not remarkably decreased (1-2 days) following MYXV infection, in sharp contrast to cells of pancreatic carcinoma lines studied, which were rapidly killed by the infection. Comparison of the intraperitoneal (IP) vs. the intravenous (IV) route of ADSC/MYXV administration revealed more pancreas-targeted distribution of the virus when ADSCs were delivered IP to mice bearing orthotopically injected PDAC. The biodistribution, tumor burden reduction and anti-tumor adaptive immune response were examined. Bioluminescence data, used to assess the presence of the luciferase-tagged virus after IP injection, indicated enhanced trafficking into the pancreata of mice bearing orthotopically-induced PDAC, as compared to tumor-free animals, resulting in extended survival of the treated PDAC-seeded animals and in the boosted expression of key adaptive immune response markers. We conclude that ADSCs pre-loaded with transgene-armed MYXV and administered IP allow for the effective ferrying of the oncolytic virus to sites of PDAC and mediate improved tumor regression.
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21
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Ali MAM. DEAD-box RNA helicases: The driving forces behind RNA metabolism at the crossroad of viral replication and antiviral innate immunity. Virus Res 2021; 296:198352. [PMID: 33640359 DOI: 10.1016/j.virusres.2021.198352] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 02/22/2021] [Accepted: 02/22/2021] [Indexed: 02/07/2023]
Abstract
DEAD-box RNA helicases, the largest family of superfamily 2 helicases, are a profoundly conserved family of RNA-binding proteins, containing a distinctive Asp-Glu-Ala-Asp (D-E-A-D) sequence motif, which is the origin of their name. Aside from the ATP-dependent unwinding of RNA duplexes, which set up these proteins as RNA helicases, DEAD-box proteins have been found to additionally stimulate RNA duplex fashioning and to uproot proteins from RNA, aiding the reformation of RNA and RNA-protein complexes. There is accumulating evidence that DEAD-box helicases play functions in the recognition of foreign nucleic acids and the modification of viral infection. As intracellular parasites, viruses must avoid identification by innate immune sensing mechanisms and disintegration by cellular machinery, whilst additionally exploiting host cell activities to assist replication. The capability of DEAD-box helicases to sense RNA in a sequence-independent way, as well as the broadness of cellular roles performed by members of this family, drive them to affect innate sensing and viral infections in numerous manners. Undoubtedly, DEAD-box helicases have been demonstrated to contribute to intracellular immune recognition, function as antiviral effectors, and even to be exploited by viruses to support their replication. Relying on the virus or the viral cycle phase, a DEAD-box helicase can function either in a proviral manner or as an antiviral factor. This review gives a comprehensive perspective on the various biochemical characteristics of DEAD-box helicases and their links to structural data. It additionally outlines the multiple functions that members of the DEAD-box helicase family play during viral infections.
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Affiliation(s)
- Mohamed A M Ali
- Department of Biochemistry, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt.
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22
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DHX37 Impacts Prognosis of Hepatocellular Carcinoma and Lung Adenocarcinoma through Immune Infiltration. J Immunol Res 2020; 2020:8835393. [PMID: 33490290 PMCID: PMC7790560 DOI: 10.1155/2020/8835393] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 10/31/2020] [Accepted: 12/17/2020] [Indexed: 12/16/2022] Open
Abstract
Background RNA helicases have various essential functions in basically all aspects of RNA metabolism, not only unwinding RNA but also disturbing the interaction of RNA with proteins. Recently, RNA helicases have been considered potential targets in cancers. So far, there has been no detailed investigation of the biological functions of RNA helicase DHX37 in cancers. Objective We aim to identify the prognostic value of DHX37 associated with tumor microenvironments in cancers. Methods DHX37 expression was examined via the Oncomine database and Tumor Immune Estimation Resource (TIMER). We explored the prognostic role of DHX37 in cancers across various databases. Coexpression genes, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG), and fundamental regulators were performed via LinkedOmics. Confirming the prognostic value of DHX37 in liver hepatocellular carcinoma (LIHC) and lung adenocarcinoma (LUAD), we explored the role of DHX37 in infiltrated lymphocytes in cancers using the Gene Expression Profiling Interactive Analysis (GEPIA) and TIMER databases. Results Through GO and KEGG analyses, expression of DHX37 was also correlated with complex function-specific networks involving the ribosome and RNA metabolic signaling pathways. In LIHC and LUAD, DHX37 expression showed significant positive correlations with markers of Tregs, myeloid-derived suppressor cells (MDSCs), and T cell exhaustion, contributing to immune tolerance. Conclusion These results indicate that DHX37 can serve as a prognostic biomarker in LIHC and LUAD while having an important role in immune tolerance by activating the function of Tregs, MDSC, and T cell exhaustion.
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Mohamadi A, Pagès G, Hashemzadeh MS. The Important Role of Oncolytic Viruses in Common Cancer Treatments. CURRENT CANCER THERAPY REVIEWS 2020. [DOI: 10.2174/1573394716666200211120906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Oncolytic viruses (OV) are considered as promising tools in cancer treatment. In addition
to direct cytolysis, the stimulation of both innate and adaptive immune responses is the most
important mechanism in oncolytic virotherapy that finally leads to the long-standing tumor retardations
in the advanced melanoma clinical trials. The OVs have become a worthy method in cancer
treatment, due to their several biological advantages including (1) the selective replication in
cancer cells without affecting normal cells; (2) the lack of resistance to the treatment; (3) cancer
stem cell targeting; (4) the ability to be spread; and (5) the immune response induction against the
tumors. Numerous types of viruses; for example, Herpes simplex viruses, Adenoviruses, Reoviruses,
Poliovirus, and Newcastle disease virus have been studied as a possible cancer treatment
strategy. Although some viruses have a natural orientation or tropism to cancer cells, several others
need attenuation and genetic manipulation to increase the safety and tumor-specific replication activity.
Two important mechanisms are involved in OV antitumor responses, which include the tumor
cell death due to virus replication, and also induction of immunogenic cell death as a result of
the immune system responses against the tumor cells. Furthermore, the high efficiency of OV on
antitumor immune response stimulation can finally lead to a significant tumor shrinkage.
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Affiliation(s)
- Amir Mohamadi
- Applied Virology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Gilles Pagès
- Centre Antoine Lacassagne, University of Cote d’Azur, Nice, France
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24
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Pan YQ, Xing L. The Current View on the Helicase Activity of RNA Helicase A and Its Role in Gene Expression. Curr Protein Pept Sci 2020; 22:29-40. [PMID: 33143622 DOI: 10.2174/1389203721666201103084122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 08/18/2020] [Accepted: 09/09/2020] [Indexed: 11/22/2022]
Abstract
RNA helicase A (RHA) is a DExH-box helicase that plays regulatory roles in a variety of cellular processes, including transcription, translation, RNA splicing, editing, transport, and processing, microRNA genesis and maintenance of genomic stability. It is involved in virus replication, oncogenesis, and innate immune response. RHA can unwind nucleic acid duplex by nucleoside triphosphate hydrolysis. The insight into the molecular mechanism of helicase activity is fundamental to understanding the role of RHA in the cell. Herein, we reviewed the current advances on the helicase activity of RHA and its relevance to gene expression, particularly, to the genesis of circular RNA.
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Affiliation(s)
- Yuan-Qing Pan
- Institute of Biomedical Sciences, Shanxi University, 92 Wucheng Road, Taiyuan 030006, Shanxi province, China
| | - Li Xing
- Institute of Biomedical Sciences, Shanxi University, 92 Wucheng Road, Taiyuan 030006, Shanxi province, China
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25
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Gulliver C, Hoffmann R, Baillie GS. The enigmatic helicase DHX9 and its association with the hallmarks of cancer. Future Sci OA 2020; 7:FSO650. [PMID: 33437516 PMCID: PMC7787180 DOI: 10.2144/fsoa-2020-0140] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/20/2020] [Indexed: 12/16/2022] Open
Abstract
Much interest has been expended lately in characterizing the association between DExH-Box helicase 9 (DHX9) dysregulation and malignant development, however, the enigmatic nature of DHX9 has caused conflict as to whether it regularly functions as an oncogene or tumor suppressor. The impact of DHX9 on malignancy appears to be cell-type specific, dependent upon the availability of binding partners and activation of inter-connected signaling pathways. Realization of DHX9's pivotal role in the development of several hallmarks of cancer has boosted the enzyme's potential as a cancer biomarker and therapeutic target, opening up novel avenues for exploring DHX9 in precision medicine applications. Our review discusses the ascribed functions of DHX9 in cancer, explores its enigmatic nature and potential as an antineoplastic target.
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Affiliation(s)
- Chloe Gulliver
- Institute of Cardiovascular & Medical Science, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow, UK
| | - Ralf Hoffmann
- Institute of Cardiovascular & Medical Science, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow, UK
- Philips Research Europe, High Tech Campus, Eindhoven, The Netherlands
| | - George S Baillie
- Institute of Cardiovascular & Medical Science, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow, UK
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26
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Guo F, Xing L. RNA helicase A as co-factor for DNA viruses during replication. Virus Res 2020; 291:198206. [PMID: 33132162 DOI: 10.1016/j.virusres.2020.198206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 10/17/2020] [Accepted: 10/19/2020] [Indexed: 11/30/2022]
Abstract
RNA helicase A (RHA) is a ubiquitously expressed DExH-box helicase enzyme that is involved in a wide range of biological processes including transcription, translation, and RNA processing. A number of RNA viruses recruit RHA to the viral RNA to facilitate virus replication. DNA viruses contain a DNA genome and replicate using a DNA-dependent DNA polymerase. RHA has also been reported to associate with some DNA viruses during replication, in which the enzyme acts on the viral RNA or protein products. As shown for Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus, RHA has potential to allow the virus to control a switch in cellular gene expression to modulate the antiviral response. While the study of the interaction of RHA with DNA viruses is still at an early stage, preliminary evidence indicates that the underlying molecular mechanisms are diverse. We now review the current status of this emerging field.
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Affiliation(s)
- Fan Guo
- Institute of Biomedical Sciences, Shanxi University, 92 Wucheng Road, Taiyuan 030006, Shanxi province, PR China
| | - Li Xing
- Institute of Biomedical Sciences, Shanxi University, 92 Wucheng Road, Taiyuan 030006, Shanxi province, PR China.
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27
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Mani SKK, Yan B, Cui Z, Sun J, Utturkar S, Foca A, Fares N, Durantel D, Lanman N, Merle P, Kazemian M, Andrisani O. Restoration of RNA helicase DDX5 suppresses hepatitis B virus (HBV) biosynthesis and Wnt signaling in HBV-related hepatocellular carcinoma. Theranostics 2020; 10:10957-10972. [PMID: 33042264 PMCID: PMC7532671 DOI: 10.7150/thno.49629] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 08/11/2020] [Indexed: 02/07/2023] Open
Abstract
Rationale: RNA helicase DDX5 is downregulated during hepatitis B virus (HBV) replication, and poor prognosis HBV-related hepatocellular carcinoma (HCC). The aim of this study is to determine the mechanism and significance of DDX5 downregulation for HBV-driven HCC, and identify biologics to prevent DDX5 downregulation. Methods: Molecular approaches including immunoblotting, qRT-PCR, luciferase transfections, hepatosphere assays, Assay for Transposase-Accessible Chromatin sequencing (ATAC-seq), and RNA-seq were used with cellular models of HBV replication, HBV infection, and HBV-related liver tumors, as well as bioinformatic analyses of liver cancer cells from two independent cohorts. Results: We demonstrate that HBV infection induces expression of the proto-oncogenic miR17~92 and miR106b~25 clusters which target the downregulation of DDX5. Increased expression of these miRNAs is also detected in HBV-driven HCCs exhibiting reduced DDX5 mRNA. Stable DDX5 knockdown (DDX5KD) in HBV replicating hepatocytes increased viral replication, and resulted in hepatosphere formation, drug resistance, Wnt activation, and pluripotency gene expression. ATAC-seq of DDX5KD compared to DDX5 wild-type (WT) cells identified accessible chromatin regions enriched in regulation of Wnt signaling genes. RNA-seq analysis comparing WT versus DDX5KD cells identified enhanced expression of multiple genes involved in Wnt pathway. Additionally, expression of Disheveled, DVL1, a key regulator of Wnt pathway activation, was significantly higher in liver cancer cells with low DDX5 expression, from two independent cohorts. Importantly, inhibitors (antagomirs) to miR17~92 and miR106b~25 restored DDX5 levels, reduced DVL1 expression, and suppressed both Wnt activation and viral replication. Conclusion : DDX5 is a negative regulator of Wnt signaling and hepatocyte reprogramming in HCCs. Restoration of DDX5 levels by miR17~92 / miR106b~25 antagomirs in HBV-infected patients can be explored as both antitumor and antiviral strategy.
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Myxoma Virus-Encoded Host Range Protein M029: A Multifunctional Antagonist Targeting Multiple Host Antiviral and Innate Immune Pathways. Vaccines (Basel) 2020; 8:vaccines8020244. [PMID: 32456120 PMCID: PMC7349962 DOI: 10.3390/vaccines8020244] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 05/19/2020] [Accepted: 05/22/2020] [Indexed: 12/21/2022] Open
Abstract
Myxoma virus (MYXV) is the prototypic member of the Leporipoxvirus genus of the Poxviridae family of viruses. In nature, MYXV is highly restricted to leporids and causes a lethal disease called myxomatosis only in European rabbits (Oryctologous cuniculus). However, MYXV has been shown to also productively infect various types of nonrabbit transformed and cancer cells in vitro and in vivo, whereas their normal somatic cell counterparts undergo abortive infections. This selective tropism of MYXV for cancer cells outside the rabbit host has facilitated its development as an oncolytic virus for the treatment of different types of cancers. Like other poxviruses, MYXV possesses a large dsDNA genome which encodes an array of dozens of immunomodulatory proteins that are important for host and cellular tropism and modulation of host antiviral innate immune responses, some of which are rabbit-specific and others can function in nonrabbit cells as well. This review summarizes the functions of one such MYXV host range protein, M029, an ortholog of the larger superfamily of poxvirus encoded E3-like dsRNA binding proteins. M029 has been identified as a multifunctional protein involved in MYXV cellular and host tropism, antiviral responses, and pathogenicity in rabbits.
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Kamjula V, Kanneganti A, Metla R, Nidamanuri K, Idupulapati S, Runthala A. Decoding the vital segments in human ATP-dependent RNA helicase. Bioinformation 2020; 16:160-170. [PMID: 32405168 PMCID: PMC7196165 DOI: 10.6026/97320630016160] [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: 01/22/2020] [Accepted: 02/20/2020] [Indexed: 12/28/2022] Open
Abstract
An analysis of the ATP-dependent RNA helicase using known functionally close analogs helps disclose the structural and functional information of the enzyme. The enzyme plays several interlinked biological functions and there is an urgent need to interpret its key active-site residues to infer function and establish role. The human protein q96c10.1 is annotated using tools such as interpro, go and cdd. The physicochemical properties are estimated using the tool protparam. We describe the enzyme protein model developed using modeller to identify active site residues. We used consurf to estimate the structural conservation and is evolutionary relationship is inferred using known close sequence homologs. The active site is predicted using castp and its topological flexibility is estimated through cabs-flex. The protein is annotated as a hydrolase using available data and ddx58 is found as its top-ranked interacting protein partner. We show that about 124 residues are found to be highly conserved among 259 homologs, clustered in 7 clades with the active-site showing low sequence conservation. It is further shown that only 9 loci among the 42 active-site residues are conserved with limited structural fluctuation from the wild type structure. Thus, we document various useful information linked to function, sequence similarity and phylogeny of the enzyme for annotation as potential helicase as designated by uniprot. Data shows limited degree of conserved sequence segments with topological flexibility unlike in other subfamily members of the protein.
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Affiliation(s)
- Vandana Kamjula
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
| | - Ananya Kanneganti
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
| | - Rohan Metla
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
| | - Kusuma Nidamanuri
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
| | - Sudarshan Idupulapati
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
| | - Ashish Runthala
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
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Hadryś A, Sochanik A, McFadden G, Jazowiecka-Rakus J. Mesenchymal stem cells as carriers for systemic delivery of oncolytic viruses. Eur J Pharmacol 2020; 874:172991. [PMID: 32044323 DOI: 10.1016/j.ejphar.2020.172991] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 01/09/2020] [Accepted: 02/04/2020] [Indexed: 12/13/2022]
Abstract
Progress in genetic engineering led to the emergence of some viruses as potent anticancer therapeutics. These oncolytic viruses combine self-amplification with dual antitumor action: oncolytic (destruction of cancer cells) and immunostimulatory (eliciting acquired antitumor response against cancer epitopes). As any other viruses, they trigger antiviral response upon systemic administration. Mesenchymal stem cells are immature cells capable of self-renewing and differentiating into many cell types that belong to three germinal layers. Due to their inherent tumor tropism mesenchymal stem cells loaded with oncolytic virus can improve delivery of the therapeutic cargo to cancer sites. Shielding of oncolytic viral construct from antiviral host immune response makes these cells prospective delivery vehicles to even hard-to-reach metastatic neoplastic foci. Use of mesenchymal stem cells has been criticized by some investigators as limiting proliferative abilities of primary cells and increasing the risk of malignant transformation, as well as attenuating therapeutic responses. However, majority of preclinical studies indicate safety and efficacy of mesenchymal stem cells used as carriers of oncolytic viruses. In view of contradictory postulates, the debate continues. The review discusses mesenchymal stem cells as carriers for delivery of genetically engineered oncolytic constructs and focuses on systemic approach to oncoviral treatment of some deadly neoplasms.
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Affiliation(s)
- Agata Hadryś
- Maria Sklodowska-Curie National Research Institute of Oncology, Gliwice, Poland; Institute of Chemistry, University of Silesia, Poland.
| | - Aleksander Sochanik
- Maria Sklodowska-Curie National Research Institute of Oncology, Gliwice, Poland.
| | - Grant McFadden
- Biodesign Institute, Arizona State University, Tempe, AZ, USA.
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DEAD-Box Helicases: Sensors, Regulators, and Effectors for Antiviral Defense. Viruses 2020; 12:v12020181. [PMID: 32033386 PMCID: PMC7077277 DOI: 10.3390/v12020181] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/29/2020] [Accepted: 01/31/2020] [Indexed: 12/13/2022] Open
Abstract
DEAD-box helicases are a large family of conserved RNA-binding proteins that belong to the broader group of cellular DExD/H helicases. Members of the DEAD-box helicase family have roles throughout cellular RNA metabolism from biogenesis to decay. Moreover, there is emerging evidence that cellular RNA helicases, including DEAD-box helicases, play roles in the recognition of foreign nucleic acids and the modulation of viral infection. As intracellular parasites, viruses must evade detection by innate immune sensing mechanisms and degradation by cellular machinery while also manipulating host cell processes to facilitate replication. The ability of DEAD-box helicases to recognize RNA in a sequence-independent manner, as well as the breadth of cellular functions carried out by members of this family, lead them to influence innate recognition and viral infections in multiple ways. Indeed, DEAD-box helicases have been shown to contribute to intracellular immune sensing, act as antiviral effectors, and even to be coopted by viruses to promote their replication. However, our understanding of the mechanisms underlying these interactions, as well as the cellular roles of DEAD-box helicases themselves, is limited in many cases. We will discuss the diverse roles that members of the DEAD-box helicase family play during viral infections.
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Rahman MM, McFadden G. Oncolytic Virotherapy with Myxoma Virus. J Clin Med 2020; 9:jcm9010171. [PMID: 31936317 PMCID: PMC7020043 DOI: 10.3390/jcm9010171] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 12/25/2019] [Accepted: 01/03/2020] [Indexed: 02/07/2023] Open
Abstract
Oncolytic viruses are one of the most promising novel therapeutics for malignant cancers. They selectively infect and kill cancer cells while sparing the normal counterparts, expose cancer- specific antigens and activate the host immune system against both viral and tumor determinants. Oncolytic viruses can be used as monotherapy or combined with existing cancer therapies to become more potent. Among the many types of oncolytic viruses that have been developed thus far, members of poxviruses are the most promising candidates against diverse cancer types. This review summarizes recent advances that are made with oncolytic myxoma virus (MYXV), a member of the Leporipoxvirus genus. Unlike other oncolytic viruses, MYXV infects only rabbits in nature and causes no harm to humans or any other non-leporid animals. However, MYXV can selectively infect and kill cancer cells originating from human, mouse and other host species. This selective cancer tropism and safety profile have led to the testing of MYXV in various types of preclinical cancer models. The next stage will be successful GMP manufacturing and clinical trials that will bring MYXV from bench to bedside for the treatment of currently intractable malignancies.
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Kellish P, Shabashvili D, Rahman MM, Nawab A, Guijarro MV, Zhang M, Cao C, Moussatche N, Boyle T, Antonia S, Reinhard M, Hartzell C, Jantz M, Mehta HJ, McFadden G, Kaye FJ, Zajac-Kaye M. Oncolytic virotherapy for small-cell lung cancer induces immune infiltration and prolongs survival. J Clin Invest 2019; 129:2279-2292. [PMID: 31033480 DOI: 10.1172/jci121323] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 03/14/2019] [Indexed: 12/14/2022] Open
Abstract
Oncolytic virotherapy has been proposed as an ablative and immunostimulatory treatment strategy for solid tumors that are resistant to immunotherapy alone; however, there is a need to optimize host immune activation using preclinical immunocompetent models in previously untested common adult tumors. We studied a modified oncolytic myxoma virus (MYXV) that shows high efficiency for tumor-specific cytotoxicity in small-cell lung cancer (SCLC), a neuroendocrine carcinoma with high mortality and modest response rates to immune checkpoint inhibitors. Using an immunocompetent SCLC mouse model, we demonstrated the safety of intrapulmonary MYXV delivery with efficient tumor-specific viral replication and cytotoxicity associated with induction of immune cell infiltration. We observed increased SCLC survival following intrapulmonary MYXV that was enhanced by combined low-dose cisplatin. We also tested intratumoral MYXV delivery and observed immune cell infiltration associated with tumor necrosis and growth inhibition in syngeneic murine allograft tumors. Freshly collected primary human SCLC tumor cells were permissive to MYXV and intratumoral delivery into patient-derived xenografts resulted in extensive tumor necrosis. We confirmed MYXV cytotoxicity in classic and variant SCLC subtypes as well as cisplatin-resistant cells. Data from 26 SCLC human patients showed negligible immune cell infiltration, supporting testing MYXV as an ablative and immune-enhancing therapy.
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Affiliation(s)
| | | | | | | | | | - Min Zhang
- Department of Medicine, University of Florida, Gainesville, Florida, USA
| | - Chunxia Cao
- Department of Medicine, University of Florida, Gainesville, Florida, USA
| | | | | | | | - Mary Reinhard
- Department of Veterinary Pathology, University of Florida, Gainesville, Florida, USA
| | | | - Michael Jantz
- Department of Medicine, University of Florida, Gainesville, Florida, USA
| | - Hiren J Mehta
- Department of Medicine, University of Florida, Gainesville, Florida, USA
| | | | - Frederic J Kaye
- Department of Medicine, University of Florida, Gainesville, Florida, USA
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Abstract
INTRODUCTION Over the last decade, advances in biological therapies have resulted in remarkable clinical responses for the treatment of some previously incurable cancers. Oncolytic virotherapy is one of these promising novel strategies for cancer therapy. A successful oncolytic virus promotes tumor cell oncolysis and elicits a robust long-term anti-tumor immunity. AREAS COVERED Oncolytic poxviruses (Vaccinia virus and Myxoma virus) demonstrated encouraging results in multiple pre-clinical tumor models and some clinical trials for the treatment of various cancers. This review summarizes the advances made on poxvirus oncolytic virotherapy in the last five years. EXPERT OPINION Many challenges remain in poxvirus oncolytic virotherapy. Two key goals to achieve are enhancing the efficiency of viral delivery to tumor sites and overcoming local tumor immune-evasion. Additional efforts are necessary to explore the best combination of virotherapy with standard available treatments, particularly immunotherapies. By addressing these issues, this new modality will continue to improve as an adjunct biotherapy to treat malignant diseases.
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Affiliation(s)
- Lino E Torres-Domínguez
- a Biodesign Center for Immunotherapy, Vaccines and Virotherapy , Arizona State University , Tempe , AZ , USA
| | - Grant McFadden
- a Biodesign Center for Immunotherapy, Vaccines and Virotherapy , Arizona State University , Tempe , AZ , USA
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Cellular RNA Helicase DHX9 Interacts with the Essential Epstein-Barr Virus (EBV) Protein SM and Restricts EBV Lytic Replication. J Virol 2019; 93:JVI.01244-18. [PMID: 30541834 DOI: 10.1128/jvi.01244-18] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 11/28/2018] [Indexed: 12/11/2022] Open
Abstract
Epstein-Barr virus (EBV) SM protein is an RNA-binding protein that has multiple posttranscriptional gene regulatory functions essential for EBV lytic replication. In this study, we identified an interaction between SM and DHX9, a DExH-box helicase family member, by mass spectrometry and coimmunoprecipitation. DHX9 participates in many cellular pathways involving RNA, including transcription, processing, transport, and translation. DHX9 enhances virus production or infectivity of a wide variety of DNA and RNA viruses. Surprisingly, an increase in EBV late gene expression and virion production occurred upon knockdown of DHX9. To further characterize the SM-DHX9 interaction, we performed immunofluorescence microscopy of EBV-infected cells and found that DHX9 partially colocalized with SM in nuclear foci during EBV lytic replication. However, the positive effect of DHX9 depletion on EBV lytic gene expression was not confined to SM-dependent genes, indicating that the antiviral effect of DHX9 was not mediated through its effects on SM. DHX9 enhanced activation of innate antiviral pathways comprised of several interferon-stimulated genes that are active against EBV. SM inhibited the transcription-activating function of DHX9, which acts through cAMP response elements (CREs), suggesting that SM may also act to counteract DHX9's antiviral functions during lytic replication.IMPORTANCE This study identifies an interaction between Epstein-Barr virus (EBV) SM protein and cellular helicase DHX9, exploring the roles that this interaction plays in viral infection and host defenses. Whereas most previous studies established DHX9 as a proviral factor, we demonstrate that DHX9 may act as an inhibitor of EBV virion production. DHX9 enhanced innate antiviral pathways active against EBV and was needed for maximal expression of several interferon-induced genes. We show that SM binds to and colocalizes DHX9 and may counteract the antiviral function of DHX9. These data indicate that DHX9 possesses antiviral activity and that SM may suppress the antiviral functions of DHX9 through this association. Our study presents a novel host-pathogen interaction between EBV and the host cell.
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Brachtlova T, van Beusechem VW. Unleashing the Full Potential of Oncolytic Adenoviruses against Cancer by Applying RNA Interference: The Force Awakens. Cells 2018; 7:cells7120228. [PMID: 30477117 PMCID: PMC6315459 DOI: 10.3390/cells7120228] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 11/19/2018] [Accepted: 11/21/2018] [Indexed: 12/23/2022] Open
Abstract
Oncolytic virus therapy of cancer is an actively pursued field of research. Viruses that were once considered as pathogens threatening the wellbeing of humans and animals alike are with every passing decade more prominently regarded as vehicles for genetic and oncolytic therapies. Oncolytic viruses kill cancer cells, sparing healthy tissues, and provoke an anticancer immune response. Among these viruses, recombinant adenoviruses are particularly attractive agents for oncolytic immunotherapy of cancer. Different approaches are currently examined to maximize their therapeutic effect. Here, knowledge of virus–host interactions may lead the way. In this regard, viral and host microRNAs are of particular interest. In addition, cellular factors inhibiting viral replication or dampening immune responses are being discovered. Therefore, applying RNA interference is an attractive approach to strengthen the anticancer efficacy of oncolytic viruses gaining attention in recent years. RNA interference can be used to fortify the virus’ cancer cell-killing and immune-stimulating properties and to suppress cellular pathways to cripple the tumor. In this review, we discuss different ways of how RNA interference may be utilized to increase the efficacy of oncolytic adenoviruses, to reveal their full potential.
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Affiliation(s)
- Tereza Brachtlova
- Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Cancer Center Amsterdam, De Boelelaan 1117, 1007 MB Amsterdam, The Netherlands.
| | - Victor W van Beusechem
- Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Cancer Center Amsterdam, De Boelelaan 1117, 1007 MB Amsterdam, The Netherlands.
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Matz KM, Guzman RM, Goodman AG. The Role of Nucleic Acid Sensing in Controlling Microbial and Autoimmune Disorders. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2018; 345:35-136. [PMID: 30904196 PMCID: PMC6445394 DOI: 10.1016/bs.ircmb.2018.08.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Innate immunity, the first line of defense against invading pathogens, is an ancient form of host defense found in all animals, from sponges to humans. During infection, innate immune receptors recognize conserved molecular patterns, such as microbial surface molecules, metabolites produces during infection, or nucleic acids of the microbe's genome. When initiated, the innate immune response activates a host defense program that leads to the synthesis proteins capable of pathogen killing. In mammals, the induction of cytokines during the innate immune response leads to the recruitment of professional immune cells to the site of infection, leading to an adaptive immune response. While a fully functional innate immune response is crucial for a proper host response and curbing microbial infection, if the innate immune response is dysfunctional and is activated in the absence of infection, autoinflammation and autoimmune disorders can develop. Therefore, it follows that the innate immune response must be tightly controlled to avoid an autoimmune response from host-derived molecules, yet still unencumbered to respond to infection. In this review, we will focus on the innate immune response activated from cytosolic nucleic acids, derived from the microbe or host itself. We will depict how viruses and bacteria activate these nucleic acid sensing pathways and their mechanisms to inhibit the pathways. We will also describe the autoinflammatory and autoimmune disorders that develop when these pathways are hyperactive. Finally, we will discuss gaps in knowledge with regard to innate immune response failure and identify where further research is needed.
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Affiliation(s)
- Keesha M Matz
- School of Molecular Biosciences, College of Veterinary Medicine, Washington State University, Pullman, WA, United States
| | - R Marena Guzman
- School of Molecular Biosciences, College of Veterinary Medicine, Washington State University, Pullman, WA, United States
| | - Alan G Goodman
- School of Molecular Biosciences, College of Veterinary Medicine, Washington State University, Pullman, WA, United States; Paul G. Allen School for Global Animal Health, College of Veterinary Medicine, Washington State University, Pullman, WA, United States.
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Cheng W, Chen G, Jia H, He X, Jing Z. DDX5 RNA Helicases: Emerging Roles in Viral Infection. Int J Mol Sci 2018; 19:ijms19041122. [PMID: 29642538 PMCID: PMC5979547 DOI: 10.3390/ijms19041122] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Revised: 03/29/2018] [Accepted: 04/02/2018] [Indexed: 02/07/2023] Open
Abstract
Asp-Glu-Ala-Asp (DEAD)-box polypeptide 5 (DDX5), also called p68, is a prototypical member of the large ATP-dependent RNA helicases family and is known to participate in all aspects of RNA metabolism ranging from transcription to translation, RNA decay, and miRNA processing. The roles of DDX5 in cell cycle regulation, tumorigenesis, apoptosis, cancer development, adipogenesis, Wnt-β-catenin signaling, and viral infection have been established. Several RNA viruses have been reported to hijack DDX5 to facilitate various steps of their replication cycles. Furthermore, DDX5 can be bounded by the viral proteins of some viruses with unknown functions. Interestingly, an antiviral function of DDX5 has been reported during hepatitis B virus and myxoma virus infection. Thus, the precise roles of this apparently multifaceted protein remain largely obscure. Here, we provide a rapid and critical overview of the structure and functions of DDX5 with a particular emphasis on its role during virus infection.
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Affiliation(s)
- Wenyu Cheng
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China.
| | - Guohua Chen
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China.
| | - Huaijie Jia
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China.
| | - Xiaobing He
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China.
| | - Zhizhong Jing
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Public Health of Agriculture Ministry, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China.
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