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Kawano K, Hashikura Y, Umekita K. Purification Method of Extracellular Vesicles Derived from Human T-Cell Leukemia Virus Type 1-Infected Cells without Virions. Viruses 2024; 16:249. [PMID: 38400025 PMCID: PMC10892183 DOI: 10.3390/v16020249] [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: 11/17/2023] [Revised: 01/19/2024] [Accepted: 02/01/2024] [Indexed: 02/25/2024] Open
Abstract
To mediate intercellular communication, cells produce extracellular vesicles (EVs). These EVs transport many biomolecules such as proteins, nucleic acids, and lipids between cells and regulate pathophysiological actions in the recipient cell. However, EVs and virus particles produced from virus-infected cells are of similar size and specific gravity; therefore, the separation and purification of these two particles is often controversial. When analyzing the physiological functions of EVs from virus-infected cells, the presence or absence of virus particle contamination must always be verified. The human T-cell leukemia virus type 1 (HTLV-1)-infected cell line, MT-2, produces EVs and virus particles. Here, we validated a method for purifying EVs from MT-2 cell culture supernatants while avoiding HTLV-1 viral particle contamination. EV fractions were collected using a combination of immunoprecipitation with Tim-4, which binds to phosphatidylserine, and polymer precipitation. The HTLV-1 viral envelope protein, gp46, was not detected in the EV fraction. Proteomic analysis revealed that EV-constituted proteins were predominant in this EV fraction. Furthermore, the EVs were found to contain the HTLV-1 viral genome. The proposed method can purify EVs while avoiding virus particle contamination and is expected to contribute to future research on EVs derived from HTLV-1-infected cells.
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Affiliation(s)
- Katsumi Kawano
- Division of Respirology, Rheumatology, Infectious Diseases and Neurology, Department of Internal Medicine, University of Miyazaki, Kihara 5200, Kiyotake, Miyazaki 889-1692, Japan;
- Clinical Laboratory, University of Miyazaki of Hospital, Kihara 5200, Kiyotake, Miyazaki 889-1692, Japan;
| | - Yuki Hashikura
- Clinical Laboratory, University of Miyazaki of Hospital, Kihara 5200, Kiyotake, Miyazaki 889-1692, Japan;
| | - Kunihiko Umekita
- Division of Respirology, Rheumatology, Infectious Diseases and Neurology, Department of Internal Medicine, University of Miyazaki, Kihara 5200, Kiyotake, Miyazaki 889-1692, Japan;
- Clinical Laboratory, University of Miyazaki of Hospital, Kihara 5200, Kiyotake, Miyazaki 889-1692, Japan;
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A Comprehensive Insight into the Role of Exosomes in Viral Infection: Dual Faces Bearing Different Functions. Pharmaceutics 2021; 13:pharmaceutics13091405. [PMID: 34575480 PMCID: PMC8466084 DOI: 10.3390/pharmaceutics13091405] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 08/31/2021] [Accepted: 09/02/2021] [Indexed: 12/13/2022] Open
Abstract
Extracellular vesicles (EVs) subtype, exosome is an extracellular nano-vesicle that sheds from cells’ surface and originates as intraluminal vesicles during endocytosis. Firstly, it was thought to be a way for the cell to get rid of unwanted materials as it loaded selectively with a variety of cellular molecules, including RNAs, proteins, and lipids. However, it has been found to play a crucial role in several biological processes such as immune modulation, cellular communication, and their role as vehicles to transport biologically active molecules. The latest discoveries have revealed that many viruses export their viral elements within cellular factors using exosomes. Hijacking the exosomal pathway by viruses influences downstream processes such as viral propagation and cellular immunity and modulates the cellular microenvironment. In this manuscript, we reviewed exosomes biogenesis and their role in the immune response to viral infection. In addition, we provided a summary of how some pathogenic viruses hijacked this normal physiological process. Viral components are harbored in exosomes and the role of these exosomes in viral infection is discussed. Understanding the nature of exosomes and their role in viral infections is fundamental for future development for them to be used as a vaccine or as a non-classical therapeutic strategy to control several viral infections.
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Kim Y, Mensah GA, Al Sharif S, Pinto DO, Branscome H, Yelamanchili SV, Cowen M, Erickson J, Khatkar P, Mahieux R, Kashanchi F. Extracellular Vesicles from Infected Cells Are Released Prior to Virion Release. Cells 2021; 10:cells10040781. [PMID: 33916140 PMCID: PMC8066806 DOI: 10.3390/cells10040781] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 03/24/2021] [Accepted: 03/29/2021] [Indexed: 12/29/2022] Open
Abstract
Here, we have attempted to address the timing of EV and virion release from virally infected cells. Uninfected (CEM), HIV-1-infected (J1.1), and human T cell leukemia virus-1 (HTLV-1)-infected (HUT102) cells were synchronized in G0. Viral latency was reversed by increasing gene expression with the addition of serum-rich media and inducers. Supernatants and cell pellets were collected post-induction at different timepoints and assayed for extracellular vesicle (EV) and autophagy markers; and for viral proteins and RNAs. Tetraspanins and autophagy-related proteins were found to be differentially secreted in HIV-1- and HTLV-1-infected cells when compared with uninfected controls. HIV-1 proteins were present at 6 h and their production increased up to 24 h. HTLV-1 proteins peaked at 6 h and plateaued. HIV-1 and HTLV-1 RNA production correlated with viral protein expression. Nanoparticle tracking analysis (NTA) showed increase of EV concentration over time in both uninfected and infected samples. Finally, the HIV-1 supernatant from the 6-h samples was found not to be infectious; however, the virus from the 24-h samples was successfully rescued and infectious. Overall, our data indicate that EV release may occur prior to viral release from infected cells, thereby implicating a potentially significant effect of EVs on uninfected recipient cells prior to subsequent viral infection and spread.
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Affiliation(s)
- Yuriy Kim
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - Gifty A. Mensah
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - Sarah Al Sharif
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - Daniel O. Pinto
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - Heather Branscome
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - Sowmya V. Yelamanchili
- Department of Anesthesiology, University of Nebraska Medical Center, Omaha, NE 68198, USA;
| | - Maria Cowen
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - James Erickson
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - Pooja Khatkar
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
| | - Renaud Mahieux
- International Center for Research in Infectiology, Retroviral Oncogenesis Laboratory, INSERM U1111-Université Claude Bernard Lyon 1, Ecole Normale Superieure de Lyon, Université de Lyon, Fondation Pour La Recherche Médicale, Labex Ecofect, 69007 Lyon, France;
| | - Fatah Kashanchi
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA 20110, USA; (Y.K.); (G.A.M.); (S.A.S.); (D.O.P.); (H.B.); (M.C.); (J.E.); (P.K.)
- Correspondence: ; Tel.: +703-993-9160; Fax: +703-993-7022
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Rezaie J, Aslan C, Ahmadi M, Zolbanin NM, Kashanchi F, Jafari R. The versatile role of exosomes in human retroviral infections: from immunopathogenesis to clinical application. Cell Biosci 2021; 11:19. [PMID: 33451365 PMCID: PMC7810184 DOI: 10.1186/s13578-021-00537-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 01/09/2021] [Indexed: 02/06/2023] Open
Abstract
Eukaryotic cells produce extracellular vesicles (EVs) mediating intercellular communication. These vesicles encompass many bio-molecules such as proteins, nucleic acids, and lipids that are transported between cells and regulate pathophysiological actions in the recipient cell. Exosomes originate from multivesicular bodies inside cells and microvesicles shed from the plasma membrane and participate in various pathological conditions. Retroviruses such as Human Immunodeficiency Virus -type 1 (HIV-1) and Human T-cell leukemia virus (HTLV)-1 engage exosomes for spreading and infection. Exosomes from virus-infected cells transfer viral components such as miRNAs and proteins that promote infection and inflammation. Additionally, these exosomes deliver virus receptors to target cells that make them susceptible to virus entry. HIV-1 infected cells release exosomes that contribute to the pathogenesis including neurological disorders and malignancy. Exosomes can also potentially carry out as a modern approach for the development of HIV-1 and HTLV-1 vaccines. Furthermore, as exosomes are present in most biological fluids, they hold the supreme capacity for clinical usage in the early diagnosis and prognosis of viral infection and associated diseases. Our current knowledge of exosomes' role from virus-infected cells may provide an avenue for efficient retroviruses associated with disease prevention. However, the exact mechanism involved in retroviruses infection/ inflammation remains elusive and related exosomes research will shed light on the mechanisms of pathogenesis.
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Affiliation(s)
- Jafar Rezaie
- Solid Tumor Research Center, Cellular and Molecular Medicine Research Institute, Urmia University of Medical Sciences, Shafa St, Ershad Blvd., P.O. Box: 1138, 57147, Urmia, Iran
| | - Cynthia Aslan
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mahdi Ahmadi
- Tuberculosis and Lung Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Naime Majidi Zolbanin
- Department of Pharmacology and Toxicology, School of Pharmacy, Urmia University of Medical Sciences, Urmia, Iran
| | - Fatah Kashanchi
- School of Systems Biology, Laboratory of Molecular Virology, George Mason University, Discovery Hall Room 182, 10900 University Blvd., Manassas, VA, 20110, USA.
| | - Reza Jafari
- Solid Tumor Research Center, Cellular and Molecular Medicine Research Institute, Urmia University of Medical Sciences, Shafa St, Ershad Blvd., P.O. Box: 1138, 57147, Urmia, Iran.
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Al Sharif S, Pinto DO, Mensah GA, Dehbandi F, Khatkar P, Kim Y, Branscome H, Kashanchi F. Extracellular Vesicles in HTLV-1 Communication: The Story of an Invisible Messenger. Viruses 2020; 12:E1422. [PMID: 33322043 PMCID: PMC7763366 DOI: 10.3390/v12121422] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 12/07/2020] [Accepted: 12/08/2020] [Indexed: 02/08/2023] Open
Abstract
Human T-cell lymphotropic virus type 1 (HTLV-1) infects 5-10 million people worldwide and is the causative agent of adult T-cell leukemia/lymphoma (ATLL) and HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) as well as other inflammatory diseases. A major concern is that the most majority of individuals with HTLV-1 are asymptomatic carriers and that there is limited global attention by health care officials, setting up potential conditions for increased viral spread. HTLV-1 transmission occurs primarily through sexual intercourse, blood transfusion, intravenous drug usage, and breast feeding. Currently, there is no cure for HTLV-1 infection and only limited treatment options exist, such as class I interferons (IFN) and Zidovudine (AZT), with poor prognosis. Recently, small membrane-bound structures, known as extracellular vesicles (EVs), have received increased attention due to their potential to carry viral cargo (RNA and proteins) in multiple pathogenic infections (i.e., human immunodeficiency virus type I (HIV-1), Zika virus, and HTLV-1). In the case of HTLV-1, EVs isolated from the peripheral blood and cerebral spinal fluid (CSF) of HAM/TSP patients contained the viral transactivator protein Tax. Additionally, EVs derived from HTLV-1-infected cells (HTLV-1 EVs) promote functional effects such as cell aggregation which enhance viral spread. In this review, we present current knowledge surrounding EVs and their potential role as immune-modulating agents in cancer and other infectious diseases such as HTLV-1 and HIV-1. We discuss various features of EVs that make them prime targets for possible vehicles of future diagnostics and therapies.
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Affiliation(s)
| | | | | | | | | | | | | | - Fatah Kashanchi
- Laboratory of Molecular Virology, George Mason University, Manassas, VA 20110, USA; (S.A.S.); (D.O.P.); (G.A.M.); (F.D.); (P.K.); (Y.K.); (H.B.)
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Wang J, Teng Y, Zhao G, Li F, Hou A, Sun B, Kong W, Gao F, Cai L, Jiang C. Exosome-Mediated Delivery of Inducible miR-423-5p Enhances Resistance of MRC-5 Cells to Rabies Virus Infection. Int J Mol Sci 2019; 20:ijms20071537. [PMID: 30934732 PMCID: PMC6479321 DOI: 10.3390/ijms20071537] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 03/22/2019] [Accepted: 03/25/2019] [Indexed: 12/19/2022] Open
Abstract
The human diploid cell line Medical Research Council -5 (MRC-5) is commonly utilized for vaccine development. Although a rabies vaccine developed in cultured MRC-5 cells exists, the poor susceptibility of MRC-5 cells to the rabies virus (RABV) infection limits the potential yield of this vaccine. The underlying mechanism of MRC-5 cell resistance to RABV infection remains unknown. In this study, we demonstrate that viral infection increased exosomal release from MRC-5 cells; conversely, blocking exosome release promoted RABV infection in MRC-5 cells. Additionally, RABV infection up-regulated microRNA (miR)-423-5p expression in exosomes, resulting in feedback inhibition of RABV replication by abrogating the inhibitory effect of suppressor of cytokine signaling 3 (SOCS3) on type I interferon (IFN) signaling. Furthermore, intercellular delivery of miR-423-5p by exosomes inhibited RABV replication in MRC-5 cells. We also show that RABV infection increased IFN-β production in MRC-5 cells and that blocking the type I IFN receptor promoted RABV infection. In conclusion, MRC-5 cells were protected from RABV infection by the intercellular delivery of exosomal miR-423-5p and the up-regulation of IFN-β. These findings reveal novel antiviral mechanisms in MRC-5 cells against RABV infection. miR-423-5p, exosomes, and IFN signaling pathways may therefore be potential targets for improving MRC-5 cell-based rabies vaccine production.
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Affiliation(s)
- Jingyu Wang
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
| | - Yawei Teng
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
| | - Guanshu Zhao
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
| | - Fang Li
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
| | - Ali Hou
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130012, China.
| | - Bo Sun
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130012, China.
| | - Wei Kong
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130012, China.
| | - Feng Gao
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130012, China.
| | - Linjun Cai
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130012, China.
| | - Chunlai Jiang
- National Engineering Laboratory for AIDS Vaccine, School of Life Science, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130012, China.
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Zhou D, Xue J, He S, Du X, Zhou J, Li C, Huang L, Nair V, Yao Y, Cheng Z. Reticuloendotheliosis virus and avian leukosis virus subgroup J synergistically increase the accumulation of exosomal miRNAs. Retrovirology 2018; 15:45. [PMID: 29970099 PMCID: PMC6029113 DOI: 10.1186/s12977-018-0427-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 06/21/2018] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Co-infection with avian leukosis virus subgroup J and reticuloendotheliosis virus induces synergistic pathogenic effects and increases mortality. However, the role of exosomal miRNAs in the molecular mechanism of the synergistic infection of the two viruses remains unknown. RESULTS In this study, exosomal RNAs from CEF cells infected with ALV-J, REV or both at the optimal synergistic infection time were analysed by Illumina RNA deep sequencing. A total of 54 (23 upregulated and 31 downregulated) and 16 (7 upregulated and 9 downregulated) miRNAs were identified by comparing co-infection with two viruses, single-infected ALV-J and REV, respectively. Moreover, five key miRNAs, including miR-184-3p, miR-146a-3p, miR-146a-5p, miR-3538 and miR-155, were validated in both exosomes and CEF cells by qRT-PCR. GO annotation and KEGG pathway analysis of the miRNA target genes showed that the five differentially expressed miRNAs participated in virus-vector interaction, oxidative phosphorylation, energy metabolism and cell growth. CONCLUSIONS We demonstrated that REV and ALV-J synergistically increased the accumulation of exosomal miRNAs, which sheds light on the synergistic molecular mechanism of ALV-J and REV.
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Affiliation(s)
- Defang Zhou
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
| | - Jingwen Xue
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
| | - Shuhai He
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
| | - Xusheng Du
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
| | - Jing Zhou
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
| | - Chengui Li
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
| | - Libo Huang
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
| | - Venugopal Nair
- The Pirbright Institute & UK-China Centre of Excellence on Avian Disease Research, Pirbright, Ash Road, Guildford, Surrey, GU24 0NF UK
| | - Yongxiu Yao
- The Pirbright Institute & UK-China Centre of Excellence on Avian Disease Research, Pirbright, Ash Road, Guildford, Surrey, GU24 0NF UK
| | - Ziqiang Cheng
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, 271018 China
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Barbeau B, Hiscott J, Bazarbachi A, Carvalho E, Jones K, Martin F, Matsuoka M, Murphy EL, Ratner L, Switzer WM, Watanabe T. Conference highlights of the 16th International Conference on Human Retrovirology: HTLV and related retroviruses, 26-30 June 2013, Montreal, Canada. Retrovirology 2014; 11:19. [PMID: 24558960 PMCID: PMC3939404 DOI: 10.1186/1742-4690-11-19] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 02/10/2014] [Indexed: 01/19/2023] Open
Abstract
The 16th International Conference on Human Retrovirology: HTLV and Related Retroviruses was held in Montreal, Québec from June 26th to June 30th, 2013 and was therefore hosted by a Canadian city for the first time. The major topic of the meeting was human T-lymphotropic viruses (HTLVs) and was covered through distinct oral and poster presentation sessions: clinical research, animal models, immunology, molecular and cellular biology, human endogenous and emerging exogenous retroviruses and virology. In this review, highlights of the meeting are provided by different experts for each of these research areas.
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Affiliation(s)
- Benoit Barbeau
- Département des sciences biologiques and BioMed Research Center, Université du Québec à Montréal, Room SB-3335, 2080 St-Urbain, Montréal, Québec, Canada
| | - John Hiscott
- VGTI Florida, Port St., Lucie, FL, USA
- Lady Davis Insitute, Montreal, Canada
| | - Ali Bazarbachi
- Department of Internal Medicine, American University of Beirut, Beirut, Lebanon
| | - Edgar Carvalho
- Immunology Department, Universidade Federal da Bahia (UFBA), Salvador, Bahia, Brazil
| | - Kathryn Jones
- Basic Research Program, Cancer and Inflammation Program, SAIC-Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Fabiola Martin
- Centre for Immunology and Infection, Department of Biology, Hull and York Medical School, University of York, York, UK
| | - Masao Matsuoka
- Laboratory of Virus Control, Institute for Virus Research, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Edward L Murphy
- University of California San Francisco and Blood Systems Research Institute, San Francisco, CA, USA
| | - Lee Ratner
- Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - William M Switzer
- Laboratory Branch, Division of HIV/AIDS Prevention, National Center for HIV, Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Toshiki Watanabe
- Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
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