1
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Martin NA, Gonzalez G, Reynolds LJ, Bennett C, Campbell C, Nolan TM, Byrne A, Fennema S, Holohan N, Kuntamukkula SR, Sarwar N, Sala-Comorera L, Dean J, Urtasun-Elizari JM, Hare D, Liddy E, Joyce E, O'Sullivan JJ, Cuddihy JM, McIntyre AM, Robinson EP, Dahly D, Fletcher NF, Cotter S, Fitzpatrick E, Carr MJ, De Gascun CF, Meijer WG. Adeno-Associated Virus 2 and Human Adenovirus F41 in Wastewater during Outbreak of Severe Acute Hepatitis in Children, Ireland. Emerg Infect Dis 2023; 29:751-760. [PMID: 36957994 PMCID: PMC10045691 DOI: 10.3201/eid2904.221878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023] Open
Abstract
During April-July 2022, outbreaks of severe acute hepatitis of unknown etiology (SAHUE) were reported in 35 countries. Five percent of cases required liver transplantation, and 22 patients died. Viral metagenomic studies of clinical samples from SAHUE cases showed a correlation with human adenovirus F type 41 (HAdV-F41) and adeno-associated virus type 2 (AAV2). To explore the association between those DNA viruses and SAHUE in children in Ireland, we quantified HAdV-F41 and AAV2 in samples collected from a wastewater treatment plant serving 40% of Ireland's population. We noted a high correlation between HAdV-F41 and AAV2 circulation in the community and SAHUE clinical cases. Next-generation sequencing of the adenovirus hexon in wastewater demonstrated HAdV-F41 was the predominant HAdV type circulating. Our environmental analysis showed increased HAdV-F41 and AAV2 prevalence in the community during the SAHUE outbreak. Our findings highlight how wastewater sampling could aid in surveillance for respiratory adenovirus species.
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2
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Purves K, Haverty R, O'Neill T, Folan D, O'Reilly S, Baird AW, Scholz D, Mallon PW, Gautier V, Folan M, Fletcher NF. A novel antiviral formulation containing caprylic acid inhibits SARS-CoV-2 infection of a human bronchial epithelial cell model. J Gen Virol 2023; 104. [PMID: 36787173 DOI: 10.1099/jgv.0.001821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
A novel proprietary formulation, ViruSAL, has previously been demonstrated to inhibit diverse enveloped viral infections in vitro and in vivo. We evaluated the ability of ViruSAL to inhibit SARS-CoV-2 (severe acute respiratory syndrome coronavirus-2) infectivity, using physiologically relevant models of the human bronchial epithelium, to model early infection of the upper respiratory tract. ViruSAL potently inhibited SARS-CoV-2 infection of human bronchial epithelial cells cultured as an air-liquid interface (ALI) model, in a concentration- and time-dependent manner. Viral infection was completely inhibited when ViruSAL was added to bronchial airway models prior to infection. Importantly, ViruSAL also inhibited viral infection when added to ALI models post-infection. No evidence of cellular toxicity was detected in ViruSAL-treated cells at concentrations that completely abrogated viral infectivity. Moreover, intranasal instillation of ViruSAL to a rat model did not result in any toxicity or pathological changes. Together these findings highlight the potential for ViruSAL as a novel and potent antiviral for use within clinical and prophylactic settings.
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Affiliation(s)
- Kevin Purves
- Veterinary Sciences Centre, University College Dublin, Belfield, Dublin, Ireland
| | - Ruth Haverty
- Veterinary Sciences Centre, University College Dublin, Belfield, Dublin, Ireland
| | - Tiina O'Neill
- Conway Institute of Biomedical and Biomolecular Research, University College Dublin, Belfield, Dublin, Ireland
| | - David Folan
- Westgate Biomedical Ltd, Lough Eske, Donegal Town, Co. Donegal, Ireland
| | - Sophie O'Reilly
- Centre for Experimental Pathogen Host Research, University College Dublin, Belfield, Dublin, Ireland
| | - Alan W Baird
- Veterinary Sciences Centre, University College Dublin, Belfield, Dublin, Ireland
- Conway Institute of Biomedical and Biomolecular Research, University College Dublin, Belfield, Dublin, Ireland
| | - Dimitri Scholz
- Conway Institute of Biomedical and Biomolecular Research, University College Dublin, Belfield, Dublin, Ireland
| | - Patrick W Mallon
- Centre for Experimental Pathogen Host Research, University College Dublin, Belfield, Dublin, Ireland
- Department of Infectious Diseases, St Vincent's University Hospital, Dublin, Ireland
| | - Virginie Gautier
- Centre for Experimental Pathogen Host Research, University College Dublin, Belfield, Dublin, Ireland
| | - Michael Folan
- Westgate Biomedical Ltd, Lough Eske, Donegal Town, Co. Donegal, Ireland
| | - Nicola F Fletcher
- Veterinary Sciences Centre, University College Dublin, Belfield, Dublin, Ireland
- Conway Institute of Biomedical and Biomolecular Research, University College Dublin, Belfield, Dublin, Ireland
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3
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Reynolds LJ, Gonzalez G, Sala-Comorera L, Martin NA, Byrne A, Fennema S, Holohan N, Kuntamukkula SR, Sarwar N, Nolan TM, Stephens JH, Whitty M, Bennett C, Luu Q, Morley U, Yandle Z, Dean J, Joyce E, O'Sullivan JJ, Cuddihy JM, McIntyre AM, Robinson EP, Dahly D, Fletcher NF, Carr M, De Gascun C, Meijer WG. SARS-CoV-2 variant trends in Ireland: Wastewater-based epidemiology and clinical surveillance. Sci Total Environ 2022; 838:155828. [PMID: 35588817 PMCID: PMC9110007 DOI: 10.1016/j.scitotenv.2022.155828] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 05/05/2022] [Accepted: 05/06/2022] [Indexed: 05/21/2023]
Abstract
SARS-CoV-2 RNA quantification in wastewater is an important tool for monitoring the prevalence of COVID-19 disease on a community scale which complements case-based surveillance systems. As novel variants of concern (VOCs) emerge there is also a need to identify the primary circulating variants in a community, accomplished to date by sequencing clinical samples. Quantifying variants in wastewater offers a cost-effective means to augment these sequencing efforts. In this study, SARS-CoV-2 N1 RNA concentrations and daily loadings were determined and compared to case-based data collected as part of a national surveillance programme to determine the validity of wastewater surveillance to monitor infection spread in the greater Dublin area. Further, sequencing of clinical samples was conducted to determine the primary SARS-CoV-2 lineages circulating in Dublin. Finally, digital PCR was employed to determine whether SARS-CoV-2 VOCs, Alpha and Delta, were quantifiable from wastewater. No lead or lag time was observed between SARS-CoV-2 wastewater and case-based data and SARS-CoV-2 trends in Dublin wastewater significantly correlated with the notification of confirmed cases through case-based surveillance preceding collection with a 5-day average. This demonstrates that viral RNA in Dublin's wastewater mirrors the spread of infection in the community. Clinical sequence data demonstrated that increased COVID-19 cases during Ireland's third wave coincided with the introduction of the Alpha variant, while the fourth wave coincided with increased prevalence of the Delta variant. Interestingly, the Alpha variant was detected in Dublin wastewater prior to the first genome being sequenced from clinical samples, while the Delta variant was identified at the same time in clinical and wastewater samples. This work demonstrates the validity of wastewater surveillance for monitoring SARS-CoV-2 infections and also highlights its effectiveness in identifying circulating variants which may prove useful when sequencing capacity is limited.
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Affiliation(s)
- Liam J Reynolds
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Gabriel Gonzalez
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland; International Collaboration Unit, Research Center for Zoonosis Control, Hokkaido University, N20 W10 Kita-ku, Sapporo 001-0020, Japan
| | - Laura Sala-Comorera
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Niamh A Martin
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Alannah Byrne
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Sanne Fennema
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Niamh Holohan
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Sailusha Ratnam Kuntamukkula
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Natasha Sarwar
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Tristan M Nolan
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Jayne H Stephens
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Megan Whitty
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland
| | - Charlene Bennett
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland
| | - Quynh Luu
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland
| | - Ursula Morley
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland
| | - Zoe Yandle
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland
| | - Jonathan Dean
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland
| | - Eadaoin Joyce
- Irish Water, Colvill House, 24-26 Talbot Street, Dublin 1, Ireland
| | - John J O'Sullivan
- UCD School of Civil Engineering, UCD Dooge Centre for Water Resources Research and UCD Earth Institute, University College Dublin, Dublin 4, Ireland
| | - John M Cuddihy
- HSE - Health Protection Surveillance Centre, Dublin, Ireland
| | | | - Eve P Robinson
- HSE - Health Protection Surveillance Centre, Dublin, Ireland
| | - Darren Dahly
- Health Research Board Clinical Research Facility, University College Cork, Cork, Ireland
| | - Nicola F Fletcher
- UCD School of Veterinary Medicine and UCD Conway Institute, University College Dublin, Belfield, Dublin, Ireland
| | - Michael Carr
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland; International Collaboration Unit, Research Center for Zoonosis Control, Hokkaido University, N20 W10 Kita-ku, Sapporo 001-0020, Japan
| | - Cillian De Gascun
- National Virus Reference Laboratory (NVRL), School of Medicine, University College Dublin, Belfield, Dublin, Ireland
| | - Wim G Meijer
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Dublin, Ireland.
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4
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Zhou Y, Fletcher NF, Zhang N, Hassan J, Gilchrist MD. Enhancement of Antiviral Effect of Plastic Film against SARS-CoV-2: Combining Nanomaterials and Nanopatterns with Scalability for Mass Manufacturing. Nano Lett 2021; 21:10149-10156. [PMID: 34881894 PMCID: PMC8672428 DOI: 10.1021/acs.nanolett.1c02266] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Direct contact with contaminated surfaces in frequently accessed areas is a confirmed transmission mode of SARS-CoV-2. To address this challenge, we have developed novel plastic films with enhanced effectiveness for deactivating the SARS-CoV-2 by means of nanomaterials combined with nanopatterns. Results prove that these functionalized films are able to deactivate SARS-CoV-2 by up to 2 orders of magnitude within the first hour compared to untreated films, thus reducing the likelihood of transmission. Nanopatterns can enhance the antiviral effectiveness by increasing the contact area between nanoparticles and virus. Significantly, the established process also considers the issue of scalability for mass manufacturing. A low-cost process for nanostructured antiviral films integrating ultrasonic atomization spray coating and thermal nanoimprinting lithography is proposed. A further in-depth investigation should consider the size, spacing, and shape of nanopillars, the type and concentration of nanoparticles, and the scale-up and integration of these processes with manufacturing for optimal antiviral effectiveness.
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Affiliation(s)
- Yuyang Zhou
- Centre
of Micro/Nano Manufacturing Technology (MNMT-Dublin), School of Mechanical
and Materials Engineering, University College
Dublin, Dublin D04 KW52, Ireland
- National
Engineering Laboratory for Modern Silk, College of Textile and Clothing
Engineering, Soochow University, Suzhou 215123, China
| | - Nicola F. Fletcher
- School
of Veterinary Medicine, University College
Dublin, Dublin D04 KW52, Ireland
- Conway
Institute of Biomolecular and Biomedical Science, University College Dublin, Dublin D04 KW52, Ireland
| | - Nan Zhang
- Centre
of Micro/Nano Manufacturing Technology (MNMT-Dublin), School of Mechanical
and Materials Engineering, University College
Dublin, Dublin D04 KW52, Ireland
| | - Jaythoon Hassan
- National
Virus Reference Laboratory, University College
Dublin, Dublin D04 KW52, Ireland
| | - Michael D. Gilchrist
- Centre
of Micro/Nano Manufacturing Technology (MNMT-Dublin), School of Mechanical
and Materials Engineering, University College
Dublin, Dublin D04 KW52, Ireland
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5
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Sala-Comorera L, Reynolds LJ, Martin NA, O'Sullivan JJ, Meijer WG, Fletcher NF. Decay of infectious SARS-CoV-2 and surrogates in aquatic environments. Water Res 2021; 201:117090. [PMID: 34111729 PMCID: PMC8005746 DOI: 10.1016/j.watres.2021.117090] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 05/03/2023]
Abstract
The introduction of SARS-CoV-2 containing human stool and sewage into water bodies may raise public health concerns. However, assessment of public health risks by faecally contaminated water is limited by a lack of knowledge regarding the persistence of infectious SARS-CoV-2 in water. In the present study the decay rates of viable infectious SARS-CoV-2 and SARS-CoV-2 RNA were determined in river and seawater at 4 and 20°C. These decay rates were compared to S. typhimurium bacteriophage MS2 and pepper mild mottle virus (PMMoV). Persistence of viable SARS-CoV-2 was temperature dependent, remaining infectious for significantly longer periods of time in both freshwater and seawater at 4°C than at 20°C. T90 for infectious SARS-CoV-2 in river water was 2.3 days and 3.8 days at 20°C and 4°C, respectively. The T90 values were 1.1 days and 2.2 days in seawater at 20°C and 4°C, respectively. In contrast to the rapid inactivation of infectious SARS-CoV-2 in river and sea water, viral RNA was relatively stable. The RNA decay rates were increased in non-sterilised river and seawater, presumably due to the presence of microbiota. The decay rates of infectious MS2, MS2 RNA and PMMoV RNA differed significantly from the decay rate of SARS-CoV-2 RNA, suggesting that their use as surrogate markers for the persistence of SARS-CoV-2 in the environment is limited.
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Affiliation(s)
- Laura Sala-Comorera
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute and UCD Conway Institute, University College Dublin, Dublin 4, Ireland
| | - Liam J Reynolds
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute and UCD Conway Institute, University College Dublin, Dublin 4, Ireland
| | - Niamh A Martin
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute and UCD Conway Institute, University College Dublin, Dublin 4, Ireland
| | - John J O'Sullivan
- UCD School of Civil Engineering, UCD Dooge Centre for Water Resources Research and UCD Earth Institute, University College Dublin, Dublin 4, Ireland
| | - Wim G Meijer
- UCD School of Biomolecular and Biomedical Science, UCD Earth Institute and UCD Conway Institute, University College Dublin, Dublin 4, Ireland.
| | - Nicola F Fletcher
- UCD School of Veterinary Medicine and UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
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6
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Fletcher NF, Meredith LW, Tidswell EL, Bryden SR, Gonçalves-Carneiro D, Chaudhry Y, Shannon-Lowe C, Folan MA, Lefteri DA, Pingen M, Bailey D, McKimmie CS, Baird AW. A novel antiviral formulation inhibits a range of enveloped viruses. J Gen Virol 2020; 101:1090-1102. [PMID: 32692647 DOI: 10.1099/jgv.0.001472] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Some free fatty acids derived from milk and vegetable oils are known to have potent antiviral and antibacterial properties. However, therapeutic applications of short- to medium-chain fatty acids are limited by physical characteristics such as immiscibility in aqueous solutions. We evaluated a novel proprietary formulation based on an emulsion of short-chain caprylic acid, ViroSAL, for its ability to inhibit a range of viral infections in vitro and in vivo. In vitro, ViroSAL inhibited the enveloped viruses Epstein-Barr, measles, herpes simplex, Zika and orf parapoxvirus, together with Ebola, Lassa, vesicular stomatitis and severe acute respiratory syndrome coronavirus 1 (SARS-CoV-1) pseudoviruses, in a concentration- and time-dependent manner. Evaluation of the components of ViroSAL revealed that caprylic acid was the main antiviral component; however, the ViroSAL formulation significantly inhibited viral entry compared with caprylic acid alone. In vivo, ViroSAL significantly inhibited Zika and Semliki Forest virus replication in mice following the inoculation of these viruses into mosquito bite sites. In agreement with studies investigating other free fatty acids, ViroSAL had no effect on norovirus, a non-enveloped virus, indicating that its mechanism of action may be surfactant disruption of the viral envelope. We have identified a novel antiviral formulation that is of great interest for the prevention and/or treatment of a broad range of enveloped viruses, particularly those of the skin and mucosal surfaces.
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Affiliation(s)
- Nicola F Fletcher
- Institute of Immunity and Infection, The University of Birmingham, Birmingham, B15 2TT, UK
| | - Luke W Meredith
- Veterinary Sciences Centre, University College Dublin, Belfield, Dublin 4, Ireland
| | - Emma L Tidswell
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, CB2 0QQ, UK
| | - Steven R Bryden
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, CB2 0QQ, UK
| | - Daniel Gonçalves-Carneiro
- Present address: Laboratory of Retrovirology, The Rockefeller University, New York, New York, USA.,Virus Host Interaction Team, Leeds Institute of Medical Research, School of Medicine, Faculty of Medicine and Health, University of Leeds, Leeds LS9 7TF, UK
| | - Yasmin Chaudhry
- Veterinary Sciences Centre, University College Dublin, Belfield, Dublin 4, Ireland
| | - Claire Shannon-Lowe
- School of Cancer Sciences, The University of Birmingham, Birmingham, B15 2TT, UK
| | - Michael A Folan
- Westgate Biomedical Ltd, Lough Eske, Donegal Town, Co. Donegal, Ireland.,Institute of Immunity and Infection, The University of Birmingham, Birmingham, B15 2TT, UK
| | - Daniella A Lefteri
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, CB2 0QQ, UK
| | - Marieke Pingen
- Present address: Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, G12 8TA, UK.,Division of Virology, Department of Pathology, University of Cambridge, Cambridge, CB2 0QQ, UK
| | - Dalan Bailey
- The Pirbright Institute, Ash Road, Pirbright, Woking, GU24 0NF, UK.,Virus Host Interaction Team, Leeds Institute of Medical Research, School of Medicine, Faculty of Medicine and Health, University of Leeds, Leeds LS9 7TF, UK
| | - Clive S McKimmie
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, CB2 0QQ, UK
| | - Alan W Baird
- Institute of Immunity and Infection, The University of Birmingham, Birmingham, B15 2TT, UK
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7
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Benedikz EK, Bailey D, Cook CNL, Gonçalves-Carneiro D, Buckner MMC, Blair JMA, Wells TJ, Fletcher NF, Goodall M, Flores-Langarica A, Kingsley RA, Madsen J, Teeling J, Johnston SL, MacLennan CA, Balfe P, Henderson IR, Piddock LJV, Cunningham AF, McKeating JA. Bacterial flagellin promotes viral entry via an NF-kB and Toll Like Receptor 5 dependent pathway. Sci Rep 2019; 9:7903. [PMID: 31133714 PMCID: PMC6536546 DOI: 10.1038/s41598-019-44263-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 05/09/2019] [Indexed: 12/13/2022] Open
Abstract
Viruses and bacteria colonize hosts by invading epithelial barriers. Recent studies have shown that interactions between the microbiota, pathogens and the host can potentiate infection through poorly understood mechanisms. Here, we investigated whether diverse bacterial species could modulate virus internalization into host cells, often a rate-limiting step in establishing infections. Lentiviral pseudoviruses expressing influenza, measles, Ebola, Lassa or vesicular stomatitis virus envelope glycoproteins enabled us to study entry of viruses that exploit diverse internalization pathways. Salmonella Typhimurium, Escherichia coli and Pseudomonas aeruginosa significantly increased viral uptake, even at low bacterial frequencies. This did not require bacterial contact with or invasion of host cells. Studies determined that the bacterial antigen responsible for this pro-viral activity was the Toll-Like Receptor 5 (TLR5) agonist flagellin. Exposure to flagellin increased virus attachment to epithelial cells in a temperature-dependent manner via TLR5-dependent activation of NF-ΚB. Importantly, this phenotype was both long lasting and detectable at low multiplicities of infection. Flagellin is shed from bacteria and our studies uncover a new bystander role for this protein in regulating virus entry. This highlights a new aspect of viral-bacterial interplay with significant implications for our understanding of polymicrobial-associated pathogenesis.
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Affiliation(s)
- Elizabeth K Benedikz
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK.,Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Dalan Bailey
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK.,The Pirbright Institute, Guildford, Surrey, UK
| | - Charlotte N L Cook
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | | | - Michelle M C Buckner
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Jessica M A Blair
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Timothy J Wells
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Nicola F Fletcher
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
| | - Margaret Goodall
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
| | | | | | - Jens Madsen
- Department of Child Health, University of Southampton, Southampton, UK
| | - Jessica Teeling
- Biological Sciences, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | | | - Calman A MacLennan
- Jenner Institute, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Peter Balfe
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
| | - Ian R Henderson
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Laura J V Piddock
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Adam F Cunningham
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK.,Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Jane A McKeating
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK. .,Nuffield Department of Medicine, University of Oxford, Oxford, UK.
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8
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Abstract
Jacob sheep (Ovis aries) are a pedigree breed known for their “polycerate” (multihorned) phenotype. We describe a four-horned Jacob lamb that exhibited progressive congenital hindlimb ataxia and paresis, and was euthanased four weeks post-partum. Necropsy and CT-scan revealed deformity and asymmetry of the occipital condyles, causing narrowing of the foramen magnum and spinal cord compression. Histopathology demonstrated Wallerian degeneration of the cervical spinal cord at the level of the foramen magnum. These findings are consistent with occipital condylar dysplasia. This condition has been infrequently reported in the literature as a suspected heritable disease of polycerate Jacob sheep in the USA, and is assumed to arise during selection for the polycerate trait. This is the first reported case in European-bred Jacob sheep. Occipital condylar dysplasia should be considered as a differential diagnosis in polycerate Jacob lambs showing ataxia. It is important to raise awareness of this disease due to its suspected heritability and link to the popular polycerate trait.
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Affiliation(s)
- Alison M Lee
- School of Veterinary Medicine, Veterinary Science Centre, University College Dublin, Belfield, Dublin 4, Ireland
| | - Nicola F Fletcher
- School of Veterinary Medicine, Veterinary Science Centre, University College Dublin, Belfield, Dublin 4, Ireland
| | - Conor Rowan
- School of Veterinary Medicine, Veterinary Science Centre, University College Dublin, Belfield, Dublin 4, Ireland
| | - And Hanne Jahns
- School of Veterinary Medicine, Veterinary Science Centre, University College Dublin, Belfield, Dublin 4, Ireland
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9
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Fletcher NF, Clark AR, Balfe P, McKeating JA. TNF superfamily members promote hepatitis C virus entry via an NF-κB and myosin light chain kinase dependent pathway. J Gen Virol 2017; 98:405-412. [PMID: 27983476 PMCID: PMC5797950 DOI: 10.1099/jgv.0.000689] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Preventing virally induced liver disease begins with an understanding of the host factors that define susceptibility to infection. Hepatitis C virus (HCV) is a global health issue, with an estimated 170 million infected individuals at risk of developing liver disease including fibrosis and hepatocellular carcinoma. The liver is the major reservoir supporting HCV replication and this hepatocellular tropism is defined by HCV engagement of cellular entry receptors. Hepatocytes are polarized in vivo and this barrier function limits HCV entry. We previously reported that activated macrophages promote HCV entry into polarized hepatocytes via a TNF-α-dependent process; however, the underlying mechanism was not defined. In this study, we show that several TNF superfamily members, including TNF-α, TNF-β, TWEAK and LIGHT, promote HCV entry via NF-κB-mediated activation of myosin light chain kinase (MLCK) and disruption of tight junctions. These observations support a model where HCV hijacks an inflammatory immune response to stimulate infection and uncovers a role for NF-κB-MLCK signalling in maintaining hepatocellular tight junctions.
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Affiliation(s)
- N F Fletcher
- Centre for Human Virology, Institute for Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
| | - A R Clark
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - P Balfe
- Centre for Human Virology, Institute for Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
| | - J A McKeating
- Present address: Nuffield Department of Medicine, University of Oxford, UK.,Centre for Human Virology, Institute for Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
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10
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Tully DC, Hjerrild S, Leutscher PD, Renvillard SG, Ogilvie CB, Bean DJ, Videbech P, Allen TM, McKeating JA, Fletcher NF. Deep sequencing of hepatitis C virus reveals genetic compartmentalization in cerebrospinal fluid from cognitively impaired patients. Liver Int 2016; 36:1418-24. [PMID: 27045383 PMCID: PMC5553127 DOI: 10.1111/liv.13134] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 03/22/2016] [Indexed: 12/14/2022]
Abstract
BACKGROUND & AIMS Hepatitis C virus (HCV) causes neuropsychiatric impairment and fatigue with recent studies suggesting HCV invasion of the central nervous system (CNS). Our previous finding that endothelial cells from the blood-brain barrier support HCV infection warrants further investigation to elucidate whether the CNS can serve as a reservoir for independent HCV evolution. METHODS Cerebrospinal fluid (CSF) and plasma from six HCV-infected patients without liver disease or co-morbidities together with plasma from six healthy subjects were profiled for markers of immune activation and viral quasispecies measured by deep sequencing. Unsupervised data analyses were used to identify any associations between cytokine activation markers and clinical outcomes. RESULTS Four of six HCV-infected patients showed significant evidence of cognitive dysfunction and fatigue. Deep sequencing revealed independent viral evolution within the CNS of two cognitively impaired patients. Principal component analysis of peripheral cytokines demonstrated that individuals without cognitive impairment clustered together while a distinct cytokine pattern emerged with patients exhibiting cognitive dysfunction and fatigue. CONCLUSIONS Deep sequencing demonstrated unique viral variants in the CSF of two cognitively impaired patients consistent with CNS replication or sequestration. Meanwhile, compartmentalization was absent in infected patients with no neurocognitive impairment. Examination of cytokine profiles in HCV-infected patients with cognitive dysfunction revealed elevated peripheral cytokine levels resulting in a distinct cytokine profile that may be related to cognitive impairment or viral penetration into the CNS. Further studies to determine the significance of unique HCV variants within the CNS are warranted.
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Affiliation(s)
| | - Simon Hjerrild
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark,Department of Affective Disorders, Aarhus University Hospital, Aarhus, Denmark
| | - Peter D. Leutscher
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark
| | - Signe G. Renvillard
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark
| | | | - David J. Bean
- Ragon Institute of MGH, MIT and Harvard, Cambridge, MA, USA
| | - Poul Videbech
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark,Department of Affective Disorders, Aarhus University Hospital, Aarhus, Denmark
| | - Todd M. Allen
- Ragon Institute of MGH, MIT and Harvard, Cambridge, MA, USA
| | | | - Nicola F. Fletcher
- Centre for Human Virology, University of Birmingham, Birmingham, UK,Veterinary Sciences Centre, University College Dublin, Dublin 4, Ireland
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11
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Fletcher NF, Humphreys E, Jennings E, Osburn W, Lissauer S, Wilson GK, van IJzendoorn SCD, Baumert TF, Balfe P, Afford S, McKeating JA. Hepatitis C virus infection of cholangiocarcinoma cell lines. J Gen Virol 2015; 96:1380-1388. [PMID: 25701818 PMCID: PMC4635488 DOI: 10.1099/vir.0.000090] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 02/07/2015] [Indexed: 12/15/2022] Open
Abstract
Hepatitis C virus (HCV) infects the liver and hepatocytes are the major cell type supporting viral replication. Hepatocytes and cholangiocytes derive from a common hepatic progenitor cell that proliferates during inflammatory conditions, raising the possibility that cholangiocytes may support HCV replication and contribute to the hepatic reservoir. We screened cholangiocytes along with a panel of cholangiocarcinoma-derived cell lines for their ability to support HCV entry and replication. While primary cholangiocytes were refractory to infection and lacked expression of several entry factors, two cholangiocarcinoma lines, CC-LP-1 and Sk-ChA-1, supported efficient HCV entry; furthermore, Sk-ChA-1 cells supported full virus replication. In vivo cholangiocarcinomas expressed all of the essential HCV entry factors; however, cholangiocytes adjacent to the tumour and in normal tissue showed a similar pattern of receptor expression to ex vivo isolated cholangiocytes, lacking SR-BI expression, explaining their inability to support infection. This study provides the first report that HCV can infect cholangiocarcinoma cells and suggests that these heterogeneous tumours may provide a reservoir for HCV replication in vivo.
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Affiliation(s)
- Nicola F Fletcher
- Centre for Human Virology, Viral Hepatitis Laboratory, University of Birmingham, Birmingham B15 2TT, UK
| | | | - Elliott Jennings
- Centre for Human Virology, Viral Hepatitis Laboratory, University of Birmingham, Birmingham B15 2TT, UK
| | - William Osburn
- Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, MD, USA
| | - Samantha Lissauer
- Centre for Human Virology, Viral Hepatitis Laboratory, University of Birmingham, Birmingham B15 2TT, UK
| | - Garrick K Wilson
- Centre for Human Virology, Viral Hepatitis Laboratory, University of Birmingham, Birmingham B15 2TT, UK
| | - Sven C D van IJzendoorn
- Department of Cell Biology, University Medical Center Groningen, University of Groningen, Groningen 9713AV, The Netherlands
| | - Thomas F Baumert
- Inserm U1110, University of Strasbourg 3 Rue Koeberlé, F-67000 Strasbourg, France
| | - Peter Balfe
- Centre for Human Virology, Viral Hepatitis Laboratory, University of Birmingham, Birmingham B15 2TT, UK
| | - Simon Afford
- Centre for Liver Research, University of Birmingham, Birmingham B15 2TT, UK
| | - Jane A McKeating
- Centre for Liver Research, University of Birmingham, Birmingham B15 2TT, UK.,Centre for Human Virology, Viral Hepatitis Laboratory, University of Birmingham, Birmingham B15 2TT, UK
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12
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Abstract
ABSTRACT: To establish infection and access bodily compartments including the gut, lung, liver and brain, viruses must traverse polarized epithelial and endothelial cell sheets. Many viruses use components of the immune system to successfully infect epithelial cells and gain access to underlying tissue. Recently, several reports have highlighted new and surprising ways by which viruses can hijack the immune system to invade polarized cells. This review will summarize recent advances in our understanding of how viruses interact with the immune system, and with polarized cells, for successful infection. These studies raise important questions about the design and screening of therapeutics and vaccines that activate the immune system, which may need to consider the role of immune cells and the inflammatory microenvironment.
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13
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Fletcher NF, Sutaria R, Jo J, Barnes A, Blahova M, Meredith LW, Cosset FL, Curbishley SM, Adams DH, Bertoletti A, McKeating JA. Activated macrophages promote hepatitis C virus entry in a tumor necrosis factor-dependent manner. Hepatology 2014; 59:1320-30. [PMID: 24259385 PMCID: PMC4255687 DOI: 10.1002/hep.26911] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/19/2013] [Indexed: 02/06/2023]
Abstract
UNLABELLED Macrophages are critical components of the innate immune response in the liver. Chronic hepatitis C is associated with immune infiltration and the infected liver shows a significant increase in total macrophage numbers; however, their role in the viral life cycle is poorly understood. Activation of blood-derived and intrahepatic macrophages with a panel of Toll-like receptor agonists induce soluble mediators that promote hepatitis C virus (HCV) entry into polarized hepatoma cells. We identified tumor necrosis factor α (TNF-α) as the major cytokine involved in this process. Importantly, this effect was not limited to HCV; TNF-α increased the permissivity of hepatoma cells to infection by Lassa, measles and vesicular stomatitis pseudoviruses. TNF-α induced a relocalization of tight junction protein occludin and increased the lateral diffusion speed of HCV receptor tetraspanin CD81 in polarized HepG2 cells, providing a mechanism for their increased permissivity to support HCV entry. High concentrations of HCV particles could stimulate macrophages to express TNF-α, providing a direct mechanism for the virus to promote infection. CONCLUSION This study shows a new role for TNF-α to increase virus entry and highlights the potential for HCV to exploit existing innate immune responses in the liver to promote de novo infection events.
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Affiliation(s)
- Nicola F Fletcher
- Hepatitis C Research Group, Institute for Biomedical Research, University of BirminghamBirmingham, UK
| | - Rupesh Sutaria
- NIHR Liver Biomedical Research Unit, University of BirminghamBirmingham, UK
| | - Juandy Jo
- Viral Hepatitis Laboratory, Singapore Institute for Clinical Sciences, Agency of Science Technology and Research (A*STAR)Singapore
| | - Amy Barnes
- Hepatitis C Research Group, Institute for Biomedical Research, University of BirminghamBirmingham, UK
| | - Miroslava Blahova
- NIHR Liver Biomedical Research Unit, University of BirminghamBirmingham, UK
| | - Luke W Meredith
- Hepatitis C Research Group, Institute for Biomedical Research, University of BirminghamBirmingham, UK
| | | | | | - David H Adams
- NIHR Liver Biomedical Research Unit, University of BirminghamBirmingham, UK
| | - Antonio Bertoletti
- Viral Hepatitis Laboratory, Singapore Institute for Clinical Sciences, Agency of Science Technology and Research (A*STAR)Singapore
| | - Jane A McKeating
- Hepatitis C Research Group, Institute for Biomedical Research, University of BirminghamBirmingham, UK,NIHR Liver Biomedical Research Unit, University of BirminghamBirmingham, UK
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14
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Meredith LW, Harris HJ, Wilson GK, Fletcher NF, Balfe P, McKeating JA. Early infection events highlight the limited transmissibility of hepatitis C virus in vitro. J Hepatol 2013; 58:1074-80. [PMID: 23353869 DOI: 10.1016/j.jhep.2013.01.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 12/10/2012] [Accepted: 01/09/2013] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Hepatitis C virus (HCV) poses a global health problem, with over 170 million chronically infected individuals at risk of developing progressive liver disease. The ability of a virus to spread within a host is a key determinant of its persistence and virulence. HCV can transmit in vitro by cell-free particle diffusion or via contact(s) between infected and naïve hepatocytes. However, limited information is available on the relative efficiency of these routes, our aim is to develop physiologically relevant assays to quantify these processes. METHODS We developed a single-cycle infection assay to measure HCV transmission rates. RESULTS We compared HCV spread in proliferating and arrested cell systems and demonstrated a significant reduction in cell-to-cell infection of arrested target cells. Comparison of cell-free and cell-to-cell virus spread demonstrated relatively poor transmission rates, with 10-50 infected producer cells required to infect a single naïve target cell. We found HCV strain J6/JFH to be 10-fold more efficient at spreading via the cell-to-cell route than cell-free, whereas SA13/JFH and HK6/JFH strains showed comparable rates of infection via both routes. Importantly, the level of infectious virus released from cells did not predict the ability of a virus to spread in vitro, highlighting the importance of studying cell-associated viruses. CONCLUSIONS These studies demonstrate the relatively poor infectivity of HCV and highlight differences between strains in their efficiency and preferred route of transmission that may inform future therapeutic strategies that target virus entry.
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Affiliation(s)
- Luke W Meredith
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, UK
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15
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Fletcher NF, Howard C, McKeating JA. Over the fence or through the gate: how viruses infect polarized cells. Immunotherapy 2012; 4:249-51. [PMID: 22401628 DOI: 10.2217/imt.12.6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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16
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Abstract
Hepatitis C virus (HCV) is an enveloped, positive-strand RNA virus of the family Flaviviridae that primarily infects hepatocytes, causing acute and chronic liver disease. HCV is also associated with a variety of extrahepatic symptoms including central nervous system (CNS) abnormalities, cognitive dysfunction, fatigue and depression. These symptoms do not correlate with the severity of liver disease and are independent of hepatic encephalopathy. HCV RNA has been associated with CNS tissue, and reports of viral sequence diversity between brain and liver tissue suggest independent viral evolution in the CNS and liver. This review will explore the data supporting HCV infection of the CNS and how this fits into our current understanding of HCV pathogenesis.
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Affiliation(s)
- N F Fletcher
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK.
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17
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Abstract
Hepatitis C virus (HCV) is an enveloped, positive-strand RNA virus of the family Flaviviridae that primarily infects hepatocytes, causing acute and chronic liver disease. HCV is also associated with a variety of extrahepatic symptoms including central nervous system (CNS) abnormalities, cognitive dysfunction, fatigue and depression. These symptoms do not correlate with the severity of liver disease and are independent of hepatic encephalopathy. HCV RNA has been associated with CNS tissue, and reports of viral sequence diversity between brain and liver tissue suggest independent viral evolution in the CNS and liver. This review will explore the data supporting HCV infection of the CNS and how this fits into our current understanding of HCV pathogenesis.
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Affiliation(s)
- N F Fletcher
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK.
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18
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Wilson GK, Brimacombe CL, Rowe IA, Reynolds GM, Fletcher NF, Stamataki Z, Bhogal RH, Simões ML, Ashcroft M, Afford SC, Mitry RR, Dhawan A, Mee CJ, Hübscher SG, Balfe P, McKeating JA. A dual role for hypoxia inducible factor-1α in the hepatitis C virus lifecycle and hepatoma migration. J Hepatol 2012; 56:803-9. [PMID: 22178269 PMCID: PMC3343261 DOI: 10.1016/j.jhep.2011.11.018] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Revised: 10/25/2011] [Accepted: 11/14/2011] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Hepatitis C virus (HCV) causes progressive liver disease and is a major risk factor for the development of hepatocellular carcinoma (HCC). However, the role of infection in HCC pathogenesis is poorly understood. We investigated the effect(s) of HCV infection and viral glycoprotein expression on hepatoma biology to gain insights into the development of HCV associated HCC. METHODS We assessed the effect(s) of HCV and viral glycoprotein expression on hepatoma polarity, migration and invasion. RESULTS HCV glycoproteins perturb tight and adherens junction protein expression, and increase hepatoma migration and expression of epithelial to mesenchymal transition markers Snail and Twist via stabilizing hypoxia inducible factor-1α (HIF-1α). HIF-1α regulates many genes involved in tumor growth and metastasis, including vascular endothelial growth factor (VEGF) and transforming growth factor-beta (TGF-β). Neutralization of both growth factors shows different roles for VEGF and TGFβ in regulating hepatoma polarity and migration, respectively. Importantly, we confirmed these observations in virus infected hepatoma and primary human hepatocytes. Inhibition of HIF-1α reversed the effect(s) of infection and glycoprotein expression on hepatoma permeability and migration and significantly reduced HCV replication, demonstrating a dual role for HIF-1α in the cellular processes that are deregulated in many human cancers and in the viral life cycle. CONCLUSIONS These data provide new insights into the cancer-promoting effects of HCV infection on HCC migration and offer new approaches for treatment.
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Key Words
- bc, bile canaliculi
- cmfda, 5-chloromethylfluorescein diacetate
- hcc, hepatocellular carcinoma
- emt, epithelial to mesenchymal transition
- hcvcc, hepatitis c virus cell culture
- hif-1α, hypoxia inducible factor 1 alpha
- jfh-1, japanese fulminant hepatitis-1
- mrp-2, multidrug resistant protein-2
- phh, primary human hepatocytes
- sr-bi, scavenger receptor class b member 1
- tgfβ, transforming growth factor-beta
- tnfα, tumor necrosis factor alpha
- vegf, vascular endothelial growth factor
- vsv-g, vesicular stomatitis virus glycoprotein
- hepatitis c
- hypoxia
- invasion
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Affiliation(s)
- Garrick K. Wilson
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Claire L. Brimacombe
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Ian A. Rowe
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Gary M. Reynolds
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Nicola F. Fletcher
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Zania Stamataki
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Ricky H. Bhogal
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Maria L. Simões
- Division of Medicine, University College London, London, United Kingdom
| | - Margaret Ashcroft
- Division of Medicine, University College London, London, United Kingdom
| | - Simon C. Afford
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Ragai R. Mitry
- Institute of Liver Studies, Kings College Hospital and Kings College London School of Medicine, London, United Kingdom
| | - Anil Dhawan
- Institute of Liver Studies, Kings College Hospital and Kings College London School of Medicine, London, United Kingdom
| | - Christopher J. Mee
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Stefan G. Hübscher
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom,Department of Cellular Pathology, Queen Elizabeth Hospital Birmingham, Birmingham, United Kingdom
| | - Peter Balfe
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Jane A. McKeating
- Institute for Biomedical Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom,Corresponding author. Address: Institute for Biomedical Research, University of Birmingham, Birmingham B15 2TT, United Kingdom. Fax: +44 121 414 3599.
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19
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Meredith LW, Wilson GK, Fletcher NF, McKeating JA. Hepatitis C virus entry: beyond receptors. Rev Med Virol 2012; 22:182-93. [PMID: 22392805 DOI: 10.1002/rmv.723] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 09/30/2011] [Accepted: 10/09/2011] [Indexed: 12/11/2022]
Abstract
HCV is a blood-borne pathogen that affects approximately 3% of the global population and leads to progressive liver disease. Recent advances have identified an essential role for host cell molecules: tetraspanin CD81, scavenger receptor B1 and the tight junction proteins claudin-1 and occludin in HCV entry, suggesting a complex multi-step process. The conserved nature of this receptor-dependent step in the viral life cycle offers an attractive target for therapeutic intervention. Evidence is emerging that additional factors other than classical receptors, such as inflammatory mediators regulate the ability of hepatocytes to support HCV entry, and as such may provide potential avenues for drug design and development. In this review, we summarise the recent literature on HCV entry mechanisms with a view to realising the future potential of therapeutically targeting this process.
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Affiliation(s)
- Luke W Meredith
- Institute for Biomedical Research, University of Birmingham, Birmingham, UK
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20
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Fletcher NF, Wilson GK, Murray J, Hu K, Lewis A, Reynolds GM, Stamataki Z, Meredith LW, Rowe IA, Luo G, Lopez–ramirez MIGUELA, Baumert TF, Weksler B, Couraud PO, Kim KS, Romero IA, Jopling C, Morgello S, Balfe P, Mckeating JA. Hepatitis C virus infects the endothelial cells of the blood-brain barrier. Gastroenterology 2012; 142:634-643.e6. [PMID: 22138189 PMCID: PMC3801216 DOI: 10.1053/j.gastro.2011.11.028] [Citation(s) in RCA: 174] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2011] [Revised: 10/18/2011] [Accepted: 11/15/2011] [Indexed: 12/15/2022]
Abstract
BACKGROUND & AIMS Hepatitis C virus (HCV) infection leads to progressive liver disease and is associated with a variety of extrahepatic syndromes, including central nervous system (CNS) abnormalities. However, it is unclear whether such cognitive abnormalities are a function of systemic disease, impaired hepatic function, or virus infection of the CNS. METHODS We measured levels of HCV RNA and expression of the viral entry receptor in brain tissue samples from 10 infected individuals (and 3 uninfected individuals, as controls) and human brain microvascular endothelial cells by using quantitative polymerase chain reaction and immunochemical and confocal imaging analyses. HCV pseudoparticles and cell culture-derived HCV were used to study the ability of endothelial cells to support viral entry and replication. RESULTS Using quantitative polymerase chain reaction, we detected HCV RNA in brain tissue of infected individuals at significantly lower levels than in liver samples. Brain microvascular endothelia and brain endothelial cells expressed all of the recognized HCV entry receptors. Two independently derived brain endothelial cell lines, hCMEC/D3 and HBMEC, supported HCV entry and replication. These processes were inhibited by antibodies against the entry factors CD81, scavenger receptor BI, and claudin-1; by interferon; and by reagents that inhibit NS3 protease and NS5B polymerase. HCV infection promotes endothelial permeability and cellular apoptosis. CONCLUSIONS Human brain endothelial cells express functional receptors that support HCV entry and replication. Virus infection of the CNS might lead to HCV-associated neuropathologies.
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Affiliation(s)
- Nicola F. Fletcher
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Garrick K. Wilson
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Jacinta Murray
- School of Pharmacy, University of Nottingham, Nottingham, England
| | - Ke Hu
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Andrew Lewis
- School of Pharmacy, University of Nottingham, Nottingham, England
| | - Gary M. Reynolds
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Zania Stamataki
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Luke W. Meredith
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Ian A. Rowe
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Guangxiang Luo
- Department of Microbiology, Immunology and Molecular Genetics, University of Kentucky, Lexington, Kentucky
| | | | - Thomas F. Baumert
- Université de Strasbourg and Pôle Hépato-digestif, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | - Pierre-Olivier Couraud
- Institut Cochin, CNRS UMR 8104, INSERM Unité 567, Université Paris Descartes, Paris, France
| | - Kwang Sik Kim
- Division of Infectious Diseases, The Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Ignacio A. Romero
- Department of Life Sciences, The Open University, Milton Keynes, England
| | | | - Susan Morgello
- Department of Pathology, Mount Sinai School of Medicine, New York, New York
| | - Peter Balfe
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
| | - Jane A. Mckeating
- Hepatitis C Research Group, Institute for Biomedical Research, University of Birmingham, Birmingham, England
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21
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Fletcher NF, Yang JP, Farquhar MJ, Hu K, Davis C, He Q, Dowd K, Ray SC, Krieger SE, Neyts J, Baumert TF, Balfe P, McKeating JA, Wong-Staal F. Hepatitis C virus infection of neuroepithelioma cell lines. Gastroenterology 2010; 139:1365-74. [PMID: 20538002 PMCID: PMC3298458 DOI: 10.1053/j.gastro.2010.06.008] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Revised: 05/19/2010] [Accepted: 06/01/2010] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Hepatitis C virus (HCV) establishes chronic infections in 3% of the world's population. Infection leads to progressive liver disease; hepatocytes are the major site of viral replication in vivo. However, chronic infection is associated with a variety of extrahepatic syndromes, including central nervous system (CNS) abnormalities. We therefore screened a series of neural and brain-derived cell lines for their ability to support HCV entry and replication. METHODS We used a panel of neural-derived cell lines, HCV pseudoparticles (HCVpp), and an infectious, HCV JFH-1 cell-culture system (HCVcc) to assess viral tropism. RESULTS Two independently derived neuroepithelioma cell lines (SK-N-MC and SK-PN-DW) permitted HCVpp entry. In contrast, several neuroblastoma, glioma, and astrocytoma cell lines were refractory to HCVpp infection. HCVcc infected the neuroepithelioma cell lines and established a productive infection. Permissive neuroepithelioma cells expressed CD81, scavenger receptor BI (SR-BI), and the tight junction proteins Claudin-1 (CLDN1) and occludin, whereas nonpermissive neural cell lines lacked CLDN1 and, in some cases, SR-BI. HCVpp infection of the neuroepithelioma cells was neutralized by antibodies to CD81, SR-BI, CLDN1, and HCV E2. Furthermore, anti-CD81, interferon, and the anti-NS3 protease inhibitor VX-950 significantly reduced HCVcc infection of neuroepithelioma and hepatoma cells. CONCLUSIONS Neuroepithelioma-derived cell lines express functional receptors that support HCV entry at levels comparable to those of hepatoma cells. HCV infection in vitro is not restricted to hepatic-derived cells, so HCV might infect cells of the CNS in vivo.
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Affiliation(s)
- Nicola F Fletcher
- Hepatitis C Research Group, Institute For Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK
| | - Jian Ping Yang
- iTherX Pharmaceuticals, Inc., P.O. Box 910530, San Diego, CA 92191-0530, USA
| | - Michelle J Farquhar
- Hepatitis C Research Group, Institute For Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK
| | - Ke Hu
- Hepatitis C Research Group, Institute For Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK
| | - Christopher Davis
- Hepatitis C Research Group, Institute For Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK
| | - Qiuchen He
- iTherX Pharmaceuticals, Inc., P.O. Box 910530, San Diego, CA 92191-0530, USA
| | - Kimberly Dowd
- Johns Hopkins University School of Medicine, Division of Infectious Diseases, Baltimore, MD 21205-1521, USA
| | - Stuart C Ray
- Johns Hopkins University School of Medicine, Division of Infectious Diseases, Baltimore, MD 21205-1521, USA
| | - Sophie E Krieger
- Inserm U748, Université de Strasbourg and Pôle Hépato-digestif, Hôpitaux Universitaires de Strasbourg, F-67000 Strasbourg, France
| | - Johan Neyts
- Rega Institute for Medical Research, University of Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium
| | - Thomas F Baumert
- Inserm U748, Université de Strasbourg and Pôle Hépato-digestif, Hôpitaux Universitaires de Strasbourg, F-67000 Strasbourg, France
| | - Peter Balfe
- Hepatitis C Research Group, Institute For Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK
| | - Jane A McKeating
- Hepatitis C Research Group, Institute For Biomedical Research, University of Birmingham, Birmingham, B15 2TT, UK,Corresponding author Jane A. McKeating, contact information: , Tel: (44) 121 414 8173, fax: (44) 121 414 3599
| | - Flossie Wong-Staal
- iTherX Pharmaceuticals, Inc., P.O. Box 910530, San Diego, CA 92191-0530, USA
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22
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Fletcher NF, Meeker RB, Hudson LC, Callanan JJ. The neuropathogenesis of feline immunodeficiency virus infection: barriers to overcome. Vet J 2010; 188:260-9. [PMID: 20418131 DOI: 10.1016/j.tvjl.2010.03.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2009] [Revised: 03/19/2010] [Accepted: 03/27/2010] [Indexed: 11/27/2022]
Abstract
Feline immunodeficiency virus (FIV), like human immunodeficiency virus (HIV)-1, is a neurotropic lentivirus, and both natural and experimental infections are associated with neuropathology. FIV enters the brain early following experimental infection, most likely via the blood-brain and blood-cerebrospinal fluid barriers. The exact mechanism of entry, and the factors that influence this entry, are not fully understood. As FIV is a recognised model of HIV-1 infection, understanding such mechanisms is important, particularly as HIV enters the brain early in infection. Furthermore, the development of strategies to combat this central nervous system (CNS) infection requires an understanding of the interactions between the virus and the CNS. In this review the results of both in vitro and in vivo FIV studies are assessed in an attempt to elucidate the mechanisms of viral entry into the brain.
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Affiliation(s)
- Nicola F Fletcher
- Veterinary Sciences Centre, School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland
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Fletcher NF, Bexiga MG, Brayden DJ, Brankin B, Willett BJ, Hosie MJ, Jacque JM, Callanan JJ. Lymphocyte migration through the blood-brain barrier (BBB) in feline immunodeficiency virus infection is significantly influenced by the pre-existence of virus and tumour necrosis factor (TNF)-alpha within the central nervous system (CNS): studies using an in vitro feline BBB model. Neuropathol Appl Neurobiol 2009; 35:592-602. [PMID: 19486302 DOI: 10.1111/j.1365-2990.2009.01031.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS In human immunodeficiency virus infection, macrophage-tropic and lymphotropic viruses exist in the host. Central nervous system (CNS) infection is an early and ongoing event, important to understand when developing strategies to treat infection. Some knowledge exists on macrophage-tropic virus interactions with the blood-brain barrier (BBB), and the aim of this study was to investigate lymphotropic lentivirus interactions with the BBB. METHODS Interactions of the lymphotropic feline immunodeficiency virus (FIV) with an in vitro model of the feline BBB were evaluated in scenarios to mimic in vivo infections. RESULTS Cell-free FIV crossed the BBB in very low quantities, and in the presence of tumour necrosis factor (TNF)-alpha, BBB integrity was unaffected. However, cell-associated FIV readily crossed the BBB, but BBB integrity was not significantly altered. Transmigration of uninfected and infected lymphocytes increased in response to TNF-alpha, accompanied by a moderate disruption of barrier integrity and an upregulation of vascular cell adhesion molecule-1 rather than intercellular adhesion molecule-1. Significant enhancement of migration and disruption of BBB tight junctions occurred when infected cells and TNF-alpha were added to the brain side of the BBB and this enhancement was not mediated through additional TNF-alpha production. CONCLUSIONS Small quantities of virus in the brain together with TNF-alpha have the potential to stimulate greater cell and viral entry into the CNS and this is likely to involve important factors other than further TNF-alpha production. Lymphotropic lentivirus entry to the CNS is governed by many factors similar to macrophage-tropic strains.
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Fletcher NF, Brayden DJ, Brankin B, Callanan JJ. Feline immunodeficiency virus infection: a valuable model to study HIV-1 associated encephalitis. Vet Immunol Immunopathol 2008; 123:134-7. [PMID: 18289700 DOI: 10.1016/j.vetimm.2008.01.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Feline immunodeficiency virus (FIV), like human immunodeficiency virus (HIV)-1, is a neurotropic lentivirus and is associated with neuropathology in natural and experimental infections. FIV enters the brain early following experimental infection, and virus has been proposed to enter the brain via the blood-brain barrier and blood-CSF barrier, within infected lymphocytes and monocytes/macrophages. However the entry of cell-free virus or the direct infection of brain endothelial cells and astrocytes of the blood-brain barrier may also contribute to CNS infection. This review explores the role played by the FIV model in the elucidation of mechanism of lentiviral entry to the brain and viral interactions with the CNS, particularly in relation to lymphotropic lentiviruses.
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Affiliation(s)
- Nicola F Fletcher
- School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland.
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Fletcher NF, Brayden DJ, Brankin B, Worrall S, Callanan JJ. Growth and characterisation of a cell culture model of the feline blood–brain barrier. Vet Immunol Immunopathol 2006; 109:233-44. [PMID: 16182376 DOI: 10.1016/j.vetimm.2005.08.025] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2005] [Revised: 07/15/2005] [Accepted: 08/15/2005] [Indexed: 01/30/2023]
Abstract
An in vitro model of the feline blood-brain barrier was developed using primary cultures of brain capillary endothelial cells derived from adult cats. They were grown in the presence of astrocytes obtained from newborn kittens. Feline endothelial cell cultures were characterised by uptake of DiI-acetylated low-density lipoprotein (DiI-Ac-LDL) and expression of von Willebrand factor. Astrocytes were characterised based on their expression of glial fibrillary acidic protein (GFAP). Electron microscopy revealed junctional specialisation between endothelial cells. Occludin and ZO-1 expression by the endothelial cell cultures was detected by Western blot analysis. Barrier function of co-cultured endothelial cells and astrocytes was confirmed by a transendothelial electrical resistance (TEER) value of 30-35 Omegacm2 and apparent permeability coefficients (Papp) for FD-40 (FITC-dextran, 40 kDa) of 4x10(-6) cm/s and for FD-4 (4kDa) of 1.92x10(-5) cm/s. In endothelial cell monolayers grown with astrocyte-conditioned medium, the TEER value was lower (20-25 Omegacm2), and Papp of FD-40 and FD-4 was higher at 6.27x10(-6) and 3.96x10(-5) cm/s, respectively. This model should have useful applications in the examination of events occurring at the BBB early in FIV infection, and may provide knowledge applicable to HIV infection.
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Affiliation(s)
- Nicola F Fletcher
- Department of Veterinary Pathology, University College Dublin, Belfield, Dublin 4, Ireland.
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