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Antony F, Kinha D, Nowińska A, Rouse BT, Suryawanshi A. The immunobiology of corneal HSV-1 infection and herpetic stromal keratitis. Clin Microbiol Rev 2024; 37:e0000624. [PMID: 39078136 PMCID: PMC11391706 DOI: 10.1128/cmr.00006-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/31/2024] Open
Abstract
SUMMARYHuman alphaherpesvirus 1 (HSV-1) is a highly successful neurotropic pathogen that primarily infects the epithelial cells lining the orofacial mucosa. After primary lytic replication in the oral, ocular, and nasal mucosal epithelial cells, HSV-1 establishes life-long latency in neurons within the trigeminal ganglion. Patients with compromised immune systems experience frequent reactivation of HSV-1 from latency, leading to virus entry in the sensory neurons, followed by anterograde transport and lytic replication at the innervated mucosal epithelial surface. Although recurrent infection of the corneal mucosal surface is rare, it can result in a chronic immuno-inflammatory condition called herpetic stromal keratitis (HSK). HSK leads to gradual vision loss and can cause permanent blindness in severe untreated cases. Currently, there is no cure or successful vaccine to prevent latent or recurrent HSV-1 infections, posing a significant clinical challenge to managing HSK and preventing vision loss. The conventional clinical management of HSK primarily relies on anti-virals to suppress HSV-1 replication, anti-inflammatory drugs (such as corticosteroids) to provide symptomatic relief from pain and inflammation, and surgical interventions in more severe cases to replace damaged cornea. However, each clinical treatment strategy has limitations, such as local and systemic drug toxicities and the emergence of anti-viral-resistant HSV-1 strains. In this review, we summarize the factors and immune cells involved in HSK pathogenesis and highlight alternate therapeutic strategies for successful clinical management of HSK. We also discuss the therapeutic potential of immunoregulatory cytokines and immunometabolism modulators as promising HSK therapies against emerging anti-viral-resistant HSV-1 strains.
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Affiliation(s)
- Ferrin Antony
- Department of Molecular and Cell Biology, University of California, Berkeley, California, USA
| | - Divya Kinha
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | - Anna Nowińska
- Clinical Department of Ophthalmology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia in Katowice, Katowice, Poland
- Ophthalmology Department, Railway Hospital in Katowice, Katowice, Poland
| | - Barry T Rouse
- College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee, USA
| | - Amol Suryawanshi
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
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Hussain MT, Stanfield BA, Bernstein DI. Small Animal Models to Study Herpes Simplex Virus Infections. Viruses 2024; 16:1037. [PMID: 39066200 PMCID: PMC11281376 DOI: 10.3390/v16071037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Revised: 06/14/2024] [Accepted: 06/22/2024] [Indexed: 07/28/2024] Open
Abstract
Herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2) are two of the most prevalent human viruses worldwide. They are known to cause a variety of diseases including genital herpes, meningitis, encephalitis, cold sores and herpes stromal keratitis. The seropositive rate for HSV-1 is around 90%, whereas for HSV-2 it remains around 20-25% for the general adult population. The infections caused by these viruses remain difficult to study because a large proportion of infected individuals are asymptomatic. Furthermore, given the neurotropic characteristics of the virus, studies aimed at understanding the complex pathogenesis in humans is difficult. As a result, animal models have been developed to understand several characteristics of HSV biology, pathogenesis, disease and host responses to infection. These models are also commonly used as the first evaluation of new drugs and vaccines. There are several well-established animal models to study infection with HSV, including mice, guinea pigs and rabbits. Variables within the animal models depend on the species of animal, route of infection, viral strain, dosage, etc. This review aims at summarizing the most commonly used animal models to study HSV pathogenesis and therapies.
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Affiliation(s)
- Mohammed Tanveer Hussain
- Division of Biotechnology and Molecular Medicine and Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Brent A. Stanfield
- Division of Biotechnology and Molecular Medicine and Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - David I. Bernstein
- Cincinnati Children’s Hospital Medical Center, University of Cincinnati, Cincinnati, OH 45229, USA
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Canova PN, Charron AJ, Leib DA. Models of Herpes Simplex Virus Latency. Viruses 2024; 16:747. [PMID: 38793628 PMCID: PMC11125678 DOI: 10.3390/v16050747] [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: 04/05/2024] [Revised: 04/29/2024] [Accepted: 05/03/2024] [Indexed: 05/26/2024] Open
Abstract
Our current understanding of HSV latency is based on a variety of clinical observations, and in vivo, ex vivo, and in vitro model systems, each with unique advantages and drawbacks. The criteria for authentically modeling HSV latency include the ability to easily manipulate host genetics and biological pathways, as well as mimicking the immune response and viral pathogenesis in human infections. Although realistically modeling HSV latency is necessary when choosing a model, the cost, time requirement, ethical constraints, and reagent availability are also equally important. Presently, there remains a pressing need for in vivo models that more closely recapitulate human HSV infection. While the current in vivo, ex vivo, and in vitro models used to study HSV latency have limitations, they provide further insights that add to our understanding of latency. In vivo models have shed light on natural infection routes and the interplay between the host immune response and the virus during latency, while in vitro models have been invaluable in elucidating molecular pathways involved in latency. Below, we review the relative advantages and disadvantages of current HSV models and highlight insights gained through each.
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Affiliation(s)
- Paige N. Canova
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA;
- Guarini School of Graduate and Advanced Studies at Dartmouth, Hanover, NH 03755, USA;
| | - Audra J. Charron
- Guarini School of Graduate and Advanced Studies at Dartmouth, Hanover, NH 03755, USA;
| | - David A. Leib
- Guarini School of Graduate and Advanced Studies at Dartmouth, Hanover, NH 03755, USA;
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4
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Yin XT, Hartman A, Sirajuddin N, Shukla D, Leger AS, Keadle TL, Stuart PM. UVB induced reactivation leads to HSV1 in the corneas of virtually all latently infected mice and requires STING to develop corneal disease. Sci Rep 2024; 14:6859. [PMID: 38514671 PMCID: PMC10957950 DOI: 10.1038/s41598-024-52597-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 01/21/2024] [Indexed: 03/23/2024] Open
Abstract
Reactivation of latent herpes simplex type 1 results in virus returning to the cornea leading to recurrent herpetic stromal keratitis (rHSK). We compare two competing models to reactivate viruses from latency, UV-B irradiation and cyclophosphamide (CP). Results revealed that while both result in corneal recrudescence, only UV-B irradiation results in rHSK. To better understand the dynamics of reactivation, we analyzed corneas for both the presence of infectious viruses and the dynamics of exposure to multiple reactivations using UV-B. We noted that multiple reactivations result in progressively worse corneal disease. We also noted that expression of IFNα and STING, surragate markers for the presence of virus, are induced by the presence of reactivated virus. Studies to determine the importance of STING to the development of HSK revealed that in the absence of STING, mice do not develop significant HSK and the magnitude of the infiltrate of CD45+ cells in these corneas is significantly reduced. The resulting paucity of CD45+CD11b+GR-1+F4/80-neutrophils, and to a lesser extent CD45+CD11b+GR-1-F4/80+ macrophages in B6-STING KO mice following reactivation is likely the underlying cause for lack of rHSK as has been noted by ourselves and others. These results underscore the critical importance of STING's role in developing rHSK.
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Affiliation(s)
- Xiao-Tang Yin
- Department of Ophthalmology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Alexis Hartman
- Department of Ophthalmology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Nadia Sirajuddin
- Department of Ophthalmology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Deepak Shukla
- Department of Ophthalmology & Visual Sciences, University of Illinois at Chicago, Chicago, IL, USA
- Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL, USA
| | - Anthony St Leger
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Tammie L Keadle
- Department of Biology, Washington University, St. Louis, MO, USA
| | - Patrick M Stuart
- Department of Ophthalmology, Saint Louis University School of Medicine, St. Louis, MO, USA.
- Washington University, 7569 Amherst Avenue, University City, MO, 63130-2805, USA.
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5
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Jaggi U, Matundan HH, Oh JJ, Ghiasi H. Absence of CD80 reduces HSV-1 replication in the eye and delays reactivation but not latency levels. J Virol 2024; 98:e0201023. [PMID: 38376148 PMCID: PMC10949485 DOI: 10.1128/jvi.02010-23] [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: 12/20/2023] [Accepted: 02/07/2024] [Indexed: 02/21/2024] Open
Abstract
Herpes simplex virus-1 (HSV-1) infections are among the most frequent serious viral eye infections in the U.S. and are a major cause of viral-induced blindness. HSV-1 infection is known to induce T cell activation, proliferation, and differentiation that play crucial roles in the development of virus-induced inflammatory lesions, leading to eye disease and causing chronic corneal damage. CD80 is a co-stimulatory molecule and plays a leading role in T cell differentiation. Previous efforts to limit lesion severity by controlling inflammation at the cellular level led us to ask whether mice knocked out for CD80 would show attenuated virus replication following reactivation. By evaluating the effects of CD80 activity on primary and latent infection, we found that in the absence of CD80, virus replication in the eyes and virus reactivation in latent trigeminal ganglia were both significantly reduced. However, latency in latently infected CD80-/- mice did not differ significantly from that in wild-type (WT) control mice. Reduced virus replication in the eyes of CD80-/- mice correlated with significantly expanded CD11c gene expression as compared to WT mice. Taken together, our results indicate that suppression of CD80 could offer significant beneficial therapeutic effects in the treatment of Herpes Stromal Keratitis (HSK).IMPORTANCEOf the many problems associated with recurrent ocular infection, reducing virus reactivation should be a major goal of controlling ocular herpes simplex virus-1 (HSV-1) infection. In this study, we have shown that the absence of CD80 reduces HSV-1 reactivation, which marks the establishment of a previously undescribed mechanism underlying viral immune evasion that could be exploited to better manage HSV infection.
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Affiliation(s)
- Ujjaldeep Jaggi
- Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Burns and Allen Research Institute, Los Angeles, California, USA
| | - Harry H. Matundan
- Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Burns and Allen Research Institute, Los Angeles, California, USA
| | - Jay J. Oh
- Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Burns and Allen Research Institute, Los Angeles, California, USA
| | - Homayon Ghiasi
- Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Burns and Allen Research Institute, Los Angeles, California, USA
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Loiseau A, Raîche-Marcoux G, Maranda C, Bertrand N, Boisselier E. Animal Models in Eye Research: Focus on Corneal Pathologies. Int J Mol Sci 2023; 24:16661. [PMID: 38068983 PMCID: PMC10706114 DOI: 10.3390/ijms242316661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 09/27/2023] [Accepted: 11/19/2023] [Indexed: 12/18/2023] Open
Abstract
The eye is a complex sensory organ that enables visual perception of the world. The dysfunction of any of these tissues can impair vision. Conduction studies on laboratory animals are essential to ensure the safety of therapeutic products directly applied or injected into the eye to treat ocular diseases before eventually proceeding to clinical trials. Among these tissues, the cornea has unique homeostatic and regenerative mechanisms for maintaining transparency and refraction of external light, which are essential for vision. However, being the outermost tissue of the eye and directly exposed to the external environment, the cornea is particularly susceptible to injury and diseases. This review highlights the evidence for selecting appropriate animals to better understand and treat corneal diseases, which rank as the fifth leading cause of blindness worldwide. The development of reliable and human-relevant animal models is, therefore, a valuable research tool for understanding and translating fundamental mechanistic findings, as well as for assessing therapeutic potential in humans. First, this review emphasizes the unique characteristics of animal models used in ocular research. Subsequently, it discusses current animal models associated with human corneal pathologies, their utility in understanding ocular disease mechanisms, and their role as translational models for patients.
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Affiliation(s)
- Alexis Loiseau
- Faculty of Medicine, Department of Ophthalmology and Otolaryngology—Head and Neck Surgery, CHU de Québec Research Center, Université Laval, Québec, QC G1S 4L8, Canada; (G.R.-M.); (C.M.)
| | - Gabrielle Raîche-Marcoux
- Faculty of Medicine, Department of Ophthalmology and Otolaryngology—Head and Neck Surgery, CHU de Québec Research Center, Université Laval, Québec, QC G1S 4L8, Canada; (G.R.-M.); (C.M.)
| | - Cloé Maranda
- Faculty of Medicine, Department of Ophthalmology and Otolaryngology—Head and Neck Surgery, CHU de Québec Research Center, Université Laval, Québec, QC G1S 4L8, Canada; (G.R.-M.); (C.M.)
| | - Nicolas Bertrand
- Faculty of Pharmacy, CHU de Quebec Research Center, Université Laval, Québec, QC G1V 4G2, Canada;
| | - Elodie Boisselier
- Faculty of Medicine, Department of Ophthalmology and Otolaryngology—Head and Neck Surgery, CHU de Québec Research Center, Université Laval, Québec, QC G1S 4L8, Canada; (G.R.-M.); (C.M.)
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Yadavalli T, Patil C, Sharma P, Volety I, Borase H, Kapoor D, Shukla D. Unique Attributes of Guinea Pigs as New Models to Study Ocular Herpes Pathophysiology and Recurrence. Invest Ophthalmol Vis Sci 2023; 64:41. [PMID: 38015175 PMCID: PMC10691389 DOI: 10.1167/iovs.64.14.41] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 10/27/2023] [Indexed: 11/29/2023] Open
Abstract
Purpose The objective of this study was to explore the ocular and systemic outcomes of herpes simplex virus type 1 (HSV-1) infection in guinea pigs, to monitor the spontaneous reactivation of the virus, and to assess the effectiveness of various treatments, drawing comparisons to conventional rabbit models. Methods Guinea pigs and rabbits were infected in the right corneas with differing doses and strains of HSV-1. Observations were made over a 71-day period, focusing on comparing ocular lesions, viral shedding patterns, and weight loss between the two animal models. Postinfection, the effectiveness of trifluridine ophthalmic drops, oral acyclovir, and valacyclovir was evaluated. The confirmation of viral infection was done through virus titer assay, fluorescein staining, and corneal imaging. Results Guinea pigs and rabbits manifested symptoms akin to human herpes stromal keratitis (HSK) when exposed to varying titers of viral suspension. Regardless of the initial viral load, all guinea pig groups demonstrated comparable ocular pathology, witnessing conditions like blepharitis and conjunctivitis within 3 days, progressing to severe conditions, including total corneal opacification and necrotizing keratitis. Tear film collection revealed nonsignificant differences in viral plaques between all groups. Notably, guinea pigs in the low-infection group experienced the most weight loss, although without significant differences. The replication of the same experiment on rabbits yielded consistent results in disease pathology across different groups, with occurrences of blepharitis and conjunctivitis. Interestingly, after initial resolution, guinea pigs presented a more frequent and broadly observed increase in disease score and corneal opacity, a phenomenon rarely seen in rabbits within the same timeframe. The effectiveness of 1% trifluridine was observed in mitigating ocular HSV-1 disease in both species, whereas oral acyclovir and valacyclovir were found to be detrimental and ineffective in guinea pigs but not in rabbits. Conclusions This study demonstrates the potential suitability of guinea pigs as new models for ocular HSV-1 investigations, filling a critical preclinical void of models capable of showcasing spontaneous HSV reactivation in the eye. The observed similarities and differences in the reactions of guinea pigs and rabbits to HSV-1 infection and treatments provide crucial insights, laying the foundation for future studies on ocular HSV pathogenesis, latency, and improved treatment options.
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Affiliation(s)
- Tejabhiram Yadavalli
- Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois, United States
| | - Chandrashekhar Patil
- Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois, United States
| | - Pankaj Sharma
- Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois, United States
| | - Ipsita Volety
- Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois, United States
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, United States
| | - Hemant Borase
- Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois, United States
| | - Divya Kapoor
- Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois, United States
- Department of Microbiology and Immunology, University of Illinois Chicago, Chicago, Illinois, United States
| | - Deepak Shukla
- Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois, United States
- Department of Microbiology and Immunology, University of Illinois Chicago, Chicago, Illinois, United States
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8
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Mody PH, Marvin KN, Hynds DL, Hanson LK. Cytomegalovirus infection induces Alzheimer's disease-associated alterations in tau. J Neurovirol 2023; 29:400-415. [PMID: 37436577 DOI: 10.1007/s13365-022-01109-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 11/21/2022] [Accepted: 12/01/2022] [Indexed: 07/13/2023]
Abstract
Alzheimer's disease (AD) manifests with loss of neurons correlated with intercellular deposition of amyloid (amyloid plaques) and intracellular neurofibrillary tangles of hyperphosphorylated tau. However, targeting AD hallmarks has not as yet led to development of an effective treatment despite numerous clinical trials. A better understanding of the early stages of neurodegeneration may lead to development of more effective treatments. One underexplored area is the clinical correlation between infection with herpesviruses and increased risk of AD. We hypothesized that similar to work performed with herpes simplex virus 1 (HSV1), infection with the cytomegalovirus (CMV) herpesvirus increases levels and phosphorylation of tau, similar to AD tauopathy. We used murine CMV (MCMV) to infect mouse fibroblasts and rat neuronal cells to test our hypothesis. MCMV infection increased steady-state levels of primarily high molecular weight forms of tau and altered the patterns of tau phosphorylation. Both changes required viral late gene products. Glycogen synthase kinase 3 beta (GSK3β) was upregulated in the HSVI model, but inhibition with lithium chloride suggested that this enzyme is unlikely to be involved in MCMV infection mediated tau phosphorylation. Thus, we confirm that MCMV, a beta herpes virus, like alpha herpes viruses (e.g., HSV1), can promote tau pathology. This suggests that CMV infection can be useful as another model system to study mechanisms leading to neurodegeneration. Since MCMV infects both mice and rats as permissive hosts, our findings from tissue culture can likely be applied to a variety of AD models to study development of abnormal tau pathology.
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Affiliation(s)
- Prapti H Mody
- Division of Biology, Texas Woman's University, 304 Administration Drive, Denton, TX, 76204, USA
- Current affiliation: University of Texas Southwestern Medical Center, Dallas, USA
| | - Kelsey N Marvin
- Division of Biology, Texas Woman's University, 304 Administration Drive, Denton, TX, 76204, USA
| | - DiAnna L Hynds
- Division of Biology, Texas Woman's University, 304 Administration Drive, Denton, TX, 76204, USA
| | - Laura K Hanson
- Division of Biology, Texas Woman's University, 304 Administration Drive, Denton, TX, 76204, USA.
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9
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Kutle I, Dittrich A, Wirth D. Mouse Models for Human Herpesviruses. Pathogens 2023; 12:953. [PMID: 37513800 PMCID: PMC10384569 DOI: 10.3390/pathogens12070953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/13/2023] [Accepted: 07/15/2023] [Indexed: 07/30/2023] Open
Abstract
More than one hundred herpesviruses have been isolated from different species so far, with nine infecting humans. Infections with herpesviruses are characterized by life-long latency and represent a significant challenge for human health. To investigate the consequences of infections and identify novel treatment options, in vivo models are of particular relevance. The mouse has emerged as an economical small animal model to investigate herpesvirus infections. However, except for herpes simplex viruses (HSV-1, HSV-2), human herpesviruses cannot infect mice. Three natural herpesviruses have been identified in mice: mouse-derived cytomegalovirus (MCMV), mouse herpesvirus 68 (MHV-68), and mouse roseolovirus (MRV). These orthologues are broadly used to investigate herpesvirus infections within the natural host. In the last few decades, immunocompromised mouse models have been developed, allowing the functional engraftment of various human cells and tissues. These xenograft mice represent valuable model systems to investigate human-restricted viruses, making them particularly relevant for herpesvirus research. In this review, we describe the various mouse models used to study human herpesviruses, thereby highlighting their potential and limitations. Emphasis is laid on xenograft mouse models, covering the development and refinement of immune-compromised mice and their application in herpesvirus research.
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Affiliation(s)
- Ivana Kutle
- Research Group Model Systems for Infection, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
- Institute of Experimental Hematology, Hannover Medical School, 30625 Hannover, Germany
| | - Anne Dittrich
- Research Group Model Systems for Infection, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
- InSCREENeX GmbH, Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Dagmar Wirth
- Research Group Model Systems for Infection, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
- Institute of Experimental Hematology, Hannover Medical School, 30625 Hannover, Germany
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10
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Piras F, Plitnick LM, Berglund P, Bernard MC, Desert P. Nonclinical safety evaluation of two vaccine candidates for herpes simplex virus type 2 to support combined administration in humans. J Appl Toxicol 2023; 43:534-556. [PMID: 36227735 DOI: 10.1002/jat.4404] [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: 06/29/2022] [Revised: 10/07/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022]
Abstract
Herpes simplex virus type 2 (HSV-2) is the most common cause of genital disease worldwide. The development of an effective HSV-2 vaccine would significantly impact global health based on the psychological distress caused by genital herpes for some individuals, the risk transmitting the infection from mother to infant, and the elevated risk of acquiring HIV-1. Five nonclinical safety studies were conducted with the replication defective HSV529 vaccine, alone or adjuvanted with GLA-SE, and the G103 subunit vaccine containing GLA-SE. A biodistribution study was conducted in guinea pigs to evaluate distribution, persistence, and shedding of HSV529. A preliminary immunogenicity study was conducted in rabbits to demonstrate HSV529-specific humoral response and its enhancement by GLA-SE. Three repeated-dose toxicity studies, one in guinea pigs and two in rabbits, were conducted to assess systemic toxicity and local tolerance of HSV529, alone or adjuvanted with GLA-SE, or G103 containing GLA-SE. Data from these studies show that both vaccines are safe and well tolerated and support the ongoing HSV-2 clinical trial in which the two vaccine candidates will be given either sequentially or concomitantly to explore their potential synergistic and incremental effects.
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Affiliation(s)
| | | | - Peter Berglund
- Immune Design Corp., Seattle, WA, USA, a wholly owned subsidiary of Merck & Co., Inc., Rahway, New Jersey, USA
- HDT Bio, Seattle, Washington, USA
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11
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Ren J, Antony F, Rouse BT, Suryawanshi A. Role of Innate Interferon Responses at the Ocular Surface in Herpes Simplex Virus-1-Induced Herpetic Stromal Keratitis. Pathogens 2023; 12:437. [PMID: 36986359 PMCID: PMC10058014 DOI: 10.3390/pathogens12030437] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/06/2023] [Accepted: 03/08/2023] [Indexed: 03/14/2023] Open
Abstract
Herpes simplex virus type 1 (HSV-1) is a highly successful pathogen that primarily infects epithelial cells of the orofacial mucosa. After initial lytic replication, HSV-1 enters sensory neurons and undergoes lifelong latency in the trigeminal ganglion (TG). Reactivation from latency occurs throughout the host's life and is more common in people with a compromised immune system. HSV-1 causes various diseases depending on the site of lytic HSV-1 replication. These include herpes labialis, herpetic stromal keratitis (HSK), meningitis, and herpes simplex encephalitis (HSE). HSK is an immunopathological condition and is usually the consequence of HSV-1 reactivation, anterograde transport to the corneal surface, lytic replication in the epithelial cells, and activation of the host's innate and adaptive immune responses in the cornea. HSV-1 is recognized by cell surface, endosomal, and cytoplasmic pattern recognition receptors (PRRs) and activates innate immune responses that include interferons (IFNs), chemokine and cytokine production, as well as the recruitment of inflammatory cells to the site of replication. In the cornea, HSV-1 replication promotes type I (IFN-α/β) and type III (IFN-λ) IFN production. This review summarizes our current understanding of HSV-1 recognition by PRRs and innate IFN-mediated antiviral immunity during HSV-1 infection of the cornea. We also discuss the immunopathogenesis of HSK, current HSK therapeutics and challenges, proposed experimental approaches, and benefits of promoting local IFN-λ responses.
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Affiliation(s)
- Jiayi Ren
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, 240B Greene Hall, Auburn, AL 36849, USA
| | - Ferrin Antony
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, 240B Greene Hall, Auburn, AL 36849, USA
| | - Barry T. Rouse
- College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37996, USA
| | - Amol Suryawanshi
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, 240B Greene Hall, Auburn, AL 36849, USA
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12
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Sutter J, Bruggeman PJ, Wigdahl B, Krebs FC, Miller V. Manipulation of Oxidative Stress Responses by Non-Thermal Plasma to Treat Herpes Simplex Virus Type 1 Infection and Disease. Int J Mol Sci 2023; 24:4673. [PMID: 36902102 PMCID: PMC10003306 DOI: 10.3390/ijms24054673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/16/2023] [Accepted: 02/24/2023] [Indexed: 03/04/2023] Open
Abstract
Herpes simplex virus type 1 (HSV-1) is a contagious pathogen with a large global footprint, due to its ability to cause lifelong infection in patients. Current antiviral therapies are effective in limiting viral replication in the epithelial cells to alleviate clinical symptoms, but ineffective in eliminating latent viral reservoirs in neurons. Much of HSV-1 pathogenesis is dependent on its ability to manipulate oxidative stress responses to craft a cellular environment that favors HSV-1 replication. However, to maintain redox homeostasis and to promote antiviral immune responses, the infected cell can upregulate reactive oxygen and nitrogen species (RONS) while having a tight control on antioxidant concentrations to prevent cellular damage. Non-thermal plasma (NTP), which we propose as a potential therapy alternative directed against HSV-1 infection, is a means to deliver RONS that affect redox homeostasis in the infected cell. This review emphasizes how NTP can be an effective therapy for HSV-1 infections through the direct antiviral activity of RONS and via immunomodulatory changes in the infected cells that will stimulate anti-HSV-1 adaptive immune responses. Overall, NTP application can control HSV-1 replication and address the challenges of latency by decreasing the size of the viral reservoir in the nervous system.
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Affiliation(s)
- Julia Sutter
- Center for Molecular Virology and Gene Therapy, Institute for Molecular Medicine and Infectious Disease, Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Peter J. Bruggeman
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
| | - Brian Wigdahl
- Center for Molecular Virology and Gene Therapy, Institute for Molecular Medicine and Infectious Disease, Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Fred C. Krebs
- Center for Molecular Virology and Gene Therapy, Institute for Molecular Medicine and Infectious Disease, Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Vandana Miller
- Center for Molecular Virology and Gene Therapy, Institute for Molecular Medicine and Infectious Disease, Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA
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13
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A Guide to Preclinical Models of Zoster-Associated Pain and Postherpetic Neuralgia. Curr Top Microbiol Immunol 2022; 438:189-221. [PMID: 34524508 DOI: 10.1007/82_2021_240] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Reactivation of latent varicella-zoster virus (VZV) causes herpes zoster (HZ), which is commonly accompanied by acute pain and pruritus over the time course of a zosteriform rash. Although the rash and associated pain are self-limiting, a considerable fraction of HZ cases will subsequently develop debilitating chronic pain states termed postherpetic neuralgia (PHN). How VZV causes acute pain and the mechanisms underlying the transition to PHN are far from clear. The human-specific nature of VZV has made in vivo modeling of pain following reactivation difficult to study because no single animal can reproduce reactivated VZV disease as observed in the clinic. Investigations of VZV pathogenesis following primary infection have benefited greatly from human tissues harbored in immune-deficient mice, but modeling of acute and chronic pain requires an intact nervous system with the capability of transmitting ascending and descending sensory signals. Several groups have found that subcutaneous VZV inoculation of the rat induces prolonged and measurable changes in nociceptive behavior, indicating sensitivity that partially mimics the development of mechanical allodynia and thermal hyperalgesia seen in HZ and PHN patients. Although it is not a model of reactivation, the rat is beginning to inform how VZV infection can evoke a pain response and induce long-lasting alterations to nociception. In this review, we will summarize the rat pain models from a practical perspective and discuss avenues that have opened for testing of novel treatments for both zoster-associated pain and chronic PHN conditions, which remain in critical need of effective therapies.
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14
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Bocharova OV, Fisher A, Pandit NP, Molesworth K, Mychko O, Scott AJ, Makarava N, Ritzel R, Baskakov IV. Aβ plaques do not protect against HSV-1 infection in a mouse model of familial Alzheimer's disease, and HSV-1 does not induce Aβ pathology in a model of late onset Alzheimer's disease. Brain Pathol 2022; 33:e13116. [PMID: 36064300 PMCID: PMC9836376 DOI: 10.1111/bpa.13116] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 07/11/2022] [Indexed: 01/21/2023] Open
Abstract
The possibility that the etiology of late onset Alzheimer's disease is linked to viral infections of the CNS has been actively debated in recent years. According to the antiviral protection hypothesis, viral pathogens trigger aggregation of Aβ peptides that are produced as a defense mechanism in response to infection to entrap and neutralize pathogens. To test the causative relationship between viral infection and Aβ aggregation, the current study examined whether Aβ plaques protect the mouse brain against Herpes Simplex Virus 1 (HSV-1) infection introduced via a physiological route and whether HSV-1 infection triggers formation of Aβ plaques in a mouse model of late-onset AD that does not develop Aβ pathology spontaneously. In aged 5XFAD mice infected via eye scarification, high density of Aβ aggregates did not improve survival time or rate when compared with wild type controls. In 5XFADs, viral replication sites were found in brain areas with a high density of extracellular Aβ deposits, however, no association between HSV-1 and Aβ aggregates could be found. To test whether HSV-1 triggers Aβ aggregation in a mouse model that lacks spontaneous Aβ pathology, 13-month-old hAβ/APOE4/Trem2*R47H mice were infected with HSV-1 via eye scarification with the McKrae HSV-1 strain, intracranial inoculation with McKrae, intracranial inoculation after priming with LPS for 6 weeks, or intracranial inoculation with high doses of McKrae or 17syn + strains that represent different degrees of neurovirulence. No signs of Aβ aggregation were found in any of the experimental groups. Instead, extensive infiltration of peripheral leukocytes was observed during the acute stage of HSV-1 infection, and phagocytic activity of myeloid cells was identified as the primary defense mechanism against HSV-1. The current results argue against a direct causative relationship between HSV-1 infection and Aβ pathology.
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Affiliation(s)
- Olga V. Bocharova
- Center for Biomedical Engineering and TechnologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA,Department of Anatomy and NeurobiologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA
| | - Aidan Fisher
- Center for Biomedical Engineering and TechnologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA,Department of Anatomy and NeurobiologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA
| | - Narayan P. Pandit
- Center for Biomedical Engineering and TechnologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA,Department of Anatomy and NeurobiologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA
| | - Kara Molesworth
- Center for Biomedical Engineering and TechnologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA,Department of Anatomy and NeurobiologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA
| | - Olga Mychko
- Center for Biomedical Engineering and TechnologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA,Department of Anatomy and NeurobiologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA
| | - Alison J. Scott
- Department of Microbial PathogenesisUniversity of Maryland School of DentistryBaltimoreMarylandUSA
| | - Natallia Makarava
- Center for Biomedical Engineering and TechnologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA,Department of Anatomy and NeurobiologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA
| | - Rodney Ritzel
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR)University of Maryland School of MedicineBaltimoreMarylandUSA
| | - Ilia V. Baskakov
- Center for Biomedical Engineering and TechnologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA,Department of Anatomy and NeurobiologyUniversity of Maryland School of MedicineBaltimoreMarylandUSA
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15
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Singh P, Collins MF, Johns RN, Manuel KA, Ye ZA, Bloom DC, Neumann DM. Deletion of the CTRL2 Insulator in HSV-1 Results in the Decreased Expression of Genes Involved in Axonal Transport and Attenuates Reactivation In Vivo. Viruses 2022; 14:v14050909. [PMID: 35632655 PMCID: PMC9144644 DOI: 10.3390/v14050909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 04/25/2022] [Accepted: 04/26/2022] [Indexed: 02/01/2023] Open
Abstract
HSV-1 is a human pathogen that establishes a lifelong infection in the host. HSV-1 is transported by retrograde axonal transport to sensory neurons in the peripheral nervous system where latent viral genomes can reactivate. The resulting virus travels via anterograde axonal transport to the periphery and can cause clinical disease. CTCF insulators flank the LAT and IE regions of HSV-1 and during latency and maintain the integrity of transcriptional domains through a myriad of functions, including enhancer-blocking or barrier-insulator functions. Importantly, during reactivation, CTCF protein is evicted from the HSV-1 genome, especially from the CTRL2 insulator. CTRL2 is a functional insulator downstream of the 5′exon region of the LAT, so these results suggest that the disruption of this insulator may be required for efficient HSV-1 reactivation. To further explore this, we used a recombinant virus containing a deletion of the CTRL2 insulator (ΔCTRL2) in a rabbit ocular model of HSV-1 infection and induced reactivation. We show that, in the absence of the CTRL2 insulator, HSV-1 established an equivalent latent infection in rabbits, but those rabbits failed to efficiently reactivate from latency. Furthermore, we found a significant decrease in the expression of the gene Us9-, a gene that codes for a type II membrane protein that has been shown to be required for anterograde transport in neurons. Taken together, these results suggest that the functions of the CTRL2 insulator and Us9 activation in reactivating neurons are intrinsically linked through the regulation of a gene responsible for the axonal transport of HSV-1 to the periphery.
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Affiliation(s)
- Pankaj Singh
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53716, USA; (P.S.); (M.F.C.); (K.A.M.); (Z.A.Y.)
| | - Matthew F. Collins
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53716, USA; (P.S.); (M.F.C.); (K.A.M.); (Z.A.Y.)
| | - Richard N. Johns
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL 32611, USA; (R.N.J.); (D.C.B.)
| | - Kayley A. Manuel
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53716, USA; (P.S.); (M.F.C.); (K.A.M.); (Z.A.Y.)
| | - Ziyun A. Ye
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53716, USA; (P.S.); (M.F.C.); (K.A.M.); (Z.A.Y.)
| | - David C. Bloom
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL 32611, USA; (R.N.J.); (D.C.B.)
| | - Donna M. Neumann
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, WI 53716, USA; (P.S.); (M.F.C.); (K.A.M.); (Z.A.Y.)
- Correspondence:
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16
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Guo H, Koehler HS, Dix RD, Mocarski ES. Programmed Cell Death-Dependent Host Defense in Ocular Herpes Simplex Virus Infection. Front Microbiol 2022; 13:869064. [PMID: 35464953 PMCID: PMC9023794 DOI: 10.3389/fmicb.2022.869064] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 03/17/2022] [Indexed: 11/13/2022] Open
Abstract
Herpes simplex virus type 1 (HSV1) remains one of the most ubiquitous human pathogens on earth. The classical presentation of HSV1 infection occurs as a recurrent lesions of the oral mucosa commonly refer to as the common cold sore. However, HSV1 also is responsible for a range of ocular diseases in immunocompetent persons that are of medical importance, causing vision loss that may result in blindness. These include a recurrent corneal disease, herpes stromal keratitis, and a retinal disease, acute retinal necrosis, for which clinically relevant animal models exist. Diverse host immune mechanisms mediate control over herpesviruses, sustaining lifelong latency in neurons. Programmed cell death (PCD) pathways including apoptosis, necroptosis, and pyroptosis serve as an innate immune mechanism that eliminates virus-infected cells and regulates infection-associated inflammation during virus invasion. These different types of cell death operate under distinct regulatory mechanisms but all server to curtail virus infection. Herpesviruses, including HSV1, have evolved numerous cell death evasion strategies that restrict the hosts ability to control PCD to subvert clearance of infection and modulate inflammation. In this review, we discuss the key studies that have contributed to our current knowledge of cell death pathways manipulated by HSV1 and relate the contributions of cell death to infection and potential ocular disease outcomes.
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Affiliation(s)
- Hongyan Guo
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, LA, United States
| | - Heather S. Koehler
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA, United States
- School of Molecular Biosciences, College of Veterinary Medicine, Biotechnology Life Sciences, Pullman, WA, United States
| | - Richard D. Dix
- Viral Immunology Center, Department of Biology, Georgia State University, Atlanta, GA, United States
- Department of Ophthalmology, Emory University School of Medicine, Atlanta, GA, United States
| | - Edward S. Mocarski
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA, United States
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17
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Battaglia DM, Sanchez-Pino MD, Nichols CD, Foster TP. Herpes Simplex Virus-1 Induced Serotonin-Associated Metabolic Pathways Correlate With Severity of Virus- and Inflammation-Associated Ocular Disease. Front Microbiol 2022; 13:859866. [PMID: 35391733 PMCID: PMC8982329 DOI: 10.3389/fmicb.2022.859866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 02/22/2022] [Indexed: 11/13/2022] Open
Abstract
Herpes simplex virus-associated diseases are a complex interaction between cytolytic viral replication and inflammation. Within the normally avascular and immunoprivileged cornea, HSV ocular infection can result in vision-threatening immune-mediated herpetic keratitis, the leading infectious cause of corneal blindness in the industrialized world. Viral replicative processes are entirely dependent upon numerous cellular biosynthetic and metabolic pathways. Consistent with this premise, HSV infection was shown to profoundly alter gene expression associated with cellular amino acid biosynthetic pathways, including key tryptophan metabolism genes. The essential amino acid tryptophan is crucial for pathogen replication, the generation of host immune responses, and the synthesis of neurotransmitters, such as serotonin. Intriguingly, Tryptophan hydroxylase 2 (TPH2), the neuronal specific rate-limiting enzyme for serotonin synthesis, was the most significantly upregulated gene by HSV in an amino acid metabolism PCR array. Despite the well-defined effects of serotonin in the nervous system, the association of peripheral serotonin in disease-promoting inflammation has only recently begun to be elucidated. Likewise, the impact of serotonin on viral replication and ocular disease is also largely unknown. We therefore examined the effect of HSV-induced serotonin-associated synthesis and transport pathways on HSV-1 replication, as well as the correlation between HSV-induced ocular serotonin levels and disease severity. HSV infection induced expression of the critical serotonin synthesis enzymes TPH-1, TPH-2, and DOPA decarboxylase (DDC), as well as the serotonin transporter, SERT. Concordantly, HSV-infected cells upregulated serotonin synthesis and its intracellular uptake. Increased serotonin synthesis and uptake was shown to influence HSV replication. Exogenous addition of serotonin increased HSV-1 yield, while both TPH-1/2 and SERT pharmacological inhibition reduced viral yield. Congruent with these in vitro findings, rabbits intraocularly infected with HSV-1 exhibited significantly higher aqueous humor serotonin concentrations that positively and strongly correlated with viral load and ocular disease severity. Collectively, our findings indicate that HSV-1 promotes serotonin synthesis and cellular uptake to facilitate viral replication and consequently, serotonin's proinflammatory effects may enhance the development of ocular disease.
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Affiliation(s)
- Diana Marie Battaglia
- Department of Microbiology, Immunology, and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States
| | - Maria D. Sanchez-Pino
- Department of Interdisciplinary Oncology, Louisiana State University Health Sciences Center, New Orleans, LA, United States
- Department of Genetics, Louisiana State University Health Sciences Center, New Orleans, LA, United States
- The Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, LA, United States
| | - Charles D. Nichols
- Department of Pharmacology and Experimental Therapeutics, School of Medicine, Louisiana State University Health Sciences Center, New Orleans, LA, United States
| | - Timothy P. Foster
- Department of Microbiology, Immunology, and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States
- The Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, LA, United States
- Department of Ophthalmology, Louisiana State University Health Sciences Center, New Orleans, LA, United States
- The Louisiana Vaccine Center, New Orleans, LA, United States
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18
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Yun H, Yin XT, Stuart PM, St Leger AJ. Sensory Nerve Retraction and Sympathetic Nerve Innervation Contribute to Immunopathology of Murine Recurrent Herpes Stromal Keratitis. Invest Ophthalmol Vis Sci 2022; 63:4. [PMID: 35103749 PMCID: PMC8819360 DOI: 10.1167/iovs.63.2.4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Purpose Herpes stromal keratitis (HSK) represents a spectrum of pathologies which is caused by herpes simplex virus type 1 (HSV-1) infection and is considered a leading cause of infectious blindness. HSV-1 infects corneal sensory nerves and establishes latency in the trigeminal ganglion (TG). Recently, retraction of sensory nerves and replacement with “unsensing” sympathetic nerves was identified as a critical contributor of HSK in a mouse model where corneal pathology is caused by primary infection. This resulted in the loss of blink reflex, corneal desiccation, and exacerbation of inflammation leading to corneal opacity. Despite this, it was unclear whether inflammation associated with viral reactivation was sufficient to initiate this cascade of events. Methods We examined viral reactivation and corneal pathology in a mouse model with recurrent HSK by infecting the cornea with HSV-1 (McKrae) and transferring (intravenous [IV]) human sera to establish primary infection without discernible disease and then exposed the cornea to UV-B light to induce viral reactivation. Results UV-B light induced viral reactivation from latency in 100% of mice as measured by HSV-1 antigen deposition in the cornea. Further, unlike conventional HSK models, viral reactivation resulted in focal retraction of sensory nerves and corneal opacity. Dependent on CD4+ T cells, inflammation foci were innervated by sympathetic nerves. Conclusions Collectively, our data reveal that sectoral corneal sensory nerve retraction and replacement of sympathetic nerves were involved in the progressive pathology that is dependent on CD4+ T cells after viral reactivation from HSV-1 latency in the UV-B induced recurrent HSK mouse model.
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Affiliation(s)
- Hongmin Yun
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
| | - Xiao-Tang Yin
- Department of Ophthalmology, Saint Louis University, St. Louis, Missouri, United States
| | - Patrick M Stuart
- Department of Ophthalmology, Saint Louis University, St. Louis, Missouri, United States
| | - Anthony J St Leger
- Department of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.,Department of Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
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19
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Laval K, Enquist LW. The Potential Role of Herpes Simplex Virus Type 1 and Neuroinflammation in the Pathogenesis of Alzheimer's Disease. Front Neurol 2021; 12:658695. [PMID: 33889129 PMCID: PMC8055853 DOI: 10.3389/fneur.2021.658695] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 03/10/2021] [Indexed: 12/12/2022] Open
Abstract
Alzheimer's disease (AD) is a neurodegenerative disease affecting ~50 million people worldwide. To date, there is no cure and current therapies have not been effective in delaying disease progression. Therefore, there is an urgent need for better understanding of the pathogenesis of AD and to rethink possible therapies. Herpes simplex virus type 1 (HSV1) has recently received growing attention for its potential role in sporadic AD. The virus is a ubiquitous human pathogen that infects mucosal epithelia and invades the peripheral nervous system (PNS) of its host to establish a reactivable, latent infection. Upon reactivation, HSV1 spreads back to the epithelium and initiates a new infection, causing epithelial lesions. Occasionally, the virus spreads from the PNS to the brain after reactivation. In this review, we discuss current work on the pathogenesis of AD and summarize research results that support a potential role for HSV1 in the infectious hypothesis of AD. We also highlight recent findings on the neuroinflammatory response, which has been proposed to be the main driving force of AD, starting early in the course of the disease. Relevant rodent models to study neuroinflammation in AD and novel therapeutic approaches are also discussed. Throughout this review, we focus on several aspects of HSV1 pathogenesis, including its primary role as an invader of the PNS, that should be considered in the etiology of AD. We also point out some of the contradictory data and remaining knowledge gaps that require further research to finally fully understand the cause of AD in humans.
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Affiliation(s)
- Kathlyn Laval
- Department of Molecular Biology, Princeton University, Princeton, NJ, United States
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20
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Renner DW, Parsons L, Shreve JT, Engel EA, Kuny CV, Enquist L, Neumann D, Mangold C, Szpara ML. Genome Sequence of the Virulent Model Herpes Simplex Virus 1 Strain McKrae Demonstrates the Presence of at Least Two Widely Used Variant Strains. Microbiol Resour Announc 2021; 10:e01146-19. [PMID: 33766904 PMCID: PMC7996463 DOI: 10.1128/mra.01146-19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 03/03/2021] [Indexed: 02/07/2023] Open
Abstract
Herpes simplex virus 1 (HSV-1) strain McKrae was isolated in 1965 and has been utilized by many laboratories. Three HSV-1 strain McKrae stocks have been sequenced previously, revealing discrepancies in key genes. We sequenced the genome of HSV-1 strain McKrae from the laboratory of James M. Hill to better understand the genetic differences between isolates.
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Affiliation(s)
- Daniel W Renner
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, USA
- Department of Biochemistry and Molecular Biology, Center for Infectious Disease Dynamics, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, Pennsylvania, USA
| | - Lance Parsons
- Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, New Jersey, USA
| | - Jacob T Shreve
- Department of Biochemistry and Molecular Biology, Center for Infectious Disease Dynamics, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, Pennsylvania, USA
| | - Esteban A Engel
- Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey, USA
| | - Chad V Kuny
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, USA
- Department of Biochemistry and Molecular Biology, Center for Infectious Disease Dynamics, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, Pennsylvania, USA
| | - Lynn Enquist
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, USA
| | - Donna Neumann
- Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
| | - Colleen Mangold
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, USA
- Department of Entomology, Pennsylvania State University, University Park, Pennsylvania, USA
| | - Moriah L Szpara
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, USA
- Department of Biochemistry and Molecular Biology, Center for Infectious Disease Dynamics, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, Pennsylvania, USA
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21
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Dogrammatzis C, Waisner H, Kalamvoki M. "Non-Essential" Proteins of HSV-1 with Essential Roles In Vivo: A Comprehensive Review. Viruses 2020; 13:E17. [PMID: 33374862 PMCID: PMC7824580 DOI: 10.3390/v13010017] [Citation(s) in RCA: 11] [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: 11/24/2020] [Revised: 12/17/2020] [Accepted: 12/18/2020] [Indexed: 12/19/2022] Open
Abstract
Viruses encode for structural proteins that participate in virion formation and include capsid and envelope proteins. In addition, viruses encode for an array of non-structural accessory proteins important for replication, spread, and immune evasion in the host and are often linked to virus pathogenesis. Most virus accessory proteins are non-essential for growth in cell culture because of the simplicity of the infection barriers or because they have roles only during a state of the infection that does not exist in cell cultures (i.e., tissue-specific functions), or finally because host factors in cell culture can complement their absence. For these reasons, the study of most nonessential viral factors is more complex and requires development of suitable cell culture systems and in vivo models. Approximately half of the proteins encoded by the herpes simplex virus 1 (HSV-1) genome have been classified as non-essential. These proteins have essential roles in vivo in counteracting antiviral responses, facilitating the spread of the virus from the sites of initial infection to the peripheral nervous system, where it establishes lifelong reservoirs, virus pathogenesis, and other regulatory roles during infection. Understanding the functions of the non-essential proteins of herpesviruses is important to understand mechanisms of viral pathogenesis but also to harness properties of these viruses for therapeutic purposes. Here, we have provided a comprehensive summary of the functions of HSV-1 non-essential proteins.
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Affiliation(s)
| | | | - Maria Kalamvoki
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS 66160, USA; (C.D.); (H.W.)
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22
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Courrier E, Maurin C, Lambert V, Renault D, Bourlet T, Pillet S, Verhoeven PO, Forest F, Perrache C, He Z, Garcin T, Rousseau A, Labetoulle M, Gain P, Thuret G. Ex vivo model of herpes simplex virus type I dendritic and geographic keratitis using a corneal active storage machine. PLoS One 2020; 15:e0236183. [PMID: 32697805 PMCID: PMC7375596 DOI: 10.1371/journal.pone.0236183] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Accepted: 06/30/2020] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Herpetic keratitis (HK) models using whole human corneas are essential for studying virus-host relationships, because of high species specificity and the role of interactions between corneal cell populations that cell culture cannot reproduce. Nevertheless, the two current corneal storage methods (hypothermia and organ culture (OC)) do not preserve corneas in good physiological condition, as they are characterized by epithelial abrasion, stromal oedema, and excessive endothelial mortality. METHODS To rehabilitate human corneas intended for scientific use, we used an active storage machine (ASM) that restores two physiological parameters that are essential for corneal homeostasis: intraocular pressure and storage medium renewal (21mmHg and 2.6 μL/min, respectively). ASM storage regenerates a normal multilayer epithelium in 2 weeks. We infected six pairs of corneas unsuitable for graft by inoculating the epithelium with herpes simplex virus type 1 (HSV-1), and compared each ASM-stored cornea with the other cornea stored in the same medium using the conventional OC method. RESULTS Only corneas in the ASM developed a dendritic (n = 3) or geographic (n = 2) epithelial ulcer reproducing typical HSV-1-induced clinical lesions. Corneas in OC showed only extensive desquamations. None of the uninfected controls showed epithelial damage. Histology, immunohistochemistry, transmission electron microscopy and polymerase chain reaction on corneal tissue confirmed infection in all cases (excluding negative controls). CONCLUSIONS The ASM provides an innovative ex vivo model of HK in whole human cornea that reproduces typical epithelial lesions.
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Affiliation(s)
- Emilie Courrier
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
| | - Corantin Maurin
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
| | - Victor Lambert
- Department of Ophthalmology, University Hospital, Saint-Etienne, France
| | - Didier Renault
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
| | - Thomas Bourlet
- Laboratory of Infectious Agents and Hygiene GIMAP-EA3064, University Hospital & University Jean Monnet, Saint-Etienne, France
| | - Sylvie Pillet
- Laboratory of Infectious Agents and Hygiene GIMAP-EA3064, University Hospital & University Jean Monnet, Saint-Etienne, France
| | - Paul O. Verhoeven
- Laboratory of Infectious Agents and Hygiene GIMAP-EA3064, University Hospital & University Jean Monnet, Saint-Etienne, France
| | - Fabien Forest
- Department of Pathology, University Hospital, Saint-Etienne, France
| | - Chantal Perrache
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
| | - Zhiguo He
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
| | - Thibaud Garcin
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
- Department of Ophthalmology, University Hospital, Saint-Etienne, France
| | - Antoine Rousseau
- Department of Ophthalmology, Bicêtre Hospital, APHP, South Paris University, Le Kremlin-Bicêtre, France
- Center for Immunology of Viral Infections and Autoimmune Diseases, IMVA, UMR, INSERM, CEA, South Paris University, Fontenay-aux-Roses, France
| | - Marc Labetoulle
- Department of Ophthalmology, Bicêtre Hospital, APHP, South Paris University, Le Kremlin-Bicêtre, France
- Center for Immunology of Viral Infections and Autoimmune Diseases, IMVA, UMR, INSERM, CEA, South Paris University, Fontenay-aux-Roses, France
| | - Philippe Gain
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
- Department of Ophthalmology, University Hospital, Saint-Etienne, France
| | - Gilles Thuret
- Corneal Graft Biology, Engineering and Imaging Laboratory, Health Innovation Campus, Faculty of Medicine, Jean Monnet University, Saint-Etienne, France
- Department of Ophthalmology, University Hospital, Saint-Etienne, France
- Institut Universitaire de France, Paris, France
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Bello-Morales R, Andreu S, López-Guerrero JA. The Role of Herpes Simplex Virus Type 1 Infection in Demyelination of the Central Nervous System. Int J Mol Sci 2020; 21:ijms21145026. [PMID: 32708697 PMCID: PMC7404202 DOI: 10.3390/ijms21145026] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/14/2020] [Accepted: 07/15/2020] [Indexed: 12/13/2022] Open
Abstract
Herpes simplex type 1 (HSV-1) is a neurotropic virus that infects the peripheral and central nervous systems. After primary infection in epithelial cells, HSV-1 spreads retrogradely to the peripheral nervous system (PNS), where it establishes a latent infection in the trigeminal ganglia (TG). The virus can reactivate from the latent state, traveling anterogradely along the axon and replicating in the local surrounding tissue. Occasionally, HSV-1 may spread trans-synaptically from the TG to the brainstem, from where it may disseminate to higher areas of the central nervous system (CNS). It is not completely understood how HSV-1 reaches the CNS, although the most accepted idea is retrograde transport through the trigeminal or olfactory tracts. Once in the CNS, HSV-1 may induce demyelination, either as a direct trigger or as a risk factor, modulating processes such as remyelination, regulation of endogenous retroviruses, or molecular mimicry. In this review, we describe the current knowledge about the involvement of HSV-1 in demyelination, describing the pathways used by this herpesvirus to spread throughout the CNS and discussing the data that suggest its implication in demyelinating processes.
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Affiliation(s)
- Raquel Bello-Morales
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; (S.A.); (J.A.L.-G.)
- Centro de Biología Molecular Severo Ochoa, CSIC-UAM, Cantoblanco, 28049 Madrid, Spain
- Correspondence:
| | - Sabina Andreu
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; (S.A.); (J.A.L.-G.)
- Centro de Biología Molecular Severo Ochoa, CSIC-UAM, Cantoblanco, 28049 Madrid, Spain
| | - José Antonio López-Guerrero
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; (S.A.); (J.A.L.-G.)
- Centro de Biología Molecular Severo Ochoa, CSIC-UAM, Cantoblanco, 28049 Madrid, Spain
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24
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Barrozo ER, Nakayama S, Singh P, Vanni EAH, Arvin AM, Neumann DM, Bloom DC. Deletion of Herpes Simplex Virus 1 MicroRNAs miR-H1 and miR-H6 Impairs Reactivation. J Virol 2020; 94:e00639-20. [PMID: 32295910 PMCID: PMC7375377 DOI: 10.1128/jvi.00639-20] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/07/2020] [Indexed: 12/13/2022] Open
Abstract
During all stages of infection, herpes simplex virus 1 (HSV-1) expresses viral microRNAs (miRNAs). There are at least 20 confirmed HSV-1 miRNAs, yet the roles of individual miRNAs in the context of viral infection remain largely uncharacterized. We constructed a recombinant virus lacking the sequences for miR-H1-5p and miR-H6-3p (17dmiR-H1/H6). The seed sequences for these miRNAs are antisense to each other and are transcribed from divergent noncoding RNAs in the latency-associated transcript (LAT) promoter region. Comparing phenotypes exhibited by the recombinant virus lacking these miRNAs to the wild type (17syn+), we found that during acute infection in cell culture, 17dmiR-H1/H6 exhibited a modest increase in viral yields. Analysis of pathogenesis in the mouse following footpad infection revealed a slight increase in virulence for 17dmiR-H1/H6 but no significant difference in the establishment or maintenance of latency. Strikingly, explant of latently infected dorsal root ganglia revealed a decreased and delayed reactivation phenotype. Further, 17dmiR-H1/H6 was severely impaired in epinephrine-induced reactivation in the rabbit ocular model. Finally, we demonstrated that deletion of miR-H1/H6 increased the accumulation of the LAT as well as several of the LAT region miRNAs. These results suggest that miR-H1/H6 plays an important role in facilitating efficient reactivation from latency.IMPORTANCE While HSV antivirals reduce the severity and duration of clinical disease in some individuals, there is no vaccine or cure. Therefore, understanding the mechanisms regulating latency and reactivation as a potential to elucidate targets for better therapeutics is important. There are at least 20 confirmed HSV-1 miRNAs, yet the roles of individual miRNAs in the context of viral infection remain largely uncharacterized. The present study focuses on two of the miRNAs (miR-H1/H6) that are encoded within the latency-associated transcript (LAT) region, a portion of the genome that has been associated with efficient reactivation. Here, we demonstrate that the deletion of the seed sequences of these miRNAs results in a severe reduction in reactivation of HSV-1 in the mouse and rabbit models. These results suggest a linkage between these miRNAs and reactivation.
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Affiliation(s)
- Enrico R Barrozo
- Department of Molecular Genetics & Microbiology, University of Florida College of Medicine, Gainesville, Florida, USA
- UF Genetics Institute, University of Florida, Gainesville, Florida, USA
| | - Sanae Nakayama
- Department of Molecular Genetics & Microbiology, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Pankaj Singh
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Emilia A H Vanni
- Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California, USA
| | - Ann M Arvin
- Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California, USA
| | - Donna M Neumann
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - David C Bloom
- Department of Molecular Genetics & Microbiology, University of Florida College of Medicine, Gainesville, Florida, USA
- UF Genetics Institute, University of Florida, Gainesville, Florida, USA
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25
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Li L, Li Y, Li X, Xia Y, Wang E, Gong D, Chen G, Yang L, Zhang K, Zhao Z, Fraser NW, Fan Q, Li B, Zhang H, Cao X, Zhou J. HSV-1 infection and pathogenesis in the tree shrew eye following corneal inoculation. J Neurovirol 2020; 26:391-403. [PMID: 32301037 DOI: 10.1007/s13365-020-00837-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 02/07/2020] [Accepted: 03/09/2020] [Indexed: 11/27/2022]
Abstract
Herpes simplex virus type I (HSV-1) infection causes inflammation in the cornea known as herpes simplex virus keratitis (HSK), a common but serious corneal disease. It is not entirely clear whether the virus during recurring infection comes from the trigeminal ganglia or the eye tissue, including the retina and ciliary ganglion. Because the tree shrew is closely related to primates and tree shrew eye anatomic structures are similar to humans, we studied HSV-1 corneal infection in the tree shrew. We found that HSK symptoms closely mimic those found in human HSK showing typical punctiform and dendritic viral keratitis during the acute infection period. Following the HSV-specific lesions, complications such as stromal scarring, corneal thickening (primary infection), opacity, and neovascularization were observed. In the tree shrew model, following ocular inoculation, the cornea becomes infected, and viral protein can be detected using anti-HSV-1 antibodies in the epithelial layer and retina neuronal ganglion cells. The HSV-1 transcripts, ICP0, ICP4, and LAT can be detected at 3 days post-infection (dpi), peaking at 5 dpi. After 2 weeks, ICP4 and ICP0 transcripts are reduced to a basal level, but the Latency Associated Transcripts (LATs) continue to accumulate. Interestingly, after the acute infection, we still detected abundant active HSV-1 in tree shrew eyes. Further, we found HSV-1 persistent in the ciliary ganglion and cornea. These findings are discussed in support of the tree shrew as a non-human primate HSK model, which could be useful for mechanistic studies of HSK.
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Affiliation(s)
- Lihong Li
- Key Laboratory of Animal Models and Human Disease Mechanism of the Chinese Academy of Science/Key Laboratory of Healthy Aging Research of Yunnan Province, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming, 650223, Yunnan, China.,Center for Disease Control and Prevention of Western Theater Command, Chengdu, 610021, Sichuan, China.,Kunming Primate Research Center, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, Yunnan, China.,Center for Drug Safety Evaluation, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
| | - Yan Li
- Department of Ophthalmology, The Second People Hospital of Yunnan Province, Kunming, 650031, Yunnan, China
| | - Xin Li
- Key Laboratory of Animal Models and Human Disease Mechanism of the Chinese Academy of Science/Key Laboratory of Healthy Aging Research of Yunnan Province, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
| | - Yujie Xia
- Center for Drug Safety Evaluation, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, Yunnan, China.,Qingdao Haihua Biomedicine Technology Co. Ltd, Qingdao, 266555, Shandong, China
| | - Erlin Wang
- Key Laboratory of Animal Models and Human Disease Mechanism of the Chinese Academy of Science/Key Laboratory of Healthy Aging Research of Yunnan Province, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
| | - Daohua Gong
- Key Laboratory of Animal Models and Human Disease Mechanism of the Chinese Academy of Science/Key Laboratory of Healthy Aging Research of Yunnan Province, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
| | - Guijun Chen
- Key Laboratory of Animal Models and Human Disease Mechanism of the Chinese Academy of Science/Key Laboratory of Healthy Aging Research of Yunnan Province, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
| | - Liping Yang
- Key Laboratory of Animal Models and Human Disease Mechanism of the Chinese Academy of Science/Key Laboratory of Healthy Aging Research of Yunnan Province, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming, 650223, Yunnan, China
| | - Ke Zhang
- Department of Key Laboratory, The Second Affiliated Hospital of Kunming Medical University, Kunming, 650101, Yunnan, China
| | - Zhuanghong Zhao
- Department of Ophthalmology, The First Affiliated Hospital of Kunming Medical University, Kunming, 650032, Yunnan, China
| | - Nigel W Fraser
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Quanshui Fan
- Center for Disease Control and Prevention of Western Theater Command, Chengdu, 610021, Sichuan, China.
| | - Bing Li
- Kunming Primate Research Center, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, Yunnan, China. .,Center for Drug Safety Evaluation, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, Yunnan, China.
| | - Hui Zhang
- Department of Ophthalmology, The First Affiliated Hospital of Kunming Medical University, Kunming, 650032, Yunnan, China.
| | - Xia Cao
- Department of Key Laboratory, The Second Affiliated Hospital of Kunming Medical University, Kunming, 650101, Yunnan, China.
| | - Jumin Zhou
- Key Laboratory of Animal Models and Human Disease Mechanism of the Chinese Academy of Science/Key Laboratory of Healthy Aging Research of Yunnan Province, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming, 650223, Yunnan, China.
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26
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Sun B, Wang Q, Pan D. [Mechanisms of herpes simplex virus latency and reactivation]. Zhejiang Da Xue Xue Bao Yi Xue Ban 2019; 48:89-101. [PMID: 31102363 PMCID: PMC8800643 DOI: 10.3785/j.issn.1008-9292.2019.02.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 11/20/2018] [Indexed: 06/09/2023]
Abstract
Herpes simplex virus (HSV), including HSV-1 and HSV-2, is an important pathogen that can cause many diseases. Usually these diseases are recurrent and incurable. After lytic infection on the surface of peripheral mucosa, HSV can enter sensory neurons and establish latent infection during which viral replication ceases. Moreover, latent virus can re-enter the replication cycle by reactivation and return to peripheral tissues to start recurrent infection. This ability to escape host immune surveillance during latent infection and to spread during reactivation is a viral survival strategy and the fundamental reason why no drug can completely eradicate the virus at present. Although there are many studies on latency and reactivation of HSV, and much progress has been made, many specific mechanisms of the process remain obscure or even controversial due to the complexity of this process and the limitations of research models. This paper reviews the major results of research on HSV latency and reactivation, and discusses future research directions in this field.
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Affiliation(s)
- Boqiang Sun
- Department of Microbiology and Parasitology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Qiongyan Wang
- Department of Microbiology and Parasitology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Dongli Pan
- Department of Microbiology and Parasitology, Zhejiang University School of Medicine, Hangzhou 310058, China
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27
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Tian X, Wang T, Zhang S, Wang Q, Hu X, Ge C, Xie L, Zhou Q. PEDF Reduces the Severity of Herpetic Simplex Keratitis in Mice. Invest Ophthalmol Vis Sci 2019; 59:2923-2931. [PMID: 30025136 DOI: 10.1167/iovs.18-23942] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose The purpose of this study was to explore the effects of pigment epithelium derived factor (PEDF) and PEDF-derived peptides Mer44 and Mer34 on the severity of herpetic simplex keratitis (HSK) in mice. Methods Adult C57BL/6 mice were infected ocularly with the herpes simplex virus type 1 (HSV-1, McKrae strain) and injected subconjunctivally with PEDF, Mer44, or Mer34. Corneal nerve degeneration, neovascularization, sensitivity, neutrophils, macrophages and CD4+ T-cell infiltration, virus contents, and expressions of VEGF, PEDF, and proinflammatory factors were evaluated during acute period. The direct inhibitory effect of PEDF on HSV-1 replication was further evaluated in cultured monkey Vero cells. Results Following HSV-1 infection, corneal PEDF expression decreased at 3 and 7 days postinfection (dpi) but increased at 15 dpi, and returned to the similar level of normal mice at 45 dpi, which was accompanied with the progress of corneal nerve degeneration and neovascularization. Exogenous PEDF application attenuated corneal nerve degeneration and neovascularization and improved the impaired corneal sensitivity. Moreover, PEDF attenuated the neutrophils, but not macrophage or CD4+ T-cell infiltration, with the reduced expressions of IL-1β, IL-6, TNF-α, and VEGF. In addition, PEDF inhibited the replication of HSV-1 both in vitro and in mice. Mer44 attenuated corneal nerve degeneration more significantly than Mer34, whereas Mer34 inhibited corneal neovascularization. Conclusions PEDF and its derived peptides reduce the severity of herpetic simplex keratitis in mice, representing the potential therapeutic approach to control HSK lesions.
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Affiliation(s)
- Xiao Tian
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
| | - Tongsong Wang
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
| | - Songmei Zhang
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
| | - Qian Wang
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
| | - Xiaoli Hu
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
| | - Cheng Ge
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
| | - Lixin Xie
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
| | - Qingjun Zhou
- State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, China
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28
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Interaction between the cellular E3 ubiquitin ligase SIAH-1 and the viral immediate-early protein ICP0 enables efficient replication of Herpes Simplex Virus type 2 in vivo. PLoS One 2018; 13:e0201880. [PMID: 30080903 PMCID: PMC6078308 DOI: 10.1371/journal.pone.0201880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 07/24/2018] [Indexed: 01/17/2023] Open
Abstract
Herpes Simplex Virus type 2 (HSV-2) is a neurotropic human pathogen. Upon de novo infection, the viral infected cell protein 0 (ICP0) is immediately expressed and interacts with various cellular components during the viral replication cycle. ICP0 is a multifunctional regulatory protein that has been shown to be important for both efficient viral replication and virus reactivation from latency. In particular, as previously demonstrated in transfected tissue culture models, ICP0 interacts with the cellular E3 ubiquitin ligase SIAH-1, which targets ICP0 for proteasomal degradation. However, the consequence of this virus-host interaction during the establishment of HSV-2 infection in vivo has not yet been elucidated. Here we confirmed that ICP0 of HSV-2 interacts with SIAH-1 via two conserved PxAxVxP amino acid binding motifs. We also demonstrate in vitro that a SIAH-1 binding-deficient HSV-2 strain, constructed by homologous recombination technology, exhibits an attenuated growth curve and impaired DNA and protein synthesis. This attenuated phenotype was also confirmed in an in vivo ocular infection mouse model. Specifically, viral load of the SIAH-1 binding-deficient HSV-2 mutant was significantly reduced in the trigeminal ganglia and brain stem at day 5 and 7 post infection. Our findings indicate that the interplay between ICP0 and SIAH-1 is important for efficient HSV-2 replication in vivo, thereby affecting viral dissemination kinetics in newly infected organisms, and possibly revealing novel targets for antiviral therapy.
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29
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Human Asymptomatic Epitope Peptide/CXCL10-Based Prime/Pull Vaccine Induces Herpes Simplex Virus-Specific Gamma Interferon-Positive CD107 + CD8 + T Cells That Infiltrate the Corneas and Trigeminal Ganglia of Humanized HLA Transgenic Rabbits and Protect against Ocular Herpes Challenge. J Virol 2018; 92:JVI.00535-18. [PMID: 29899087 DOI: 10.1128/jvi.00535-18] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 05/21/2018] [Indexed: 12/12/2022] Open
Abstract
Herpes simplex virus 1 (HSV-1) is a prevalent human pathogen that infects the cornea, causing potentially blinding herpetic disease. A clinical herpes vaccine is still lacking. In the present study, a novel prime/pull vaccine was tested in a human leukocyte antigen (HLA) transgenic rabbit model of ocular herpes (HLA Tg rabbits). Three peptide epitopes were selected, from the HSV-1 membrane glycoprotein C (UL44400-408), the DNA replication binding helicase (UL9196-204), and the tegument protein (UL25572-580), all preferentially recognized by CD8+ T cells from "naturally protected" HSV-1-seropositive healthy asymptomatic (ASYMP) individuals (who never had recurrent corneal herpetic disease). HLA Tg rabbits were immunized with a mixture of these three ASYMP CD8+ T cell peptide epitopes (UL44400-408, UL9196-204, and UL25572-580), which were delivered subcutaneously with CpG2007 adjuvant (prime). Fifteen days later, half of the rabbits received a topical ocular treatment with a recombinant neurotropic adeno-associated virus type 8 (AAV8) vector expressing the T cell-attracting CXCL10 chemokine (pull). The frequency and function of HSV-specific CD8+ T cells induced by the prime/pull vaccine were assessed in the peripheral blood, cornea, and trigeminal ganglion (TG). Compared to the cells generated in response to peptide immunization alone, the peptide/CXCL10 prime/pull vaccine generated frequent polyfunctional gamma interferon-positive (IFN-γ+) CD107+ CD8+ T cells that infiltrated both the cornea and TG. CD8+ T cell mobilization into the cornea and TG of prime/pull-vaccinated rabbits was associated with a significant reduction in corneal herpesvirus infection and disease following an ocular HSV-1 (strain McKrae) challenge. These findings draw attention to the novel prime/pull vaccine strategy for mobilizing antiviral CD8+ T cells into tissues to protect against herpesvirus infection and disease.IMPORTANCE There is an urgent need for a vaccine against widespread herpes simplex virus infections. The present study demonstrates that immunization of HLA transgenic rabbits with a peptide/CXCL10 prime/pull vaccine triggered mobilization of HSV-specific CD8+ T cells locally into the cornea and TG, the sites of acute and latent herpesvirus infections, respectively. Mobilization of antiviral CD8+ T cells into the cornea and TG of rabbits that received the prime/pull vaccine was associated with protection against ocular herpesvirus infection and disease following an ocular HSV-1 challenge. These results highlight the importance of the prime/pull vaccine strategy to bolster the number and function of protective CD8+ T cells within infected tissues.
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30
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Innate Immune Mechanisms and Herpes Simplex Virus Infection and Disease. ADVANCES IN ANATOMY EMBRYOLOGY AND CELL BIOLOGY 2018; 223:49-75. [PMID: 28528439 DOI: 10.1007/978-3-319-53168-7_3] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Innate immune responses play a major role in the control of herpes simplex virus (HSV) infections, and a multiplicity of mechanisms have emerged as a result of human evolution to sense and respond to HSV infections. HSV in turn has evolved a number of ways to evade immune detection and to blunt human innate immune responses. In this review, we summarize the major host innate immune mechanisms and the HSV evasion mechanisms that have evolved. We further discuss how disease can result if this equilibrium between virus and host response is disrupted.
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31
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Wu M, Zhu Y, Cong F, Rao D, Yuan W, Wang J, Huang B, Lian Y, Zhang Y, Huang R, Guo P. Rapid detection of three rabbit pathogens by use of the Luminex x-TAG assay. BMC Vet Res 2018; 14:127. [PMID: 29625588 PMCID: PMC5889542 DOI: 10.1186/s12917-018-1438-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 03/19/2018] [Indexed: 01/18/2023] Open
Abstract
Background Domestic rabbits especially New Zealand white rabbits play an important role in biological research. The disease surveillance and quality control are essential to guarantee the results of animal experiments performed on rabbits. Rabbit hemorrhagic disease virus, rabbit rotavirus and Sendai virus are the important pathogens that needed to be eliminated. Rapid and sensitive method focus on these three viruses should be established for routine monitoring. The Luminex x-TAG assay based on multiplex PCR and fluorescent microsphere is a fast developing technology applied in high throughput detection. Specific primers modified with oligonucleotide sequence/biotin were used to amplify target fragments. The conjugation between oligonucleotide sequence of the PCR products and the MagPlex-TAG microspheres was specific without any cross-reaction, and the hybridization products could be analyzed using the Luminex 200 analyzer instrument. Recombinant plasmids were constructed to estimate the detection limit of the viruses. Furthermore, 40 clinical samples were used to evaluate the efficiency of this multiplex PCR based Luminex x-TAG assay. Results According to the results, this new method showed high specificity and good stability. Assessed by the recombinant plasmids, the detection limit of three viruses was 100copies/μl. Among 40 clinical specimens, 18 specimens were found positive, which was completely concordant with the conventional PCR method. Conclusions The new developed Luminex x-TAG assay is an accurate, high throughput method for rapid detection of three important viruses of rabbits.
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Affiliation(s)
- Miaoli Wu
- Guangdong Provincial Key Laboratory of Laboratory Animals, Guangzhou, 510633, China.,Guangdong Laboratory Animal Monitoring Institute, Guangzhou, China
| | - Yujun Zhu
- Guangdong Laboratory Animal Monitoring Institute, Guangzhou, China
| | - Feng Cong
- Guangdong Provincial Key Laboratory of Laboratory Animals, Guangzhou, 510633, China
| | - Dan Rao
- Guangdong Laboratory Animal Monitoring Institute, Guangzhou, China
| | - Wen Yuan
- Guangdong Provincial Key Laboratory of Laboratory Animals, Guangzhou, 510633, China
| | - Jing Wang
- Guangdong Provincial Key Laboratory of Laboratory Animals, Guangzhou, 510633, China
| | - Bihong Huang
- Guangdong Laboratory Animal Monitoring Institute, Guangzhou, China
| | - Yuexiao Lian
- Guangdong Laboratory Animal Monitoring Institute, Guangzhou, China
| | - Yu Zhang
- Guangdong Laboratory Animal Monitoring Institute, Guangzhou, China
| | - Ren Huang
- Guangdong laboratory animals monitoring institute, Guangzhou, 510633, China.
| | - Pengju Guo
- Guangdong key laboratory of laboratory Animals, Guangzhou, China.
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Rajasagi NK, Rouse BT. Application of our understanding of pathogenesis of herpetic stromal keratitis for novel therapy. Microbes Infect 2018; 20:526-530. [PMID: 29329934 DOI: 10.1016/j.micinf.2017.12.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 12/18/2017] [Accepted: 12/20/2017] [Indexed: 12/31/2022]
Abstract
HSV-1 ocular infection can cause herpes stromal keratitis (SK), an immunopathological lesion. Frequent recurrences can lead to progressive corneal scaring which can result in vision impairment if left untreated. Currently, the acute and epithelial forms of SK are usually controlled using anti-viral drugs. However, chronic forms of SK which are inflammatory in nature, require the addition of a topical corticosteroid to the anti-viral treatment regimen. In this review, we highlight the essential events involved in SK pathogenesis which can be targeted for improved therapy. We also examine some approaches which can be combined with the current treatments to effectively control SK.
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Affiliation(s)
- Naveen K Rajasagi
- Biomedical & Diagnostic Sciences, College of Veterinary Medicine, The University of Tennessee, Knoxville, TN, 37996-0845, United States
| | - Barry T Rouse
- Biomedical & Diagnostic Sciences, College of Veterinary Medicine, The University of Tennessee, Knoxville, TN, 37996-0845, United States.
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33
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Pennington MR, Ledbetter EC, Van de Walle GR. New Paradigms for the Study of Ocular Alphaherpesvirus Infections: Insights into the Use of Non-Traditional Host Model Systems. Viruses 2017; 9:E349. [PMID: 29156583 PMCID: PMC5707556 DOI: 10.3390/v9110349] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 11/14/2017] [Accepted: 11/16/2017] [Indexed: 12/22/2022] Open
Abstract
Ocular herpesviruses, most notably human alphaherpesvirus 1 (HSV-1), canid alphaherpesvirus 1 (CHV-1) and felid alphaherpesvirus 1 (FHV-1), infect and cause severe disease that may lead to blindness. CHV-1 and FHV-1 have a pathogenesis and induce clinical disease in their hosts that is similar to HSV-1 ocular infections in humans, suggesting that infection of dogs and cats with CHV-1 and FHV-1, respectively, can be used as a comparative natural host model of herpesvirus-induced ocular disease. In this review, we discuss both strengths and limitations of the various available model systems to study ocular herpesvirus infection, with a focus on the use of these non-traditional virus-natural host models. Recent work has demonstrated the robustness and reproducibility of experimental ocular herpesvirus infections in dogs and cats, and, therefore, these non-traditional models can provide additional insights into the pathogenesis of ocular herpesvirus infections.
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Affiliation(s)
- Matthew R Pennington
- Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
| | - Eric C Ledbetter
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
| | - Gerlinde R Van de Walle
- Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
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Xu X, Fan S, Wang X, Hu Y, Feng M, Wang L, Zhang Y, Liao Y, Zhang X, Li Q. Analysis of the Protective Immunity Induced by Herpes Simplex Virus 1 Strain M3 with an Attenuated Phenotype Due to Mutations in the Viral ul7, ul41, and LAT Genes. Front Microbiol 2017; 8:1958. [PMID: 29062310 PMCID: PMC5640706 DOI: 10.3389/fmicb.2017.01958] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 09/22/2017] [Indexed: 01/30/2023] Open
Abstract
Herpes simplex virus 1 (HSV1) is an important pathogen with a worldwide epidemic trend that affects populations of various ages. It has a high morbidity, particularly in juveniles, but a successful HSV1 vaccine is not currently available. Thus, our study systematically observed the immune responses induced in mice immunized with the attenuated HSV1 M3 mutant strain, which has mutations in the genes encoding the UL7 and Vhs tegument proteins and the latency-associated transcript. The immunity induced by the M3 mutant strain can control acute viral infection during HSV1 wild-type strain infection. Moreover, this immunity exerts a potent effect on controlling viral entry into the trigeminal neurons. These data encourage further studies investigating the development of M3 as a potential vaccine candidate, and much work is necessary to evaluate the safety and improve the immunogenicity of this strain.
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Affiliation(s)
- Xingli Xu
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Shengtao Fan
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Xi Wang
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Yunguang Hu
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Min Feng
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Lichun Wang
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Ying Zhang
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Yun Liao
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Xiaolong Zhang
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Qihan Li
- Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
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CXCL10/CXCR3-Dependent Mobilization of Herpes Simplex Virus-Specific CD8 + T EM and CD8 + T RM Cells within Infected Tissues Allows Efficient Protection against Recurrent Herpesvirus Infection and Disease. J Virol 2017; 91:JVI.00278-17. [PMID: 28468883 DOI: 10.1128/jvi.00278-17] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 04/25/2017] [Indexed: 12/22/2022] Open
Abstract
Herpes simplex virus 1 (HSV-1) establishes latency within the sensory neurons of the trigeminal ganglia (TG). HSV-specific memory CD8+ T cells play a critical role in preventing HSV-1 reactivation from TG and subsequent virus shedding in tears that trigger recurrent corneal herpetic disease. The CXC chemokine ligand 10 (CXCL10)/CXC chemokine receptor 3 (CXCR3) chemokine pathway promotes T cell immunity to many viral pathogens, but its importance in CD8+ T cell immunity to recurrent herpes has been poorly elucidated. In this study, we determined how the CXCL10/CXCR3 pathway affects TG- and cornea-resident CD8+ T cell responses to recurrent ocular herpesvirus infection and disease using a well-established murine model in which HSV-1 reactivation was induced from latently infected TG by UV-B light. Following UV-B-induced HSV-1 reactivation, a significant increase in both the number and function of HSV-specific CXCR3+ CD8+ T cells was detected in TG and corneas of protected C57BL/6 (B6) mice, but not in TG and corneas of nonprotected CXCL10-/- or CXCR3-/- deficient mice. This increase was associated with a significant reduction in both virus shedding and recurrent corneal herpetic disease. Furthermore, delivery of exogenous CXCL10 chemokine in TG of CXCL10-/- mice, using the neurotropic adeno-associated virus type 8 (AAV8) vector, boosted the number and function of effector memory CD8+ T cells (TEM) and tissue-resident memory CD8+ T cells (TRM), but not of central memory CD8+ T cells (TCM), locally within TG, and improved protection against recurrent herpesvirus infection and disease in CXCL10-/- deficient mice. These findings demonstrate that the CXCL10/CXCR3 chemokine pathway is critical in shaping CD8+ T cell immunity, locally within latently infected tissues, which protects against recurrent herpesvirus infection and disease.IMPORTANCE We determined how the CXCL10/CXCR3 pathway affects CD8+ T cell responses to recurrent ocular herpesvirus infection and disease. Using a well-established murine model, in which HSV-1 reactivation in latently infected trigeminal ganglia was induced by UV-B light, we demonstrated that lack of either CXCL10 chemokine or its CXCR3 receptor compromised the mobilization of functional CD8+ TEM and CD8+ TRM cells within latently infected trigeminal ganglia following virus reactivation. This lack of T cell mobilization was associated with an increase in recurrent ocular herpesvirus infection and disease. Inversely, augmenting the amount of CXCL10 in trigeminal ganglia of latently infected CXCL10-deficient mice significantly restored the number of local antiviral CD8+ TEM and CD8+ TRM cells associated with protection against recurrent ocular herpes. Based on these findings, a novel "prime/pull" therapeutic ocular herpes vaccine strategy is proposed and discussed.
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Pourchet A, Modrek AS, Placantonakis DG, Mohr I, Wilson AC. Modeling HSV-1 Latency in Human Embryonic Stem Cell-Derived Neurons. Pathogens 2017; 6:E24. [PMID: 28594343 PMCID: PMC5488658 DOI: 10.3390/pathogens6020024] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 06/02/2017] [Accepted: 06/06/2017] [Indexed: 12/28/2022] Open
Abstract
Herpes simplex virus 1 (HSV-1) uses latency in peripheral ganglia to persist in its human host, however, recurrent reactivation from this reservoir can cause debilitating and potentially life-threatening disease. Most studies of latency use live-animal infection models, but these are complex, multilayered systems and can be difficult to manipulate. Infection of cultured primary neurons provides a powerful alternative, yielding important insights into host signaling pathways controlling latency. However, small animal models do not recapitulate all aspects of HSV-1 infection in humans and are limited in terms of the available molecular tools. To address this, we have developed a latency model based on human neurons differentiated in culture from an NIH-approved embryonic stem cell line. The resulting neurons are highly permissive for replication of wild-type HSV-1, but establish a non-productive infection state resembling latency when infected at low viral doses in the presence of the antivirals acyclovir and interferon-α. In this state, viral replication and expression of a late viral gene marker are not detected but there is an accumulation of the viral latency-associated transcript (LAT) RNA. After a six-day establishment period, antivirals can be removed and the infected cultures maintained for several weeks. Subsequent treatment with sodium butyrate induces reactivation and production of new infectious virus. Human neurons derived from stem cells provide the appropriate species context to study this exclusively human virus with the potential for more extensive manipulation of the progenitors and access to a wide range of preexisting molecular tools.
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Affiliation(s)
- Aldo Pourchet
- Department of Microbiology, New York University School of Medicine, New York, NY 10016, USA.
| | - Aram S Modrek
- Department of Neurosurgery, New York University School of Medicine, New York, NY 10016, USA.
| | - Dimitris G Placantonakis
- Department of Neurosurgery, New York University School of Medicine, New York, NY 10016, USA.
- Kimmel Center for Stem Cell Biology, New York University School of Medicine, New York, NY 10016, USA.
- Brain Tumor Center, New York University School of Medicine, New York, NY 10016, USA.
- Perlmutter Cancer Center, New York University School of Medicine, New York, NY 10016, USA.
- Neuroscience Institute, New York University School of Medicine, New York, NY 10016, USA.
| | - Ian Mohr
- Department of Microbiology, New York University School of Medicine, New York, NY 10016, USA.
- Perlmutter Cancer Center, New York University School of Medicine, New York, NY 10016, USA.
| | - Angus C Wilson
- Department of Microbiology, New York University School of Medicine, New York, NY 10016, USA.
- Perlmutter Cancer Center, New York University School of Medicine, New York, NY 10016, USA.
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Khan AA, Srivastava R, Chentoufi AA, Kritzer E, Chilukuri S, Garg S, Yu DC, Vahed H, Huang L, Syed SA, Furness JN, Tran TT, Anthony NB, McLaren CE, Sidney J, Sette A, Noelle RJ, BenMohamed L. Bolstering the Number and Function of HSV-1-Specific CD8 + Effector Memory T Cells and Tissue-Resident Memory T Cells in Latently Infected Trigeminal Ganglia Reduces Recurrent Ocular Herpes Infection and Disease. THE JOURNAL OF IMMUNOLOGY 2017; 199:186-203. [PMID: 28539429 DOI: 10.4049/jimmunol.1700145] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 04/21/2017] [Indexed: 01/09/2023]
Abstract
HSV type 1 (HSV-1) is a prevalent human pathogen that infects >3.72 billion individuals worldwide and can cause potentially blinding recurrent corneal herpetic disease. HSV-1 establishes latency within sensory neurons of trigeminal ganglia (TG), and TG-resident CD8+ T cells play a critical role in preventing its reactivation. The repertoire, phenotype, and function of protective CD8+ T cells are unknown. Bolstering the apparent feeble numbers of CD8+ T cells in TG remains a challenge for immunotherapeutic strategies. In this study, a comprehensive panel of 467 HLA-A*0201-restricted CD8+ T cell epitopes was predicted from the entire HSV-1 genome. CD8+ T cell responses to these genome-wide epitopes were compared in HSV-1-seropositive symptomatic individuals (with a history of numerous episodes of recurrent herpetic disease) and asymptomatic (ASYMP) individuals (who are infected but never experienced any recurrent herpetic disease). Frequent polyfunctional HSV-specific IFN-γ+CD107a/b+CD44highCD62LlowCD8+ effector memory T cells were detected in ASYMP individuals and were primarily directed against three "ASYMP" epitopes. In contrast, symptomatic individuals have more monofunctional CD44highCD62LhighCD8+ central memory T cells. Furthermore, therapeutic immunization with an innovative prime/pull vaccine, based on priming with multiple ASYMP epitopes (prime) and neurotropic TG delivery of the T cell-attracting chemokine CXCL10 (pull), boosted the number and function of CD44highCD62LlowCD8+ effector memory T cells and CD103highCD8+ tissue-resident T cells in TG of latently infected HLA-A*0201-transgenic mice and reduced recurrent ocular herpes following UV-B-induced reactivation. These findings have profound implications in the development of T cell-based immunotherapeutic strategies to treat blinding recurrent herpes infection and disease.
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Affiliation(s)
- Arif A Khan
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Ruchi Srivastava
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Aziz A Chentoufi
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Elizabeth Kritzer
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Sravya Chilukuri
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Sumit Garg
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - David C Yu
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Hawa Vahed
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Lei Huang
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Sabrina A Syed
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Julie N Furness
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Tien T Tran
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Nesburn B Anthony
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697
| | - Christine E McLaren
- Department of Epidemiology, University of California, Irvine, Irvine, CA 92697
| | - John Sidney
- Department of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, CA 92037
| | - Alessandro Sette
- Department of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, CA 92037
| | - Randolph J Noelle
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, NH 03755
| | - Lbachir BenMohamed
- Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, University of California, Irvine, School of Medicine, Irvine, CA 92697; .,Department of Molecular Biology and Biochemistry, University of California, Irvine, School of Medicine, Irvine, CA 92697; and.,Institute for Immunology, University of California, Irvine, School of Medicine, Irvine, CA 92697
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38
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Interrelationship of Primary Virus Replication, Level of Latency, and Time to Reactivation in the Trigeminal Ganglia of Latently Infected Mice. J Virol 2016; 90:9533-42. [PMID: 27512072 DOI: 10.1128/jvi.01373-16] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 08/04/2016] [Indexed: 01/13/2023] Open
Abstract
UNLABELLED We sought to determine the possibility of an interrelationship between primary virus replication in the eye, the level of viral DNA in the trigeminal ganglia (TG) during latency, and the amount of virus reactivation following ocular herpes simplex virus type 1 (HSV-1) infection. Mice were infected with virulent (McKrae) or avirulent (KOS and RE) strains of HSV-1, and virus titers in the eyes and TG during primary infection, level of viral gB DNA in TG on day 28 postinfection (p.i.), and virus reactivation on day 28 p.i. as measured by explant reactivation were calculated. Our results suggest that the avirulent strains of HSV-1, even after corneal scarification, had lower virus titers in the eye, had less latency in the TG, and took a longer time to reactivate than virulent strains of HSV-1. The time to explant reactivation of avirulent strains of HSV-1 was similar to that of the virulent LAT((-)) McKrae-derived mutant. The viral dose with the McKrae strain of HSV-1 affected the level of viral DNA and time to explant reactivation. Overall, our results suggest that there is no absolute correlation between primary virus titer in the eye and TG and the level of viral DNA in latent TG and time to reactivation. IMPORTANCE Very little is known regarding the interrelationship between primary virus replication in the eye, the level of latency in TG, and the time to reactivate in the mouse model. This study was designed to answer these questions. Our results point to the absence of any correlation between the level of primary virus replication and the level of viral DNA during latency, and neither was an indicator of how rapidly the virus reactivated following explant TG-induced reactivation.
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Song B, Liu X, Wang Q, Zhang R, Yang T, Han Z, Xu Y. Adenovirus-mediated shRNA interference against HSV-1 replication in vitro. J Neurovirol 2016; 22:799-807. [PMID: 27566181 DOI: 10.1007/s13365-016-0453-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 04/06/2016] [Accepted: 05/02/2016] [Indexed: 01/07/2023]
Abstract
The UL29 and UL28 proteins encoded by herpes simplex virus type 1 (HSV-1) are critical for its replication and packaging, respectively. Research has demonstrated that synthesized siRNA molecules targeting the UL29 gene are able to suppress HSV-2 replication and the UL28-null HSV-1 gene cannot form infectious viruses in vitro. Silencing the UL28 and UL29 genes by RNAi might lead to the development of novel antiviral agents for the treatment of HSV-1 infections. Two kinds of short hairpin RNAs (shRNAs) targeting the UL29 and UL28 genes were chemically synthesized and then delivered into cells by a replication-defective human adenovirus type 5 (Adv5) vector. (-) shRNAs targeting none of the genome of HSV-1 were used as the control. Vero cells were inoculated with Ad-UL28shRNA or Ad-UL29shRNA at a multiplicity of infection (MOI) of 100 and challenged 24 h later with HSV-1 at an MOI of 0.01 to inhibit HSV-1 replication, as measured by the level of the corresponding RNA and proteins. In addition, the amount of progeny virus was assessed at daily intervals. The antiviral effects of Ad-shRNAs at ongoing HSV-1 infection were explored at 12 h after inoculation of the HSV-1. The results showed that the shRNAs delivered by Adv5 significantly suppressed HSV-1 replication in vitro, as determined by the levels of viral RNA transcription, viral protein synthesis, and viral production. The Ad-UL28shRNA and Ad-UL29shRNA suppressed the replication of HSV-1, respectively, compared with the control group (P < 0.001). When Ad-UL28shRNA and Ad-UL29shRNA were combined, a synergistic effect was observed. The antiviral effects could sustain for at least 4 days after the HSV-1 infection (P < 0.001). Furthermore, antiviral effects were achieved 12 h prior to inoculation of Adv5-shRNAs (P < 0.001). Our data demonstrated comparable antiviral activities against herpes simplex virus by shRNAs targeting either UL29 or UL28 sites in vitro and the effectiveness of using the Adv5 delivery of shRNAs. Therefore, the Adv5 delivery of shRNAs targeting the UL29 and UL28 sites probably may provide an alternative strategy for controlling HSV-1 infection.
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Affiliation(s)
- Bo Song
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Xinjing Liu
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Qingzhi Wang
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Rui Zhang
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Ting Yang
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Zhiqiang Han
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China
| | - Yuming Xu
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, China.
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40
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He J, Cosby R, Hill JM, Bazan HEP. Changes in Corneal Innervation after HSV-1 Latency Established with Different Reactivation Phenotypes. Curr Eye Res 2016; 42:181-186. [PMID: 27315102 DOI: 10.3109/02713683.2016.1167919] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE OF THE STUDY We used a rabbit model infected with high phenotypic reactivators (HPRs) as well as recombinant HSV-1 (herpes simplex virus 1) with deletions to study their effect on corneal innervations after latency was established. MATERIALS AND METHODS Corneas from noninfected New Zealand white rabbits were used to obtain the entire map of corneal innervation. Others were inoculated with the HSV-1 strains McKrae, 17Syn+, or recombinant mutants with glycoprotein K (gK) deletion, or with infected early protein 0 (ICP0) deletion. The animals were euthanized at 124 to 125 days postinfection and the corneas were immunostained with a mouse monoclonal anti-βIII tubulin antibody. Images were acquired with a fluorescence microscope and corneal sub-basal nerve density was calculated on the basis of the whole mount images. Differences between the HSV-infected eyes, and comparison with normal control, were analyzed. RESULTS In the noninfected rabbit, the stroma was densely innervated in the central area and as a consequence the sub-basal epithelial nerve bundles were shorter, and no vortex was found. The HSV-infected corneas showed nerve damage in both epithelial and stromal nerves. Corneas infected with ICP0 and gK deletion mutants showed mild to moderate damage, while those infected with 17Syn+ and McKrae strains were seriously damaged. In the eyes infected with ICP0 and gK deletion, there were reduced numbers of sub-basal nerve bundles, but most of the corneas retained a normal stromal network. Corneas infected with 17 Syn+ and McKrae displayed destroyed nerve structures and formation of a scar tissue in the central cornea, in which only a few nerve fibers could be detected. CONCLUSION HSV-1 primary corneal infection seriously damages the corneal nerves, persisting for more than 4 months. Reduction of axonal transport (by gK deletion) or virus replication (by ICP0 deletion) significantly attenuated the nerve damage induced by the virus.
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Affiliation(s)
- Jiucheng He
- a Neuroscience Center of Excellence, Louisiana State University Health, School of Medicine , New Orleans , Louisiana , USA.,b Department of Ophthalmology , Louisiana State University Health, School of Medicine , New Orleans , Louisiana , USA
| | - Richard Cosby
- b Department of Ophthalmology , Louisiana State University Health, School of Medicine , New Orleans , Louisiana , USA
| | - James M Hill
- a Neuroscience Center of Excellence, Louisiana State University Health, School of Medicine , New Orleans , Louisiana , USA.,b Department of Ophthalmology , Louisiana State University Health, School of Medicine , New Orleans , Louisiana , USA
| | - Haydee E P Bazan
- a Neuroscience Center of Excellence, Louisiana State University Health, School of Medicine , New Orleans , Louisiana , USA.,b Department of Ophthalmology , Louisiana State University Health, School of Medicine , New Orleans , Louisiana , USA
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Mott KR, Gate D, Matundan HH, Ghiasi YN, Town T, Ghiasi H. CD8+ T Cells Play a Bystander Role in Mice Latently Infected with Herpes Simplex Virus 1. J Virol 2016; 90:5059-5067. [PMID: 26962220 PMCID: PMC4859724 DOI: 10.1128/jvi.00255-16] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 03/01/2016] [Indexed: 02/05/2023] Open
Abstract
UNLABELLED Based on an explant reactivation model, it has been proposed that CD8(+) T cells maintain latency in trigeminal ganglia (TG) of mice latently infected with herpes simplex virus 1 (HSV-1) [T. Liu, K. M. Khanna, X. Chen, D. J. Fink, and R. L. Hendricks, J Exp Med 191:1459-1466, 2000, doi:10.1084/jem.191.9.1459; K. M. Khanna, R. H. Bonneau, P. R. Kinchington, and R. L. Hendricks, Immunity 18:593-603, 2003, doi:10.1016/S1074-7613(03)00112-2]. In those studies, BALB/c mice were ocularly infected with an avirulent HSV-1 strain (RE) after corneal scarification. However, in our studies, we typically infect mice with a virulent HSV-1 strain (McKrae) that does not require corneal scarification. Using a combination of knockout mice, adoptive transfers, and depletion studies, we recently found that CD8α(+) dendritic cells (DCs) contribute to HSV-1 latency and reactivation in TG of ocularly infected mice (K. R. Mott, S. J. Allen, M. Zandian, B. Konda, B. G. Sharifi, C. Jones, S. L. Wechsler, T. Town, and H. Ghiasi, PLoS One 9:e93444, 2014, doi:10.1371/journal.pone.0093444). This suggested that CD8(+) T cells might not be the major regulators of HSV-1 latency in the mouse TG. To investigate this iconoclastic possibility, we used a blocking CD8 antibody and CD8(+) T cells in reactivated TG explants from mice latently infected with (i) the avirulent HSV-1 strain RE following corneal scarification or (ii) the virulent HSV-1 strain McKrae without corneal scarification. Independently of the strain or approach, our results show that CD8α(+) DCs, not CD8(+) T cells, drive latency and reactivation. In addition, adoptive transfer of CD8(+) T cells from wild-type (wt) mice to CD8α(-/-) mice did not restore latency to the level for wt mice or wt virus. In the presence of latency-associated transcript (LAT((+)); wt virus), CD8(+) T cells seem to play a bystander role in the TG. These bystander T cells highly express PD-1, most likely due to the presence of CD8α(+) DCs. Collectively, these results support the notion that CD8(+) T cells do not play a major role in maintaining HSV-1 latency and reactivation. SIGNIFICANCE This study addresses a fundamentally important and widely debated issue in the field of HSV latency-reactivation. In this article, we directly compare the effects of anti-CD8 antibody, CD8(+) T cells, LAT, and CD8α(+) DCs in blocking explant reactivation in TG of mice latently infected with avirulent or virulent HSV-1. Our data suggest that CD8(+) T cells are not responsible for an increase or maintenance of latency in ocularly infected mice. However, they seem to play a bystander role that correlates with the presence of LAT, higher subclinical reactivation levels, and higher PD-1 expression levels.
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Affiliation(s)
- Kevin R Mott
- Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - David Gate
- Zilkha Neurogenetic Institute, Department of Physiology & Biophysics, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Harry H Matundan
- Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Yasamin N Ghiasi
- Zilkha Neurogenetic Institute, Department of Physiology & Biophysics, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Terrence Town
- Zilkha Neurogenetic Institute, Department of Physiology & Biophysics, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Homayon Ghiasi
- Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Medical Center, Los Angeles, California, USA
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42
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Cohrs RJ, Badani H, Bos N, Scianna C, Hoskins I, Baird NL, Gilden D. Alphaherpesvirus DNA replication in dissociated human trigeminal ganglia. J Neurovirol 2016; 22:688-694. [PMID: 27173396 DOI: 10.1007/s13365-016-0450-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 04/25/2016] [Accepted: 05/02/2016] [Indexed: 01/08/2023]
Abstract
Analysis of the frequency and PCR-quantifiable abundance of herpes simplex virus type 1 (HSV-1) and varicella zoster virus (VZV) DNA in multiple biological replicates of cells from dissociated randomly distributed human trigeminal ganglia (TG) of four subjects revealed an increase in both parameters and in both viruses during 5 days of culture, with no further change by 10 days. Dissociated TG provides a platform to analyze initiation of latent virus DNA replication within 5 days of culture.
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Affiliation(s)
- Randall J Cohrs
- Department of Neurology, University of Colorado School of Medicine, 12700 E. 19th Avenue, Mail Stop B182, Aurora, CO, 80045, USA.
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO, 80045, USA.
| | - Hussain Badani
- Department of Neurology, University of Colorado School of Medicine, 12700 E. 19th Avenue, Mail Stop B182, Aurora, CO, 80045, USA
| | - Nathan Bos
- Department of Neurology, University of Colorado School of Medicine, 12700 E. 19th Avenue, Mail Stop B182, Aurora, CO, 80045, USA
| | - Charles Scianna
- Department of Neurology, University of Colorado School of Medicine, 12700 E. 19th Avenue, Mail Stop B182, Aurora, CO, 80045, USA
| | - Ian Hoskins
- Department of Neurology, University of Colorado School of Medicine, 12700 E. 19th Avenue, Mail Stop B182, Aurora, CO, 80045, USA
| | - Nicholas L Baird
- Department of Neurology, University of Colorado School of Medicine, 12700 E. 19th Avenue, Mail Stop B182, Aurora, CO, 80045, USA
| | - Don Gilden
- Department of Neurology, University of Colorado School of Medicine, 12700 E. 19th Avenue, Mail Stop B182, Aurora, CO, 80045, USA
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO, 80045, USA
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The Herpes Simplex Virus Latency-Associated Transcript Gene Is Associated with a Broader Repertoire of Virus-Specific Exhausted CD8+ T Cells Retained within the Trigeminal Ganglia of Latently Infected HLA Transgenic Rabbits. J Virol 2016; 90:3913-3928. [PMID: 26842468 DOI: 10.1128/jvi.02450-15] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 01/21/2016] [Indexed: 02/07/2023] Open
Abstract
UNLABELLED Persistent pathogens, such as herpes simplex virus 1 (HSV-1), have evolved a variety of immune evasion strategies to avoid being detected and destroyed by the host's immune system. A dynamic cross talk appears to occur between the HSV-1 latency-associated transcript (LAT), the only viral gene that is abundantly transcribed during latency, and the CD8(+)T cells that reside in HSV-1 latently infected human and rabbit trigeminal ganglia (TG). The reactivation phenotype of TG that are latently infected with wild-type HSV-1 or with LAT-rescued mutant (i.e., LAT(+)TG) is significantly higher than TG latently infected with LAT-null mutant (i.e., LAT(-)TG). Whether LAT promotes virus reactivation by selectively shaping a unique repertoire of HSV-specific CD8(+)T cells in LAT(+)TG is unknown. In the present study, we assessed the frequency, function, and exhaustion status of TG-resident CD8(+)T cells specific to 40 epitopes derived from HSV-1 gB, gD, VP11/12, and VP13/14 proteins, in human leukocyte antigen (HLA-A*0201) transgenic rabbits infected ocularly with LAT(+)versus LAT(-)virus. Compared to CD8(+)T cells from LAT(-)TG, CD8(+)T cells from LAT(+)TG (i) recognized a broader selection of nonoverlapping HSV-1 epitopes, (ii) expressed higher levels of PD-1, TIM-3, and CTLA-4 markers of exhaustion, and (iii) produced less tumor necrosis factor alpha, gamma interferon, and granzyme B. These results suggest a novel immune evasion mechanism by which the HSV-1 LAT may contribute to the shaping of a broader repertoire of exhausted HSV-specific CD8(+)T cells in latently infected TG, thus allowing for increased viral reactivation. IMPORTANCE A significantly larger repertoire of dysfunctional (exhausted) HSV-specific CD8(+)T cells were found in the TG of HLA transgenic rabbits latently infected with wild-type HSV-1 or with LAT-rescued mutant (i.e., LAT(+)TG) than in a more restricted repertoire of functional HSV-specific CD8(+)T cells in the TG of HLA transgenic rabbits latently infected with LAT-null mutant (i.e., LAT(-)TG). These findings suggest that the HSV-1 LAT locus interferes with the host cellular immune response by shaping a broader repertoire of exhausted HSV-specific CD8(+)T cells within the latency/reactivation TG site.
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Nicoli F, Gallerani E, Skarlis C, Sicurella M, Cafaro A, Ensoli B, Caputo A, Marconi PC, Gavioli R. Systemic immunodominant CD8 responses with an effector-like phenotype are induced by intravaginal immunization with attenuated HSV vectors expressing HIV Tat and mediate protection against HSV infection. Vaccine 2016; 34:2216-24. [PMID: 27002499 DOI: 10.1016/j.vaccine.2016.03.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 01/26/2016] [Accepted: 03/09/2016] [Indexed: 01/01/2023]
Abstract
Mucosal HSV infection remains a public health issue in developing and developed world. However, an effective vaccine is still missing, partly because of the incomplete knowledge of correlates of protection. In this study we have investigated the kinetics and quality of immunity elicited by an attenuated HSV1 vector expressing the immunomodulatory Tat protein of HIV-1 (HSV1-Tat). Animals were immunized by intravaginal (IVag) or intradermal (ID) route with HSV1-Tat or with a control HSV1 vector expressing the LacZ gene (HSV1-LacZ) and immune responses were characterized in different anatomical districts. IVag immunization with HSV1-Tat enhanced both expansion and memory phases of HSV-specific immunodominant CD8 responses at systemic, but not local, level and induced short- and long-term protection against mucosal challenge. Conversely, ID immunization with HSV1-Tat favored HSV-subdominant CD8 responses, which protected mice only at early time points after immunization. IVag immunization, in particular with HSV1-Tat, compared to ID immunization, induced the differentiation of CD8(+) T lymphocytes into short-lived effector (SLEC) and effector memory (Tem) cells, generating more robust recall responses associated with increased control of virus replication. Notably, systemic SLEC and Tem contributed to generate protective local secondary responses, demonstrating their importance for mucosal control of HSV. Finally, IgG responses were observed mostly in IVag HSV1-Tat immunized animals, although seemed dispensable for protection, which occurred even in few IgG negative mice. Thus, HSV1 vectors expressing Tat induce protective anti-HSV1 immune responses.
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Affiliation(s)
- Francesco Nicoli
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Eleonora Gallerani
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Charalampos Skarlis
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Mariaconcetta Sicurella
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy; Medical Genetics Unit, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Aurelio Cafaro
- National AIDS Center, Istituto Superiore di Sanità, Roma, Italy
| | - Barbara Ensoli
- National AIDS Center, Istituto Superiore di Sanità, Roma, Italy
| | - Antonella Caputo
- Department of Molecular Medicine, University of Padova, Padova, Italy
| | - Peggy C Marconi
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Riccardo Gavioli
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy.
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Abstract
Alphaherpesviruses infect a variety of species from sea turtles to man and can cause significant disease in mammals including humans and livestock. These viruses are characterized by a lytic and latent state in nerve ganglia, with the ability to establish a lifelong latent infection that is interrupted by periodic reactivation. Previously, it was accepted that latency was a dominant state and that only during relatively infrequent reactivation episodes did latent genomes within ganglia become transcriptionally active. Here, we review recent data, focusing mainly on Herpes Simplex Virus type 1 which indicate that the latent state is more dynamic than recently appreciated.
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Affiliation(s)
- David C Bloom
- Department of Molecular Genetics & Microbiology, University of Florida College of Medicine, Gainesville, Florida, USA.
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46
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Abrisch RG, Eidem TM, Yakovchuk P, Kugel JF, Goodrich JA. Infection by Herpes Simplex Virus 1 Causes Near-Complete Loss of RNA Polymerase II Occupancy on the Host Cell Genome. J Virol 2015; 90:2503-13. [PMID: 26676778 PMCID: PMC4810688 DOI: 10.1128/jvi.02665-15] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 12/10/2015] [Indexed: 12/31/2022] Open
Abstract
UNLABELLED Lytic infection by herpes simplex virus 1 (HSV-1) triggers a change in many host cell programs as the virus strives to express its own genes and replicate. Part of this process is repression of host cell transcription by RNA polymerase II (Pol II), which also transcribes the viral genome. Here, we describe a global characterization of Pol II occupancy on the viral and host genomes in response to HSV-1 infection using chromatin immunoprecipitation followed by deep sequencing (ChIP-seq). The data reveal near-complete loss of Pol II occupancy throughout host cell mRNA genes, in both their bodies and promoter-proximal regions. Increases in Pol II occupancy of host cell genes, which would be consistent with robust transcriptional activation, were not observed. HSV-1 infection induced a more potent and widespread repression of Pol II occupancy than did heat shock, another cellular stress that widely represses transcription. Concomitant with the loss of host genome Pol II occupancy, we observed Pol II covering the HSV-1 genome, reflecting a high level of viral gene transcription. Interestingly, the positions of the peaks of Pol II occupancy at HSV-1 and host cell promoters were different. IMPORTANCE We investigated the effect of herpes simplex virus 1 (HSV-1) infection on transcription of host cell and viral genes by RNA polymerase II (Pol II). The approach we used was to determine how levels of genome-bound Pol II changed after HSV-1 infection. We found that HSV-1 caused a profound loss of Pol II occupancy across the host cell genome. Increases in Pol II occupancy were not observed, showing that no host genes were activated after infection. In contrast, Pol II occupied the entire HSV-1 genome. Moreover, the pattern of Pol II at HSV-1 genes differed from that on host cell genes, suggesting a unique mode of viral gene transcription. These studies provide new insight into how HSV-1 causes changes in the cellular program of gene expression and how the virus coopts host Pol II for its own use.
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Affiliation(s)
- Robert G Abrisch
- University of Colorado, Department of Chemistry and Biochemistry, Boulder, Colorado, USA
| | - Tess M Eidem
- University of Colorado, Department of Chemistry and Biochemistry, Boulder, Colorado, USA
| | - Petro Yakovchuk
- University of Colorado, Department of Chemistry and Biochemistry, Boulder, Colorado, USA
| | - Jennifer F Kugel
- University of Colorado, Department of Chemistry and Biochemistry, Boulder, Colorado, USA
| | - James A Goodrich
- University of Colorado, Department of Chemistry and Biochemistry, Boulder, Colorado, USA
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Peng X, Knouse JA, Hernon KM. Rabbit Models for Studying Human Infectious Diseases. Comp Med 2015; 65:499-507. [PMID: 26678367 PMCID: PMC4681244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/03/2015] [Accepted: 06/28/2015] [Indexed: 06/05/2023]
Abstract
Using an appropriate animal model is crucial for mimicking human disease conditions, and various facets including genetics, anatomy, and pathophysiology should be considered before selecting a model. Rabbits (Oryctolagus cuniculus) are well known for their wide use in production of antibodies, eye research, atherosclerosis and other cardiovascular diseases. However, a systematic description of the rabbit as primary experimental models for the study of various human infectious diseases is unavailable. This review focuses on the human infectious diseases for which rabbits are considered a classic or highly appropriate model, including AIDS (caused by HIV1), adult T-cell leukemia-lymphoma (human T-lymphotropic virus type 1), papilloma or carcinoma (human papillomavirus) , herpetic stromal keratitis (herpes simplex virus type 1), tuberculosis (Mycobacterium tuberculosis), and syphilis (Treponema pallidum). In addition, particular aspects of the husbandry and care of rabbits used in studies of human infectious diseases are described.
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Affiliation(s)
- Xuwen Peng
- Department of Comparative Medicine, College of Medicine, Pennsylvania State University, Hershey, Pennsylvania, USA.
| | - John A Knouse
- Department of Comparative Medicine, College of Medicine, Pennsylvania State University, Hershey, Pennsylvania, USA
| | - Krista M Hernon
- Department of Comparative Medicine, College of Medicine, Pennsylvania State University, Hershey, Pennsylvania, USA
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Herpes Simplex Virus 1 Infection of Tree Shrews Differs from That of Mice in the Severity of Acute Infection and Viral Transcription in the Peripheral Nervous System. J Virol 2015; 90:790-804. [PMID: 26512084 DOI: 10.1128/jvi.02258-15] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Accepted: 10/19/2015] [Indexed: 01/01/2023] Open
Abstract
UNLABELLED Studies of herpes simplex virus (HSV) infections of humans are limited by the use of rodent models such as mice, rabbits, and guinea pigs. Tree shrews (Tupaia belangeri chinensis) are small mammals indigenous to southwest Asia. At behavioral, anatomical, genomic, and evolutionary levels, tree shrews are much closer to primates than rodents are, and tree shrews are susceptible to HSV infection. Thus, we have studied herpes simplex virus 1 (HSV-1) infection in the tree shrew trigeminal ganglion (TG) following ocular inoculation. In situ hybridization, PCR, and quantitative reverse transcription-PCR (qRT-PCR) analyses confirm that HSV-1 latently infects neurons of the TG. When explant cocultivation of trigeminal ganglia was performed, the virus was recovered after 5 days of cocultivation with high efficiency. Swabbing the corneas of latently infected tree shrews revealed that tree shrews shed virus spontaneously at low frequencies. However, tree shrews differ significantly from mice in the expression of key HSV-1 genes, including ICP0, ICP4, and latency-associated transcript (LAT). In acutely infected tree shrew TGs, no level of ICP4 was observed, suggesting the absence of infection or a very weak, acute infection compared to that of the mouse. Immunofluorescence staining with ICP4 monoclonal antibody, and immunohistochemistry detection by HSV-1 polyclonal antibodies, showed a lack of viral proteins in tree shrew TGs during both acute and latent phases of infection. Cultivation of supernatant from homogenized, acutely infected TGs with RS1 cells also exhibited an absence of infectious HSV-1 from tree shrew TGs. We conclude that the tree shrew has an undetectable, or a much weaker, acute infection in the TGs. Interestingly, compared to mice, tree shrew TGs express high levels of ICP0 transcript in addition to LAT during latency. However, the ICP0 transcript remained nuclear, and no ICP0 protein could be seen during the course of mouse and tree shrew TG infections. Taken together, these observations suggest that the tree shrew TG infection differs significantly from the existing rodent models. IMPORTANCE Herpes simplex viruses (HSVs) establish lifelong infection in more than 80% of the human population, and their reactivation leads to oral and genital herpes. Currently, rodent models are the preferred models for latency studies. Rodents are distant from primates and may not fully represent human latency. The tree shrew is a small mammal, a prosimian primate, indigenous to southwest Asia. In an attempt to further develop the tree shrew as a useful model to study herpesvirus infection, we studied the establishment of latency and reactivation of HSV-1 in tree shrews following ocular inoculation. We found that the latent virus, which resides in the sensory neurons of the trigeminal ganglion, could be stress reactivated to produce infectious virus, following explant cocultivation and that spontaneous reactivation could be detected by cell culture of tears. Interestingly, the tree shrew model is quite different from the mouse model of HSV infection, in that the virus exhibited only a mild acute infection following inoculation with no detectable infectious virus from the sensory neurons. The mild infection may be more similar to human infection in that the sensory neurons continue to function after herpes reactivation and the affected skin tissue does not lose sensation. Our findings suggest that the tree shrew is a viable model to study HSV latency.
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Reactivation of HSV-1 following explant of tree shrew brain. J Neurovirol 2015; 22:293-306. [PMID: 26501779 PMCID: PMC4899501 DOI: 10.1007/s13365-015-0393-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 08/27/2015] [Accepted: 10/07/2015] [Indexed: 11/23/2022]
Abstract
Herpes Simplex Virus type I (HSV-1) latently infects peripheral nervous system (PNS) sensory neurons, and its reactivation leads to recurring cold sores. The reactivated HSV-1 can travel retrograde from the PNS into the central nervous system (CNS) and is known to be causative of Herpes Simplex viral encephalitis. HSV-1 infection in the PNS is well documented, but little is known on the fate of HSV-1 once it enters the CNS. In the murine model, HSV-1 genome persists in the CNS once infected through an ocular route. To gain more details of HSV-1 infection in the CNS, we characterized HSV-1 infection of the tree shrew (Tupaia belangeri chinensis) brain following ocular inoculation. Here, we report that HSV-1 enters the tree shrew brain following ocular inoculation and HSV-1 transcripts, ICP0, ICP4, and LAT can be detected at 5 days post-infection (p.i.), peaking at 10 days p.i. After 2 weeks, ICP4 and ICP0 transcripts are reduced to a basal level, but the LAT intron region continues to be expressed. Live virus could be recovered from the olfactory bulb and brain stem tissue. Viral proteins could be detected using anti-HSV-1 antibodies and anti-ICP4 antibody, during the acute stage but not beyond. In situ hybridization could detect LAT during acute infection in most brain regions and in olfactory bulb and brain stem tissue well beyond the acute stage. Using a homogenate from these tissues’ post-acute infection, we did not recover live HSV-1 virus, supporting a latent infection, but using a modified explant cocultivation technique, we were able to recover reactivated virus from these tissues, suggesting that the HSV-1 virus latently infects the tree shrew CNS. Compared to mouse, the CNS acute infection of the tree shrew is delayed and the olfactory bulb contains most latent virus. During the acute stage, a portion of the infected tree shrews exhibit symptoms similar to human viral encephalitis. These findings, together with the fact that tree shrews are closely related to primates, provided a valuable alternative model to study HSV-1 infection and pathogenesis in the CNS.
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50
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BenMohamed L, Osorio N, Khan AA, Srivastava R, Huang L, Krochmal JJ, Garcia JM, Simpson JL, Wechsler SL. Prior Corneal Scarification and Injection of Immune Serum are Not Required Before Ocular HSV-1 Infection for UV-B-Induced Virus Reactivation and Recurrent Herpetic Corneal Disease in Latently Infected Mice. Curr Eye Res 2015; 41:747-56. [PMID: 26398722 DOI: 10.3109/02713683.2015.1061024] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE Blinding ocular herpetic disease in humans is due to spontaneous reactivation of herpes simplex virus type 1 (HSV-1) from latency, rather than to primary acute infection. Mice latently infected with HSV-1 undergo little or no in vivo spontaneous reactivation with accompanying virus shedding in tears. HSV-1 reactivation can be induced in latently infected mice by several in vivo procedures, with UV-B-induced reactivation being one commonly used method. In the UV-B model, corneas are scarified (lightly scratched) just prior to ocular infection to increase efficiency of the primary infection and immune serum containing HSV-1 neutralizing antibodies is injected intraperitoneally (i.p.) to increase survival and decrease acute corneal damage. Since scarification can significantly alter host gene transcription in the cornea and in the trigeminal ganglia (TG; the site of HSV-1 latency) and since injection of immune serum likely modulates innate and adaptive herpes immunity, we investigated eliminating both treatments. MATERIAL AND METHODS Mice were infected with HSV-1 with or without corneal scarification and immune serum. HSV-1 reactivation and recurrent disease were induced by UV-B irradiation. RESULTS When corneal scarification and immune serum were both eliminated, UV-B irradiation still induced both HSV-1 reactivation, as measured by shedding of reactivated virus in tears and herpetic eye disease, albeit at reduced levels compared to the original procedure. CONCLUSION Despite the reduced reactivation and disease, avoidance of both corneal scarification and immune serum should improve the clinical relevance of the UV-B mouse model.
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Affiliation(s)
- Lbachir BenMohamed
- a Laboratory of Cellular and Molecular Immunology , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA .,b Department of Molecular Biology & Biochemistry, School of Medicine , University of California Irvine , Irvine , CA , USA .,c School of Medicine, Institute for Immunology, University of California Irvine , Irvine , CA , USA
| | - Nelson Osorio
- d Department of Ophthalmology, Virology Research , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA
| | - Arif A Khan
- a Laboratory of Cellular and Molecular Immunology , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA
| | - Ruchi Srivastava
- a Laboratory of Cellular and Molecular Immunology , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA
| | - Lei Huang
- a Laboratory of Cellular and Molecular Immunology , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA
| | - John J Krochmal
- d Department of Ophthalmology, Virology Research , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA
| | - Jairo M Garcia
- d Department of Ophthalmology, Virology Research , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA
| | - Jennifer L Simpson
- e Department of Ophthalmology , School of Medicine, Gavin Herbert Eye Institute, University of California Irvine , Irvine , CA , USA
| | - Steven L Wechsler
- d Department of Ophthalmology, Virology Research , Gavin Herbert Eye Institute, University of California Irvine, School of Medicine , Irvine , CA , USA .,f Department of Microbiology and Molecular Genetics , School of Medicine, University of California Irvine , Irvine , CA , USA and.,g Center for Virus Research, University of California Irvine , Irvine , CA , USA
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