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Zarate S, Bertram MR, Rodgers C, Reed K, Pelzel-McCluskey A, Gomez-Romero N, Rodriguez LL, Mayo C, Mire C, Pond SLK, Velazquez-Salinas L. Phylogenomic Signatures of a Lineage of Vesicular Stomatitis Indiana Virus Circulating During the 2019-2020 Epidemic in the United States. Viruses 2024; 16:1803. [PMID: 39599917 PMCID: PMC11598840 DOI: 10.3390/v16111803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2024] [Revised: 11/14/2024] [Accepted: 11/15/2024] [Indexed: 11/29/2024] Open
Abstract
For the first time, we describe phylogenomic signatures of an epidemic lineage of vesicular stomatitis Indiana virus (VSIV). We applied multiple evolutionary analyses to a dataset of 87 full-length genome sequences representing the circulation of an epidemic VSIV lineage in the US between 2019 and 2020. Based on phylogenetic analyses, we predicted the ancestral relationship of this lineage with a specific group of isolates circulating in the endemic zone of Chiapas, Mexico. Subsequently, our findings indicate that the lineage diversified into at least four different subpopulations during its circulation in the US. We identified single nucleotide polymorphisms (SNPs) that differentiate viral subpopulations and assessed their potential relevance using comparative phylogenetic methods, highlighting the preponderance of synonymous mutations during the differentiation of these populations. Purifying selection was the main evolutionary force favoring the conservation of this epidemic phenotype, with P and G genes as the main drivers of the evolution of this lineage. Our analyses identified multiple codon sites under positive selection and the association of these sites with specific functional domains at P, M, G, and L proteins. Based on ancestral reconstruction analyses, we showed the potential relevance of some of the sites identified under positive selection to the adaptation of the epidemic lineage at the population level. Finally, using a representative group of viruses from Colorado, we established a positive correlation between genetic and geographical distances, suggesting that positive selection on specific codon positions might have favored the adaptation of different subpopulations to circulation in specific geographical settings. Collectively, our study reveals the complex dynamics that accompany the evolution of an epidemic lineage of VSIV in nature. Our analytical framework provides a model for conducting future evolutionary analyses. The ultimate goal is to support the implementation of an early warning system for vesicular stomatitis virus in the US, enabling early detection of epidemic precursors from Mexico.
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Affiliation(s)
- Selene Zarate
- Posgrado en Ciencias Genómicas, Universidad Autónoma de la Ciudad de Mexico, Ciudad de Mexico 03100, Mexico
| | - Miranda R. Bertram
- National Bio-and Agro-defense Facility, Agricultural Research Services, United States Department of Agriculture, Manhattan, KS 66506, USA; (M.R.B.); (L.L.R.); (C.M.)
| | - Case Rodgers
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA; (C.R.); (K.R.); (C.M.)
| | - Kirsten Reed
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA; (C.R.); (K.R.); (C.M.)
| | - Angela Pelzel-McCluskey
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Veterinary Services, Fort Collins, CO 80521, USA;
| | - Ninnet Gomez-Romero
- Departamento de Microbiología e Inmunología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad No. 3000 Col Copilco Universidad, Mexico City 14510, Mexico;
| | - Luis L. Rodriguez
- National Bio-and Agro-defense Facility, Agricultural Research Services, United States Department of Agriculture, Manhattan, KS 66506, USA; (M.R.B.); (L.L.R.); (C.M.)
| | - Christie Mayo
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA; (C.R.); (K.R.); (C.M.)
| | - Chad Mire
- National Bio-and Agro-defense Facility, Agricultural Research Services, United States Department of Agriculture, Manhattan, KS 66506, USA; (M.R.B.); (L.L.R.); (C.M.)
| | - Sergei L. Kosakovsky Pond
- Institute for Genomics and Evolutionary Medicine, Department of Biology, Temple University, Philadelphia, PA 19122, USA
| | - Lauro Velazquez-Salinas
- National Bio-and Agro-defense Facility, Agricultural Research Services, United States Department of Agriculture, Manhattan, KS 66506, USA; (M.R.B.); (L.L.R.); (C.M.)
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Zhou Y, Li Y, Chenm J, Mei K, Kang M, Chen P, Li Q. Matrix Protein of Vesicular Stomatitis Virus Targets the Mitochondria, Reprograms Glucose Metabolism, and Sensitizes to 2-Deoxyglucose in Glioblastoma. Hum Gene Ther 2024; 35:838-854. [PMID: 39001830 PMCID: PMC11511779 DOI: 10.1089/hum.2024.002] [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: 01/08/2024] [Accepted: 07/09/2024] [Indexed: 07/15/2024] Open
Abstract
A potential therapeutic approach for cancer treatment is target oxidative phosphorylation and glycolysis simultaneously. The matrix protein of vesicular stomatitis virus (VSV MP) can target the surface of mitochondria, causing morphological changes that may be associated with mitochondrial dysfunction and oxidative phosphorylation inhibition. Previous research has shown that mitochondrial abnormalities can direct glucose metabolism toward glycolysis. Thus, after treatment with VSV MP, glycolysis inhibition is necessary to completely block glucose metabolism and eradicate cancer. Here, to inhibit glycolysis, the 2-deoxy-D-glucose (2-DG), a synthetic glucose analog was used to combine with VSV MP to treat cancer. This study aims to determine how VSV MP affects the glucose bioenergetic metabolism of cancer cells and to evaluate the synergistic effect of 2-DG when combined with VSV. Our results indicated that in U87 and C6 glioblastoma cell lines, VSV MP caused mitochondrial membrane potential loss, cytochrome c release, and glucose bioenergetics metabolism reprogramming. When combined with 2-DG, VSV MP synergistically aggravated cell viability, apoptosis, and G2/M phase arrest. Meanwhile, the combination therapy exacerbated ATP depletion, activated AMPK, and inhibited mammalian target of rapamycin signaling pathways. In addition, 2-DG treatment alone induced autophagy in glioblastoma cells; however, VSV MP inhibited the autophagy induced by 2-DG in combined treatment and finally contributed to the enhanced cytotoxic effect of the combination strategy in U87 and C6 cancer cells. In the orthotopic U87 glioblastoma model and subcutaneous C6 glioblastoma model, the combined treatment led to significant tumor regression and prolonged survival. A potent therapeutic approach for treating glioblastoma may be found in the combination of VSV MP and glycolytic inhibitors.
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Affiliation(s)
- Yi Zhou
- Department of Abdominal Oncology, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
| | - Yongzhong Li
- Department of Oncology, LuXian People’s Hospital, Luzhou, China
| | - Jing Chenm
- Department of Abdominal Oncology, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
| | - Kai Mei
- Department of Abdominal Oncology, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
| | - Mingxiang Kang
- Department of Oncology, LuXian People’s Hospital, Luzhou, China
| | - Ping Chen
- Department of Abdominal Oncology, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
| | - Qiu Li
- Division of Abdominal Tumor Multimodality Treatment, Department of Medical Oncology, West China Hospital, Cancer Center, Sichuan University, Chengdu, China
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Faria Waziry PA, Raja A, Salmon C, Aldana N, Damodar S, Fukushima AR, Mayi BS. Impact of pyriproxyfen on virus behavior: implications for pesticide-induced virulence and mechanism of transmission. Virol J 2020; 17:93. [PMID: 32631404 PMCID: PMC7339562 DOI: 10.1186/s12985-020-01378-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 06/30/2020] [Indexed: 02/06/2023] Open
Abstract
Background More than 3 years since the last Zika virus (ZIKV) outbreak in Brazil, researchers are still deciphering the molecular mechanisms of neurovirulence and vertical transmission, as well as the best way to control spread of ZIKV, a flavivirus. The use of pesticides was the main strategy of mosquito control during the last ZIKV outbreak. Methods We used vesicular stomatitis virus (VSV) tagged with green fluorescent protein (GFP) as our prototypical virus to study the impact of insecticide pyriproxyfen (PPF). VZV-GFP infected and uninfected Jurkat, HeLa and trophoblast cells were treated with PPF and compared to untreated cells (control). Cell viability was determined by the MTT assay. Cell morphology, presence of extracellular vesicles (EVs), virus infection/GFP expression as well as active mitochondrial levels/localization were examined by confocal microscopy. Results PPF, which was used to control mosquito populations in Brazil prior to the ZIKV outbreak, enhances VSV replication and has cell membrane-altering properties in the presence of virus. PPF causes enhanced viral replication and formation of large EVs, loaded with virus as well as mitochondria. Treatment of trophoblasts or HeLa cells with increasing concentrations of PPF does not alter cell viability, however, it proportionately increases Jurkat cell viability. Increasing concentrations of PPF followed by VSV infection does not interfere with HeLa cell viability. Both Jurkats and trophoblasts show proportionately increased cell death with increased concentrations of PPF in the presence of virus. Conclusions We hypothesize that PPF disrupts the lipid microenvironment of mammalian cells, thereby interfering with pathways of viral replication. PPF lowers viability of trophoblasts and Jurkats in the presence of VSV, implying that the combination renders immune system impairment in infected individuals as well as enhanced vulnerability of fetuses towards viral vertical transmission. We hypothesize that similar viruses such as ZIKV may be vertically transmitted via EV-to-cell contact when exposed to PPF, thereby bypassing immune detection. The impact of pesticides on viral replication must be fully investigated before large scale use in future outbreaks of mosquito borne viruses.
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Affiliation(s)
- Paula A Faria Waziry
- Dr. Kiran C. Patel College of Osteopathic Medicine, Nova Southeastern University, 3400 Gulf to Bay Blvd, Clearwater, FL, 33759, USA
| | - Aarti Raja
- Department of Biological Sciences, Halmos College of Arts and Sciences, Nova Southeastern University, Fort Lauderdale, FL, 33314, USA
| | - Chloe Salmon
- Plymouth University, 3 Endsleigh Place, Drake Circus, Plymouth, England, PL4 8AA
| | - Nathalia Aldana
- Dr. Kiran C. Patel College of Osteopathic Medicine, Nova Southeastern University, 3200 S. University Dr, Fort Lauderdale, FL, 33328, USA
| | - Sruthi Damodar
- Dr. Kiran C. Patel College of Osteopathic Medicine, Nova Southeastern University, 3200 S. University Dr, Fort Lauderdale, FL, 33328, USA
| | - Andre Rinaldi Fukushima
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, Brazil
| | - Bindu S Mayi
- Dr. Kiran C. Patel College of Osteopathic Medicine, Nova Southeastern University, 3400 Gulf to Bay Blvd, Clearwater, FL, 33759, USA.
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Zan J, Liu J, Zhou JW, Wang HL, Mo KK, Yan Y, Xu YB, Liao M, Su S, Hu RL, Zhou JY. Rabies virus matrix protein induces apoptosis by targeting mitochondria. Exp Cell Res 2016; 347:83-94. [PMID: 27426727 DOI: 10.1016/j.yexcr.2016.07.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/12/2016] [Accepted: 07/13/2016] [Indexed: 12/25/2022]
Abstract
Apoptosis, as an innate antiviral defense, not only functions to limit viral replication by eliminating infected cells, but also contribute to viral dissemination, particularly at the late stages of infection. A highly neurotropic CVS strain of rabies virus induces apoptosis both in vitro and in vivo. However, the detailed mechanism of CVS-mediated neuronal apoptosis is not entirely clear. Here, we show that CVS induces apoptosis through mitochondrial pathway by dissipating mitochondrial membrane potential, release of cytochrome c and AIF. CVS blocks Bax activation at the early stages of infection; while M protein partially targets mitochondria and induces mitochondrial apoptosis at the late stages of infection. The α-helix structure spanning 67-79 amino acids of M protein is essential for mitochondrial targeting and induction of apoptosis. These results suggest that CVS functions on mitochondria to regulate apoptosis at different stages of infection, so as to for viral replication and dissemination.
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Affiliation(s)
- Jie Zan
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Juan Liu
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Jian-Wei Zhou
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Hai-Long Wang
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Kai-Kun Mo
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Yan Yan
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Yun-Bin Xu
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Min Liao
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China
| | - Shuo Su
- Institute of Immunology, Nanjing Agricultural University, Nanjing, PR China
| | - Rong-Liang Hu
- Laboratory of Epidemiology, Veterinary Institute, Academy of military Medical Sciences, Changchun, PR China
| | - Ji-Yong Zhou
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, PR China; Collaborative Innovation Center and State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University, Hangzhou, PR China; Institute of Immunology, Nanjing Agricultural University, Nanjing, PR China.
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5
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Rabies virus phosphoprotein interacts with mitochondrial Complex I and induces mitochondrial dysfunction and oxidative stress. J Neurovirol 2015; 21:370-82. [PMID: 25698500 DOI: 10.1007/s13365-015-0320-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 01/09/2015] [Accepted: 01/16/2015] [Indexed: 12/25/2022]
Abstract
Our previous studies in an experimental model of rabies showed neuronal process degeneration in association with severe clinical disease. Cultured adult rodent dorsal root ganglion neurons infected with challenge virus standard (CVS)-11 strain of rabies virus (RABV) showed axonal swellings and reduced axonal growth with evidence of oxidative stress. We have shown that CVS infection alters a variety of mitochondrial parameters and increases reactive oxygen species (ROS) production and mitochondrial Complex I activity vs. mock infection. We have hypothesized that a RABV protein targets mitochondria and triggers dysfunction. Mitochondrial extracts of mouse neuroblastoma cells were analyzed with a proteomics approach. We have identified peptides belonging to the RABV nucleocapsid protein (N), phosphoprotein (P), and glycoprotein (G), and our data indicate that the extract was most highly enriched with P. P was also detected by immunoblotting in RABV-infected purified mitochondrial extracts and also in Complex I immunoprecipitates from the extracts but not in mock-infected extracts. A plasmid expressing P in cells increased Complex I activity and increased ROS generation, whereas expression of other RABV proteins did not. We have analyzed recombinant plasmids encoding various P gene segments. Expression of a peptide from amino acid 139-172 increased Complex I activity and ROS generation similar to expression of the entire P protein, whereas peptides that did not contain this region did not increase Complex I activity or induce ROS generation. These results indicate that a region of the RABV P interacts with Complex I in mitochondria causing mitochondrial dysfunction, increased generation of ROS, and oxidative stress.
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6
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Mitochondrial dysfunction in rabies virus infection of neurons. J Neurovirol 2013; 19:537-49. [PMID: 24277436 DOI: 10.1007/s13365-013-0214-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 09/20/2013] [Accepted: 10/01/2013] [Indexed: 12/21/2022]
Abstract
Infection with the challenge virus standard-11 (CVS) strain of fixed rabies virus induces neuronal process degeneration in adult mice after hindlimb footpad inoculation. CVS-induced axonal swellings of primary rodent dorsal root ganglion neurons are associated with 4-hydroxy-2-nonenal protein adduct staining, indicating a critical role of oxidative stress. Mitochondrial dysfunction is the major cause of oxidative stress. We hypothesized that CVS infection induces mitochondrial dysfunction leading to oxidative stress. We investigated the effects of CVS infection on several mitochondrial parameters in different cell types. CVS infection significantly increased maximal uncoupled respiration and complex IV respiration and complex I and complex IV activities, but did not affect complex II-III or citrate synthase activities. Increases in complex I activity, but not complex IV activity, correlated with susceptibility of the cells to CVS infection. CVS infection maintained coupled respiration and rate of proton leak, indicating a tight mitochondrial coupling. Possibly as a result of enhanced complex activity and efficient coupling, a high mitochondrial membrane potential was generated. CVS infection reduced the intracellular ATP level and altered the cellular redox state as indicated by a high NADH/NAD+ ratio. The basal production of reactive oxygen species (ROS) was not affected in CVS-infected neurons. However, a higher rate of ROS generation occurred in CVS-infected neurons in the presence of mitochondrial substrates and inhibitors. We conclude that CVS infection induces mitochondrial dysfunction leading to ROS overgeneration and oxidative stress.
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7
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Hastie E, Cataldi M, Marriott I, Grdzelishvili VZ. Understanding and altering cell tropism of vesicular stomatitis virus. Virus Res 2013; 176:16-32. [PMID: 23796410 DOI: 10.1016/j.virusres.2013.06.003] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Revised: 06/06/2013] [Accepted: 06/07/2013] [Indexed: 12/18/2022]
Abstract
Vesicular stomatitis virus (VSV) is a prototypic nonsegmented negative-strand RNA virus. VSV's broad cell tropism makes it a popular model virus for many basic research applications. In addition, a lack of preexisting human immunity against VSV, inherent oncotropism and other features make VSV a widely used platform for vaccine and oncolytic vectors. However, VSV's neurotropism that can result in viral encephalitis in experimental animals needs to be addressed for the use of the virus as a safe vector. Therefore, it is very important to understand the determinants of VSV tropism and develop strategies to alter it. VSV glycoprotein (G) and matrix (M) protein play major roles in its cell tropism. VSV G protein is responsible for VSV broad cell tropism and is often used for pseudotyping other viruses. VSV M affects cell tropism via evasion of antiviral responses, and M mutants can be used to limit cell tropism to cell types defective in interferon signaling. In addition, other VSV proteins and host proteins may function as determinants of VSV cell tropism. Various approaches have been successfully used to alter VSV tropism to benefit basic research and clinically relevant applications.
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Affiliation(s)
- Eric Hastie
- Department of Biology, University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223, United States
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Cytopathogenesis of vesicular stomatitis virus is regulated by the PSAP motif of M protein in a species-dependent manner. Viruses 2012; 4:1605-18. [PMID: 23170175 PMCID: PMC3499822 DOI: 10.3390/v4091605] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 09/11/2012] [Accepted: 09/12/2012] [Indexed: 11/17/2022] Open
Abstract
Vesicular stomatitis virus (VSV) is an important vector-borne pathogen of bovine and equine species, causing a reportable vesicular disease. The matrix (M) protein of VSV is multifunctional and plays a key role in cytopathogenesis, apoptosis, host protein shut-off, and virion assembly/budding. Our previous findings indicated that mutations of residues flanking the 37PSAP40 motif within the M protein resulted in VSV recombinants having attenuated phenotypes in mice. In this report, we characterize the phenotype of VSV recombinant PS > A4 (which harbors four alanines (AAAA) in place of the PSAP motif without disruption of flanking residues) in both mice, and in Aedes albopictus C6/36 mosquito and Culicoides sonorensis KC cell lines. The PS > A4 recombinant displayed an attenuated phenotype in infected mice as judged by weight loss, mortality, and viral titers measured from lung and brain samples of infected animals. However, unexpectedly, the PS > A4 recombinant displayed a robust cytopathic phenotype in insect C6/36 cells compared to that observed with control viruses. Notably, titers of recombinant PS > A4 were approximately 10-fold greater than those of control viruses in infected C6/36 cells and in KC cells from Culicoides sonorensis, a known VSV vector species. In addition, recombinant PS > A4 induced a 25-fold increase in the level of C3 caspase activity in infected C6/36 cells. These findings indicate that the PSAP motif plays a direct role in regulating cytopathogenicity in a species-dependent manner, and suggest that the intact PSAP motif may be important for maintaining persistence of VSV in an insect host.
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Abstract
Recent studies in an experimental model of rabies indicated that there are major structural changes in the brain involving neuronal processes that are associated with severe clinical disease. Cultured adult mouse dorsal root ganglion (DRG) neurons are a good in vitro model for studying the mechanisms involved in rabies virus-induced degeneration of neurites (axons) because, unlike other neuronal cell types, these neurons are fairly permissive to rabies virus infection. DRG neurons infected with the challenge virus standard-11 (CVS) strain of rabies virus show axonal swellings and immunostaining for 4-hydroxy-2-nonenal (4-HNE), indicating evidence of lipid peroxidation associated with oxidative stress, and also reduced axonal growth in comparison with mock-infected DRG neurons. Treatment with the antioxidant N-acetyl cysteine prevented the reduction in axonal outgrowth that occurred with CVS infection. The axonal swellings with 4-HNE-labeled puncta were found to be associated with aggregations of actively respiring mitochondria. We postulate that rabies virus infection likely induces mitochondrial dysfunction resulting in oxidative stress and degenerative changes involving neuronal processes. This mitochondrial dysfunction may be the result of either direct or indirect effects of the virus on the mitochondrial electron-transport chain or it may occur through other mechanisms. Further investigations are needed to gain a better understanding of the basic mechanisms involved in the oxidative damage associated with rabies virus infection. This information may prove helpful in the design of future therapeutic effects for this dreaded ancient disease.
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Affiliation(s)
- Alan C Jackson
- Department of Internal Medicine (Neurology), University of Manitoba, Winnipeg, Manitoba, Canada
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10
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Ormazabal V, Zuñiga FA, Escobar E, Aylwin C, Salas-Burgos A, Godoy A, Reyes AM, Vera JC, Rivas CI. Histidine residues in the Na+-coupled ascorbic acid transporter-2 (SVCT2) are central regulators of SVCT2 function, modulating pH sensitivity, transporter kinetics, Na+ cooperativity, conformational stability, and subcellular localization. J Biol Chem 2010; 285:36471-85. [PMID: 20843809 DOI: 10.1074/jbc.m110.155630] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Na(+)-coupled ascorbic acid transporter-2 (SVCT2) activity is impaired at acid pH, but little is known about the molecular determinants that define the transporter pH sensitivity. SVCT2 contains six histidine residues in its primary sequence, three of which are exofacial in the transporter secondary structure model. We used site-directed mutagenesis and treatment with diethylpyrocarbonate to identify histidine residues responsible for SVCT2 pH sensitivity. We conclude that five histidine residues, His(109), His(203), His(206), His(269), and His(413), are central regulators of SVCT2 function, participating to different degrees in modulating pH sensitivity, transporter kinetics, Na(+) cooperativity, conformational stability, and subcellular localization. Our results are compatible with a model in which (i) a single exofacial histidine residue, His(413), localized in the exofacial loop IV that connects transmembrane helices VII-VIII defines the pH sensitivity of SVCT2 through a mechanism involving a marked attenuation of the activation by Na(+) and loss of Na(+) cooperativity, which leads to a decreased V(max) without altering the transport K(m); (ii) exofacial histidine residues His(203), His(206), and His(413) may be involved in maintaining a functional interaction between exofacial loops II and IV and influence the general folding of the transporter; (iii) histidines 203, 206, 269, and 413 affect the transporter kinetics by modulating the apparent transport K(m); and (iv) histidine 109, localized at the center of transmembrane helix I, might be fundamental for the interaction of SVCT2 with the transported substrate ascorbic acid. Thus, histidine residues are central regulators of SVCT2 function.
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Affiliation(s)
- Valeska Ormazabal
- Departamento de Fisiopatología, Facultad de Ciencias Biológicas, Universidad de Concepción, Barrio Universitario, Casilla 160C, Concepción, Chile
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11
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Diallo JS, Le Boeuf F, Lai F, Cox J, Vaha-Koskela M, Abdelbary H, MacTavish H, Waite K, Falls T, Wang J, Brown R, Blanchard JE, Brown ED, Kirn DH, Hiscott J, Atkins H, Lichty BD, Bell JC. A high-throughput pharmacoviral approach identifies novel oncolytic virus sensitizers. Mol Ther 2010; 18:1123-9. [PMID: 20389287 PMCID: PMC2889739 DOI: 10.1038/mt.2010.67] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Accepted: 03/16/2010] [Indexed: 12/18/2022] Open
Abstract
Oncolytic viruses (OVs) are promising anticancer agents but like other cancer monotherapies, the genetic heterogeneity of human malignancies can lead to treatment resistance. We used a virus/cell-based assay to screen diverse chemical libraries to identify small molecules that could act in synergy with OVs to destroy tumor cells that resist viral infection. Several molecules were identified that aid in viral oncolysis, enhancing virus replication and spread as much as 1,000-fold in tumor cells. One of these molecules we named virus-sensitizers 1 (VSe1), was found to target tumor innate immune response and could enhance OV efficacy in animal tumor models and within primary human tumor explants while remaining benign to normal tissues. We believe this is the first example of a virus/cell-based "pharmacoviral" screen aimed to identify small molecules that modulate cellular response to virus infection and enhance oncolytic virotherapy.
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Affiliation(s)
- Jean-Simon Diallo
- Ottawa Hospital Research Institute, Center for Cancer Therapeutics, Ottawa, Ontario, Canada
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D'Agostino PM, Reiss CS. A confocal and electron microscopic comparison of interferon beta-induced changes in vesicular stomatitis virus infection of neuroblastoma and nonneuronal cells. DNA Cell Biol 2010; 29:103-20. [PMID: 20113203 DOI: 10.1089/dna.2009.0963] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Vesicular stomatitis virus (VSV) replication is highly sensitive to interferon (IFN)-induced antiviral responses. Pretreatment of sensitive cultured cells with IFNbeta results in a 10(4)-fold reduction in the release of infectious VSV particles. However, differences exist between the mechanisms of reduced infectious particle titers in cell lines of neuroblastoma and nonneuronal lineage. In L929-fibroblast-derived cells, using immunofluorescence confocal microscopy, infection under control conditions reveals the accumulation of VSV matrix, phosphoprotein (P), and nucleocapsid (N) proteins over time, with induced cellular morphological changes indicative of cytopathic effects (CPEs). Upon observing L929 cells that had been pretreated with IFNbeta, neither detectable VSV proteins nor CPEs were seen, consistent with type I IFN antiviral protection. When using the same techniques to observe VSV infections of NB41A3 cells, a neuroblastoma cell line, aside from similar viral progression in the untreated control cells, IFNbeta-treated cells illustrated a severely attenuated VSV infection. Attenuated VSV progression was observed through detection of VSV matrix, P, and N proteins in isolated cells during the first 8 h of infection. However, by 18-24 h postinfection all neuroblastomas had succumbed to the viral infection. Finally, upon closer inspection of IFNbeta-treated NB41A3 cells, no detectable changes in VSV protein localization were identified compared with untreated, virally infected neuroblastomas. Next, to extend our study to test our hypothesis that virion assembly is compromised within type I IFN-treated neuroblastoma cells, we employed electron microscopy to examine our experimental conditions at the ultrastructural level. Using VSV-specific antibodies in conjunction with immuno-gold reagents, we observed several similarities between the two cell lines, such as identification of viroplasmic regions containing VSV N and P proteins and signs of stress-induced CPEs of VSV-infected cells, which had either been mock-treated or pretreated with interferon-beta (IFNbeta). One difference we observed between nonneuronal and neuroblastoma cells was more numerous actively budding VSV virions across untreated L929 plasma membranes compared with untreated NB41A3 cells. Additionally, IFNbeta-treated, VSV-infected L929 cells exhibited neither cytoplasmic viroplasm nor viral protein expression. In contrast, IFNbeta-treated, VSV-infected NB41A3 cells showed evidence of VSV infection at a very low frequency as well as small-scale viroplasmic regions that colocalized with viral N and P proteins. Finally, we observed that VSV viral particles harvested from untreated VSV-infected L929 and NB41A3 cells were statistically similar in size and shape. A portion of VSV virions from IFNbeta-treated, virally infected NB41A3 cells were similar in size and shape to virus from both untreated cell types. However, among the sampling of virions, pleomorphic viral particles that were identified from IFNbeta-treated, VSV-infected NB41A3 cells were different enough to suggest a misassembly mechanism as part of the IFNbeta antiviral state in neuroblastoma cells.
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Affiliation(s)
- Paul M D'Agostino
- Department of Biology, New York University, New York, 10003-6688, USA
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D'agostino PM, Amenta JJ, Reiss CS. IFN-beta-induced alteration of VSV protein phosphorylation in neuronal cells. Viral Immunol 2010; 22:353-69. [PMID: 19951173 DOI: 10.1089/vim.2009.0057] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Vesicular stomatitis virus (VSV) replication is highly sensitive to interferon (IFN)-induced antiviral responses. VSV infection of well-known cell lines pretreated with IFN-beta results in a 10(4)-fold reduction in the release of infectious particles, with a concomitant abrogation in viral transcript and/or protein levels. However, in cell lines of neuronal lineage only a threefold reduction in viral transcript and protein levels was observed, despite the same 10(4)-fold reduction in released infectious virions, suggesting an assembly defect. Examination of VSV matrix (M) protein ubiquitination yielded no differences between mock- and IFN-beta-treated neuronal cells. Further analysis of potential post-translational modification events, by scintillation and two-dimensional electrophoretic methods, revealed IFN-beta-induced alterations in M protein and phosphoprotein (P) phosphorylation. Hypophosphorylated P protein was demonstrated by reduced (32)P counts, normalized by (35)S-cysteine/methionine incorporation, and by a shift in isoelectric focusing. Hypophosphorylation of VSV P protein was found to occur in neuronal cell lysates, but not within budded virions from the same IFN-beta-treated cells. In contrast, hyperphosphorylation of VSV M protein was observed in both cell lysates and viral particles from IFN-beta-treated neuronal cells. Hyperphosphorylated M protein was demonstrated by increased (32)P counts relative to (35)S-cysteine/methionine normalization, and by altered isoelectric focusing in protein populations from cell and viral lysates. Hyperphosphorylated VSV M protein was found to inhibit its association with VSV nucleocapsid, suggesting a possible mechanism for type I IFN-mediated misassembly through disruption of the interactions between ribonucleoprotein cores, and hyperphosphorylated M protein bound to the plasma membrane inner leaflet.
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Affiliation(s)
- Paul M D'agostino
- Biology Department, New York University, New York, New York 10003-6688, USA
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Graham SC, Assenberg R, Delmas O, Verma A, Gholami A, Talbi C, Owens RJ, Stuart DI, Grimes JM, Bourhy H. Rhabdovirus matrix protein structures reveal a novel mode of self-association. PLoS Pathog 2008; 4:e1000251. [PMID: 19112510 PMCID: PMC2603668 DOI: 10.1371/journal.ppat.1000251] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2008] [Accepted: 12/01/2008] [Indexed: 01/18/2023] Open
Abstract
The matrix (M) proteins of rhabdoviruses are multifunctional proteins essential for virus maturation and budding that also regulate the expression of viral and host proteins. We have solved the structures of M from the vesicular stomatitis virus serotype New Jersey (genus: Vesiculovirus) and from Lagos bat virus (genus: Lyssavirus), revealing that both share a common fold despite sharing no identifiable sequence homology. Strikingly, in both structures a stretch of residues from the otherwise-disordered N terminus of a crystallographically adjacent molecule is observed binding to a hydrophobic cavity on the surface of the protein, thereby forming non-covalent linear polymers of M in the crystals. While the overall topology of the interaction is conserved between the two structures, the molecular details of the interactions are completely different. The observed interactions provide a compelling model for the flexible self-assembly of the matrix protein during virion morphogenesis and may also modulate interactions with host proteins.
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Affiliation(s)
- Stephen C. Graham
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - René Assenberg
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Olivier Delmas
- UPRE Lyssavirus Dynamics and Host Adaptation, WHO Collaborating Centre for Reference and Research on Rabies, Institut Pasteur, Paris, France
| | - Anil Verma
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Alireza Gholami
- UPRE Lyssavirus Dynamics and Host Adaptation, WHO Collaborating Centre for Reference and Research on Rabies, Institut Pasteur, Paris, France
| | - Chiraz Talbi
- UPRE Lyssavirus Dynamics and Host Adaptation, WHO Collaborating Centre for Reference and Research on Rabies, Institut Pasteur, Paris, France
| | - Raymond J. Owens
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - David I. Stuart
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Jonathan M. Grimes
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Hervé Bourhy
- UPRE Lyssavirus Dynamics and Host Adaptation, WHO Collaborating Centre for Reference and Research on Rabies, Institut Pasteur, Paris, France
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Gholami A, Kassis R, Real E, Delmas O, Guadagnini S, Larrous F, Obach D, Prevost MC, Jacob Y, Bourhy H. Mitochondrial dysfunction in lyssavirus-induced apoptosis. J Virol 2008; 82:4774-84. [PMID: 18321977 PMCID: PMC2346764 DOI: 10.1128/jvi.02651-07] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2007] [Accepted: 02/22/2008] [Indexed: 12/25/2022] Open
Abstract
Lyssaviruses are highly neurotropic viruses associated with neuronal apoptosis. Previous observations have indicated that the matrix proteins (M) of some lyssaviruses induce strong neuronal apoptosis. However, the molecular mechanism(s) involved in this phenomenon is still unknown. We show that for Mokola virus (MOK), a lyssavirus of low pathogenicity, the M (M-MOK) targets mitochondria, disrupts the mitochondrial morphology, and induces apoptosis. Our analysis of truncated M-MOK mutants suggests that the information required for efficient mitochondrial targeting and dysfunction, as well as caspase-9 activation and apoptosis, is held between residues 46 and 110 of M-MOK. We used a yeast two-hybrid approach, a coimmunoprecipitation assay, and confocal microscopy to demonstrate that M-MOK physically associates with the subunit I of the cytochrome c (cyt-c) oxidase (CcO) of the mitochondrial respiratory chain; this is in contrast to the M of the highly pathogenic Thailand lyssavirus (M-THA). M-MOK expression induces a significant decrease in CcO activity, which is not the case with M-THA. M-MOK mutations (K77R and N81E) resulting in a similar sequence to M-THA at positions 77 and 81 annul cyt-c release and apoptosis and restore CcO activity. As expected, the reverse mutations, R77K and E81N, introduced in M-THA induce a phenotype similar to that due to M-MOK. These features indicate a novel mechanism for energy depletion during lyssavirus-induced apoptosis.
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Affiliation(s)
- Alireza Gholami
- Unité Postulante de Recherche et d'Expertise Dynamique des Lyssavirus et Adaptation à l'Hôte, Institut Pasteur, 25 rue du Docteur Roux, 75724 Paris Cedex 15, France
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Genomic characterisation of Wongabel virus reveals novel genes within the Rhabdoviridae. Virology 2008; 376:13-23. [PMID: 18436275 DOI: 10.1016/j.virol.2008.03.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2007] [Revised: 10/17/2007] [Accepted: 03/10/2008] [Indexed: 11/21/2022]
Abstract
Viruses belonging to the family Rhabdoviridae infect a variety of different hosts, including insects, vertebrates and plants. Currently, there are approximately 200 ICTV-recognised rhabdoviruses isolated around the world. However, the majority remain poorly characterised and only a fraction have been definitively assigned to genera. The genomic and transcriptional complexity displayed by several of the characterised rhabdoviruses indicates large diversity and complexity within this family. To enable an improved taxonomic understanding of this family, it is necessary to gain further information about the poorly characterised members of this family. Here we present the complete genome sequence and predicted transcription strategy of Wongabel virus (WONV), a previously uncharacterised rhabdovirus isolated from biting midges (Culicoides austropalpalis) collected in northern Queensland, Australia. The 13,196 nucleotide genome of WONV encodes five typical rhabdovirus genes N, P, M, G and L. In addition, the WONV genome contains three genes located between the P and M genes (U1, U2, U3) and two open reading frames overlapping with the N and G genes (U4, U5). These five additional genes and their putative protein products appear to be novel, and their functions are unknown. Predictive analysis of the U5 gene product revealed characteristics typical of viroporins, and indicated structural similarities with the alpha-1 protein (putative viroporin) of viruses in the genus Ephemerovirus. Phylogenetic analyses of the N and G proteins of WONV indicated closest similarity with the avian-associated Flanders virus; however, the genomes of these two viruses are significantly diverged. WONV displays a novel and unique genome structure that has not previously been described for any animal rhabdovirus.
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Sharif-Askari E, Nakhaei P, Oliere S, Tumilasci V, Hernandez E, Wilkinson P, Lin R, Bell J, Hiscott J. Bax-dependent mitochondrial membrane permeabilization enhances IRF3-mediated innate immune response during VSV infection. Virology 2007; 365:20-33. [PMID: 17451770 DOI: 10.1016/j.virol.2007.03.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2006] [Revised: 02/26/2007] [Accepted: 03/01/2007] [Indexed: 11/24/2022]
Abstract
An effective type I interferon (IFN-alpha/beta) response is critical for the control of many viral infections. Using an oncolytic strain of vesicular stomatitis virus, we have examined the cross-talk between virus-induced apoptosis and initiation of innate immune response. The intrinsic apoptotic cascade, specifically the Bax-Bcl-2-Caspase-9 cascade, was revealed as the primary pathway of VSV-induced apoptosis. Cell death was significantly reduced in BaxBak(-/-) murine embryonic fibroblasts (MEFs) and in human A549 epithelial cells treated with siRNA against Bax. Although inhibition of apoptosis resulted in enhanced virus replication in the BaxBak(-/-) MEFs as compared to wild-type cells, induction of the IFN antiviral response and expression of cytokine genes were attenuated in virus-infected cells. Moreover, Bax but not Bak pro-apoptotic protein was required for IRF-3 phosphorylation and activation, further substantiating a role for the intrinsic mitochondrial pathway in the innate immune response. Therefore, virus-induced apoptosis through a Bax-dependent mitochondrial pathway appears to enhance the full development of the IRF-3 mediated IFN antiviral response.
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Affiliation(s)
- Ehssan Sharif-Askari
- Molecular Oncology Group, Lady Davis Institute, Jewish General Hospital, McGill University, Montreal, Quebec, Canada
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