1
|
Nurmukanova V, Matsvay A, Gordukova M, Shipulin G. Square the Circle: Diversity of Viral Pathogens Causing Neuro-Infectious Diseases. Viruses 2024; 16:787. [PMID: 38793668 PMCID: PMC11126052 DOI: 10.3390/v16050787] [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: 03/27/2024] [Revised: 05/08/2024] [Accepted: 05/10/2024] [Indexed: 05/26/2024] Open
Abstract
Neuroinfections rank among the top ten leading causes of child mortality globally, even in high-income countries. The crucial determinants for successful treatment lie in the timing and swiftness of diagnosis. Although viruses constitute the majority of infectious neuropathologies, diagnosing and treating viral neuroinfections remains challenging. Despite technological advancements, the etiology of the disease remains undetermined in over half of cases. The identification of the pathogen becomes more difficult when the infection is caused by atypical pathogens or multiple pathogens simultaneously. Furthermore, the modern surge in global passenger traffic has led to an increase in cases of infections caused by pathogens not endemic to local areas. This review aims to systematize and summarize information on neuroinvasive viral pathogens, encompassing their geographic distribution and transmission routes. Emphasis is placed on rare pathogens and cases involving atypical pathogens, aiming to offer a comprehensive and structured catalog of viral agents with neurovirulence potential.
Collapse
Affiliation(s)
- Varvara Nurmukanova
- Federal State Budgetary Institution “Centre for Strategic Planning and Management of Biomedical Health Risks” of the Federal Medical Biological Agency, 119121 Moscow, Russia
| | - Alina Matsvay
- Federal State Budgetary Institution “Centre for Strategic Planning and Management of Biomedical Health Risks” of the Federal Medical Biological Agency, 119121 Moscow, Russia
| | - Maria Gordukova
- G. Speransky Children’s Hospital No. 9, 123317 Moscow, Russia
| | - German Shipulin
- Federal State Budgetary Institution “Centre for Strategic Planning and Management of Biomedical Health Risks” of the Federal Medical Biological Agency, 119121 Moscow, Russia
| |
Collapse
|
2
|
Ivin YY, Butusova AA, Gladneva EE, Kolomijtseva GY, Khapchaev YK, Ishmukhametov AA. [The role of the encephalomyocarditis virus type 1 proteins L and 2A in the inhibition of the synthesis of cellular proteins and the accumulation of viral proteins during infection]. Vopr Virusol 2023; 68:428-444. [PMID: 38156577 DOI: 10.36233/0507-4088-195] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 12/04/2020] [Indexed: 12/30/2023]
Abstract
INTRODUCTION Infection of cells with encephalomyocarditis virus type 1 (EMCV-1, Cardiovirus A: Picornaviridae) is accompanied by suppression of cellular protein synthesis. The main role in the inhibition of cellular translation is assigned to the L and 2A «security» proteins. The mechanism of the possible influence of the L protein on cellular translation is unknown. There are hypotheses about the mechanism of influence of 2A protein on the efficiency of cap-dependent translation, which are based on interaction with translation factors and ribosome subunits. However, the available experimental data are contradictory, obtained using different approaches, and do not form a unified model of the interaction between the L and 2A proteins and the cellular translation machinery. AIM To study the role of L and 2A «security» proteins in the suppression of translation of cellular proteins and the efficiency of translation and processing of viral proteins in infected cells. MATERIALS AND METHODS Mutant variants of EMCV-1 were obtained to study the properties of L and 2A viral proteins: Zfmut, which has a defective L; Δ2A encoding a partially deleted 2A; Zfmut&Δ2A containing mutations in both proteins. Translational processes in infected cells were studied by Western-blot and the pulse method of incorporating radioactively labeled amino acids (14C) into newly synthesized proteins, followed by radioautography. RESULTS The functional inactivation of the 2A protein does not affect the inhibition of cellular protein synthesis. A direct correlation was found between the presence of active L protein and specific inactivation of cellular protein synthesis at an early stage of viral infection. Nonspecific suppression of the translational processes of the infected cell, accompanied by phosphorylation of eIF2α, occurs at the late stage of infection. Partial removal of the 2A protein from the EMCV-1 genome does not affect the development of this process, while inactivation of the L protein accelerates the onset of complete inhibition of protein synthesis. Partial deletion of the 2A disrupts the processing of viral capsid proteins. Suppression of L protein functions leads to a decrease in the efficiency of viral translation. CONCLUSION A study of the role of EMCV-1 L and 2A proteins during the translational processes of an infected cell, first performed using infectious viral pathogens lacking active L and 2A proteins in one experiment, showed that 2A protein is not implicated in the inhibition of cellular translation in HeLa cells; L protein seems to play an important role not only in the specific inhibition of cellular translation but also in maintaining the efficient synthesis of viral proteins; 2A protein is involved not only in primary but also in secondary processing of EMCV-1 capsid proteins.
Collapse
Affiliation(s)
- Y Y Ivin
- Federal State Autonomous Scientific Institution M.P. Chumakov Federal Scientific Center for Research and Development of Immunobiological Drugs of the Russian Academy of Sciences (Polio Institute)
| | - A A Butusova
- Federal State Autonomous Scientific Institution M.P. Chumakov Federal Scientific Center for Research and Development of Immunobiological Drugs of the Russian Academy of Sciences (Polio Institute)
| | - E E Gladneva
- Federal State Autonomous Scientific Institution M.P. Chumakov Federal Scientific Center for Research and Development of Immunobiological Drugs of the Russian Academy of Sciences (Polio Institute)
| | - G Y Kolomijtseva
- A.N. Belozersky Research Institute of Physico-Chemical Biology MSU
| | - Y K Khapchaev
- Federal State Autonomous Scientific Institution M.P. Chumakov Federal Scientific Center for Research and Development of Immunobiological Drugs of the Russian Academy of Sciences (Polio Institute)
| | - A A Ishmukhametov
- Federal State Autonomous Scientific Institution M.P. Chumakov Federal Scientific Center for Research and Development of Immunobiological Drugs of the Russian Academy of Sciences (Polio Institute)
- Institute for Translational Medicine and Biotechnology, Sechenov First Moscow State Medical University
| |
Collapse
|
3
|
Ciapă MA, Șalaru DL, Stătescu C, Sascău RA, Bogdănici CM. Optic Neuritis in Multiple Sclerosis—A Review of Molecular Mechanisms Involved in the Degenerative Process. Curr Issues Mol Biol 2022; 44:3959-3979. [PMID: 36135184 PMCID: PMC9497878 DOI: 10.3390/cimb44090272] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 11/26/2022] Open
Abstract
Multiple sclerosis is a central nervous system inflammatory demyelinating disease with a wide range of clinical symptoms, ocular involvement being frequently marked by the presence of optic neuritis (ON). The emergence and progression of ON in multiple sclerosis is based on various pathophysiological mechanisms, disease progression being secondary to inflammation, demyelination, or axonal degeneration. Early identification of changes associated with axonal degeneration or further investigation of the molecular processes underlying remyelination are current concerns of researchers in the field in view of the associated therapeutic potential. This article aims to review and summarize the scientific literature related to the main molecular mechanisms involved in defining ON as well as to analyze existing data in the literature on remyelination strategies in ON and their impact on long-term prognosis.
Collapse
Affiliation(s)
| | - Delia Lidia Șalaru
- Cardiology Clinic, Institute of Cardiovascular Diseases, 700503 Iași, Romania
- Department of Internal Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, 700115 Iași, Romania
- Correspondence:
| | - Cristian Stătescu
- Cardiology Clinic, Institute of Cardiovascular Diseases, 700503 Iași, Romania
- Department of Internal Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, 700115 Iași, Romania
| | - Radu Andy Sascău
- Cardiology Clinic, Institute of Cardiovascular Diseases, 700503 Iași, Romania
- Department of Internal Medicine, University of Medicine and Pharmacy “Grigore T. Popa”, 700115 Iași, Romania
| | - Camelia Margareta Bogdănici
- Department of Surgical Specialties (II), University of Medicine and Pharmacy “Grigore T. Popa”, 700115 Iași, Romania
- Ophthalmology Clinic, Saint Spiridon Hospital, Iași 700111, Romania
| |
Collapse
|
4
|
Ao Y, Xu J, Duan Z. A novel cardiovirus species identified in feces of wild Himalayan marmots. INFECTION, GENETICS AND EVOLUTION : JOURNAL OF MOLECULAR EPIDEMIOLOGY AND EVOLUTIONARY GENETICS IN INFECTIOUS DISEASES 2022; 103:105347. [PMID: 35932998 DOI: 10.1016/j.meegid.2022.105347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 07/17/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Recently a growing number of novel cardioviruses have been frequently discovered, which boosts interest in the search for the genetic diversity of cardioviruses. However, wild-marmot cardioviruses have been rarely reported. Here, a novel cardiovirus (tentatively named HHMCDV) was identified in fecal samples from wild Himalayan marmots in Qinghai Tibetan Plateau, China, by viral metagenomics analysis. 3 out of 99 fecal samples from Himalayan marmots were positive for HHMCDV, with the viral loads ranging from 2.7 × 105 to 1.3 × 107 gene copies/g. The complete genomic sequence of HHMCDV was 8108 nucleotides in length, with the typical cardiovirus genome organization and motifs. Coincidentally, while the data was analyzing, one marmot cardiovirus HT7 partial sequence was available in the Genbank, showing 95.1%, 95.6% and 96.0% amino acid (aa) identity in P1, P2 and P3, respectively. However, sequence analysis revealed that HHMCDV and HT7 are more closely related to species Cardiovirus F strain with 65.7%, 61.9-65.6%, 58.9-59.7%, 71.1-71.7%, 69.1-69.4% and 71.4-72.2% aa identity in polyprotein, P1, P2, P3, 2C and 3CD proteins, respectively. Phylogenetic analysis of P1, P2, P3 and 3CD aa sequences indicated that HHMCDV and HT7 clustered tightly and formed a distinct cluster in the Cardiovirus genus. Based on these data, we propose that HHMCDV and HT7 should be two different members of a potential novel species within the genus Cardiovirus. Further studies are needed to investigate the epidemiology and potential pathogenicity of the virus in Himalayan marmots.
Collapse
Affiliation(s)
- Yuanyun Ao
- Department of Clinical Laboratory, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai 201102, China; National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - Jin Xu
- Department of Clinical Laboratory, Children's Hospital of Fudan University, National Children's Medical Center, Shanghai 201102, China; Shanghai Institute of Infectious Disease and Biosecurity, Fudan University, Shanghai 201102, China.
| | - Zhaojun Duan
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
| |
Collapse
|
5
|
Kuznetsova V, Tyakht A, Akhmadishina L, Odintsova V, Klimenko N, Kostryukova E, Vakhitova M, Grigoryeva T, Malanin S, Vladimirtsev V, Nikitina R, Volok V, Osakovskiy V, Sivtseva T, Platonov F, Alexeev D, Karganova G. Gut microbiome signature of Viliuisk encephalomyelitis in Yakuts includes an increase in microbes linked to lean body mass and eating behaviour. Orphanet J Rare Dis 2020; 15:327. [PMID: 33218345 PMCID: PMC7678198 DOI: 10.1186/s13023-020-01612-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 11/10/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Viliuisk encephalomyelitis (VE) is a rare endemic neurodegenerative disease occurring in the Yakut population of Northeastern Siberia. The main clinical features of VE are spasticity, dysarthria, dementia, central paresis and paralysis, and cortical atrophy observed via MRI. Many hypotheses have been proposed regarding its etiology, including infectious agents, genetics, environmental factors, and immunopathology. Each of these hypotheses has been supported to some extent by epidemiological and experimental data. Nevertheless, none of them has been decisively proven. Gut microbiome is one of the factors that might be involved in VE pathogenesis. RESULTS Here we performed a pilot survey of the stool microbiomes of Yakut subjects with VE (n = 6) and without VE (n = 11). 16S rRNA sequencing showed that in comparison with the control group, the Yakuts with VE had increased proportions of Methanobrevibacter and Christensenella, which are reported to be linked to body mass index, metabolism, dietary habits and potentially to neurodegenerative disorders. The identified associations suggest that the microbiome may be involved in VE. Overall, the Yakut microbiome was quite specific in comparison with other populations, such as metropolitan Russians and native inhabitants of the Canadian Arctic. CONCLUSIONS Describing the gut microbiome of indigenous human populations will help to elucidate the impact of dietary and environmental factors on microbial community structure and identify risks linked to the lifestyles of such groups as well as endemic diseases.
Collapse
Affiliation(s)
- Veronika Kuznetsova
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Institute of Gene Biology of Russian Academy of Science, Vavilova Str. 34/5, 119334, Moscow, Russian Federation
- Moscow Institute of Physics and Technology, Kerchenskaya Str. 1A, Moscow, Russian Federation, 117303
| | - Alexander Tyakht
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Institute of Gene Biology of Russian Academy of Science, Vavilova Str. 34/5, 119334, Moscow, Russian Federation.
- Atlas Biomed Group - Knomics LLC, Tintagel House, 92 Albert Embankment, Lambeth, London, SE1 7TY, UK.
| | - Lyudmila Akhmadishina
- Sechenov First Moscow State Medical University, Trubetskaya Str. 8-2, 119991, Moscow, Russian Federation
| | - Vera Odintsova
- Atlas Biomed Group - Knomics LLC, Tintagel House, 92 Albert Embankment, Lambeth, London, SE1 7TY, UK
| | - Natalia Klimenko
- Center for Precision Genome Editing and Genetic Technologies for Biomedicine, Institute of Gene Biology of Russian Academy of Science, Vavilova Str. 34/5, 119334, Moscow, Russian Federation
- Atlas Biomed Group - Knomics LLC, Tintagel House, 92 Albert Embankment, Lambeth, London, SE1 7TY, UK
| | - Elena Kostryukova
- Federal Research and Clinical Centre of Physical-Chemical Medicine of Federal Medical Biological Agency, Malaya Pirogovskaya Str. 1a, 119435, Moscow, Russian Federation
| | - Maria Vakhitova
- Moscow Institute of Physics and Technology, Kerchenskaya Str. 1A, Moscow, Russian Federation, 117303
- Federal Research and Clinical Centre of Physical-Chemical Medicine of Federal Medical Biological Agency, Malaya Pirogovskaya Str. 1a, 119435, Moscow, Russian Federation
| | - Tatyana Grigoryeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, K. Marx Str. 18, 420012, Kazan, Russian Federation
| | - Sergey Malanin
- Institute of Fundamental Medicine and Biology, Kazan Federal University, K. Marx Str. 18, 420012, Kazan, Russian Federation
| | - Vsevolod Vladimirtsev
- Research Center of Medical Institute, M.K. Ammosov North-Eastern Federal University, Belinsky Str. 58, 677027, Yakutsk, Russian Federation
| | - Raisa Nikitina
- Research Center of Medical Institute, M.K. Ammosov North-Eastern Federal University, Belinsky Str. 58, 677027, Yakutsk, Russian Federation
| | - Viktor Volok
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI "Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, 108819, Moscow, Russian Federation
| | - Vladimir Osakovskiy
- Research Center of Medical Institute, M.K. Ammosov North-Eastern Federal University, Belinsky Str. 58, 677027, Yakutsk, Russian Federation
| | - Tatiana Sivtseva
- Research Center of Medical Institute, M.K. Ammosov North-Eastern Federal University, Belinsky Str. 58, 677027, Yakutsk, Russian Federation
| | - Fyodor Platonov
- Research Center of Medical Institute, M.K. Ammosov North-Eastern Federal University, Belinsky Str. 58, 677027, Yakutsk, Russian Federation
| | - Dmitry Alexeev
- Atlas Biomed Group - Knomics LLC, Tintagel House, 92 Albert Embankment, Lambeth, London, SE1 7TY, UK
- ITMO University, Kronverkskiy pr. 49, 197101, Saint-Petersburg, Russian Federation
| | - Galina Karganova
- Sechenov First Moscow State Medical University, Trubetskaya Str. 8-2, 119991, Moscow, Russian Federation
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI "Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, 108819, Moscow, Russian Federation
| |
Collapse
|
6
|
Ghosh A, Shcherbik N. Effects of Oxidative Stress on Protein Translation: Implications for Cardiovascular Diseases. Int J Mol Sci 2020; 21:E2661. [PMID: 32290431 PMCID: PMC7215667 DOI: 10.3390/ijms21082661] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 04/08/2020] [Accepted: 04/09/2020] [Indexed: 02/06/2023] Open
Abstract
Cardiovascular diseases (CVDs) are a group of disorders that affect the heart and blood vessels. Due to their multifactorial nature and wide variation, CVDs are the leading cause of death worldwide. Understanding the molecular alterations leading to the development of heart and vessel pathologies is crucial for successfully treating and preventing CVDs. One of the causative factors of CVD etiology and progression is acute oxidative stress, a toxic condition characterized by elevated intracellular levels of reactive oxygen species (ROS). Left unabated, ROS can damage virtually any cellular component and affect essential biological processes, including protein synthesis. Defective or insufficient protein translation results in production of faulty protein products and disturbances of protein homeostasis, thus promoting pathologies. The relationships between translational dysregulation, ROS, and cardiovascular disorders will be examined in this review.
Collapse
Affiliation(s)
- Arnab Ghosh
- Department for Cell Biology and Neuroscience, School of Osteopathic Medicine, Rowan University, 2 Medical Center Drive, Stratford, NJ 08084, USA
| | - Natalia Shcherbik
- Department for Cell Biology and Neuroscience, School of Osteopathic Medicine, Rowan University, 2 Medical Center Drive, Stratford, NJ 08084, USA
| |
Collapse
|
7
|
Wang Y, Zhao J, Zheng M, Liu Z, Li W, Fu X, Lin Y, Yuan J, Zhao J, Shen Q, Wang X, Wang H, Yang S. A novel cardiovirus in wild rats. Virol J 2018; 15:58. [PMID: 29587779 PMCID: PMC5872539 DOI: 10.1186/s12985-018-0968-9] [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: 06/06/2017] [Accepted: 03/19/2018] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Cardioviruses cause severe illnesses in rodents and humans. In recent years, novel cardioviruses have been frequently found, which promoted further studies of the genetic diversity of cardioviruses. Using viral metagenomics, we genetically characterized a novel cardiovirus (named SX1) from wild rat feces. The genomic structure of SX1 shared similar features with those of the Theiler's murine encephalomyelitis viruses, including a leader protein, four structural proteins and seven non-structural proteins. Phylogenetic analysis based on both structural proteins and non-structural proteins coding regions showed that SX1 was formed into a separate branch, being located between the branches of Theiler's murine encephalomyelitis viruses and Thera viruses. Variable resides presented in the Ser/Thr rich domain of L protein, VP1 loops, and VP2 puffs distinguished SX1 from Theiler's murine encephalomyelitis viruses, suggesting the different antigenicity and pathogenicity of SX1.
Collapse
Affiliation(s)
- Yan Wang
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Jing Zhao
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Min Zheng
- Department of Gynecology, Rizhao Maternity& Infant Health Hospital, Rizhao, Shandong, 276800, People's Republic of China
| | - Zhijian Liu
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Wang Li
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Xingli Fu
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Yuan Lin
- School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia, 750000, People's Republic of China
| | - Jiaqi Yuan
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Jieji Zhao
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Quan Shen
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Xiaochun Wang
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Hua Wang
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Shixing Yang
- School of Medicine, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu, 212013, People's Republic of China.
| |
Collapse
|
8
|
Sivtseva TM, Vladimirtsev VA, Nikitina RS, Davidova TK, Popov DA, Osakovsky VL. Intrathecal synthesis of oligoclonal IgG in patients with Viliuisk encephalomyelitis: The relationship between oligoclonal bands and clinical features. J Neurol Sci 2017; 384:84-88. [PMID: 29249384 DOI: 10.1016/j.jns.2017.11.030] [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: 06/16/2017] [Revised: 10/23/2017] [Accepted: 11/21/2017] [Indexed: 12/30/2022]
Abstract
Viliuisk encephalomyelitis (VE) is a neurodegenerative disease that afflicts aboriginal people of Yakutia in Siberia with unknown etiology. Oligoclonal IgG bands (OCBs) were discovered in the VE patients (Green et al., 2003). In this study we analysed the association of OCBs with clinical symptoms in 58 VE patients. Positive oligoclonal IgG are associated with a shorter duration of disease (p=0.002), older age of onset (p=0.023) and high frequency of main neurological VE symptoms such as dementia, frontal dysbasia, bulbar disorders, muscle atrophy and centrally caused pelvic disorders. Our results show that the OCBs in VE patients are associated with more severe central nervous system (CNS) damage and may cause secondary complications in the course of the disease.
Collapse
Affiliation(s)
| | | | - Raisa S Nikitina
- Institute of Health, North-Eastern Federal University, Yakutsk, Russia
| | | | - Dygyn A Popov
- Department of Radiology, Republican Hospital #2 - Center of Emergency Medicine, Yakutsk, Russia
| | | |
Collapse
|
9
|
Nonstructural Protein L* Species Specificity Supports a Mouse Origin for Vilyuisk Human Encephalitis Virus. J Virol 2017; 91:JVI.00573-17. [PMID: 28446680 DOI: 10.1128/jvi.00573-17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 04/21/2017] [Indexed: 11/20/2022] Open
Abstract
Vilyuisk human encephalitis virus (VHEV) is a picornavirus related to Theiler's murine encephalomyelitis virus (TMEV). VHEV was isolated from human material passaged in mice. Whether this VHEV is of human or mouse origin is therefore unclear. We took advantage of the species-specific activity of the nonstructural L* protein of theiloviruses to track the origin of TMEV isolates. TMEV L* inhibits RNase L, the effector enzyme of the interferon pathway. By using coimmunoprecipitation and functional RNase L assays, the species specificity of RNase L antagonism was tested for L* from mouse (DA) and rat (RTV-1) TMEV strains as well as for VHEV. Coimmunoprecipitation and functional assay data confirmed the species specificity of L* activity and showed that L* from rat strain RTV-1 inhibited rat but not mouse or human RNase L. Next, we showed that the VHEV L* protein was phylogenetically related to L* of mouse viruses and that it failed to inhibit human RNase L but readily antagonized mouse RNase L, unambiguously showing the mouse origin of VHEV.IMPORTANCE Defining the natural host of a virus can be a thorny issue, especially when the virus was isolated only once or when the isolation story is complex. The species Theilovirus includes Theiler's murine encephalomyelitis virus (TMEV), infecting mice and rats, and Saffold virus (SAFV), infecting humans. One TMEV strain, Vilyuisk human encephalitis virus (VHEV), however, was isolated from mice that were inoculated with cerebrospinal fluid of a patient presenting with chronic encephalitis. It is therefore unclear whether VHEV was derived from the human sample or from the inoculated mouse. The L* protein encoded by TMEV inhibits RNase L, a cellular enzyme involved in innate immunity, in a species-specific manner. Using binding and functional assays, we show that this species specificity even allows discrimination between TMEV strains of mouse and of rat origins. The VHEV L* protein clearly inhibited mouse but not human RNase L, indicating that this virus originates from mice.
Collapse
|
10
|
Sorgeloos F, Lardinois C, Jacobs S, van Kuppeveld FJM, Kaspers B, Michiels T. Neurotropism of Saffold virus in a mouse model. J Gen Virol 2016; 97:1350-1355. [PMID: 26959376 DOI: 10.1099/jgv.0.000452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Saffold virus (SAFV) is a highly seroprevalent human Cardiovirus discovered recently. No clear association between SAFV infection and human disease has been established. Rare infection cases, however, correlated with neurological symptoms. To gain insight into the pathogenesis potential of the virus, we performed experimental mouse infection with SAFV strains of genotypes 2 and 3 (SAFV-2 and SAFV-3). After intraperitoneal infection, both strains exhibited a typical Cardiovirus tropism. Viral load was most prominent in the pancreas. Heart, spleen, brain and spinal cord were also infected. In IFN-receptor 1 deficient (IFNAR-KO) mice, SAFV-3 caused a severe encephalitis. The virus was detected by immunohistochemistry in many parts of the brain and spinal cord, both in neurons and astrocytes, but astrocyte infection was more extensive. In vitro, SAFV-3 also infected astrocytes better than neurons in mixed primary cultures. Astrocytes were, however, very efficiently protected by IFN-α/β treatment.
Collapse
Affiliation(s)
- Frédéric Sorgeloos
- Department of Pathology, Addenbrooke's Hospital, University of Cambridge, Hills Road, Cambridge, UK
| | - Cécile Lardinois
- de Duve Institute, Université Catholique de Louvain, VIRO B1.74.07, 74 Avenue Hippocrate, Brussels B-1200, Belgium
| | - Sophie Jacobs
- de Duve Institute, Université Catholique de Louvain, VIRO B1.74.07, 74 Avenue Hippocrate, Brussels B-1200, Belgium
| | - Frank J M van Kuppeveld
- Moleculaire Virologie, Universiteit Utrecht, Yalelaan 1 Kamer W.512, 3584 CL Utrecht, The Netherlands
| | - Bernd Kaspers
- Institut für Tierphysiologie, Veterinärstr 13, 80539 München, Germany
| | - Thomas Michiels
- de Duve Institute, Université Catholique de Louvain, VIRO B1.74.07, 74 Avenue Hippocrate, Brussels B-1200, Belgium
| |
Collapse
|
11
|
Zhang XA, Lu QB, Wo Y, Zhao J, Huang DD, Guo CT, Xu HM, Liu EM, Liu W, Cao WC. Prevalence and genetic characteristics of Saffold cardiovirus in China from 2009 to 2012. Sci Rep 2015; 5:7704. [PMID: 25572936 PMCID: PMC5378990 DOI: 10.1038/srep07704] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Accepted: 12/08/2014] [Indexed: 12/28/2022] Open
Abstract
The epidemiology and clinical features of the Saffold cardiovirus (SAFV) remain ambiguous. The present study was designed to systematically and intensively investigate the epidemiological features of SAFV in pediatric patients in China. Three cohorts of pediatric patients were recruited from 2009 to 2012. Cohort 1 comprised patients with acute respiratory tract infections. Cohort 2 comprised patients with diarrhea. Cohort 3 comprised hand, foot, and mouth disease (HFMD) patients. A total of 115 patients (1.6%) among 6052 (17/1647, 12/2013, and 86/2392 in cohorts 1, 2, and 3, respectively) were SAFV-positive. The samples from 82 SAFV-positive patients were successfully sequenced, and four genotypes were identified: 8 SAFV-1, 41 SAFV-2, 29 SAFV-3, and 4 SAFV-6. A significantly higher detection rate was found in the HFMD patients than in other two cohorts (both P <0.001). A higher frequency of severe clinical outcome and nervous system manifestation were also observed in the SAFV-positive HFMD patients. Additionally, 6 (3.5%) cerebrospinal fluid and 7 (2.2%) serum samples from the HFMD-associated encephalitis patients were SAFV-positive. Based on the VP1 sequences, all four genotypes displayed distinct geographical clustering. SAFV infection might be associated with a wide clinical spectrum and contribute to HFMD.
Collapse
Affiliation(s)
- Xiao-Ai Zhang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 100071, Beijing, P. R. China
| | - Qing-Bin Lu
- School of Public Health, Peking University, 100191, Beijing, P. R. China
| | - Ying Wo
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 100071, Beijing, P. R. China
| | - Jin Zhao
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 100071, Beijing, P. R. China
| | - Dou-Dou Huang
- 1] State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 100071, Beijing, P. R. China [2] Graduate School of Anhui Medical University, 230032, Hefei, P. R. China
| | - Chen-Tao Guo
- 1] State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 100071, Beijing, P. R. China [2] Graduate School of Anhui Medical University, 230032, Hefei, P. R. China
| | - Hong-Mei Xu
- Children's Hospital of Chongqing Medical University, 400014, Chongqing, P. R. China
| | - En-Mei Liu
- Children's Hospital of Chongqing Medical University, 400014, Chongqing, P. R. China
| | - Wei Liu
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 100071, Beijing, P. R. China
| | - Wu-Chun Cao
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 100071, Beijing, P. R. China
| |
Collapse
|
12
|
Cusick MF, Libbey JE, Fujinami RS. Picornavirus infection leading to immunosuppression. Future Virol 2014; 9:475-482. [PMID: 25214881 DOI: 10.2217/fvl.14.26] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Viruses, such as HIV, hepatitis A, poliovirus, coxsackievirus B3 and foot-and-mouth disease virus, use a variety of mechanisms to suppress the human immune system in order to evade clearance by the host. Therefore, investigating how a few changes in the viral genome of a nonlethal virus can lead to an alteration in disease, from survivable to immunosuppression and death, would provide valuable information into viral pathogenesis. In addition, we propose that gaining a better insight into how these viruses suppress an antiviral immune response could lead to viral-based therapeutics to combat specifc autoimmune diseases such as multiple sclerosis and Type 1 diabetes.
Collapse
Affiliation(s)
- Matthew F Cusick
- Department of Pathology, University of Utah, 15 North Medical Drive East, 2600 EEJMRB, Salt Lake City, UT 84112, USA
| | - Jane E Libbey
- Department of Pathology, University of Utah, 15 North Medical Drive East, 2600 EEJMRB, Salt Lake City, UT 84112, USA
| | - Robert S Fujinami
- Department of Pathology, University of Utah, 15 North Medical Drive East, 2600 EEJMRB, Salt Lake City, UT 84112, USA
| |
Collapse
|
13
|
Bell MP, Renner DN, Johnson AJ, Pavelko KD. An elite controller of picornavirus infection targets an epitope that is resistant to immune escape. PLoS One 2014; 9:e94332. [PMID: 24710606 PMCID: PMC3978045 DOI: 10.1371/journal.pone.0094332] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 03/13/2014] [Indexed: 11/22/2022] Open
Abstract
The emergence of novel viral pathogens can lead to devastating consequences in the infected population. However, on occasion, rare hyper-responsive elite controllers are able to mount a protective primary response to infection and clear the new pathogen. Factors distinguishing elite controllers from other members of the population are not completely understood. We have been using Theiler's murine encephalomyelitis as a model of primary infection in mice and clearance of the virus is limited to one MHC genotype capable of generating a protective response to a single viral peptide VP2121-130. The genetics of host susceptibility to TMEV, a natural mouse pathogen, has been studied extensively and non-protective CD8 responses to other peptides have been documented, however, little is known why the protective response to infection focuses on the VP2121-130 peptide. To study this question, we have generated TMEV mutants that encode for mutations within the VP2121-130 peptide. We find that very few of mutants are able to assemble and infect in vitro. These mutations are not related to virus RNA structure since non-coding mutations do not interfere with assembly. In the rare event when functional VP2121-130 mutant viruses did emerge, they were attenuated to some level or retained the ability to develop an immune response to the wild-type VP2121-130 sequence, demonstrating that the virus is incapable of escaping the protective response. These findings advance our understanding of how characteristics of the host immune response and an infectious agent can interact to lead to the appearance of rare super controllers in a population. Furthermore, the immutable nature of the viral antigen highlights the importance of choosing appropriate vaccine antigens and has implications for the development of agents that are able to generate protective CD8 T-cell responses.
Collapse
Affiliation(s)
- Michael P. Bell
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Danielle N. Renner
- Neurobiology of Disease Program, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Aaron J. Johnson
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
- Department of Neurology, Mayo Graduate School, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Kevin D. Pavelko
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
- * E-mail:
| |
Collapse
|
14
|
Miljković D, Spasojević I. Multiple sclerosis: molecular mechanisms and therapeutic opportunities. Antioxid Redox Signal 2013; 19:2286-334. [PMID: 23473637 PMCID: PMC3869544 DOI: 10.1089/ars.2012.5068] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Revised: 02/09/2012] [Accepted: 03/09/2013] [Indexed: 12/15/2022]
Abstract
The pathophysiology of multiple sclerosis (MS) involves several components: redox, inflammatory/autoimmune, vascular, and neurodegenerative. All of them are supported by the intertwined lines of evidence, and none of them should be written off. However, the exact mechanisms of MS initiation, its development, and progression are still elusive, despite the impressive pace by which the data on MS are accumulating. In this review, we will try to integrate the current facts and concepts, focusing on the role of redox changes and various reactive species in MS. Knowing the schedule of initial changes in pathogenic factors and the key turning points, as well as understanding the redox processes involved in MS pathogenesis is the way to enable MS prevention, early treatment, and the development of therapies that target specific pathophysiological components of the heterogeneous mechanisms of MS, which could alleviate the symptoms and hopefully stop MS. Pertinent to this, we will outline (i) redox processes involved in MS initiation; (ii) the role of reactive species in inflammation; (iii) prooxidative changes responsible for neurodegeneration; and (iv) the potential of antioxidative therapy.
Collapse
Affiliation(s)
- Djordje Miljković
- Department of Immunology, Institute for Biological Research “Siniša Stanković,” University of Belgrade, Belgrade, Serbia
| | - Ivan Spasojević
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia
| |
Collapse
|
15
|
Tapparel C, Siegrist F, Petty TJ, Kaiser L. Picornavirus and enterovirus diversity with associated human diseases. INFECTION GENETICS AND EVOLUTION 2012. [PMID: 23201849 DOI: 10.1016/j.meegid.2012.10.016] [Citation(s) in RCA: 313] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Members of the Picornaviridae family are non-enveloped, positive-stranded RNA viruses with a 30nm icosahedral capsid. This virus family exhibits a considerable amount of genetic variability driven both by mutation and recombination. Recently, three previously unknown human picornaviruses, namely the human Saffold cardiovirus, cosavirus and salivirus, have been identified in stools or respiratory samples from subjects presenting symptoms ranging from gastroenteritis to acute flaccid paralysis. However, these viruses were also frequently detected in asymptomatic subjects and their clinical relevance remains to be elucidated. The Enterovirus genus is a prototype example of the Picornaviridae heterogeneity at both genetic and phenotypic levels. This genus is divided into 10 species, seven of which contain human viruses, including three Rhinovirus species. Both human rhino- and enteroviruses are also characterized by high levels of genetic variability, as exemplified by the existence of over 250 different serotypes and the recent discovery of new enterovirus genotypes and the Rhinovirus C species. Despite their common genomic features, rhinoviruses are restricted to the respiratory tract, whereas the vast majority of enteroviruses infect the gastrointestinal tract and can spread to other organs, such as the heart or the central nervous system. Understanding the genetic determinants of such phenotypic diversity is an important challenge and a field for future investigation. Better characterization of these ubiquitous human pathogens may help to develop vaccines or antiviral treatments and to monitor the emergence of new strains.
Collapse
Affiliation(s)
- Caroline Tapparel
- Laboratory of Virology, Division of Infectious Diseases and Division of Laboratory Medicine, University of Geneva Hospitals, 4 Rue Gabrielle-Perret-Gentil, 1211 Geneva 14, Switzerland.
| | | | | | | |
Collapse
|
16
|
Philipps A, Dauber M, Groth M, Schirrmeier H, Platzer M, Krumbholz A, Wutzler P, Zell R. Isolation and molecular characterization of a second serotype of the encephalomyocarditis virus. Vet Microbiol 2012; 161:49-57. [PMID: 22824255 DOI: 10.1016/j.vetmic.2012.07.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Revised: 06/27/2012] [Accepted: 07/02/2012] [Indexed: 10/28/2022]
Abstract
Encephalomyocarditis virus (EMCV) and Theilovirus are the two species of the Cardiovirus genus. Whereas theiloviruses comprise several sero-/genotypes, all known EMCV isolates are serologically very similar and are thought to belong to one serotype, named EMCV-1. Here, a novel EMCV type is described. Strain RD 1338 (D28/05) was isolated from a wood mouse (Apodemus sylvaticus) in Germany and can be distinguished from EMCV-1 by serological and molecular means. Failure of EMCV-1 specific hyperimmune sera to neutralize RD 1338 suggests a distinct serotype. The viral genome was de novo sequenced using next-generation Illumina/Solexa technologies. Considerable differences of the BC-loop/loop I/loop II sequences of VP1, the VP2 puff and the VP3 knob provide a structural basis for deviant serological properties. Sequence alignments reveal amino acid identities of 75 percent for the P1 region and 84 percent for the P2 and P3 regions when comparing RD 1338 to EMCV-1 strains and some 60 percent and less than 50 percent amino acid identities, respectively, for comparisons with theilovirus strains. Phylogenetic analyses of the P1, 2C and 3CD gene regions support the establishment of an EMCV-2 serotype. In contrast to the theilovirus sero-/genotypes that show a narrow host range, EMCV-1 infects a wide variety of hosts. The host range of EMCV-2 remains to be determined.
Collapse
Affiliation(s)
- Anja Philipps
- Department of Virology and Antiviral Therapy, Jena University Hospital, Friedrich Schiller University, Hans Knoell Str. 2, 07745 Jena, Germany
| | | | | | | | | | | | | | | |
Collapse
|
17
|
Nielsen ACY, Böttiger B, Banner J, Hoffmann T, Nielsen LP. Serious invasive Saffold virus infections in children, 2009. Emerg Infect Dis 2012; 18:7-12. [PMID: 22261113 PMCID: PMC3310106 DOI: 10.3201/eid1801.110725] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
This virus might have caused previously unexplained cerebral infections and deaths in children. The first human virus in the genus Cardiovirus was described in 2007 and named Saffold virus (SAFV). Cardioviruses can cause severe infections of the myocardium and central nervous system in animals, but SAFV has not yet been convincingly associated with disease in humans. To study a possible association between SAFV and infections in the human central nervous system, we designed a real-time PCR for SAFV and tested cerebrospinal fluid (CSF) samples from children <4 years of age. SAFV was detected in 2 children: in the CSF and a fecal sample from 1 child with monosymptomatic ataxia caused by cerebellitis; and in the CSF, blood, and myocardium of another child who died suddenly with no history of illness. Virus from each child was sequenced and shown to be SAFV type 2. These findings demonstrate that SAFV can cause serious invasive infection in children.
Collapse
|
18
|
Drexler JF, Baumgarte S, Eschbach-Bludau M, Simon A, Kemen C, Bode U, Eis-Hübinger AM, Madea B, Drosten C. Human cardioviruses, meningitis, and sudden infant death syndrome in children. Emerg Infect Dis 2012; 17:2313-5. [PMID: 22153118 PMCID: PMC3311172 DOI: 10.3201/eid1712.111037] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Cardioviruses cause myocarditis and encephalomyelitis in rodents; human cardioviruses have not been ascribed to any disease. We screened 6,854 cerebrospinal fluid and 10 myocardium specimens from children and adults. A genotype 2 cardiovirus was detected from a child who died of sudden infant death syndrome, and 2 untypeable cardioviruses were detected from 2 children with meningitis.
Collapse
|
19
|
Abstract
Although cardioviruses have been thought to mainly infect rodents, a novel human cardiovirus, designated Saffold virus (SAFV), was identified in 2007. SAFV is grouped with Theiler-like rat virus and Theiler's murine encephalomyelitis virus (TMEV) in the species Theilovirus of the genus Cardiovirus of the family Picornaviridae. Eight genotypes of SAFV have now been identified. SAFV has been isolated from nasal and stool specimens from infants presenting with respiratory and gastrointestinal symptoms as well as from children with nonpolio acute flaccid paralysis; however, the relationship of SAFV to this symptomatology remains unclear. Of note, the virus has also been isolated from the cerebrospinal fluid specimens of patients with aseptic meningitis. This finding is of interest since TMEV is known to cause a multiple sclerosis-like syndrome in mice. The involvement of SAFV in various diseases (e.g., respiratory illness, gastrointestinal illness, neurological diseases, and type I diabetes) is presently under investigation. In order to clarify the pathogenicity of SAFV, additional epidemiological studies are required. Furthermore, identification of the SAFV cellular receptor will help establish an animal model for SAFV infection and help clarify the pathogenesis of SAFV-related diseases. In addition, investigation of the tissue-specific expression of the receptor may facilitate development of a novel picornavirus vector, which could be a useful tool in gene therapy for humans. The study of viral factors involved in viral pathogenicity using a reverse genetics technique will also be important.
Collapse
|
20
|
Cultivation and serological characterization of a human Theiler's-like cardiovirus associated with diarrheal disease. J Virol 2010; 84:4407-14. [PMID: 20164225 DOI: 10.1128/jvi.02536-09] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cardioviruses (e.g., Theiler's murine encephalomyelitis virus [TMEV]) are members of the Picornaviridae family that cause myocarditis and encephalitis in rodents. Recently, several studies have identified human cardioviruses, including Saffold virus (SAFV) and a related virus named human TMEV-like cardiovirus (HTCV). At least eight cardiovirus genotypes are now recognized, with SAFV and most strains of HTCV belonging to genotypes 1 and 2, respectively; genotype 2 strains are the most common in the population. Although a genotype 3 cardiovirus has recently been cultured (SAFV-3), the genotype 1 and 2 cardioviruses have been difficult to propagate in vitro, hindering efforts to understand their seroprevalence and pathogenicity. Here we present the isolation and characterization of a genotype 2 human cardiovirus (HTCV-UC6). Notably, successful cultivation of HTCV-UC6 from stool required the addition of cytokine-blocking antibodies to interrupt downstream antiviral pathways. Unlike SAFV-3, HTCV-UC6 exhibited slow replication kinetics and demonstrated only a moderate cytopathic effect. Serologic assays revealed that 91% of U.S. adults carry antibodies to the genotype 2 cardioviruses, of which 80% generate neutralizing antibodies, in agreement with previous data showing that cardiovirus infection is widespread in humans. We also demonstrate an acute cardiovirus seroconversion event in a child with diarrhea and vomiting, thus reporting for the first time evidence linking cardiovirus infection to diarrheal disease in humans.
Collapse
|
21
|
Interactions between viral and prokaryotic pathogens in a mixed infection with cardiovirus and mycoplasma. J Virol 2009; 83:9940-51. [PMID: 19605479 DOI: 10.1128/jvi.01167-09] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
In the natural environment, animal and plant viruses often share ecological niches with microorganisms, but the interactions between these pathogens, although potentially having important implications, are poorly investigated. The present report demonstrates, in a model system, profound mutual effects of mycoplasma and cardioviruses in animal cell cultures. In contrast to mycoplasma-free cells, cultures contaminated with Mycoplasma hyorhinis responded to infection with encephalomyocarditis virus (EMCV), a picornavirus, but not with poliovirus (also a picornavirus), with a strong activation of a DNase(s), as evidenced by the TUNEL (terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling) immunofluorescence assay and electrophoretic analysis of host DNA. This degradation was reminiscent of that observed upon apoptosis but was caspase independent, judging by the failure of the specific pan-caspase inhibitor Q-VD-OPh to prevent it. The electrophoretic mobility of the enzyme responsible for DNA degradation and dependence of its activity on ionic conditions strongly suggested that it was represented by a DNase(s) of mycoplasma origin. In cells not infected with EMCV, the relevant DNase was dormant. The possibility is discussed that activation of the mycoplasma DNase might be linked to a relatively early increase in permeability of plasma membrane of the infected cells caused by EMCV. This type of unanticipated virus-mycoplasma "cooperation" may exemplify the complexity of pathogen-host interactions under conditions when viruses and microorganisms are infecting the same host. In the course of the present study, it was also demonstrated that pan-caspase inhibitor zVAD(OMe).fmk strongly suppressed cardiovirus polyprotein processing, illustrating an additional pitfall in investigations of viral effects on the apoptotic system of host cells.
Collapse
|
22
|
Zoll J, Erkens Hulshof S, Lanke K, Verduyn Lunel F, Melchers WJG, Schoondermark-van de Ven E, Roivainen M, Galama JMD, van Kuppeveld FJM. Saffold virus, a human Theiler's-like cardiovirus, is ubiquitous and causes infection early in life. PLoS Pathog 2009; 5:e1000416. [PMID: 19412527 PMCID: PMC2670511 DOI: 10.1371/journal.ppat.1000416] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Accepted: 04/07/2009] [Indexed: 12/23/2022] Open
Abstract
The family Picornaviridae contains well-known human pathogens (e.g., poliovirus, coxsackievirus, rhinovirus, and parechovirus). In addition, this family contains a number of viruses that infect animals, including members of the genus Cardiovirus such as Encephalomyocarditis virus (EMCV) and Theiler's murine encephalomyelits virus (TMEV). The latter are important murine pathogens that cause myocarditis, type 1 diabetes and chronic inflammation in the brains, mimicking multiple sclerosis. Recently, a new picornavirus was isolated from humans, named Saffold virus (SAFV). The virus is genetically related to Theiler's virus and classified as a new species in the genus Cardiovirus, which until the discovery of SAFV did not contain human viruses. By analogy with the rodent cardioviruses, SAFV may be a relevant new human pathogen. Thus far, SAFVs have sporadically been detected by molecular techniques in respiratory and fecal specimens, but the epidemiology and clinical significance remained unclear. Here we describe the first cultivated SAFV type 3 (SAFV-3) isolate, its growth characteristics, full-length sequence, and epidemiology. Unlike the previously isolated SAFV-1 and -2 viruses, SAFV-3 showed efficient growth in several cell lines with a clear cytopathic effect. The latter allowed us to conduct a large-scale serological survey by a virus-neutralization assay. This survey showed that infection by SAFV-3 occurs early in life (>75% positive at 24 months) and that the seroprevalence reaches >90% in older children and adults. Neutralizing antibodies were found in serum samples collected in several countries in Europe, Africa, and Asia. In conclusion, this study describes the first cultivated SAFV-3 isolate, its full-length sequence, and epidemiology. SAFV-3 is a highly common and widespread human virus causing infection in early childhood. This finding has important implications for understanding the impact of these ubiquitous viruses and their possible role in acute and/or chronic disease. Recently, a new picornavirus was isolated from humans, named Saffold virus (SAFV). Picornaviruses are small RNA viruses with poliovirus as prototype. Saffold virus is genetically related to Theiler's virus, a member of the Cardiovirus genus, which until this recent discovery did not contain human viruses. Theiler's virus is an important mouse pathogen that causes chronic inflammation in the brains, closely resembling multiple sclerosis in humans. By analogy, SAFV may be a relevant human pathogen. Thus far, SAFVs have been sporadically detected by molecular techniques in respiratory and fecal specimens, but the epidemiology and clinical significance have remained unclear. Here we describe the first SAFV type 3 (SAFV-3) isolate, its growth characteristics in cell lines, full-length RNA-sequence, and epidemiology. Unlike the previously isolated SAFV-1 and SAFV-2, SAFV-3 grows well in cell lines, resulting in cell damage. This feature enabled us to conduct a large-scale serological survey for virus-neutralizing antibodies. This survey showed that SAFV-3 infection occurs early in life and that >90% of children >2 years and adults had antibodies. Neutralizing antibodies were found in serum samples collected in several countries in three continents. Hence, we concluded that SAFV-3 is a genuine and widespread human virus causing infection early in life.
Collapse
Affiliation(s)
- Jan Zoll
- Department of Medical Microbiology, Virology Section, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Sandra Erkens Hulshof
- Department of Medical Microbiology, Virology Section, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Kjerstin Lanke
- Department of Medical Microbiology, Virology Section, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Frans Verduyn Lunel
- Department of Medical Microbiology, Virology Section, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Willem J. G. Melchers
- Department of Medical Microbiology, Virology Section, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | | | - Merja Roivainen
- Enterovirus Laboratory, National Public Health Institute, Helsinki, Finland
| | - Jochem M. D. Galama
- Department of Medical Microbiology, Virology Section, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- * E-mail: (JMDG); (FJMvK)
| | - Frank J. M. van Kuppeveld
- Department of Medical Microbiology, Virology Section, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- * E-mail: (JMDG); (FJMvK)
| |
Collapse
|
23
|
Cardioviruses are genetically diverse and cause common enteric infections in South Asian children. J Virol 2009; 83:4631-41. [PMID: 19193786 DOI: 10.1128/jvi.02085-08] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Cardioviruses cause enteric infections in mice and rats which when disseminated have been associated with myocarditis, type 1 diabetes, encephalitis, and multiple sclerosis-like symptoms. Cardioviruses have also been detected at lower frequencies in other mammals. The Cardiovirus genus within the Picornaviridae family is currently made up of two viral species, Theilovirus and Encephalomyocarditis virus. Until recently, only a single strain of cardioviruses (Vilyuisk virus within the Theilovirus species) associated with a geographically restricted and prevalent encephalitis-like condition had been reported to occur in humans. A second theilovirus-related cardiovirus (Saffold virus [SAFV]) was reported in 2007 and subsequently found in respiratory secretions from children with respiratory problems and in stools of both healthy and diarrheic children. Using viral metagenomics, we identified RNA fragments related to SAFV in the stools of Pakistani and Afghani children with nonpolio acute flaccid paralysis (AFP). We sequenced three near-full-length genomes, showing the presence of divergent strains of SAFV and preliminary evidence of a distant recombination event between the ancestors of the Theiler-like viruses of rats and those of human SAFV. Further VP1 sequencing showed the presence of five new SAFV genotypes, doubling the reported genetic diversity of human and animal theiloviruses combined. Both AFP patients and healthy children in Pakistan were found to be excreting SAFV at high frequencies of 9 and 12%, respectively. Further studies are needed to examine the roles of these highly common and diverse SAFV genotypes in nonpolio AFP and other human diseases.
Collapse
|