1
|
Liu SQ, Xie Y, Gao X, Wang Q, Zhu WY. Inflammatory response and MAPK and NF-κB pathway activation induced by natural street rabies virus infection in the brain tissues of dogs and humans. Virol J 2020; 17:157. [PMID: 33081802 PMCID: PMC7576862 DOI: 10.1186/s12985-020-01429-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 10/07/2020] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Street rabies virus (RABV) usually infects hosts at peripheral sites and migrates from motor or sensory nerves to the central nervous system. Several studies have found that inflammation is mild in a mouse model of street RABV infection. However, the pathogenetic mechanisms of street RABV in naturally infected dogs or humans are not well understood. METHODS Brain tissues collected from 3 dogs and 3 humans were used; these tissue samples were collected under the natural condition of rabies-induced death. The inflammatory response and pathway activation in the brain tissue samples of dogs and humans were evaluated by HE, IHC, ARY006, WB and ELISA. The clinical isolate street RABV strains CGS-17 and CXZ-15 from 30 six-week-old ICR mice were used to construct the mouse infection model presented here. RESULTS Neuronal degeneration and increased lymphocyte infiltration in the cerebral cortex, especially marked activation of microglia, formation of glial nodules, and neuronophagy, were observed in the dogs and humans infected with the street RABV strains. The various levels of proinflammatory chemokines, particularly CXCL1, CXCL12, CCL2, and CCL5, were increased significantly in the context of infection with street RABV strains in dogs and humans in relation to healthy controls, and the levels of MAPK and NF-κB phosphorylation were also increased in dogs and humans with natural infection. We also found that the degrees of pathological change, inflammatory response, MAPK and NF-κB signaling pathway activation were obviously increased during natural infection in dogs and humans compared with artificial model infection in mice. CONCLUSION The data obtained here provide direct evidence for the RABV-induced activation of the inflammatory response in a dog infection model, which is a relatively accurate reflection of the pathogenic mechanism of human street RABV infection. These observations provide insight into the precise roles of underlying mechanisms in fatal natural RABV infection.
Collapse
Affiliation(s)
- Shu Qing Liu
- Key Laboratory of Medical Virology, Ministry of Health, National Institute for Viral Disease Control and Prevention, NHC Key Laboratory of Biosafety, Chinese Center for Disease Control and Prevention, No.155 Changbai Road, Changping District, Beijing, 102206 People’s Republic of China
| | - Yuan Xie
- Key Laboratory of Medical Virology, Ministry of Health, National Institute for Viral Disease Control and Prevention, NHC Key Laboratory of Biosafety, Chinese Center for Disease Control and Prevention, No.155 Changbai Road, Changping District, Beijing, 102206 People’s Republic of China
- College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875 People’s Republic of China
| | - Xin Gao
- Key Laboratory of Medical Virology, Ministry of Health, National Institute for Viral Disease Control and Prevention, NHC Key Laboratory of Biosafety, Chinese Center for Disease Control and Prevention, No.155 Changbai Road, Changping District, Beijing, 102206 People’s Republic of China
- Pathogenic Microbiology Institute, Tianjin Centers for Disease Control and Prevention, Tianjin, 300011 People’s Republic of China
| | - Qian Wang
- Key Laboratory of Medical Virology, Ministry of Health, National Institute for Viral Disease Control and Prevention, NHC Key Laboratory of Biosafety, Chinese Center for Disease Control and Prevention, No.155 Changbai Road, Changping District, Beijing, 102206 People’s Republic of China
| | - Wu Yang Zhu
- Key Laboratory of Medical Virology, Ministry of Health, National Institute for Viral Disease Control and Prevention, NHC Key Laboratory of Biosafety, Chinese Center for Disease Control and Prevention, No.155 Changbai Road, Changping District, Beijing, 102206 People’s Republic of China
| |
Collapse
|
2
|
Monroy-Gómez J, Santamaría G, Sarmiento L, Torres-Fernández O. Effect of Postmortem Degradation on the Preservation of Viral Particles and Rabies Antigens in Mice Brains. Light and Electron Microscopic Study. Viruses 2020; 12:v12090938. [PMID: 32858805 PMCID: PMC7552013 DOI: 10.3390/v12090938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 04/13/2020] [Accepted: 04/22/2020] [Indexed: 11/16/2022] Open
Abstract
Rabies diagnosis is mainly made on fresh brain tissue postmortem by means of the direct immunofluorescence test. However, in some cases, it is not possible to use this technique, given that the affected nervous tissue goes through a postmortem degradation process, due to problems in the handling and transport of the samples. For this reason, the preservation in time of the rabies virus inclusions was assessed, as well as the immunoreactivity and the ultrastructure of viral particles in tissue with postmortem degradation. Brains of mice inoculated with rabies virus and control mice were processed for conventional histology, immunohistochemistry, electron microscopy, and immunoelectron microscopy in different postmortem times. In the processed tissues for hematoxylin and eosin, the presence of eosinophilic inclusions was not observed beyond 12 h postmortem. Surprisingly, the immunoreactivity of the viral antigens increased with time, at least until 30 h postmortem. It was possible to easily recognize the viral particles by means of conventional electron microscopy until 12 h postmortem. Immunoelectron microscopy allowed us to identify the presence of viral antigens disseminated in the neuronal cytoplasm until 30 h postmortem, but immunoreactive viral particles were not observed. The rabies infection did not cause histological or ultrastructural alterations different from those in the control group as a result of the postmortem degradation. In conclusion, the immunohistochemistry is a reliable test for rabies diagnosis in samples with postmortem degradation and that have been fixed with aldehydes.
Collapse
Affiliation(s)
- Jeison Monroy-Gómez
- Grupo de Morfología Celular, Instituto Nacional de Salud (INS), 111321 Bogotá, D.C., Colombia; (G.S.); (L.S.)
- Rehabilitation School of Colombia, Institución Universitaria Escuela Colombiana de Rehabilitación, 110121 Bogotá, D.C., Colombia
- Correspondence: (J.M.-G.); (O.T.-F.)
| | - Gerardo Santamaría
- Grupo de Morfología Celular, Instituto Nacional de Salud (INS), 111321 Bogotá, D.C., Colombia; (G.S.); (L.S.)
| | - Ladys Sarmiento
- Grupo de Morfología Celular, Instituto Nacional de Salud (INS), 111321 Bogotá, D.C., Colombia; (G.S.); (L.S.)
| | - Orlando Torres-Fernández
- Grupo de Morfología Celular, Instituto Nacional de Salud (INS), 111321 Bogotá, D.C., Colombia; (G.S.); (L.S.)
- Correspondence: (J.M.-G.); (O.T.-F.)
| |
Collapse
|
3
|
Mastraccio KE, Huaman C, Warrilow D, Smith GA, Craig SB, Weir DL, Laing ED, Smith IL, Broder CC, Schaefer BC. Establishment of a longitudinal pre-clinical model of lyssavirus infection. J Virol Methods 2020; 281:113882. [PMID: 32407866 PMCID: PMC8056983 DOI: 10.1016/j.jviromet.2020.113882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 04/19/2020] [Accepted: 05/07/2020] [Indexed: 12/12/2022]
Abstract
Traditional mouse models of lyssavirus pathogenesis rely on euthanizing large groups of animals at various time points post-infection, processing infected tissues, and performing histological and molecular analyses to determine anatomical sites of infection. While powerful by some measures, this approach is limited by the inability to monitor disease progression in the same mice over time. In this study, we established a novel non-invasive mouse model of lyssavirus pathogenesis, which consists of longitudinal imaging of a luciferase-expressing Australian bat lyssavirus (ABLV) reporter virus. In vivo bioluminescence imaging (BLI) in mice revealed viral spread from a peripheral site of inoculation into the central nervous system (CNS), with kinetically and spatially distinct foci of replication in the footpad, spinal cord, and hindbrain. Detection of virus within the CNS was associated with onset of clinical disease. Quantification of virus-derived luminescent signal in the brain was found to be a reliable measure of viral replication, when compared to traditional molecular methods. Furthermore, we demonstrate that in vivo imaging of ABLV infection is not restricted to the use of albino strains of mice, but rather strong BLI signal output can be achieved by shaving the hair from the heads and spines of pigmented strains, such as C57BL/6. Overall, our data show that in vivo BLI can be used to rapidly and non-invasively identify sites of lyssavirus replication and to semi-quantitatively determine viral load without the need to sacrifice mice at multiple time points.
Collapse
Affiliation(s)
- Kate E Mastraccio
- Uniformed Services University, Department of Microbiology and Immunology, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Celeste Huaman
- Uniformed Services University, Department of Microbiology and Immunology, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - David Warrilow
- Queensland Health Forensic and Scientific Services, Archerfield, Australia.
| | - Greg A Smith
- Queensland Health Forensic and Scientific Services, Archerfield, Australia.
| | - Scott B Craig
- Queensland Health Forensic and Scientific Services, Archerfield, Australia.
| | - Dawn L Weir
- Uniformed Services University, Department of Microbiology and Immunology, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Eric D Laing
- Uniformed Services University, Department of Microbiology and Immunology, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Ina L Smith
- Queensland Health Forensic and Scientific Services, Archerfield, Australia; Risk Evaluation and Preparedness Program, Health and Biosecurity, CSIRO, Black Mountain, ACT, Australia.
| | - Christopher C Broder
- Uniformed Services University, Department of Microbiology and Immunology, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Brian C Schaefer
- Uniformed Services University, Department of Microbiology and Immunology, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| |
Collapse
|
4
|
Inhibition of MALT1 Decreases Neuroinflammation and Pathogenicity of Virulent Rabies Virus in Mice. J Virol 2018; 92:JVI.00720-18. [PMID: 30158289 DOI: 10.1128/jvi.00720-18] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 08/05/2018] [Indexed: 12/15/2022] Open
Abstract
Rabies virus is a neurovirulent RNA virus, which causes about 59,000 human deaths each year. Treatment for rabies does not exist due to incomplete understanding of the pathogenesis. MALT1 mediates activation of several immune cell types and is involved in the proliferation and survival of cancer cells. MALT1 acts as a scaffold protein for NF-κB signaling and a cysteine protease that cleaves substrates, leading to the expression of immunoregulatory genes. Here, we examined the impact of genetic or pharmacological MALT1 inhibition in mice on disease development after infection with the virulent rabies virus strain CVS-11. Morbidity and mortality were significantly delayed in Malt1 -/- compared to Malt1 +/+ mice, and this effect was associated with lower viral load, proinflammatory gene expression, and infiltration and activation of immune cells in the brain. Specific deletion of Malt1 in T cells also delayed disease development, while deletion in myeloid cells, neuronal cells, or NK cells had no effect. Disease development was also delayed in mice treated with the MALT1 protease inhibitor mepazine and in knock-in mice expressing a catalytically inactive MALT1 mutant protein, showing an important role of MALT1 proteolytic activity. The described protective effect of MALT1 inhibition against infection with a virulent rabies virus is the precise opposite of the sensitizing effect of MALT1 inhibition that we previously observed in the case of infection with an attenuated rabies virus strain. Together, these data demonstrate that the role of immunoregulatory responses in rabies pathogenicity is dependent on virus virulence and reveal the potential of MALT1 inhibition for therapeutic intervention.IMPORTANCE Rabies virus is a neurotropic RNA virus that causes encephalitis and still poses an enormous challenge to animal and public health. Efforts to establish reliable therapeutic strategies have been unsuccessful and are hampered by gaps in the understanding of virus pathogenicity. MALT1 is an intracellular protease that mediates the activation of several innate and adaptive immune cells in response to multiple receptors, and therapeutic MALT1 targeting is believed to be a valid approach for autoimmunity and MALT1-addicted cancers. Here, we study the impact of MALT1 deficiency on brain inflammation and disease development in response to infection of mice with the highly virulent CVS-11 rabies virus. We demonstrate that pharmacological or genetic MALT1 inhibition decreases neuroinflammation and extends the survival of CVS-11-infected mice, providing new insights in the biology of MALT1 and rabies virus infection.
Collapse
|
5
|
Marosi A, Dufkova L, Forró B, Felde O, Erdélyi K, Širmarová J, Palus M, Hönig V, Salát J, Tikos R, Gyuranecz M, Růžek D, Martina B, Koraka P, Osterhaus ADME, Bakonyi T. Combination therapy of rabies-infected mice with inhibitors of pro-inflammatory host response, antiviral compounds and human rabies immunoglobulin. Vaccine 2018; 37:4724-4735. [PMID: 29805091 DOI: 10.1016/j.vaccine.2018.05.066] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 05/02/2018] [Accepted: 05/12/2018] [Indexed: 02/06/2023]
Abstract
Recent studies demonstrated that inhibitors of pro-inflammatory molecular cascades triggered by rabies infection in the central nervous system (CNS) can enhance survival in mouse model and that certain antiviral compounds interfere with rabies virus replication in vitro. In this study different combinations of therapeutics were tested to evaluate their effect on survival in rabies-infected mice, as well as on viral load in the CNS. C57Bl/6 mice were infected with Silver-haired bat rabies virus (SHBRV)-18 at virus dose approaching LD50 and LD100. In one experimental group daily treatments were initiated 4 h before-, in other groups 48 or 96 h after challenge. In the first experiment therapeutic combination contained inhibitors of tumour necrosis factor-α (infliximab), caspase-1 (Ac-YVAD-cmk), and a multikinase inhibitor (sorafenib). In the treated groups there was a notable but not significant increase of survival compared to the virus infected, non-treated mice. The addition of human rabies immunoglobulins (HRIG) to the combination in the second experiment almost completely prevented mortality in the pre-exposure treatment group along with a significant reduction of viral titres in the CNS. Post-exposure treatments also greatly improved survival rates. As part of the combination with immunomodulatory compounds, HRIG had a higher impact on survival than alone. In the third experiment the combination was further supplemented with type-I interferons, ribavirin and favipiravir (T-705). As a blood-brain barrier opener, mannitol was also administered. This treatment was unable to prevent lethal consequences of SHBRV-18 infection; furthermore, it caused toxicity in treated mice, presumably due to interaction among the components. In all experiments, viral loads in the CNS were similar in mice that succumbed to rabies regardless of treatment. According to the findings, inhibitors of detrimental host response to rabies combined with antibodies can be considered among the possible therapeutic and post-exposure options in human rabies cases.
Collapse
Affiliation(s)
- András Marosi
- Department of Microbiology and Infectious Diseases, University of Veterinary Medicine, Hungária krt. 23 - 25, 1143 Budapest, Hungary.
| | - Lucie Dufkova
- Department of Virology, Veterinary Research Institute, Hudcova 70, CZ-62100 Brno, Czech Republic
| | - Barbara Forró
- Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Hungária krt. 21, 1143 Budapest, Hungary
| | - Orsolya Felde
- Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Hungária krt. 21, 1143 Budapest, Hungary
| | - Károly Erdélyi
- National Food Chain Safety Office, Veterinary Diagnostic Directorate, Tábornok u. 2, 1149 Budapest, Hungary
| | - Jana Širmarová
- Department of Virology, Veterinary Research Institute, Hudcova 70, CZ-62100 Brno, Czech Republic
| | - Martin Palus
- Department of Virology, Veterinary Research Institute, Hudcova 70, CZ-62100 Brno, Czech Republic
| | - Václav Hönig
- Department of Virology, Veterinary Research Institute, Hudcova 70, CZ-62100 Brno, Czech Republic
| | - Jiří Salát
- Department of Virology, Veterinary Research Institute, Hudcova 70, CZ-62100 Brno, Czech Republic
| | - Réka Tikos
- Department of Microbiology and Infectious Diseases, University of Veterinary Medicine, Hungária krt. 23 - 25, 1143 Budapest, Hungary
| | - Miklós Gyuranecz
- Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Hungária krt. 21, 1143 Budapest, Hungary
| | - Daniel Růžek
- Department of Virology, Veterinary Research Institute, Hudcova 70, CZ-62100 Brno, Czech Republic; Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branisovska 31, CZ-37005 Ceske Budejovice, Czech Republic
| | - Byron Martina
- Artemis One Health Research Foundation, Delft, The Netherlands
| | - Penelope Koraka
- Viroscience Lab, Erasmus Medical Centre, Wytemaweg 80 3015CN, Rotterdam, The Netherlands
| | - Albert D M E Osterhaus
- Artemis One Health Research Foundation, Delft, The Netherlands; Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Germany
| | - Tamás Bakonyi
- Department of Microbiology and Infectious Diseases, University of Veterinary Medicine, Hungária krt. 23 - 25, 1143 Budapest, Hungary; Viral Zoonoses, Emerging and Vector-Borne Infections Group, Institute of Virology, University of Veterinary Medicine Vienna, Veterinaerplatz 1, 1210 Vienna, Austria
| |
Collapse
|
6
|
Segmentation of the rabies virus genome. Virus Res 2018; 252:68-75. [PMID: 29787783 DOI: 10.1016/j.virusres.2018.05.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 05/17/2018] [Accepted: 05/18/2018] [Indexed: 11/24/2022]
Abstract
We established a system for the recovery of a segmented recombinant rabies virus, the virus genome RNA of which was divided into two parts: segment 1 encoding the nucleoprotein, phosphoprotein, matrix protein, and glycoprotein genes, and segment 2 encoding the large RNA-dependent RNA polymerase gene. The morphology of the segmented recombinant rabies virus was bullet-like in shape with a length of approximately 130 nm, which is shorter than the 200-nm long non-segmented recombinant rabies virus. The segmented recombinant rabies virus was maintained for at least 18 passages. The virus multiplication rate of the segmented recombinant rabies virus was lower than that of the non-segmented recombinant rabies virus during the passages, and the relative amounts of virus genome RNAs for segment 1 and segment 2 differed in the supernatant of the segmented recombinant rabies virus infected cells. These results suggest that the segmented recombinant rabies virus packages either segment 1 or segment 2 into each virus particle. Thus, co-infection with segmented recombinant rabies virus particles packaging segment 1 or segment 2 may be necessary for the production of progeny virus.
Collapse
|
7
|
Singh R, Singh KP, Cherian S, Saminathan M, Kapoor S, Manjunatha Reddy GB, Panda S, Dhama K. Rabies - epidemiology, pathogenesis, public health concerns and advances in diagnosis and control: a comprehensive review. Vet Q 2017. [PMID: 28643547 DOI: 10.1080/01652176.2017.1343516] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Rabies is a zoonotic, fatal and progressive neurological infection caused by rabies virus of the genus Lyssavirus and family Rhabdoviridae. It affects all warm-blooded animals and the disease is prevalent throughout the world and endemic in many countries except in Islands like Australia and Antarctica. Over 60,000 peoples die every year due to rabies, while approximately 15 million people receive rabies post-exposure prophylaxis (PEP) annually. Bite of rabid animals and saliva of infected host are mainly responsible for transmission and wildlife like raccoons, skunks, bats and foxes are main reservoirs for rabies. The incubation period is highly variable from 2 weeks to 6 years (avg. 2-3 months). Though severe neurologic signs and fatal outcome, neuropathological lesions are relatively mild. Rabies virus exploits various mechanisms to evade the host immune responses. Being a major zoonosis, precise and rapid diagnosis is important for early treatment and effective prevention and control measures. Traditional rapid Seller's staining and histopathological methods are still in use for diagnosis of rabies. Direct immunofluoroscent test (dFAT) is gold standard test and most commonly recommended for diagnosis of rabies in fresh brain tissues of dogs by both OIE and WHO. Mouse inoculation test (MIT) and polymerase chain reaction (PCR) are superior and used for routine diagnosis. Vaccination with live attenuated or inactivated viruses, DNA and recombinant vaccines can be done in endemic areas. This review describes in detail about epidemiology, transmission, pathogenesis, advances in diagnosis, vaccination and therapeutic approaches along with appropriate prevention and control strategies.
Collapse
Affiliation(s)
- Rajendra Singh
- a Division of Pathology , ICAR-Indian Veterinary Research Institute , Bareilly , Uttar Pradesh , India
| | - Karam Pal Singh
- b Centre for Animal Disease Research and Diagnosis (CADRAD) , ICAR-Indian Veterinary Research Institute , Bareilly , Uttar Pradesh , India
| | - Susan Cherian
- a Division of Pathology , ICAR-Indian Veterinary Research Institute , Bareilly , Uttar Pradesh , India
| | - Mani Saminathan
- a Division of Pathology , ICAR-Indian Veterinary Research Institute , Bareilly , Uttar Pradesh , India
| | - Sanjay Kapoor
- c Department of Veterinary Microbiology , LLR University of Veterinary and Animal Sciences , Hisar , Haryana , India
| | - G B Manjunatha Reddy
- d ICAR-National Institute of Veterinary Epidemiology and Disease Informatics , Bengaluru , Karnataka , India
| | - Shibani Panda
- a Division of Pathology , ICAR-Indian Veterinary Research Institute , Bareilly , Uttar Pradesh , India
| | - Kuldeep Dhama
- a Division of Pathology , ICAR-Indian Veterinary Research Institute , Bareilly , Uttar Pradesh , India
| |
Collapse
|
8
|
Mesquita LP, Gamon THM, Cuevas SEC, Asano KM, Fahl WDO, Iamamoto K, Scheffer KC, Achkar SM, Zanatto DA, Mori CMC, Maiorka PC, Mori E. A rabies virus vampire bat variant shows increased neuroinvasiveness in mice when compared to a carnivore variant. Arch Virol 2017; 162:3671-3679. [PMID: 28831620 DOI: 10.1007/s00705-017-3530-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 08/08/2017] [Indexed: 12/25/2022]
Abstract
Rabies is one of the most important zoonotic diseases and is caused by several rabies virus (RABV) variants. These variants can exhibit differences in neurovirulence, and few studies have attempted to evaluate the neuroinvasiveness of variants derived from vampire bats and wild carnivores. The aim of this study was to evaluate the neuropathogenesis of infection with two Brazilian RABV street variants (variant 3 and crab-eating fox) in mice. BALB/c mice were inoculated with RABV through the footpad, with the 50% mouse lethal dose (LD50) determined by intracranial inoculation. The morbidity of rabies in mice infected with variant 3 and the crab-eating fox strain was 100% and 50%, respectively, with an incubation period of 7 and 6 days post-inoculation (dpi), respectively. The clinical disease in mice was similar with both strains, and it was characterized initially by weight loss, ruffled fur, hunched posture, and hind limb paralysis progressing to quadriplegia and recumbency at 9 to 12 dpi. Histological lesions within the central nervous system (CNS) characterized by nonsuppurative encephalomyelitis with neuronal degeneration and necrosis were observed in mice infected with variant 3 and those infected with the crab-eating fox variant. However, lesions and the presence of RABV antigen, were more widespread within the CNS of variant-3-infected mice, whereas in crab-eating fox-variant-infected mice, RABV antigens were more restricted to caudal areas of the CNS, such as the spinal cord and brainstem. In conclusion, the results shown here demonstrate that the RABV vampire bat strain (variant 3) has a higher potential for neuroinvasiveness than the carnivore variant.
Collapse
Affiliation(s)
- Leonardo Pereira Mesquita
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, SP, Brazil
| | - Thais Helena Martins Gamon
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, SP, Brazil
| | - Silvia Elena Campusano Cuevas
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, SP, Brazil
| | - Karen Miyuki Asano
- Instituto Pasteur de Sao Paulo, Avenida Paulista 393, São Paulo, SP, 01311-000, Brazil
| | | | - Keila Iamamoto
- Instituto Pasteur de Sao Paulo, Avenida Paulista 393, São Paulo, SP, 01311-000, Brazil
| | - Karin Correa Scheffer
- Instituto Pasteur de Sao Paulo, Avenida Paulista 393, São Paulo, SP, 01311-000, Brazil
| | - Samira Maria Achkar
- Instituto Pasteur de Sao Paulo, Avenida Paulista 393, São Paulo, SP, 01311-000, Brazil
| | - Dennis Albert Zanatto
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, SP, Brazil
| | - Cláudia Madalena Cabrera Mori
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, SP, Brazil
| | - Paulo César Maiorka
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, SP, Brazil
| | - Enio Mori
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of Sao Paulo, São Paulo, SP, Brazil. .,Instituto Pasteur de Sao Paulo, Avenida Paulista 393, São Paulo, SP, 01311-000, Brazil.
| |
Collapse
|
9
|
Yamaoka S, Okada K, Ito N, Okadera K, Mitake H, Nakagawa K, Sugiyama M. Defect of rabies virus phosphoprotein in its interferon-antagonist activity negatively affects viral replication in muscle cells. J Vet Med Sci 2017; 79:1394-1397. [PMID: 28674326 PMCID: PMC5573828 DOI: 10.1292/jvms.17-0054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Attenuated derivative rabies virus Ni-CE replicates in muscle cells less efficiently than
does the parental pathogenic strain Nishigahara. To examine the mechanism underlying the
less efficient replication of Ni-CE, we compared the activities of Ni-CE and Nishigahara
phosphoproteins, viral interferon (IFN) antagonists, to suppress IFN-β promoter activity
in muscle cells and we demonstrated a defect of Ni-CE phosphoprotein in this ability.
Treatment with an IFN-β-neutralizing antibody improved the replication efficiency of Ni-CE
in muscle cells, indicating that produced IFN inhibits Ni-CE replication. The results
indicate the importance of IFN antagonism of rabies virus phosphoprotein for viral
replication in muscle cells.
Collapse
Affiliation(s)
- Satoko Yamaoka
- The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan.,Present address: Department of Molecular Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, U.S.A
| | - Kazuma Okada
- The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Naoto Ito
- The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan.,Laboratory of Zoonotic Diseases, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan.,Gifu Center for Highly Advanced Integration of Nanosciences and Life Sciences (G-CHAIN), Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Kota Okadera
- The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Hiromichi Mitake
- The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Kento Nakagawa
- The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Makoto Sugiyama
- The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan.,Laboratory of Zoonotic Diseases, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| |
Collapse
|
10
|
Kimitsuki K, Yamada K, Shiwa N, Inoue S, Nishizono A, Park CH. Pathological lesions in the central nervous system and peripheral tissues of ddY mice with street rabies virus (1088 strain). J Vet Med Sci 2017; 79:970-978. [PMID: 28428485 PMCID: PMC5487800 DOI: 10.1292/jvms.17-0028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Most studies on rabies virus pathogenesis in animal models have employed fixed rabies
viruses, and the results of those employing street rabies viruses have been inconsistent.
Therefore, to clarify the pathogenesis of street rabies virus (1088 strain) in mice,
106 focus forming units were inoculated into the right hindlimb of
ddY mice (6 weeks, female). At 3 days postinoculation (DPI), mild
inflammation was observed in the hindlimb muscle. At 5 DPI, ganglion cells in the right
lumbosacral spinal dorsal root ganglia showed chromatolysis. Axonal degeneration and
inflammatory cells increased with infection progress in the spinal dorsal horn and dorsal
root ganglia. Right hindlimb paralysis was observed from 7 DPI, which progressed to
quadriparalysis. However, no pathological changes were observed in the ventral horn and
root fibers of the spinal cord. Viral antigen was first detected in the right hindlimb
muscle at 3 DPI, followed by the right lumbosacral dorsal root ganglia, dorsal horn of
spinal cord, left red nuclei, medulla oblongata and cerebral cortex (M1 area) at 5 DPI.
These results suggested that the 1088 virus ascended the lumbosacral spinal cord via
mainly afferent fibers at early stage of infection and moved to cerebral cortex (M1 area)
using descending spinal tract. Additionally, we concluded that significant pathological
changes in mice infected with 1088 strain occur in the sensory tract of the spinal cord;
this selective susceptibility results in clinical features of the disease.
Collapse
Affiliation(s)
- Kazunori Kimitsuki
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University, 23-35-1, Higashi, Towada, Aomori 034-8628, Japan
| | - Kentaro Yamada
- Research Promotion Project, Oita University, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita 879-5593, Japan
| | - Nozomi Shiwa
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University, 23-35-1, Higashi, Towada, Aomori 034-8628, Japan
| | - Satoshi Inoue
- Department of Veterinary Science, National Institute of Infectious Diseases, Toyama 1-23-1, Shinjuku-ku, Tokyo 162-8640 Japan
| | - Akira Nishizono
- Research Promotion Project, Oita University, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita 879-5593, Japan.,Department of Microbiology, Faculty of Medicine, Oita University, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita 879-5593, Japan
| | - Chun-Ho Park
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University, 23-35-1, Higashi, Towada, Aomori 034-8628, Japan
| |
Collapse
|
11
|
Impact of caspase-1/11, -3, -7, or IL-1 β/IL-18 deficiency on rabies virus-induced macrophage cell death and onset of disease. Cell Death Discov 2017; 3:17012. [PMID: 28280602 PMCID: PMC5339016 DOI: 10.1038/cddiscovery.2017.12] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 01/27/2017] [Indexed: 12/17/2022] Open
Abstract
Rabies virus is a highly neurovirulent RNA virus, which causes about 59000 deaths in humans each year. Previously, we described macrophage cytotoxicity upon infection with rabies virus. Here we examined the type of cell death and the role of specific caspases in cell death and disease development upon infection with two laboratory strains of rabies virus: Challenge Virus Standard strain-11 (CVS-11) is highly neurotropic and lethal for mice, while the attenuated Evelyn–Rotnycki–Abelseth (ERA) strain has a broader cell tropism, is non-lethal and has been used as an oral vaccine for animals. Infection of Mf4/4 macrophages with both strains led to caspase-1 activation and IL-1β and IL-18 production, as well as activation of caspases-3, -7, -8, and -9. Moreover, absence of caspase-3, but not of caspase-1 and -11 or -7, partially inhibited virus-induced cell death of bone marrow-derived macrophages. Intranasal inoculation with CVS-11 of mice deficient for either caspase-1 and -11 or -7 or both IL-1β and IL-18 led to general brain infection and lethal disease similar to wild-type mice. Deficiency of caspase-3, on the other hand, significantly delayed the onset of disease, but did not prevent final lethal outcome. Interestingly, deficiency of caspase-1/11, the key executioner of pyroptosis, aggravated disease severity caused by ERA virus, whereas wild-type mice or mice deficient for either caspase-3, -7, or both IL-1β and IL-18 presented the typical mild symptoms associated with ERA virus. In conclusion, rabies virus infection of macrophages induces caspase-1- and caspase-3-dependent cell death. In vivo caspase-1/11 and caspase-3 differently affect disease development in response to infection with the attenuated ERA strain or the virulent CVS-11 strain, respectively. Inflammatory caspases seem to control attenuated rabies virus infection, while caspase-3 aggravates virulent rabies virus infection.
Collapse
|
12
|
Mahadevan A, Suja MS, Mani RS, Shankar SK. Perspectives in Diagnosis and Treatment of Rabies Viral Encephalitis: Insights from Pathogenesis. Neurotherapeutics 2016; 13:477-92. [PMID: 27324391 PMCID: PMC4965414 DOI: 10.1007/s13311-016-0452-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Rabies viral encephalitis, though one of the oldest recognized infectious disease of humans, remains an incurable, fatal encephalomyelitis, despite advances in understanding of its pathobiology. Advances in science have led us on the trail of the virus in the host, but the sanctuaries in which the virus remains hidden for its survival are unknown. Insights into host-pathogen interactions have facilitated evolving immunologic therapeutic strategies, though we are far from a cure. Most of the present-day knowledge has evolved from in vitro studies using fixed (attenuated) laboratory strains that may not be applicable in the clinical setting. Much remains to be unraveled about this elusive virus. This review attempts to re-examine the current advances in understanding of the pathobiology of the rabies virus that modulate the diagnosis, treatment, and prevention of this fatal disease.
Collapse
Affiliation(s)
- Anita Mahadevan
- Department of Neuropathology, National Institute of Mental Health & Neurosciences, Bangalore, 560 029, India.
| | - M S Suja
- Department of Neuropathology, National Institute of Mental Health & Neurosciences, Bangalore, 560 029, India
| | - Reeta S Mani
- Department of Neurovirology, National Institute of Mental Health & Neurosciences, Bangalore, 560 029, India
| | - Susarala K Shankar
- Department of Neuropathology, National Institute of Mental Health & Neurosciences, Bangalore, 560 029, India
| |
Collapse
|
13
|
Park JS, Um J, Choi YK, Lee YS, Ju YR, Kim SY. Immunostained plaque assay for detection and titration of rabies virus infectivity. J Virol Methods 2016; 228:21-5. [DOI: 10.1016/j.jviromet.2015.10.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 10/01/2015] [Accepted: 10/29/2015] [Indexed: 10/22/2022]
|
14
|
Watson NB, Schneider KM, Massa PT. SHP-1-dependent macrophage differentiation exacerbates virus-induced myositis. THE JOURNAL OF IMMUNOLOGY 2015; 194:2796-809. [PMID: 25681345 DOI: 10.4049/jimmunol.1402210] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Virus-induced myositis is an emerging global affliction that remains poorly characterized with few treatment options. Moreover, muscle-tropic viruses often spread to the CNS, causing dramatically increased morbidity. Therefore, there is an urgent need to explore genetic factors involved in this class of human disease. This report investigates critical innate immune pathways affecting murine virus-induced myositis. Of particular importance, the key immune regulator src homology region 2 domain-containing phosphatase 1 (SHP-1), which normally suppresses macrophage-mediated inflammation, is a major factor in promoting clinical disease in muscle. We show that Theiler's murine encephalomyelitis virus (TMEV) infection of skeletal myofibers induces inflammation and subsequent dystrophic calcification, with loss of ambulation in wild-type (WT) mice. Surprisingly, although similar extensive myofiber infection and inflammation are observed in SHP-1(-/-) mice, these mice neither accumulate dead calcified myofibers nor lose ambulation. Macrophages were the predominant effector cells infiltrating WT and SHP-1(-/-) muscle, and an increased infiltration of immature monocytes/macrophages correlated with an absence of clinical disease in SHP-1(-/-) mice, whereas mature M1-like macrophages corresponded with increased myofiber degeneration in WT mice. Furthermore, blocking SHP-1 activation in WT macrophages blocked virus-induced myofiber degeneration, and pharmacologic ablation of macrophages inhibited muscle calcification in TMEV-infected WT animals. These data suggest that, following TMEV infection of muscle, SHP-1 promotes M1 differentiation of infiltrating macrophages, and these inflammatory macrophages are likely involved in damaging muscle fibers. These findings reveal a pathological role for SHP-1 in promoting inflammatory macrophage differentiation and myofiber damage in virus-infected skeletal muscle, thus identifying SHP-1 and M1 macrophages as essential mediators of virus-induced myopathy.
Collapse
Affiliation(s)
- Neva B Watson
- Department of Microbiology and Immunology, State University of New York Upstate Medical University, Syracuse, NY 13210; and
| | - Karin M Schneider
- Department of Microbiology and Immunology, State University of New York Upstate Medical University, Syracuse, NY 13210; and
| | - Paul T Massa
- Department of Microbiology and Immunology, State University of New York Upstate Medical University, Syracuse, NY 13210; and Department of Neurology, State University of New York Upstate Medical University, Syracuse, NY 13210
| |
Collapse
|
15
|
Abstract
Rabies virus (RABV), which is transmitted via a bite wound caused by a rabid animal, infects peripheral nerves and then spreads to the central nervous system (CNS) before causing severe neurological symptoms and death in the infected individual. Despite the importance of this ability of the virus to spread from a peripheral site to the CNS (neuroinvasiveness) in the pathogenesis of rabies, little is known about the mechanism underlying the neuroinvasiveness of RABV. In this study, to obtain insights into the mechanism, we conducted comparative analysis of two fixed RABV strains, Nishigahara and the derivative strain Ni-CE, which cause lethal and asymptomatic infections, respectively, in mice after intramuscular inoculation. Examination of a series of chimeric viruses harboring the respective genes from Nishigahara in the genetic background of Ni-CE revealed that the Nishigahara phosphoprotein (P) gene plays a major role in the neuroinvasiveness by mediating infection of peripheral nerves. The results obtained from both in vivo and in vitro experiments strongly suggested that the Nishigahara P gene, but not the Ni-CE P gene, is important for stable viral replication in muscle cells. Further investigation based on the previous finding that RABV phosphoprotein counteracts the host interferon (IFN) system demonstrated that the Nishigahara P gene, but not the Ni-CE P gene, functions to suppress expression of the beta interferon (IFN-β) gene (Ifn-β) and IFN-stimulated genes in muscle cells. In conclusion, we provide the first data strongly suggesting that RABV phosphoprotein assists viral replication in muscle cells by counteracting the host IFN system and, consequently, enhances infection of peripheral nerves.
Collapse
|
16
|
Gomme EA, Wirblich C, Addya S, Rall GF, Schnell MJ. Immune clearance of attenuated rabies virus results in neuronal survival with altered gene expression. PLoS Pathog 2012; 8:e1002971. [PMID: 23071441 PMCID: PMC3469654 DOI: 10.1371/journal.ppat.1002971] [Citation(s) in RCA: 43] [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: 03/28/2012] [Accepted: 08/30/2012] [Indexed: 01/23/2023] Open
Abstract
Rabies virus (RABV) is a highly neurotropic pathogen that typically leads to mortality of infected animals and humans. The precise etiology of rabies neuropathogenesis is unknown, though it is hypothesized to be due either to neuronal death or dysfunction. Analysis of human brains post-mortem reveals surprisingly little tissue damage and neuropathology considering the dramatic clinical symptomology, supporting the neuronal dysfunction model. However, whether or not neurons survive infection and clearance and, provided they do, whether they are functionally restored to their pre-infection phenotype has not been determined in vivo for RABV, or any neurotropic virus. This is due, in part, to the absence of a permanent “mark” on once-infected cells that allow their identification long after viral clearance. Our approach to study the survival and integrity of RABV-infected neurons was to infect Cre reporter mice with recombinant RABV expressing Cre-recombinase (RABV-Cre) to switch neurons constitutively expressing tdTomato (red) to expression of a Cre-inducible EGFP (green), permanently marking neurons that had been infected in vivo. We used fluorescence microscopy and quantitative real-time PCR to measure the survival of neurons after viral clearance; we found that the vast majority of RABV-infected neurons survive both infection and immunological clearance. We were able to isolate these previously infected neurons by flow cytometry and assay their gene expression profiles compared to uninfected cells. We observed transcriptional changes in these “cured” neurons, predictive of decreased neurite growth and dysregulated microtubule dynamics. This suggests that viral clearance, though allowing for survival of neurons, may not restore them to their pre-infection functionality. Our data provide a proof-of-principle foundation to re-evaluate the etiology of human central nervous system diseases of unknown etiology: viruses may trigger permanent neuronal damage that can persist or progress in the absence of sustained viral antigen. Rabies is an ancient and fatal neurological disease of animals and humans, caused by infection of the central nervous system (CNS) with Rabies virus (RABV). It is estimated that nearly 55,000 human RABV fatalities occur each year, though this number is likely much higher due to unreported exposures or failure of diagnosis. No treatment has been identified to cure disease after onset of symptoms. Neurovirologists still do not know the cause of rabies' dramatic symptoms and fatality, though it is thought to be due to neuronal loss or dysfunction. Here, we use a novel approach to permanently and genetically tag infected cells so that they can be identified after the infection has been cleared. This allowed us to define neuronal survival time following infection, and to assess neuronal function through gene expression analysis. We found that RABV infection does not lead to loss of neurons, but rather induces a permanent change in gene expression that may be related to the ability of RABV to cause permanent CNS disease. Our study provides evidence that viral infection of the brain can initiate long-term changes that may have consequences for nervous system health, even after the virus has been cleared from the CNS.
Collapse
Affiliation(s)
- Emily A. Gomme
- Department of Microbiology and Immunology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Christoph Wirblich
- Department of Microbiology and Immunology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Sankar Addya
- Kimmel Cancer Center, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Glenn F. Rall
- Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
| | - Matthias J. Schnell
- Department of Microbiology and Immunology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
- Kimmel Cancer Center, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
- Jefferson Vaccine Center, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
- * E-mail:
| |
Collapse
|
17
|
Abstract
Rabies virus (RABV) is a strictly neurotropic virus that slowly propagates in the nervous system (NS) of the infected host from the site of entry (usually due to a bite) up to the site of exit (salivary glands). Successful achievement of the virus cycle relies on the preservation of the neuronal network. Once RABV has entered the NS, its progression is not interrupted either by destruction of the infected neurons or by the immune response, which are major host mechanisms for combating viral infection. RABV has developed two main mechanisms to escape the host defenses: (1) its ability to kill protective migrating T cells and (2) its ability to sneak into the NS without triggering apoptosis of the infected neurons and preserving the integrity of neurites.
Collapse
Affiliation(s)
- Monique Lafon
- Unité de Neuroimmunologie Virale, Département de Virologie, Institut Pasteur, Paris, France
| |
Collapse
|
18
|
de Sousa AA, Reis R, Bento-Torres J, Trévia N, Lins NADA, Passos A, Santos Z, Diniz JAP, Vasconcelos PFDC, Cunningham C, Perry VH, Picanço Diniz CW. Influence of enriched environment on viral encephalitis outcomes: behavioral and neuropathological changes in albino Swiss mice. PLoS One 2011; 6:e15597. [PMID: 21264301 PMCID: PMC3019164 DOI: 10.1371/journal.pone.0015597] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Accepted: 11/13/2010] [Indexed: 11/25/2022] Open
Abstract
An enriched environment has previously been described as enhancing natural killer cell activity of recognizing and killing virally infected cells. However, the effects of environmental enrichment on behavioral changes in relation to virus clearance and the neuropathology of encephalitis have not been studied in detail. We tested the hypothesis that environmental enrichment leads to less CNS neuroinvasion and/or more rapid viral clearance in association with T cells without neuronal damage. Stereology-based estimates of activated microglia perineuronal nets and neurons in CA3 were correlated with behavioral changes in the Piry rhabdovirus model of encephalitis in the albino Swiss mouse. Two-month-old female mice maintained in impoverished (IE) or enriched environments (EE) for 3 months were behaviorally tested. After the tests, an equal volume of Piry virus (IEPy, EEPy)-infected or normal brain homogenates were nasally instilled. Eight days post-instillation (dpi), when behavioral changes became apparent, brains were fixed and processed to detect viral antigens, activated microglia, perineuronal nets, and T lymphocytes by immuno- or histochemical reactions. At 20 or 40 dpi, the remaining animals were behaviorally tested and processed for the same markers. In IEPy mice, burrowing activity decreased and recovered earlier (8–10 dpi) than open field (20–40 dpi) but remained unaltered in the EEPy group. EEPy mice presented higher T-cell infiltration, less CNS cell infection by the virus and/or faster virus clearance, less microgliosis, and less damage to the extracellular matrix than IEPy. In both EEPy and IEPy animals, CA3 neuronal number remained unaltered. The results suggest that an enriched environment promotes a more effective immune response to clear CNS virus and not at the cost of CNS damage.
Collapse
Affiliation(s)
- Aline Andrade de Sousa
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
| | - Renata Reis
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
| | - João Bento-Torres
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
| | - Nonata Trévia
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
| | - Nara Alves de Almeida Lins
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
| | - Aline Passos
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
| | - Zaire Santos
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
| | | | - Pedro Fernando da Costa Vasconcelos
- Instituto Evandro Chagas (IEC), Departamento de Arbovirologia e Febres Hemorrágicas, Ananindeua, Brazil
- Departamento de Patologia, Universidade do Estado do Pará, Belém, Brazil
| | - Colm Cunningham
- School of Biochemistry and Immunology, Trinity College Institute of Neuroscience, Trinity College, Dublin, Ireland
| | - Victor Hugh Perry
- School of Biological Sciences, University of Southampton, Southampton, United Kingdom
| | - Cristovam Wanderley Picanço Diniz
- Universidade Federal do Pará (UFPA), Instituto de Ciências Biológicas, Laboratório de Investigações em Neurodegeneração e Infecção, Hospital Universitário João de Barros Barreto, Belém, Brazil
- * E-mail:
| |
Collapse
|
19
|
KOJIMA D, PARK CH, TSUJIKAWA S, KOHARA K, HATAI H, OYAMAD T, NOGUCHI A, INOUE S. Lesions of the Central Nervous System Induced by Intracerebral Inoculation of BALB/c Mice with Rabies Virus (CVS-11). J Vet Med Sci 2010; 72:1011-6. [DOI: 10.1292/jvms.09-0550] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Daisuke KOJIMA
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
| | - Chun-Ho PARK
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
| | - Shintarou TSUJIKAWA
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
| | - Keiko KOHARA
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
| | - Hitoshi HATAI
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
| | - Toshifumi OYAMAD
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
| | - Akira NOGUCHI
- Department of Veterinary Science, National Institute of Infectious Diseases
| | - Satoshi INOUE
- Department of Veterinary Science, National Institute of Infectious Diseases
| |
Collapse
|
20
|
Rossiter JP, Hsu L, Jackson AC. Selective vulnerability of dorsal root ganglia neurons in experimental rabies after peripheral inoculation of CVS-11 in adult mice. Acta Neuropathol 2009; 118:249-59. [PMID: 19252919 DOI: 10.1007/s00401-009-0503-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 02/08/2009] [Accepted: 02/16/2009] [Indexed: 12/25/2022]
Abstract
The involvement of dorsal root ganglia was studied in an in vivo model of experimental rabies virus infection using the challenge virus standard (CVS-11) strain. Dorsal root ganglia neurons infected with CVS in vitro show prolonged survival and few morphological changes, and are commonly used to study the infection. It has been established that after peripheral inoculation of mice with CVS the brain and spinal cord show relatively few neurodegenerative changes, but detailed studies of pathological changes in dorsal root ganglia have not previously been performed in this in vivo experimental model. In this study, adult ICR mice were inoculated in the right hindlimb footpad with CVS. Spinal cords and dorsal root ganglia were evaluated at serial time points for histopathological and ultrastructural changes and for biochemical markers of cell death. Light microscopy showed multifocal mononuclear inflammatory cell infiltrates in the sensory ganglia and a spectrum of degenerative neuronal changes. Ultrastructural changes in gangliocytes included features characteristic of the axotomy response, the appearance of numerous autophagic compartments, and aggregation of intermediate filaments, while the neurons retained relatively intact mitochondria and plasma membranes. Later in the process, there were more extensive degenerative neuronal changes without typical features of either apoptosis or necrosis. The degree of degenerative neuronal changes in gangliocytes contrasts with observations in CNS neurons in experimental rabies. Hence, gangliocytes exhibit selective vulnerability in this animal model. This contrasts markedly with the fact that they are, unlike CNS neurons, highly permissive to CVS infection in vitro. Further study is needed to determine mechanisms for this selective vulnerability, which will give us a better understanding of the pathogenesis of rabies.
Collapse
|
21
|
Kojima D, Park CH, Satoh Y, Inoue S, Noguchi A, Oyamada T. Pathology of the spinal cord of C57BL/6J mice infected with rabies virus (CVS-11 strain). J Vet Med Sci 2009; 71:319-24. [PMID: 19346700 DOI: 10.1292/jvms.71.319] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Fixed rabies viruses (CVS-11 strain) were inoculated intramuscularly to C57BL/6J mice, and the pathomorphological changes of the spinal cord including dorsal root spinal ganglion cells were investigated. At 4 days postinoculation (PI), viral antigens were first detected in the spinal neurons and dorsal root spinal ganglion cells without producing morphological changes. At 5 days PI, mild infiltration of lymphocytes was observed around the central canal, small blood vessels and leptomeninges. Cells positive to anti-Iba1 and anti-GFAP antibodies increased significantly from 3 to 5 days PI, respectively. Microglia changed their morphological forms to be ramified or amoeboid, and astroglia extended their cytoplasm from the leptomeninges to the parenchyma. At 7 days PI, apoptotic cells were found in the spinal cord and dorsal root spinal ganglion using TUNEL. We confirmed that most of T lymphocytes and a minority of microglial cells underwent apoptosis, using a combination of TUNEL and immunostaining with antibodies to viral phosphoprotein, CD3, Iba1 and GFAP. On the other hand, astroglial cells and virus-infected nerve cells were negative against TUNEL and cleaved caspase-3 antibody. These findings indicate that T lymphocytes and microglial cells died by apoptosis, whereas virus-infected nerve cells died by necrosis. This was accompanied by increased numbers and morphological changes of glial cells associated with the pathogenesis of CVS-11 in the C57BL/6J mouse.
Collapse
Affiliation(s)
- Daisuke Kojima
- Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University, Towada, Aomori, Japan
| | | | | | | | | | | |
Collapse
|
22
|
Abstract
Apoptosis is associated with virus-induced human diseases of the central nervous system, heart and liver, and causes substantial morbidity and mortality. Although virus-induced apoptosis is well characterized in individual cells in cell culture, virus-induced apoptosis in vivo and the role of apoptosis in virus-induced disease is not well established. This review focuses on animal models of virus-induced diseases of the central nervous system, heart and liver that provide insights into the role of apoptosis in pathogenesis, the pathways involved and the potential therapeutic implications.
Collapse
Affiliation(s)
- Penny Clarke
- Department of Neurology, University of Colorado, Denver Health Sciences Programs, Anschutz Medical Campus, Aurora, Colorado 80045, USA.
| | | |
Collapse
|
23
|
Tsunoda I. Axonal degeneration as a self-destructive defense mechanism against neurotropic virus infection. Future Virol 2008; 3:579-593. [PMID: 19079794 DOI: 10.2217/17460794.3.6.579] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Theiler's murine encephalomyelitis virus (TMEV) and other neurotropic virus infections result in degeneration of each component of the neuron: apoptosis of the cell body, axonal (Wallerian) degeneration, and dendritic and synaptic pathology. In general, axonal degeneration is detrimental for hosts. However, axonal degeneration can be beneficial in the case of infection with neurotropic viruses that spread in the CNS using axonal transport. C57BL/Wld(S) (Wld(S), Wallerian degeneration slow mutant) mice are protected from axonal degeneration. Wld(S) mice infected with the neurovirulent GDVII strain of TMEV are more resistant to virus infection than wild-type mice, suggesting that axonal preservation contributes to the resistance. By contrast, infection with the less virulent Daniels strain of TMEV results in high levels of virus propagation in the CNS, suggesting that prolonged survival of axons in Wld(S) mice favors virus spread. Thus, axonal degeneration might be a beneficial self-destruct mechanism that limits the spread of neurotropic viruses, in the case of less virulent virus infection. We hypothesize that neurons use 'built-in' self-destruct protection machinery (compartmental neurodegeneration) against neurotropic virus infection, since the CNS is an immunologically privileged site. Early induction of apoptosis in the neuronal cell body limits virus replication. Wallerian degeneration of the axon prevents axonal transport of virus. Dendritic and synaptic degeneration blocks virus transmission at synapses. Thus, the balance between neurodegeneration and virus propagation may be taken into account in the future design of neuroprotective therapy.
Collapse
Affiliation(s)
- Ikuo Tsunoda
- Department of Pathology, Division of Cell Biology & Immunology, University of Utah School of Medicine, 30 North 1900 East, MREB, Room 218, Salt Lake City, Utah 84132, USA
| |
Collapse
|