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Martínez IZ, Pérez-Martínez C, Salinas LM, Juste RA, García Marín JF, Balseiro A. Phenotypic Characterization of Encephalitis and Immune Response in the Brains of Lambs Experimentally Infected with Spanish Goat Encephalitis Virus. Animals (Basel) 2020; 10:ani10081373. [PMID: 32784781 PMCID: PMC7459603 DOI: 10.3390/ani10081373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 07/30/2020] [Accepted: 08/05/2020] [Indexed: 11/20/2022] Open
Abstract
Simple Summary This article studies the local immune response in the central nervous system (CNS) in lambs experimentally infected with Spanish goat encephalitis virus. CNS sections were immunostained to detect microglia, astrocytes, T lymphocytes, and B lymphocytes. In glial foci and perivascular cuffing areas, microglia were the most abundant cell type (45.4% of immunostained cells), followed by T lymphocytes (18.6%) and B lymphocytes (4.4%). Reactive astrogliosis occurred to a greater extent in the lumbosacral spinal cord. Thalamus, hypothalamus, corpus callosum, and medulla oblongata cord contained the largest areas occupied by glial foci. Lesions were more severe in lambs than in goats. Abstract Spanish goat encephalitis virus (SGEV), a novel subtype of tick-borne flavivirus closely related to louping ill virus, causes a neurological disease in experimentally infected goats and lambs. Here, the distribution of microglia, T and B lymphocytes, and astrocytes was determined in the encephalon and spinal cord of eight Assaf lambs subcutaneously infected with SGEV. Cells were identified based on immunohistochemical staining against Iba1 (microglia), CD3 (T lymphocytes), CD20 (B lymphocytes), and glial fibrillary acidic protein (astrocytes). In glial foci and perivascular cuffing areas, microglia were the most abundant cell type (45.4% of immunostained cells), followed by T lymphocytes (18.6%) and B lymphocytes (4.4%). Thalamus, hypothalamus, corpus callosum, and medulla oblongata contained the largest areas occupied by glial foci. Reactive astrogliosis occurred to a greater extent in the lumbosacral spinal cord than in other regions of the central nervous system. Lesions were more frequent on the side of the animal experimentally infected with the virus. Lesions were more severe in lambs than in goats, suggesting that lambs may be more susceptible to SGEV, which may be due to species differences or to interindividual differences in the immune response, rather than to differences in the relative proportions of immune cells. Larger studies that monitor natural or experimental infections may help clarify local immune responses to this flavivirus subtype in the central nervous system.
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Affiliation(s)
- Ileana Z. Martínez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, 24006 León, Spain; (I.Z.M.); (C.P.-M.); (L.M.S.); (J.F.G.M.)
- Universidad Popular Autónoma del Estado de Puebla, UPAEP Universidad, Puebla 72410, Mexico
| | - Claudia Pérez-Martínez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, 24006 León, Spain; (I.Z.M.); (C.P.-M.); (L.M.S.); (J.F.G.M.)
| | - Luis M. Salinas
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, 24006 León, Spain; (I.Z.M.); (C.P.-M.); (L.M.S.); (J.F.G.M.)
- Universidad Internacional Antonio de Valdivieso, UNIAV, 47000 Rivas, Nicaragua
| | - Ramón A. Juste
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, 48160 Derio, Bizkaia, Spain;
| | - Juan F. García Marín
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, 24006 León, Spain; (I.Z.M.); (C.P.-M.); (L.M.S.); (J.F.G.M.)
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña, CSIC-Universidad de León, Finca Marzanas, Grulleros, 24346 León, Spain
| | - Ana Balseiro
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, 24006 León, Spain; (I.Z.M.); (C.P.-M.); (L.M.S.); (J.F.G.M.)
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña, CSIC-Universidad de León, Finca Marzanas, Grulleros, 24346 León, Spain
- Correspondence:
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Martínez IZ, Pérez-Martínez C, Salinas LM, García-Marín JF, Juste RA, Balseiro A. Phenotypic characterization of encephalitis in the brains of goats experimentally infected with Spanish Goat Encephalitis Virus. Vet Immunol Immunopathol 2019; 220:109978. [PMID: 31821945 DOI: 10.1016/j.vetimm.2019.109978] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 11/10/2019] [Accepted: 11/13/2019] [Indexed: 10/25/2022]
Abstract
Spanish goat encephalitis virus (SGEV) is a novel tick-borne flavivirus subtype, closely related to the flavivirus louping ill virus (LIV). SGEV caused a severe, acute and mortal neurological disease outbreak in northern Spain in a goat herd. In order to characterize the cell population in lesions and to determine the distribution of the inflammatory cells, central nervous system (CNS) samples of nine female Alpine goats challenged subcutaneously with SGEV over the right thorax behind the elbow were evaluated using immunohistochemistry (microglia-Iba1, T lymphocytes-CD3, B lymphocytes-CD20 and astrocytes-GFAP). The number of microglia (37.8 %) and T lymphocytes (21.5 %) was greater than the number of B lymphocytes (16.8 %). Goats were classified into clusters based on the severity of histological lesions in CNS (A-mild to moderate lesions and B-severe lesions). Microglia was significantly more abundant than T and B lymphocytes in cluster B (severe lesions). The total area occupied by glial foci revealed that medulla oblongata and spinal cord were the most affected tissues. Astrogliosis (GFAP+) was present in the majority of the CNS sections being near to the pial surface. The lesion predominance on the right side of the medulla oblongata, which could be associated to the site of challenge suggestive of neurotropic route was also statistically confirmed. Results suggest that the cellular immune response would be the most important response to the SGEV infection.
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Affiliation(s)
- Ileana Z Martínez
- Universidad de León, Campus de Vegazana, León, Spain; Universidad Popular Autónoma del Estado de Puebla, UPAEP Universidad, Puebla, Mexico.
| | | | - Luis M Salinas
- Universidad de León, Campus de Vegazana, León, Spain; Universidad Internacional Antonio de Valdivieso, UNIAV, Rivas, Nicaragua
| | | | - Ramón A Juste
- Centro de Biotecnología, Servicio Regional de Investigación y Desarrollo Agroalimentario, SERIDA, Gijón, Asturias, Spain
| | - Ana Balseiro
- Universidad de León, Campus de Vegazana, León, Spain; Centro de Biotecnología, Servicio Regional de Investigación y Desarrollo Agroalimentario, SERIDA, Gijón, Asturias, Spain
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Salinas LM, Casais R, García Marín JF, Dalton KP, Royo LJ, Del Cerro A, Gayo E, Dagleish MP, Juste RA, Balseiro A. Lambs are Susceptible to Experimental Challenge with Spanish Goat Encephalitis Virus. J Comp Pathol 2017; 156:400-408. [PMID: 28433396 DOI: 10.1016/j.jcpa.2017.03.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 03/08/2017] [Accepted: 03/17/2017] [Indexed: 11/16/2022]
Abstract
Spanish goat encephalitis virus (SGEV) is a member of the genus Flavivirus, family Flaviviridae, and causes encephalomyelitis in goats. The aim of this study was to determine whether sheep are susceptible to experimental challenge with SGEV by two different routes. The results show that SGEV can infect sheep by both the subcutaneous and intravenous routes, resulting in neurological clinical disease with extensive and severe histological lesions in the central nervous system. Lambs challenged subcutaneously developed more severe lesions on the ipsilateral side of the brain, but the lesion morphology was similar irrespective of the route of challenge. The clinical presentation, pathogenesis, lesion morphology and distribution shows that SGEV is very similar to louping ill virus (LIV) and therefore any disease control plan must take into account any host species and SGEV vectors as potential reservoirs. Furthermore, discriminatory diagnostics need to be applied to any sheep or goat suspected of disease due to any flavivirus in areas where SGEV and LIV co-exist.
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Affiliation(s)
- L M Salinas
- Facultad de Veterinaria, Universidad de León, Campus de Vegazana, León, Spain
| | - R Casais
- SERIDA, Servicio Regional de Investigación y Desarrollo Agroalimentario, Centro de Biotecnología Animal, Gijón, Asturias, Spain
| | - J F García Marín
- Facultad de Veterinaria, Universidad de León, Campus de Vegazana, León, Spain
| | - K P Dalton
- Instituto Universitario de Biotecnología de Asturias, Departamento de Bioquímica y Biología Molecular, Universidad de Oviedo, Campus El Cristo, Oviedo, Asturias, Spain
| | - L J Royo
- SERIDA, Servicio Regional de Investigación y Desarrollo Agroalimentario, Centro de Biotecnología Animal, Gijón, Asturias, Spain
| | - A Del Cerro
- SERIDA, Servicio Regional de Investigación y Desarrollo Agroalimentario, Centro de Biotecnología Animal, Gijón, Asturias, Spain
| | - E Gayo
- Facultad de Veterinaria, Universidad de León, Campus de Vegazana, León, Spain
| | - M P Dagleish
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Near Edinburgh, Scotland, UK.
| | - R A Juste
- SERIDA, Servicio Regional de Investigación y Desarrollo Agroalimentario, Centro de Biotecnología Animal, Gijón, Asturias, Spain
| | - A Balseiro
- SERIDA, Servicio Regional de Investigación y Desarrollo Agroalimentario, Centro de Biotecnología Animal, Gijón, Asturias, Spain
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