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Influence of enriched environment on viral encephalitis outcomes: behavioral and neuropathological changes in albino Swiss mice

de Sousa, Aline Andrade, Reis, Renata, Bento-Torres, João, Trévia, Nonata, Lins, Nara Alves de Almeida, Passos, Aline, Santos, Zaire, Diniz, José Antonio Picanço, Vasconcelos, Pedro Fernando da Costa, Cunningham, Colm, Perry, Victor Hugh and Picanço Diniz, Cristovam Wanderley (2011) Influence of enriched environment on viral encephalitis outcomes: behavioral and neuropathological changes in albino Swiss mice PLoS ONE, 6, (1), e15597. (doi:10.1371/journal.pone.0015597).

Record type: Article


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

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Published date: January 2011


Local EPrints ID: 180153
ISSN: 1932-6203
PURE UUID: 0b332f86-f106-4eeb-99fa-e295eb95fdfd

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Date deposited: 06 Apr 2011 10:49
Last modified: 18 Jul 2017 12:01

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Author: Aline Andrade de Sousa
Author: Renata Reis
Author: João Bento-Torres
Author: Nonata Trévia
Author: Nara Alves de Almeida Lins
Author: Aline Passos
Author: Zaire Santos
Author: José Antonio Picanço Diniz
Author: Pedro Fernando da Costa Vasconcelos
Author: Colm Cunningham
Author: Cristovam Wanderley Picanço Diniz

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