2014-12-112014-12-112014-10-03SOUSA, Aline Andrade de. Influências do envelhecimento e do ambiente sobre a progressão da encefalite experimental por arbovírus Piry em modelo murino: mudanças morfológicas microgliais e alterações comportamentais. 2014. 113 f. Tese (Doutorado) – Universidade Federal do Pará, Instituto de Ciências Biológicas, Belém, 2014. Programa de Pós-Graduação em Neurociências e Biologia Celular.https://repositorio.ufpa.br/handle/2011/6148Environmental enrichment and aging effects on behavioral and microglial morphological changes were investigated in a murine model of sub-lethal arbovirus encephalitis. To that end two-months-old female albino Swiss mice were raised in impoverished (IE) or in enriched environments (EE) during 6 (young - Y) or 16 (aged - A) months. After behavioral tests, Y and A mice were nasally instilled with an equal volume of Piry virus infected (Py) or normal brain homogenates. Eight days post-infection (DPI), when behavioral tests first revealed sickness changes, mice brains sections were immunoreacted with anti-IBA1 and anti-Piry virus antibodies. At 20 and 40 dpi, the remaining infected animals were behaviorally re-tested, and processed for the same markers. In infected young mice from impoverished environment (IYPy), burrowing activity decreased and recovered earlier (8–10 dpi) than open field activity (20–40 dpi) but remained unaltered in age-matched mice from enriched environment (EYPy). In contrast, aged infected mice, both from enriched (EAPy) and impoverished (IAPy) environments, reduced significantly burrowing activity at all-time windows. Piry virus encephalitis induced transitory olfactory losses in IYPy and EYPy but permanent in IAPy and EAPy. Piry virus antigens immunolabeling reached a peak in CNS parenchyma at 5 and 6dpi and disappeared at 8dpi. All microglia three-dimensional reconstructions were done at 8dpi. Microglial changes were significantly more severe in young adult than in aged mice but EY mice seem to recover to the microglial homeostatic morphology earlier than IY. EE beneficial effects were smaller in aged mice.porAcesso AbertoEncefalite viralVírus PiryEnvelhecimentoAlterações morfológicasMicrogliaArbovírusTeseCNPQ::CIENCIAS BIOLOGICAS::MORFOLOGIA