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Limbic Encephalitis Brain Damage Induced by Cocal Virus in Adult Mice Is Reduced by Environmental Enrichment: Neuropathological and Behavioral Studies

Priscilla dos Santos Lieuthier Freitas, Ana Victória de Lima Lima, Karina Glazianne Barbosa Carvalho, Tatyane da Silva Cabral, Alexandre Maia de Farias, Ana Paula Drummond Rodrigues, Daniel Guerreiro Diniz, Cristovam Wanderley Picanço Diniz, José Antônio Picanço Diniz Júnior
2020 Viruses  

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We previously demonstrated, using the Piry virus model, that environmental enrichment promotes higher T-cell infiltration, fewer microglial changes, and faster central nervous system (CNS) virus clearance in adult mice. However, little is known about disease progression, behavioral changes, CNS cytokine concentration, and neuropathology in limbic encephalitis in experimental models. Using Cocal virus, we infected C57Bl6 adult mice and studied the neuroanatomical distribution of viral antigens
more » ... correlation with the microglial morphological response, measured the CNS cytokine concentration, and assessed behavioral changes. C57Bl6 adult mice were maintained in an impoverished environment (IE) or enriched environment (EE) for four months and then subjected to the open field test. Afterwards, an equal volume of normal or virus-infected brain homogenate was nasally instilled. The brains were processed to detect viral antigens and microglial morphological changes using selective immunolabeling. We demonstrated earlier significant weight loss and higher mortality in IE mice. Additionally, behavioral analysis revealed a significant influence of the environment on locomotor and exploratory activity that was associated with less neuroinvasion and a reduced microglial response. Thus, environmental enrichment was associated with a more effective immune response in a mouse model of limbic encephalitis, allowing faster viral clearance/decreased viral dissemination, reduced disease progression, and less CNS damage.
doi:10.3390/v13010048 pmid:33396704 fatcat:oi2j2ezdvjgltisvutixnyxrcm
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Priscilla dos Santos Lieuthier Freitas, Ana Victória de Lima Lima, Karina Glazianne Barbosa Carvalho, Tatyane da Silva Cabral, Alexandre Maia de Farias, Ana Paula Drummond Rodrigues, Daniel Guerreiro Diniz, Cristovam Wanderley Picanço Diniz, José Antônio Picanço Diniz Júnior. "Limbic Encephalitis Brain Damage Induced by Cocal Virus in Adult Mice Is Reduced by Environmental Enrichment: Neuropathological and Behavioral Studies." Viruses 13.1 (2020) 48