Early and late neuropathological features of meningoencephalitis associated with Maraba virus infection
Farias, Alexandre Maia de
Lima, Camila Mendes de
Freitas, Priscilla dos Santos Lieuthier
Diniz, Daniel Guerreiro
Rodrigues, Ana Paula Drummond
Diniz, Cristovam Wanderley Picanço
Diniz, José Antonio Picanço
Maraba virus is a member of the genus Vesiculovirus of the Rhabdoviridae family that was isolated in 1983 from sandflies captured in the municipality of Maraba, state of Pará, Amazônia, Brazil. Despite 30 years having passed since its isolation, little is known about the neuropathology induced by the Maraba virus. Accordingly, in this study the histopathological features, inflammatory glial changes, cytokine concentrations, and nitric oxide activity in the encephalon of adult mice subjected to Maraba virus nostril infection were evaluated. The results showed that 6 days after intranasal inoculation, severe neuropathological-associated disease signs appeared, including edema, necrosis and pyknosis of neurons, generalized congestion of encephalic vessels, and intra- and perivascular meningeal lymphocytic infiltrates in several brain regions. Immunolabeling of viral antigens was observed in almost all central nervous system (CNS) areas and this was associated with intense microglial activation and astrogliosis. Compared to control animals, infected mice showed significant increases in interleukin (IL)-6, tumor necrosis factor (TNF)-a, interferon (INF)-g, MCP-1, nitric oxide, and encephalic cytokine levels. We suggest that an exacerbated inflammatory response in several regions of the CNS of adult BALB/c mice might be responsible for their deaths.
xmlui.dri2xhtml.METS-1.0.item-citationFARIAS, Alexandre Maia de et al. Early and late neuropathological features of meningoencephalitis associated with Maraba virus infection. Brazilian Journal of Medical and Biological Research, v. 53, n. 4, e8604, 2020.
xmlui.dri2xhtml.METS-1.0.item-decsPrimaryRhabdoviridae / patogenicidade
Meningoencefalite / virologia
Infecções por Rhabdoviridae / virologia
Sistema Nervoso Central / virologia