Journal Article
Research Support, Non-U.S. Gov't
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Apoptotic cell death is an important cause of neuronal injury in experimental Venezuelan equine encephalitis virus infection of mice.

Mice develop a fatal encephalomyelitis after infection with the Trinidad donkey strain of Venezuelan equine encephalitis (VEE) virus. Adult mice were inoculated intraperitoneally with VEE virus and the brains were examined at different time points. Morphological changes were assessed by histological staining. VEE virus antigen was detected with immunoperoxidase staining, and DNA fragmentation was evaluated in situ using the terminal deoxynucleotidyl transferase-mediated dUTP-digoxigenin nick end labeling (TUNEL) method. VEE antigen was found in many areas of the brain and it was prominent in neurons. There were mild associated inflammatory changes. DNA fragmentation was demonstrated in many of these areas using TUNEL. In areas with TUNEL staining, morphological neuronal changes ranged from nuclear chromatin condensations to nuclear and cellular fragmentation, which are characteristic of apoptosis. There is strong morphological and biochemical evidence of apoptotic cell death in this experimental model of VEE virus infection.

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