Abstract
Reoviruses infect a variety of mammalian hosts and serve as an important experimental system for studying the mechanisms of virus-induced injury. Reovirus infection induces apoptosis in cultured cells in vitro and in target tissues in vivo, including the heart and central nervous system (CNS). In epithelial cells, reovirus-induced apoptosis involves the release of tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) from infected cells and the activation of TRAIL-associated death receptors (DRs) DR4 and DR5. DR activation is followed by activation of caspase 8, cleavage of Bid, and the subsequent release of pro-apoptotic mitochondrial factors. By contrast, in neurons, reovirus-induced apoptosis involves a wider array of DRs, including TNFR and Fas, and the mitochondria appear to play a less critical role. These results show that reoviruses induce apoptotic pathways in a cell and tissue specific manner. In vivo there is an excellent correlation between the location of viral infection, the presence of tissue injury and apoptosis, indicating that apoptosis is a critical mechanism by which disease is triggered in the host. These studies suggest that inhibition of apoptosis may provide a novel strategy for limiting virus-induced tissue damage following infection.
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Clarke, P., Tyler, K.L. Reovirus-induced apoptosis: A minireview. Apoptosis 8, 141–150 (2003). https://doi.org/10.1023/A:1022966508671
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DOI: https://doi.org/10.1023/A:1022966508671