Replication-incompetent virions of Japanese encephalitis virus triggr neuronal cell death by oxidative stress in a culture system Free

Abstract

It has been shown that replication of the Japanese encephalitis virus (JEV) can trigger infected cells to undergo apoptosis. In the present study, it is further demonstrated that replication-incompetent virions of JEV, obtained by short-wavelength ultraviolet (UV) irradiation, could also induce host-cell death. It was found that UV-inactivated JEV (UV-JEV) caused cell death in neuronal cells such as mouse neuroblastoma N18 and human neuronal NT-2 cells, but not in non-neuronal baby hamster kidney BHK-21 fibroblast or human cervical HeLa cells. Only actively growing, but not growth-arrested, cells were susceptible to the cytotoxic effects of UV-JEV. Killing of UV-JEV-infected N18 cells could be antagonized by co-infection with live, infectious JEV, suggesting that virions of UV-JEV might engage an as-yet-unidentified receptor-mediated death-signalling pathway. Characteristically, mitochondrial alterations were evident in UV-JEV-infected N18 cells, as revealed by electron microscopy and a loss of membrane potential. N18 cells infected by UV-JEV induced generation of reactive oxygen species (ROS) as well as the activation of nuclear factor kappa B (NF-B), and the addition of anti-oxidants or specific NF-B inhibitors to the media greatly reduced the cytotoxicity of UV-JEV. Together, the results presented here suggest that replication-incompetent UV-JEV damages actively growing neuronal cells through a ROS-mediated pathway.

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2004-02-01
2024-03-29
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