Journal of General Virology, Vol 80, 51-56, Copyright © 1999 by Society for General Microbiology

ARTICLES

US3 protein kinase of herpes simplex virus type 2 plays a role in protecting corneal epithelial cells from apoptosis in infected mice

S Asano, T Honda, F Goshima, D Watanabe, Y Miyake, Y Sugiura and Y Nishiyama
Research Institute for Disease Mechanism and Control, Department of Ophthalmology, Nagoya University School of Medicine, Japan.

To clarify the biological role of US3 protein kinase of herpes simplex virus type 2 (HSV-2) in vivo, the expression of the viral antigen, the appearance of apoptotic bodies and DNA fragmentation were examined immunohistologically after corneal infection of mice with three different kinds of HSV-2 strain 186: the wild-type virus, a US3- deficient mutant (L1BR1) and its revertant (L1B-11). In both wild-type 186- and L1B-11-infected mice, viral antigen was diffusely found in the corneal epithelium; no apoptotic changes were detected in the epithelial cells. Whereas, in L1BR1-infected mice, HSV-immunoreactivity was localized around the virus-inoculated sites, and a large number of apoptotic bodies were observed in the corneal epithelium with dual- positive reactions for both HSV-immunostaining and TUNEL staining. These results suggest that the US3 protein kinase plays an important role in protecting HSV-2-infected cells from apoptotic death in vivo.

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