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J. Virol., Oct 1995, 6466-6472, Vol 69, No. 10
Z Bi, M Barna, T Komatsu and CS Reiss
Vesicular stomatitis virus (VSV) causes acute infection of the central
nervous system (CNS) when intranasally applied. We have examined cellular
inflammatory changes in the CNS following VSV infection. As early as 1 day
postinfection (p.i.), astrocytes were activated in the olfactory bulb (OB).
This was followed by activation of microglia, first observed in the OB at
day 3 p.i. Expression of inducible nitric oxide synthase was observed in
activated microglia in the OB at day 3 p.i., and increased inducible nitric
oxide synthase expression coincided with decreased virus titers in tissue
homogenates. Expression of major histocompatibility complex (MHC) class I
molecules on astrocytes and microglial, endothelial, and ependymal cells
was also rapidly induced and followed by induced expression of MHC class II
molecules on astrocytes and microglial and endothelial cells. Consistent
with the pattern of viral dissemination, MHC molecules were expressed
temporally from the rostral-to-caudal direction. Infiltration of CD8+ cells
was observed as early as 1 day p.i. in the OB. CD4+ cells were detected in
the OB at day 4 p.i. Increasing T-cell infiltration coincided with
decreased virus titers. In contrast, B-cell infiltration of the CNS was not
detected until day 14 p.i., after the virus was cleared and mice were
showing behavioral signs of recovery. Breakdown of the blood-brain barrier
was detected beginning at day 6 p.i., was most severe at day 8 p.i., and
was followed by full recovery. Collectively, these data show that both
innate immunity (production of nitric oxide) and acquired immunity
(expression of MHC molecules and T- cell infiltration) are activated
following VSV infection in the CNS.
Copyright © 1995, American Society for Microbiology
Vesicular stomatitis virus infection of the central nervous system activates both innate and acquired immunity
Department of Biology, New York University, New York 10003-6688, USA.
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