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J. Virol., Jan 1997, 398-404, Vol 71, No. 1
JT Bruder and I Kovesdi
Previous studies have shown that airway administration of adenovirus or
adenovirus vectors results in a dose-dependent inflammatory response which
limits the duration of transgene expression. We explored the possibility
that adenovirus infection triggers signal transduction pathways that induce
the synthesis of cytokines and thus contribute to the early inflammatory
response. Since stimulation of the Raf/mitogen- activated protein kinase
(MAPK) pathway activates transcription factors that control the expression
of inflammatory cytokines, we examined the activation of this pathway
following adenovirus infection. Adenovirus infection induced the rapid
activation of Raf-1 and a transient increase in the tyrosine
phosphorylation and activation of p42mapk at early times postinfection.
Activation of the Raf/MAPK pathway by adenovirus is likely triggered by the
infection process, since it occurred rapidly and with various mutant
adenoviruses and adenovirus vectors. Moreover, interleukin-8 (IL-8) mRNA
accumulation was evident at 20 min postinfection and was induced even in
the presence of cycloheximide. Both MAPK activation and IL-8 production
were inhibited by forskolin, a potent inhibitor of Raf-1. These results
suggest that adenovirus-induced Raf/MAPK activation contributes to IL-8
production. Adenovirus-induced activation of the Raf/MAPK signaling pathway
and IL- 8 production may play critical roles in the inflammation observed
following in vivo administration of adenovirus vectors for gene therapy.
Copyright © 1997, American Society for Microbiology
Adenovirus infection stimulates the Raf/MAPK signaling pathway and induces interleukin-8 expression
GenVec, Inc., Rockville, Maryland 20852, USA.
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