Central role of double-stranded RNA-activated protein kinase in microbial induction of nitric oxide synthase

Kohsaku Uetani, Sandy D. Der, Maryam Zamanian-Daryoush, Carol De La Motte, Belinda Y. Lieberman, Bryan R.G. Williams, Serpil C. Erzurum

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Abstract

NO synthase 2 (NOS2) is induced in airway epithelium by influenza virus infection. NOS2 induction late in the course of viral infection may occur in response to IFN-γ, but early in infection gene expression may be induced by the viral replicative intermediate dsRNA through the dsRNA-activated protein kinase (PKR). Since PKR activates signaling pathways important in NOS2 gene induction, we determined whether PKR is a component in the signal transduction pathway leading to NOS2 gene expression after viral infection of airway epithelium. We show that NOS2 gene expression in human airway epithelial cells occurs in response to influenza A virus or synthetic dsRNA. Furthermore, dsRNA leads to rapid activation of PKR, followed by activation of signaling components including NF-κB and IFN regulatory factor 1. NOS2 expression is markedly diminished and IFN regulatory factor 1 and NF-κB activation are substantially impaired in PKR null cells. Strikingly, NOS2 induction in response to LPS is abolished in PKR null cells, confirming a central role for PKR in the general signaling pathway to NOS2.

Original languageEnglish
Pages (from-to)988-996
Number of pages9
JournalJournal of Immunology
Volume165
Issue number2
DOIs
Publication statusPublished - 15 Jul 2000
Externally publishedYes

Cite this

Uetani, K., Der, S. D., Zamanian-Daryoush, M., De La Motte, C., Lieberman, B. Y., Williams, B. R. G., & Erzurum, S. C. (2000). Central role of double-stranded RNA-activated protein kinase in microbial induction of nitric oxide synthase. Journal of Immunology, 165(2), 988-996. https://doi.org/10.4049/jimmunol.165.2.988