Format

Send to

Choose Destination
FEBS Lett. 2004 Apr 9;563(1-3):223-8.

Role of protein kinase R in double-stranded RNA-induced expression of nitric oxide synthase in human astroglia.

Author information

1
Department of Oral Biology, University of Nebraska Medical Center, Lincoln, NE 68583-0740, USA.

Abstract

Environmental factor(s), such as viral infection, has been implicated as one of the triggering events leading to neuroinflammation in multiple sclerosis. This study underlines the importance of double-stranded RNA (dsRNA), the active component of a viral infection, in inducing the expression of inducible nitric oxide synthase (iNOS) in human astroglia. DsRNA in the form of synthetic polyinosinic-polycytidylic acid (poly IC) induced expression of iNOS and iNOS promoter-driven luciferase activity through activation of nuclear factor (NF)-kappaB and CCAAT/enhancer-binding proteinbeta (C/EBPbeta). In addition, we show that inhibitors of protein kinase R attenuated iNOS by suppressing the activation of NF-kappaB but not C/EBPbeta. In contrast, knock down of p38 mitogen-activated protein kinase (MAPK) attenuated iNOS by suppressing the activation of C/EBPbeta but not NF-kappaB. This study delineates a novel role of dsRNA in inducing the expression of iNOS through dsRNA-activated protein kinase (PKR)-mediated activation of NF-kappaB and p38-mediated activation of C/EBPbeta in human astroglia that may participate in virus-induced neurological abnormalities.

PMID:
15063753
PMCID:
PMC1986658
DOI:
10.1016/S0014-5793(04)00302-3
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Wiley Icon for PubMed Central
Loading ...
Support Center