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Nat Immunol. 2006 Jan;7(1):40-8. Epub 2005 Nov 13.

A Toll-like receptor-independent antiviral response induced by double-stranded B-form DNA.

Author information

  • 1Exploratory Research for Advanced Technology, Japan Science and Technology Agency, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan.

Erratum in

  • Nat Immunol. 2006 Apr;7(4):427.

Abstract

The innate immune system recognizes nucleic acids during infection or tissue damage; however, the mechanisms of intracellular recognition of DNA have not been fully elucidated. Here we show that intracellular administration of double-stranded B-form DNA (B-DNA) triggered antiviral responses including production of type I interferons and chemokines independently of Toll-like receptors or the helicase RIG-I. B-DNA activated transcription factor IRF3 and the promoter of the gene encoding interferon-beta through a signaling pathway that required the kinases TBK1 and IKKi, whereas there was substantial activation of transcription factor NF-kappaB independent of both TBK and IKKi. IPS-1, an adaptor molecule linking RIG-I and TBK1, was involved in B-DNA-induced activation of interferon-beta and NF-kappaB. B-DNA signaling by this pathway conferred resistance to viral infection in a way dependent on both TBK1 and IKKi. These results suggest that both TBK1 and IKKi are required for innate immune activation by B-DNA, which might be important in antiviral innate immunity and other DNA-associated immune disorders.

PMID:
16286919
[PubMed - indexed for MEDLINE]
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