Cyclic GMP-AMP is an endogenous second messenger in innate immune signaling by cytosolic DNA

Jiaxi Wu, Lijun Sun, Xiang Chen, Fenghe Du, Heping Shi, Chuo Chen, Zhijian J. Chen

Research output: Contribution to journalArticle

780 Scopus citations

Abstract

Cytosolic DNA induces type I interferons and other cytokines that are important for antimicrobial defense but can also result in autoimmunity. This DNA signaling pathway requires the adaptor protein STING and the transcription factor IRF3, but the mechanism of DNA sensing is unclear. We found that mammalian cytosolic extracts synthesized cyclic guanosine monophosphate- adenosine monophosphate (cyclic GMP-AMP, or cGAMP) in vitro from adenosine triphosphate and guanosine triphosphate in the presence of DNA but not RNA. DNA transfection or DNA virus infection of mammalian cells also triggered cGAMP production. cGAMP bound to STING, leading to the activation of IRF3 and induction of interferon-β. Thus, cGAMP in metazoans and functions as an endogenous second messenger that triggers interferon production in response to cytosolic DNA.

Original languageEnglish (US)
Pages (from-to)826-830
Number of pages5
JournalScience
Volume339
Issue number6121
DOIs
StatePublished - Feb 15 2013

ASJC Scopus subject areas

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