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

Cyclic GMP-AMP is an endogenous second messenger in innate immune signaling by cytosolic DNA.
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DOI:
10.1126/science.1229963
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发表时间:
2013-02-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Chen ZJ
Chen ZJ
中科院分区:
其他
文献类型:
--
作者:
Wu J;Sun L;Chen X;Du F;Shi H;Chen C;Chen ZJ

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胞质DNA诱导I型干扰素和其他细胞因子,它们对抗菌防御很重要,但也可导致自身免疫。这种DNA信号通路需要衔接蛋白STING和转录因子IRF 3,但DNA传感的机制尚不清楚。在这里,我们表明,哺乳动物胞质提取物合成环GMP-AMP(cGAMP)在体外从ATP和GTP在DNA的存在下,而不是RNA。哺乳动物细胞的DNA转染或DNA病毒感染也触发cGAMP产生。cGAMP与STING结合,导致IRF 3的活化和干扰素-β的诱导。因此,cGAMP代表后生动物中的第一个环状二核苷酸,并且其作为内源性第二信使起作用,其响应于胞质DNA而触发干扰素产生。
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. Here we showed that mammalian cytosolic extracts synthesized cyclic-GMP-AMP (cGAMP) in vitro from ATP and GTP 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 represents the first cyclic di-nucleotide in metazoa and it functions as an endogenous second messenger that triggers interferon production in response to cytosolic DNA.
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