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Immunity

Immunity

IF: 26.3
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Manganese Increases the Sensitivity of the cGAS-STING Pathway for Double-Stranded DNA and Is Required for the Host Defense against DNA Viruses

Published:17 April 2018 DOI: 10.1016/j.immuni.2018.03.017 PMID: 29653696
Chenguang Wang, Yukun Guan, Mengze Lv, Rui Zhang, Zhaoying Guo, Xiaoming Wei, Xiaoxia Du, Jing Yang, Tong Li, Yi Wan, Xiaodong Su, Xiaojun Huang, Zhengfan Jiang

Abstract

Manganese (Mn) is essential for many physiological processes, but its functions in innate immunity remain undefined. Here, we found that Mn2+ was required for the host defense against DNA viruses by increasing the sensitivity of the DNA sensor cGAS and its downstream adaptor protein STING. Mn2+ was released from membrane-enclosed organelles upon viral infection and accumulated in the cytosol where it bound directly to cGAS. Mn2+ enhanced the sensitivity of cGAS to double-stranded DNA (dsDNA) and its enzymatic activity, enabling cGAS to produce secondary messenger cGAMP in?the presence of low concentrations of dsDNA that would otherwise be non-stimulatory. Mn2+ also?enhanced STING activity by augmenting cGAMP-STING binding affinity. Mn-deficient mice showed diminished cytokine production and were more vulnerable to DNA viruses, and Mn-deficient STING-deficient mice showed no increased susceptibility. These findings indicate that Mn is critically involved and required for the host defense against DNA viruses.

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