Abstract
Liver damage upon exposure to ionizing radiation (IR), whether accidental or therapeutic, can contribute to liver dysfunction. Currently, radiotherapy (RT) is used for various cancers including hepatocellular carcinoma (HCC); however, the treatment dose is limited by radiation-induced liver disease (RILD) with a high mortality rate. Furthermore, the precise molecular mechanisms of RILD remain poorly understood. Here, we investigated RILD pathogenesis using various knockout mouse strains subjected to whole-liver irradiation. We found that hepatocytes released a large quantity of double-stranded DNA (dsDNA) after irradiation. The cGAS-STING pathway in non-parenchymal cells (NPCs) was promptly activated by this dsDNA, causing interferon (IFN)-I production and release and concomitant hepatocyte damage. Genetic and pharmacological ablation of the IFN-I signaling pathway protected against RILD. Moreover, clinically irradiated human peri-HCC liver tissues exhibited substantially higher STING and IFNβ expression than non-irradiated tissues. Increased serum IFNβ concentrations post-radiation were associated with RILD development in patients. These results delineate cGAS-STING induced type 1 interferon release in NPCs as a key mediator of IR-induced liver damage and described a mechanism of innate-immunity-driven pathology, linking cGAS-STING activation with amplification of initial radiation-induced liver injury.
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Acknowledgements
This work was supported by the National Nature Science Foundation of China (No. 81773220 and U1505229).
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Study concept and design: S.D. and Z.Z.; acquisition of data: G.C. and S.D.; analysis and interpretation of data: S.D. and G.C.; acquisition of patient specimens: P.Y., Y.C., Y.H. and S.D.; drafting of the manuscript: S.D. and Z.Z.; critical revision of the manuscript: J.Z., J.F. and Z.Z.; obtained funding: administrative, Z.Z.; technical or other material support: S.D. and G.C.; study supervision: Z.Z.
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Du, S., Chen, G., Yuan, B. et al. DNA sensing and associated type 1 interferon signaling contributes to progression of radiation-induced liver injury. Cell Mol Immunol 18, 1718–1728 (2021). https://doi.org/10.1038/s41423-020-0395-x
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DOI: https://doi.org/10.1038/s41423-020-0395-x
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