Human SLC46A2 Is the Dominant cGAMP Importer in Extracellular cGAMP-Sensing Macrophages and Monocytes.

Human SLC46A2 Is the Dominant cGAMP Importer in Extracellular cGAMP-Sensing Macrophages and Monocytes.
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人源SLC46A2是细胞外环二核苷酸单磷酸腺苷(cGAMP)感应型巨噬细胞和单核细胞中主要的cGAMP转运蛋白。

DOI:
10.1021/acscentsci.1c00440
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发表时间:
2021-06-23
影响因子:
18.2
通讯作者:
Li L
Li L
中科院分区:
化学1区
文献类型:
--
作者:
Cordova AF;Ritchie C;Böhnert V;Li L

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施用外源性CDN以激活cGAMP-STING途径是释放癌症免疫疗法的全部潜力的有前景的治疗策略。这种策略反映了内源性细胞外cGAMP的作用,cGAMP是一种免疫递质,从癌细胞转移到宿主中的cGAMP敏感细胞,促进免疫。然而,肿瘤内宿主细胞使用的CDN输入机制仍然未知。在这里,我们鉴定了蛋白SLC 46 A2作为原代人单核细胞中的主要cGAMP输入者。此外,我们发现单核细胞和M1极化的巨噬细胞直接感知小鼠肿瘤中肿瘤来源的细胞外cGAMP。最后,我们证明了SLC 46 A2是单核细胞衍生的巨噬细胞中占主导地位的cGAMP输入者。总之,我们提供了cGAMP作为免疫递质的第一个细胞和分子机制,为有效的STING途径治疗铺平了道路。肿瘤来源的细胞外cGAMP激活免疫。在这里,我们表明,巨噬细胞和单核细胞直接感知cGAMP,SLC 46 A2是人单核细胞谱系细胞中占主导地位的cGAMP输入者。
Administration of exogenous CDNs to activate the cGAMP-STING pathway is a promising therapeutic strategy to unleash the full potential of cancer immunotherapy. This strategy mirrors the role of endogenous extracellular cGAMP, an immunotransmitter that is transferred from cancer cells to cGAMP-sensing cells in the host, promoting immunity. However, the CDN import mechanisms used by host cells within tumors remain unknown. Here we identified the protein SLC46A2 as the dominant cGAMP importer in primary human monocytes. Furthermore, we discovered that monocytes and M1-polarized macrophages directly sense tumor-derived extracellular cGAMP in murine tumors. Finally, we demonstrated that SLC46A2 is the dominant cGAMP importer in monocyte-derived macrophages. Together, we provide the first cellular and molecular mechanisms of cGAMP as an immunotransmitter, paving the way for effective STING pathway therapeutics. Tumor-derived extracellular cGAMP activates immunity. Here, we show that macrophages and monocytes directly sense cGAMP and that SLC46A2 is the dominant cGAMP importer in human monocyte lineage cells.
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