具有微卫星不稳定的瘤可以调节TREX1以逃避抗瘤免疫
Yan Xu1, Zheqi Zhou1,2, Wenzheng Chen1
1State Key Laboratory of Molecular Oncology, Frontiers Science Center for Cancer Integrative Omics, Peking University Cancer Hospital and Institute, Peking University International Cancer Institute, Peking University Health Science Center , Beijing, China.
The Journal of experimental medicine
|October 7, 2025
概括
缺陷不匹配修复 (dMMR) 瘤积累DNA,激活cGAS-STING通路. 抑制TREX1,一种DNA消化酶,增强CD8+T细胞免疫力,阻断瘤生长并增强免疫疗法潜力.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- MSI-H/dMMR瘤表现出高突变率和免疫激活,但仍然逃避免疫监测.
- 这些瘤逃脱免疫消除的机制尚不清楚.
研究的目的:
- 阐明细胞质DNA传感和DNA修复途径在MSI-H/dMMR瘤免疫逃避中的作用.
- 调查针对这些途径进行癌症免疫治疗的治疗潜力.
主要方法:
- 利用了MSI-H/dMMR瘤的小鼠模型,这些瘤在DNA修复和免疫信号通路中存在遗传变化.
- 在基因或药理干预后评估瘤生长,免疫细胞透 (特别是CD8+T细胞) 和全身抗瘤免疫力.
- 研究了细胞质DNA,cGAS-STING通路和瘤细胞内的TREX1活性之间的相互作用.
主要成果:
- MSI-H/dMMR瘤积累细胞质双链DNA,激活cGAS-STING通路并上调TREX1.1.
- 在这些瘤中,TREX1的耗尽导致了在免疫能力强的环境中瘤排斥,这取决于CD8+ T细胞.
- 损失TREX1放大了cGAS-STING信号传递,增强了CD8+T细胞激活和全身抗瘤免疫力.
- 消灭cGAS-STING信号取消了TREX1删除的抗瘤作用.
- 在体内,TREX1的抑制减少了MSI-H/dMMR瘤的生长.
结论:
- cGAS-STING-TREX1轴在MSI-H/dMMR癌症中代表了一个关键的免疫逃生机制.
- 向TREX1可以通过促进cGAS-STING通路和促进CD8+ T细胞反应来增强抗瘤免疫力.
- 抑制TREX1具有显著的临床潜力,可以改善MSI-H/dMMR瘤患者的免疫治疗结果.
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