来自瘤的RAC1A159V突变促进了一个免疫抑制的微环境,抑制对免疫检查点抑制剂的反应
Mingjun Cai1,2, Mike Adam2, Xin Duan2
1Graduate Program of Development, Stem Cells, and Regenerative Medicine, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA.
Science advances
|October 29, 2025
概括
通过激活mTOR信号传递,RAC1A159V突变驱动了更快的瘤生长和免疫逃避. 将mTOR抑制与抗PD1治疗结合起来,可以克服感冒瘤中的抗药性.
科学领域:
- 在瘤学瘤学.
- 癌症生物学 癌症生物学
- 免疫学 免疫学 免疫学
背景情况:
- RAC1A159V突变与癌症预后不佳有关.
- 了解RAC1A159V在瘤生长和免疫逃避中的作用至关重要.
研究的目的:
- 研究内源RAC1A159V突变的功能后果.
- 阐明RAC1驱动的免疫逃避背后的机制.
- 探索RAC1A159V相关癌症的治疗策略.
主要方法:
- 基因编辑在小鼠中产生RAC1A159V突变.
- 流细胞计和单细胞RNA测序 (scRNA-seq) 用于免疫分析.
- 评估瘤生长和对抗PD1治疗的反应.
- 药理上抑制mTORC1信号传递.
主要成果:
- RAC1A159V突变可以对RAC1和mTOR信号进行上调,从而促进瘤更快的生长.
- RAC1A159V瘤表现出一种免疫抑制的"冷"微环境,该微环境对抗PD1疗法具有抗性.
- 这种突变增加了葡萄糖脂生物合成,激活了mTORC1,增强了葡萄糖溶解,并减少了化学激素的产生和IFNGR1的表达.
- 拉巴胺素 (mTORC1抑制剂) 通过逆转这些效应,使瘤对抗PD1重新敏感.
结论:
- RAC1A159V通过mTORC1激活促进免疫逃避,导致冷瘤表型.
- 针对RAC1-mTOR信号与免疫检查点抑制剂相结合,为免疫冷瘤提供了潜在的治疗策略.
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