失去VHL可以通过激活抗病毒DNA传感途径来增强抗瘤免疫力
Meng Jiao1, Mengjie Hu1, Dong Pan1
1Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA.
iScience
|July 25, 2024
概括
希佩尔-林道 (VHL) 基因的损失可以增强抗瘤免疫力,并增强抗编程死亡1 (PD1) 疗法的疗效. 这通过VHL损失诱导的细胞应激发生,激活cGAS-STING通路和I型干扰子.
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:
- ·希佩尔-林道 (VHL) 基因是一种瘤抑制剂,常常在清细胞细胞癌 (ccRCC) 中发生突变.
- 由于稳定缺氧诱导因子 (HIF),VHL损失通常会导致细胞应激和代谢变化,但其在免疫反应中的作用尚不清楚.
- 通过VHL变化影响抗瘤免疫力的确切机制尚未完全阐明.
研究的目的:
- 调查VHL损失对抗编程死亡1 (PD1) 免疫疗法的疗效的影响.
- 阐明VHL缺陷调节抗瘤免疫反应的潜在分子机制.
主要方法:
- 利用了多个与VHL损失的小鼠瘤模型.
- 分析了T细胞依赖的免疫反应.
- 研究的缺氧诱导因子 (HIF) 水平,线粒体功能和DNA泄漏.
- 评估的循环GMP-AMP合成酶刺激干扰素基因 (cGAS-STING) 路径激活和I型干扰素诱导.
主要成果:
- 在T细胞依赖的方式上,VHL损失显著提高了抗PD1治疗的疗效.
- VHL损失导致HIF1α/2α上调,线粒体外膜潜能降低,线粒体DNA的细胞质释放.
- 这种线粒体损伤触发了cGAS-STING通路的激活,导致I型干扰素的产生增加.
结论:
- 失去VHL基因增强了抗瘤免疫力,并改善了抗PD1治疗结果.
- 这项研究揭示了一种新的机制,即VHL损失引起的细胞压力激活了cGAS-STING通路,促进了干扰素的产生并增强了抗瘤免疫监测.
- 这些发现提供了对VHL在调节瘤微环境中的作用的机制性见解,并建议针对VHL缺乏瘤的潜在治疗策略.
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