失去VHL可以通过促进I型干扰素反应来实现免疫检查点阻塞疗法
bioRxiv : the preprint server for biology
|December 11, 2023
概括
在清细胞细胞癌 (ccRCC) 中失去希佩尔-林道 (VHL) 基因可以提高抗PD-1疗法的有效性. VHL基因损失通过释放线粒体DNA触发免疫反应,增强免疫治疗结果.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
背景情况:
- 清细胞细胞癌 (ccRCC) 显示出对免疫检查点阻塞 (ICB) 疗法的显著反应,尽管基因突变负担中等.
- 希佩尔-林道 (VHL) 基因的功能丧失突变是ccRCC中最常见的遗传变异.
研究的目的:
- 研究VHL基因突变与ICB治疗在ccRCC中的疗效之间的机制联系.
- 阐明VHL损失如何影响瘤微环境和免疫反应.
主要方法:
- 利用了带有VHL基因遗传淘汰的小鼠瘤模型.
- 进行抗PD-1疗法以评估治疗疗效.
- 分析了分子机制,包括HIF1α/HIF2α上调,线粒体功能和cGAS-STING通路激活.
主要成果:
- 基因淘汰VHL基因显著提高了抗PD-1疗法的疗效,以T细胞依赖的方式.
- VHL损失导致HIF1α和HIF2α上调,线粒体外膜潜能降低,以及线粒体DNA (mtDNA) 的细胞质泄漏.
- 释放的mtDNA激活了cGAS-STING通路,诱导I型干扰素并促进抗瘤免疫力.
结论:
- 在VHL基因中的功能丧失突变是ccRCC对ICB治疗反应的关键决定因素.
- 通过线粒体功能障碍和DNA释放,VHL损失通过触发内在免疫信号级联来增强ccRCC免疫疗法.
- 这些发现为VHL在ccRCC病原和免疫治疗反应中的作用提供了新的见解.
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