RSK1重新编程乌比奎途径以促进免疫抑制
Qiao Peng1, Yunfei Chen2, Junmiao Zhao1
1Tongji University Cancer Center, Shanghai Tenth People's Hospital, School of Medicine, Shanghai 200072, China.
Cell reports
|September 23, 2025
概括
研究人员发现RNF19A通过抑制I型干扰素释放来抑制免疫检查点阻塞 (ICB) 治疗. RSK1-化UBE2L6酶驱动这种抑制,为癌症治疗提供了新的治疗点.
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:
- 免疫检查点阻塞 (ICB) 在癌症治疗中表现有前途,但瘤的内在抵抗性限制了它对许多患者的有效性.
- 了解瘤内在免疫抑制的分子机制对于提高ICB疗效至关重要.
研究的目的:
- 确定影响ICB反应的瘤内在免疫抑制的新型调节剂.
- 阐明通过RNF19A抑制免疫反应的分子途径.
主要方法:
- 在体内基因查以识别免疫抑制剂.
- 生物化学测试以确定蛋白质相互作用和酶活性 (无化,酸化).
- 异种移植小鼠模型和患者瘤组织的分析.
主要成果:
- 确定RNF19A是一种新型免疫抑制剂,通过ubiquitinatingcGAS损害ICB的疗效,从而抑制I型干扰素的产生.
- 发现UBE2L6,一种ISG15结合酶,是RNF19A介导的cGAS无处不在的主要E2酶.
- RSK1酸化UBE2L6,将其功能从ISG15ylation切换到ubiquitination,从而促进免疫抑制.
- 在临床前模型中,抑制RSK1或UBE2L6酸化增强了抗瘤免疫反应.
- 患者组织中UBE2L6水平升高和酸化与免疫透不良以及对免疫疗法和放射治疗的反应降低相关.
结论:
- 通过RSK1介导的UBE2L6酸化将其转化为泛素E2酶,促进RNF19A驱动的cGAS泛素化,并导致瘤内在免疫抑制.
- 这一途径代表了对ICB耐药性的关键机制,并表明RSK1和UBE2L6是克服耐药性和改善癌症治疗结果的潜在治疗标.
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