MYC与新生RNA结合抑制R-循环衍生的RNA-DNA混合体的先天免疫信号
Leonie Uhl1, Amel Aziba1, Sinah Löbbert2
1Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany.
Cell
|January 23, 2026
概括
在细胞应激过程中,MYC基蛋白经历相变,转移到RNA. 这种由RNA驱动的反应抑制了免疫性RNA-DNA混合体,这对瘤生长至关重要.
科学领域:
- 分子生物学
- 癌症学
- 免疫学
背景情况:
- 这种MYC瘤蛋白在细胞增殖中起着至关重要的作用,在癌症中经常出现失调.
- MYC的功能与转录有关,但其在压力下的动态行为尚未完全理解.
- 内部RNA的积累可以触发涉及MYC的细胞反应.
研究的目的:
- 研究MYC蛋白对乱的转录延长和RNA积累的反应.
- 阐明MYC经历阶段过渡的机制及其功能后果.
- 确定MYC的RNA结合区域在应激反应和瘤生长中的作用.
主要方法:
- 针对内基RNA积累的MYC的全球转移研究.
- 分析MYC多重化及其与RNA,核外体和双链RNA/R循环的相互作用.
- 在细胞测定和体内瘤模型中对MYC的RNA结合区域 (RBRI-IV),特别是RBRIII的功能性表征.
- 评估MYC在抑制RNA-DNA杂交和通过TBK1/TLR3途径预防先天性免疫激活中的作用.
主要成果:
- 在内基RNA积累后,MYC从DNA转移到新生RNA,形成RNA驱动的相位过渡.
- 由RBRIII介导的MYC多重化将核外体复合物集中在双链RNA和R环周围.
- 在抑制RNA-DNA杂交和防止TLR3激活TBK1方面,RBRIII对于MYC的作用至关重要,但对于基底增殖来说不可用.
- 在体内维持瘤生长中,RBRIII是不可或缺的,这凸显了它在MYC驱动的瘤发生过程中的关键作用.
结论:
- MYC的相位转换是RNA驱动的应激反应,对于防止免疫性RNA-DNA混合物的积累至关重要.
- MYC的RBRIII域是这种应激反应的关键媒介,抑制R循环和先天免疫激活.
- 针对MYC的RNA结合能力,特别是RBRIII,可能为MYC驱动的癌症提供新的治疗策略.
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