DDX6经历相位分离,以调节代谢可塑性和化学抗性
Hongjie Bi1,2,3, Wei Li1,2, Lili Ren1,2,3
1Department of Systems Biology, Beckman Research Institute of City of Hope, Monrovia, CA, USA.
Nature communications
|December 2, 2025
概括
死亡盒螺旋酶6 (DDX6) 是急性髓性白血病 (AML) 的一个关键漏洞. 它在压力颗粒和处理身体组合中的作用影响癌细胞代谢和化疗反应.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 细胞生物学 细胞生物学
背景情况:
- 压力颗粒 (SG) 和处理器官 (PB) 通过液态分离 (LLPS) 调节基因表达.
- SGs和PBs在瘤发生,特别是急性髓性白血病 (AML) 中的作用尚不清楚.
- RNA结合蛋白是SG和PB的关键组成部分.
研究的目的:
- 通过选涉及SG和PB的RNA结合蛋白来确定急性髓性白血病 (AML) 的脆弱性.
- 研究DEAD-box酶6 (DDX6) 在AML病变发生中的作用及其对LLPS的依赖.
- 阐明DDX6影响AML细胞代谢和药物敏感性的分子机制.
主要方法:
- 在体外和体内的CRISPR查使用一个针对RNA结合蛋白的图书馆.
- 在AML模型中对DDX6的淘汰赛 (KO) 研究.
- 分析PB组装,mRNA动态和细胞代谢.
- 对细胞氨基酸化疗的敏感性评估.
主要成果:
- 确定DDX6是AML的一个关键漏洞.
- DDX6淘汰赛 (KO) 显著延迟了白血病发生,对正常血液形成的影响很小.
- 在AML中DDX6的功能依赖于其诱导LLPS和PB组装的能力.
- DDX6 KO导致PB溶解,释放低GC含量的mRNA (例如BCAT1) 进行降解.
- 降低的BCAT1水平重新编程了氨基酸代谢,使AML细胞对cytarabine敏感.
结论:
- DDX6是AML进展的关键调节者,主要是通过其在PB形成和mRNA调节中的作用.
- 向DDX6会破坏mRNA稳态,改变细胞代谢,提高AML的化疗疗效率.
- DDX6代表了急性髓性白血病治疗的有前途的治疗脆弱性.
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