通过调节TFAM介导的线粒细胞衰变和铁稳定,POLR1A抑制铁
Tuo Zhang1, Yanyun Gao2, Marcell Harhai3
1Department of General Thoracic Surgery, Bern University Hospital, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.
Redox biology
|July 16, 2025
概括
癌细胞通过涉及RNA聚合酶I (POLR1A) 和TFAM的新型核-线粒体途径逃避编程细胞死亡 (PCD),抑制铁亡. 抑制这个轴使癌症对铁灭诱导物的敏感.
科学领域:
- 细胞生物学 细胞生物学
- 癌症生物学 癌症生物学
- 生物化学 生物化学
背景情况:
- 规避编程细胞死亡 (PCD) 是癌症的一个关键标志.
- 耐铁,一种依赖于铁的PCD的耐药性机制尚未完全理解.
- 脂质过氧化和铁代谢是铁亡的关键调节者.
研究的目的:
- 确定癌症中耐铁灭的新型机制.
- 阐明核细胞-线粒体信号轴在铁亡逃避中的作用.
- 探索治疗策略,以铁灭症抵抗为目标.
主要方法:
- 研究了RNA聚合酶I (POLR1A) 和线粒体转录因子A (TFAM) 在铁亡中的作用.
- 使用RNA干扰和药物抑制剂来破坏POLR1A-ATF4-TFAM轴.
- 评估了体外和体内癌症模型中的铁亡诱导和细胞死亡.
- 研究了RNA PolI抑制和GPX4阻断的协同效应.
主要成果:
- 鉴定了一种POLR1A-ATF4-TFAM信号轴,通过抑制甲基和限制可变铁 (Fe2+) 释放来抑制铁.
- 这种途径的破坏导致Fe2+的积累,并增加对ferroptosis诱导物的敏感性.
- 一种RNA PolI抑制剂CX-5461与GPX4阻断协同作用,诱导铁细胞死亡.
- 这种途径在多间皮质瘤和潜在的其他耐铁灭的癌症中是相关的.
结论:
- 一个涉及POLR1A和TFAM的新型核-线粒体通路赋予了对铁亡的抵抗力.
- 针对这种途径提供了一种有希望的策略,以克服癌症治疗阻力.
- 使用RNA PolI抑制剂和铁灭诱导剂的组合疗法显示出治疗潜力.
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