核PKM2在折叠的G-四重复中结合了前mRNA,并揭示了它们的基因调节作用
Dimitrios G Anastasakis1, Maria Apostolidi2, Khalid A Garman3
1RNA Molecular Biology Laboratory, NIAMS/NIH, Bethesda, MD, USA.
Molecular cell
|August 17, 2024
概括
核PKM2结合RNA G-四重复,促进癌症基因表达. 抑制PKM2减少了癌细胞的入侵,这表明癌症进展的治疗点.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 在RNA生物学,RNA生物学.
背景情况:
- 核酸酶M2 (PKM2) 的核定位在癌症中很常见.
- 越来越多的人认识到PKM2在新陈代谢之外的作用.
研究的目的:
- 调查核PKM2.2的非正规功能.
- 确定PKM2与RNA结构的相互作用及其在基因表达中的作用.
主要方法:
- 将PKM2确定为一种RNA结合蛋白 (RBP).
- 分析PKM2与前mRNA中的RNA G-四重复 (rG4) 结构的相互作用.
- 评估PKM2对rG4含有前mRNA的表达 ("rG4ome") 的影响.
- 评估PKM2和rG4ome在癌症进展中的作用,包括上皮细胞转换为介质细胞转换 (EMT) 和患者存活率.
- 研究在三阴性乳腺癌 (TNBC) 模型中抑制核PKM2积累的治疗潜力.
主要成果:
- 核PKM2作为一个RBP功能,专门结合于前mRNAs中的折叠RNA G-四重复 (rG4) 结构.
- 结合rG4s的PKM2会取代抑制的RBP (例如,HNRNPF),从而促进rG4含有的前mRNAs ("rG4ome") 的表达.
- 在EMT期间,rG4ome被上调,较高的rG4丰度与各种癌症类型的患者存活率较差有关.
- 抑制核PKM2积累抑制了TNBC细胞中的rG4ome,减少了癌细胞的迁移和in vitro和in vivo的入侵.
结论:
- 核PKM2是rG4ome的关键调节者,在瘤进展过程中影响基因表达.
- 折叠和展开的rG4结构之间的平衡,由像PKM2这样的RBPs调节,对于癌症的发展至关重要.
- 针对核PKM2提供了一种潜在的治疗策略,通过抑制rG4ome和抑制癌细胞入侵来对抗癌症.
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