六价通过SUV39H1增强翻译促进恶性转变
Yiwei Gu1, Yanan Cao2, Qing Ye2
1Markey Cancer Center, University of Kentucky College of Medicine, Lexington, KY, 40506, USA; Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY, 40506, USA; Guangdong Provincial Key Laboratory of Gastroenterology, Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, 510515, China.
暴露于六价[Cr(VI]会通过mTORC1/4E-BP1信号激活上依赖翻译,从而促进癌症. 抑制这种途径通过减少SUV39H1转化来抑制Cr(VI) 诱导的细胞转化和DNA损伤.
科学领域:
- 环境健康 环境健康
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- 六价[Cr(VI) 是一种与肺癌相关的环境致癌物.
- 已知Cr(VI) 致癌的遗传和表观遗传机制,但转化控制尚未探索.
研究的目的:
- 调查转化控制在CrVI诱导的致癌过程中的作用.
- 确定将Cr (VI) 暴露与癌症发展联系起来的分子途径.
主要方法:
- 在BEAS-2BR人类支气管上皮细胞中,慢性低剂量Cr (VI) 暴露.
- 研究了mTORC1/4E-BP1信号通路及其对翻译的影响.
- 利用药理抑制,猛禽击退和突变4E-BP1表达.
- 评估了细胞转化,癌症干细胞 (CSC) 样性质和DNA损伤.
- 检查了基因组甲基转移酶SUV39H1.1. 的作用.
主要成果:
- 通过mTORC1-介导的4E-BP1失活,CrVI暴露激活了eIF4E驱动的翻译.
- 这种途径的抑制抑制了Cr(VI) 诱导的细胞转化,CSC特性和DNA损伤.
- SUV39H1被Cr(VI) 翻译上调,并导致恶性表型.
- mTORC1/4E-BP1通路的抑制减少了SUV39H1的翻译,而SUV39H1的过度表达恢复了恶性表型.
结论:
- 通过mTORC1/4E-BP1调节SUV39H1的翻译上调是Cr (VI) 致癌的一个关键机制.
- 这种途径将翻译控制与表观遗传重编程相结合,以应对环境致癌物.
- 针对mTORC1/4E-BP1通路提供了一种潜在的治疗策略,可以对抗CrVI诱导的癌症.
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