mTOR抑制通过调节eIF3D介导的选择性mRNA翻译来重新编程细胞蛋白质稳定,并促进细胞表型切换
Sejeong Shin1, Min-Joon Han2, Mark P Jedrychowski3
1Department of Physiology and Biophysics, University of Illinois College of Medicine at Chicago, Chicago, IL 60612, USA.
Cell reports
|July 26, 2023
概括
拉巴胺素 (mTOR) 抑制的机械标激活翻译因子eIF3D,促进细胞表型切换. 这突显了细胞如何动态地改变蛋白质稳定和细胞命运.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 拉巴胺素的机械标 (mTOR) 对于蛋白质静止和恒常状态至关重要.
- 调节不当的mTOR信号传递有助于癌症等疾病.
- 了解mTOR在蛋白质稳定和细胞命运中的作用具有临床意义.
研究的目的:
- 研究mTOR反信号,蛋白质稳定和细胞命运.
- 阐明真核转化启动因子3D (eIF3D) 在对mTOR抑制的反应中的作用.
- 确定eIF3D如何影响细胞表型切换.
主要方法:
- 研究了mTOR信号通路及其对翻译的影响.
- 分析了eIF3D在蛋白质合成和细胞行为中的功能.
- 研究了eIF3D与mRNA结合蛋白 (hnRNPF, hnRNPK, SSB) 的相互作用.
主要成果:
- mTOR准抑制了eIF4E介导的上限依赖翻译.
- 反信号激活了eIF3D,维持了替代的翻译机制.
- eIF3D介导的蛋白质合成驱动细胞表型从增殖转移到迁移.
- eIF3D与hnRNPF,hnRNPK和SSB合作,以支持选择性mRNA翻译后mTOR抑制.
- 观察到INSR/IGF1R/IRS和IL-6ST/JAK/STAT信号通路的升级和激活.
结论:
- 细胞通过反信号动态改变蛋白质稳定和细胞命运.
- eIF3D在 mTOR 抑制后调解细胞表型切换方面发挥着关键作用.
- 这些发现揭示了新的机制,控制蛋白质稳定和细胞行为,以响应信号干扰.
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