这种mTOR路径控制了BRAF在T401的酸化
Daniel Christen1,2,3, Manuel Lauinger1,2, Melanie Brunner4
1Institute of Molecular Medicine, University of Freiburg, Stefan-Meier-Str. 17, 79104, Freiburg, Germany.
Cell communication and signaling : CCS
|September 2, 2024
概括
猛素 (mTOR) 信号传递的哺乳动物标,而不是ERK,在T401驱动BRAF酸化. 像torin1和dactolisib这样的mTOR抑制剂抑制了这种酸化,揭示了癌症中BRAF信号的新调节轴.
科学领域:
- 细胞信号通道是细胞信号通道.
- 癌症生物学 癌症生物学
- 疾病的分子机制.
背景情况:
- RAS/RAF/MEK/ERK通路对于细胞平衡至关重要,其失调有助于癌症.
- BRAF是该途径的关键调节者,T401的酸化传统上归因于ERK信号传递.
- 了解BRAF监管对于开发向癌症疗法至关重要.
研究的目的:
- 调查BRAF酸化在T401.1上的上游调节器.
- 为了确定ERK或其他信号通路是否调解T401酸化.
- 探索针对已识别的调节途径的治疗潜力.
主要方法:
- 在各种细胞系中对内源BRAF T401酸化 (pT401) 的分析.
- 用BRAF/RAF1,MEK,ERK,mTOR和PI3K/mTOR通路的特定抑制剂进行治疗.
- 对mTOR通路组件 (RHEB,mTOR,Raptor,Rictor) 的基因操纵和pT401水平的评估.
- 质谱测量用于识别BRAF上的受影响酸化部位.
主要成果:
- 在未受刺激的细胞中观察到基底pT401水平,独立于急性生长因子刺激.
- ERK,MEK和BRAF/RAF1抑制剂没有降低pT401水平,这表明ERK独立的机制.
- mTOR抑制剂 (torin1,dactolisib) 显著抑制了pT401,时间和剂量取决于这种方式.
- mTOR路径的遗传激活增加了pT401,mTOR抑制剂可以逆转这种情况.
- mTORC1复合体 (猛龙) 的耗尽增强了torin1对pT401的抑制,而mTORC2 (鱼) 的效果较小.
- 托林1在T401,S405和S409特别抑制了酸化,但其他调节部位没有.
结论:
- 猛素 (mTOR) 轴的哺乳动物点,而不是ERK,是T401的BRAF酸化的主要驱动因素.
- mTOR抑制剂代表了调节BRAF信号的新疗法策略.
- 这些发现揭示了mTOR和BRAF通道之间以前未知的交叉通话.
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