通过AMPK和GSK3的协调酸化,TSC2整合了Wnt和能量信号,以调节细胞生长
Ken Inoki1, Hongjiao Ouyang, Tianqing Zhu
1Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA.
Cell
|September 9, 2006
概括
通过抑制GSK3,Wnt信号激活mTOR通路,促进细胞生长和瘤发育. 拉帕米辛可以阻止这种Wnt诱导的生长,提供潜在的癌症治疗.
科学领域:
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
- 在瘤学瘤学.
背景情况:
- 结核性硬化综合体是由TSC2瘤抑制器突变引起的,影响细胞生长调节.
- 通常情况下,TSC2通过激活Rheb GTPase来抑制细胞生长,抑制mTOR信号传递.
- mTOR (拉巴胺的机械性标) 是细胞生长和增殖的关键调节剂.
研究的目的:
- 为了阐明Wnt信号激活mTOR的机制.
- 研究GSK3和AMPK在Wnt介导的mTOR激活中的作用.
- 评估mTOR抑制在Wnt驱动癌症中的治疗潜力.
主要方法:
- 在TSC2-Rheb-mTOR通路上研究了Wnt信号效应.
- 利用酸化位点分析来了解GSK3和AMPK的作用.
- 在临床前模型中测试了Rapamycin在阻断Wnt诱导的细胞生长和瘤形成方面的有效性.
主要成果:
- 通过抑制GSK3,Wnt通过独立于β-catenin转录来激活mTOR.
- GSK3酸化TSC2,这是AMPK开源的过程,从而抑制mTOR.
- 拉帕米辛治疗有效地阻断了Wnt诱导的细胞增殖和瘤生长.
结论:
- 在转录效应之外,Wnt信号通过TSC-mTOR通路刺激细胞生长和翻译.
- 通过AMPK和GSK3对TSC2的顺序酸化整合了控制细胞生长的信号.
- 针对mTOR与拉巴胺呈现了一个可行的治疗策略,用于癌症与活跃的Wnt信号传递.
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