激活的Cdc42封存c-Cbl,并防止EGF受体降解降解
Wen Jin Wu1, Shine Tu, Richard A Cerione
1Department of Molecular Medicine, Veterinary Medical Center, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA.
Cell
|September 25, 2003
概括
Cdc42的激活阻止了EGF受体通过c-Cbl的泛化,这是细胞生长调节的一个关键步骤. 失调导致持续的信号传输和细胞转化.
科学领域:
- 细胞生物学 细胞生物学
- 分子信号传递是分子信号传递.
- 癌症研究 癌症研究
背景情况:
- 一种与Ras相关的蛋白质Cdc42调节细胞生长,并参与细胞转化.
- 皮表皮生长因子 (EGF) 信号传递涉及EGF受体和c-Cbl泛基因酶.
- 这些通路的异常调节会导致细胞的不控制增殖.
研究的目的:
- 研究Cdc42在调节EGF受体活性中的作用.
- 阐明Cdc42影响EGF受体泛化的分子机制.
- 了解Cdc42失调如何促进细胞转化.
主要方法:
- 研究了激活Cdc42和p85Cool-1/beta-Pix之间的相互作用.
- 评估了Cdc42对c-Cbl与EGF受体的结合的影响.
- 利用构成性活性Cdc42 (Cdc42(F28L)) 来研究持续信号效应.
主要成果:
- 激活的Cdc42与p85Cool-1/beta-Pix结合,抑制EGF受体通过c-Cbl.
- 这种抑制阻止了EGF受体的负调节.
- 构成性活性Cdc42导致EGF受体持续信号和ERK激活,促进细胞转化.
结论:
- Cdc42在定时EGF受体-c-Cbl相互作用方面发挥着至关重要的作用.
- Cdc42作为EGF受体的保护因子,防止c-Cbl介导的降解.
- 通过Cdc42破坏这个调节轴,有助于瘤发生.
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