细胞循环调节的Akt酶的激活,通过其基终端的酸化
Pengda Liu1, Michael Begley2, Wojciech Michowski3
1Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.
Nature
|March 28, 2014
概括
Akt (蛋白激酶B) 激活进一步通过细胞循环依赖的酸化在S477/T479.9进行调节. 这一发现将细胞周期进展与癌症中的Akt过活化联系在一起,影响细胞增殖和存活.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 癌症研究 癌症研究
背景情况:
- Akt (蛋白激酶B) 对于细胞增殖,生存和新陈代谢至关重要.
- 阿克特的过度活化与癌症的发展,预后不佳和对治疗的抗性有关.
- 已知的Akt激活部位是S473和T308,但完全的激活机制和与细胞循环失调的联系仍然不清楚.
研究的目的:
- 为了研究超出S473和T308.8的Akt激活的新机制.
- 探索Akt过活化与癌症细胞循环进展之间的关系.
主要方法:
- 分析细胞循环中的Akt活动波动.
- 调查环林依赖激酶2 (Cdk2) /环林A和mTORC2在S477和T479.的Akt酸化中的作用.
- 使用缺乏环素A2的小鼠和小鼠胚胎干细胞来评估S477/T479酸化的生理影响.
主要成果:
- 发现Akt活性随细胞周期而波动,反映了循环蛋白A的表达.
- 通过Cdk2/cyclin A或mTORC2在S477和T479的Akt酸化促进了Akt的激活,可能通过促进或补偿S473酸化.
- 在小鼠中删除环林A2导致S477/T479酸化减少和细胞亡增加,该细胞亡部分由修饰的Akt1挽救,证实了环林A2的生理作用.
结论:
- Akt S477/T479酸化代表了Akt激活和生理功能的关键调节层.
- 这项研究确定了异常细胞循环进展和癌症中的Akt过活化之间的机制联系.
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