与癌症相关的PTEN突变体以主导负态的方式抑制PTEN蛋白功能
Antonella Papa1, Lixin Wan2, Massimo Bonora3
1Cancer Research Institute, Beth Israel Deaconess Cancer Center, Department of Medicine and Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
Cell
|April 29, 2014
概括
PTEN蛋白形成二元来调节其活性. 与癌症相关的PTEN突变可能会损害这种功能,导致瘤易感性增加和类似于完全失去PTEN的效果.
科学领域:
- 分子生物学分子生物学
- 在瘤学瘤学.
- 生物化学 生物化学
背景情况:
- PTEN (酸酶和张素同源) 是一种关键的瘤抑制剂.
- PTEN功能障碍与各种癌症有关.
- 了解PTEN调节对于癌症治疗至关重要.
研究的目的:
- 调查PTEN同质化和异质化与突变形式在调节PTEN活性中的作用.
- 为了阐明与癌症相关的PTEN突变的体内后果.
- 为了区分PTEN损失与PTEN突变在癌症发病过程中的影响.
主要方法:
- 生物化学试验用于研究PTEN同位体化和脂质酸酶活性.
- 产生和分析具有特定癌症相关突变 (PtenC124S,PtenG129E) 的Pten knockin小鼠模型.
- 评估PI3-K/Akt途径在Pten knockin小鼠的细胞和组织中的激活.
主要成果:
- 在一个活性构造中,PTEN同质化,去酸化酸氨基 (3,4,5) - 三酸盐 (PtdIns(3,4,5) P3).
- 催化不活的PTEN突变体与野生型PTEN异构,以主导-负的方式抑制其活性.
- 具有异合突变的Pten knockin小鼠显示PI3-K/Akt激活灵敏度增加和瘤倾向性增加,模仿完全的Pten损失.
结论:
- PTEN突变和完全的PTEN丧失是癌症发展的不同机制.
- PTEN二元化是其瘤抑制功能的关键调节机制.
- 与癌症相关的PTEN突变可以发挥主导作用,影响野生型PTEN活动并促进瘤发生.
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