确定一个瘤抑制网络,对抗核 Akt 功能
Lloyd C Trotman1, Andrea Alimonti, Pier Paolo Scaglioni
1Cancer Biology and Genetics Program, Memorial Sloan-Kettering Cancer Center, Sloan-Kettering Institute, 1275 York Avenue, New York, New York 10021, USA.
这种PML瘤抑制剂通过使核AKT无活化来预防癌症. 损失PML加速癌症和损害FOXO转录因子,突出显示了癌症中的AKT细分.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 原型瘤基因AKT在许多人类癌症中被激活,通常是由于PTEN损失.
- 在细胞膜上激活的AKT酸化了像FOXO转录因子这样的核标,但其在瘤发生中的核作用尚不清楚.
研究的目的:
- 研究PML瘤抑制剂在调节核AKT活动中的作用及其对瘤发生的影响.
主要方法:
- 利用具有Pten-异合突变的小鼠模型研究PML损失的影响.
- 研究了PML核体中AKT和PP2a的定位和活性.
- 评估了PML缺乏对FOXO转录因子活性和下游目标的影响.
主要成果:
- 在Pten异合性小鼠中,PML损失加速了瘤的发病,发病率和进展.
- 普米尔缺乏导致前列腺瘤发生和女性不育,模仿Foxo3a淘汰赛表型.
- Pml将AKT酸酶PP2a和pAKT招募到核体中,而Pml-null细胞显示PP2a活动受损,导致核pAKT积累.
- 降低的PML水平导致Foxo3a介导的Bim和p27的转录失活.
结论:
- 通过非激活核AKT,PML作为核瘤抑制剂.
- PML策划了一个核网络来控制核AKT,强调了AKT在癌症中的细分的重要性.
- PML的功能突出了针对癌症治疗中的AKT局部化的潜在治疗策略.
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