SPTAN1/NUMB轴感知细胞密度,通过Hippo信号传递抑制细胞生长和瘤发生
Dongxue Su1, Yuxi Li1, Weiji Zhang1
1State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University and.
The Journal of clinical investigation
|October 16, 2023
概括
高细胞密度通过SPTAN1和NUMB1/2激活Hippo信号,抑制YAP以维持接触抑制. 低密度可以逆转这种情况,激活YAP并促进细胞生长,这对于了解癌症发展至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- 失去接触抑制是癌症的一个标志.
- 河马-Yes相关蛋白 (Hippo/YAP) 途径调节细胞生长以应对细胞密度.
- 河马信号感知细胞密度的精确机制尚未完全理解.
研究的目的:
- 阐明河马信号通路感知细胞密度的机制.
- 为了确定参与调解细胞密度依赖的Hippo信号的关键蛋白质.
- 研究这种途径在细胞生长调节和瘤发生中的作用.
主要方法:
- 研究了光谱α链,非红细胞1 (SPTAN1) 酸化对细胞密度的反应中的作用.
- 研究了NUMB内细胞适配蛋白异型1和2 (NUMB1/2) 通过化SPTAN1.1.2的招募.
- 分析了NUMB1/2与微管类亲和调节激酶 (MARKs) 的相互作用及其随后对Hippo激酶MST1/2.2的影响.
- 研究了NUMB和WW45敲击肝脏对器官生长和瘤发生的影响.
- 评估了NUMB异型在肝癌中的表达及其与YAP激活的相关性.
主要成果:
- 高细胞密度诱导SPTAN1酸化,将NUMB1/2招募到等离子体膜中.
- NUMB1/2封存MARKs,防止MST1/2抑制并增强WW45相互作用,激活Hippo信号和抑制YAP.
- 细胞密度低导致SPTAN1脱,NUMB细胞质局部化,MST1/2抑制和YAP激活.
- 肝脏中NUMB和WW45的损失导致器官扩大和快速瘤发生.
- 无法与SPTAN1相互作用的NUMB异形3和4在肝癌中被上调,与YAP激活相关.
结论:
- 一个新的SPTAN1/NUMB1/2轴充当细胞密度传感器,将外部信号与细胞内Hippo信号连接起来.
- 这个轴抑制细胞生长,并通过激活高细胞密度的Hippo信号来阻止瘤发生.
- 这个轴的调节失调,特别是特定的NUMB异型的上调调节,有助于YAP激活和肝脏瘤发生.
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