TBC1D1的功能是作为卫星细胞的负调节器,用于肌肉再生
Xinyu Yang1,2, Ye Cao1,2, Yinqiu Mu1,2
1State Key Laboratory of Pharmaceutical Biotechnology, Department of Endocrinology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center, Nanjing University, Nanjing, China.
Nature communications
|November 18, 2025
概括
在细胞质中,TBC1D1保留AS160-STAT3复合体,抑制肌肉卫星细胞 (MuSC) 的增殖. 酸化释放了这个复合体,促进了肌肉再生,这表明TBC1D1是治疗点.
科学领域:
- 肌肉干细胞生物学 肌肉干细胞生物学
- 细胞信号传递途径 细胞信号传递途径
- 蛋白质与蛋白质之间的相互作用
背景情况:
- AS160是一种Rab GTPase激活蛋白 (RabGAP),作为STAT3的转录协激活剂,调节肌肉卫星细胞 (MuSC) 增殖.
- 对于AS160-STAT3复合体的精确调节,人们的理解仍然很差.
研究的目的:
- 阐明 MuSC 中 AS160-STAT3 复合物的调控机制.
- 研究TBC1D1在控制AS160-STAT3复合物局部化和MuSC功能中的作用.
主要方法:
- 同免疫沉测试检测蛋白质复合体的形成.
- 在体外激酶试验测试以评估TBC1D1酸化.
- 在TBC1D1淘汰赛和突变模型中分析MuSC增殖和肌肉再生.
主要成果:
- TBC1D1与AS160和STAT3形成一个超级复合体,在细胞质中隔离AS160-STAT3复合体.
- 通过蛋白激酶B在Thr596的TBC1D1的酸化破坏了TBC1D1-AS160的相互作用,释放了AS160-STAT3复合体.
- 一种非酸化的TBC1D1突变会损害MuSC的增殖和肌肉修复,而TBC1D1缺乏会增强MuSC的增殖和再生.
结论:
- TBC1D1通过在细胞质中维持AS160-STAT3复合体,作为MuSC增殖的负调节剂.
- 通过TBC1D1调节AS160-STAT3局部化对于肌肉再生至关重要.
- TBC1D1代表了增强肌肉修复和再生的潜在治疗标.
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