在体外TGFβ1依赖的三维 (3D) 肌结构中,mTORC1和STAT3信号是不可或缺的
Bon-Hyeock Koo, Aiden Smith, Kyu Sang Joeng1
1McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6081, USA.
BMB reports
|June 11, 2025
概括
转化生长因子-β1 (TGFβ1) 通过mTORC1-STAT3信号驱动3D肌的形成. 抑制这种途径会损害肌的加厚和原蛋白的产生,这对肌成熟至关重要.
科学领域:
- 生物医学工程 生物医学工程
- 细胞生物学 细胞生物学
- 组织工程是组织工程.
背景情况:
- 转化生长因子-β1 (TGFβ1) 对细胞功能和细胞外基质生产至关重要.
- 以前的研究证实了TGFβ1在体外3D肌结构形成中的作用,但下游的途径尚不清楚.
研究的目的:
- 为了研究猛胺素复合物1 (mTORC1) 和信号转换器和转录激活器3 (STAT3) 的哺乳动物目标在TGFβ1诱导的3D肌形成中的作用.
- 阐明TGFβ1对细胞行为和细胞外矩阵发育的影响中介的信号机制.
主要方法:
- 使用拉巴胺素 (mTORC1抑制剂) 和静态 (STAT3抑制剂) 来阻止3D肌结构中的特定信号通路.
- 评估了TGFβ1诱导的肌结构形态,细胞增殖和原纤维生成的变化.
- 进行分子分析以检查信号通路激活和基因表达 (例如,Scx).
主要成果:
- 抑制mTORC1或STAT3显著损害TGFβ1诱导的肌结构加厚,细胞增殖和原蛋白生产.
- 发现mTORC1-STAT3信号通路部分调解TGFβ1对Scx表达和外围细胞延长的影响.
- TGFβ1治疗增加了mTOR和STAT3酸化;mTORC1抑制降低了TGFβ1诱导的STAT3酸化,表明路径交叉.
结论:
- TGFβ1-mTORC1-STAT3信号通路是体外3D肌结构的形成和成熟的组成部分.
- mTORC1-STAT3轴是TGFβ1对肌发育,细胞分化和细胞外矩阵组织的影响的关键调解者.
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