Thbs1以TGFβ-Smad2/3-ATF4依赖的方式调节骨肌肉质量
Davy Vanhoutte1, Tobias G Schips1, Rachel A Minerath1
1Department of Pediatrics, University of Cincinnati, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
血栓蛋白-1 (Thbs1) 激活TGFβ-Smad3-ATF4信号传递,导致肌肉缩. 抑制这种途径部分恢复肌肉质量,这表明肌肉消耗疾病和与衰老相关的肉症的治疗标.
科学领域:
- 肌肉生理学和分子生物学
- 衰老的研究研究.
- 细胞信号通道是细胞信号通道.
背景情况:
- 肌肉质量损失在慢性疾病和衰老中很常见.
- 骨肌缩影响运动能力和生存.
- 确定肌肉缩的分子驱动因素至关重要.
研究的目的:
- 为了研究血栓松丁-1 (Thbs1) 在骨肌肉缩中的作用.
- 阐明将Thbs1与肌肉衰竭联系起来的分子机制.
- 探索Thbs1介导信号作为肌肉缩的治疗点.
主要方法:
- 使用了骨肌特异的Thbs1转基因 (Thbs1 Tg) 和淘汰 (Thbs1-/-) 鼠标模型.
- 研究了转化生长因子β (TGFβ) -Smad2/3信号和激活转录因子4 (ATF4) 的参与.
- 评估了自-溶酶体通路 (ALP) 和全素-蛋白酶体系统 (UPS) 的调节.
主要成果:
- Thbs1 Tg小鼠表现出显著的肌肉缩,运动能力降低和过早死亡.
- Thbs1激活了TGFβ-Smad2/3信号,导致ATF4诱导,从而调节ALP和UPS,导致缩.
- 抑制TGFβ受体信号传递或删除Smad2/3或Atf4在Thbs1Tg小鼠中部分挽救的肌肉质量.
- Thbs1-/-小鼠在消化和热量限制模型中显示了减少的缩,TGFβ-Smad3-ATF4信号减弱.
结论:
- Thbs1介导的TGFβ-Smad3-ATF4信号在骨肌肉中驱动组织稀疏和缩.
- 这一途径是维持肌肉质量的关键调节者.
- 针对Thbs1介导的信号提供了一个潜在的治疗策略,用于肌肉缩相关的疾病和肉症.
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