通过抵抗训练诱导的PGC-1α异型调节了骨肌肉缩
Jorge L Ruas1, James P White, Rajesh R Rao
1Department of Cell Biology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA. jorge.ruas@ki.se
Cell
|December 11, 2012
概括
一种新发现的PGC-1α4蛋白质,由抵抗运动诱导,通过增强IGF1和减少肌激素,促进骨肌肉缩. 这一发现提供了关于肌肉生长和对抗肌肉衰竭的见解.
科学领域:
- 分子生物学分子生物学
- 运动生理学 运动生理学
- 肌肉生物学 肌肉生物学
背景情况:
- 过氧体增殖器激活受体马协活性剂1-α (PGC-1α) 是肌中运动诱导的适应的关键调节者,主要影响耐力.
- 标准PGC-1α主要影响线粒体生物发生和氧化代谢,对肌肉强度或缩没有显著影响.
研究的目的:
- 识别和描述参与骨肌肉适应的PGC-1α的新型异型.
- 研究一种特定的PGC-1α异型 (PGC-1α4) 在调节肌肉质量,强度和抵抗肌肉衰竭方面的作用.
主要方法:
- 通过使用替代促进剂和拼接分析识别PGC-1α4.
- 在体外和体内研究,以评估PGC-1α4表达对肌肉细胞和动物模型的影响.
- 分析PGC-1α4对关键肌肉调节因子,如IGF1和肌素的影响.
- 使用了具有骨肌特异性PGC-1α4表达的转基因小鼠模型.
主要成果:
- PGC-1α4在炼肌肉中表达很高,并特别诱导类似胰岛素的生长因子1 (IGF1),同时抑制肌静素.
- 在体外和体内PGC-1α4的表达导致显著的骨肌肉缩.
- 过度表达PGC-1α4的转基因小鼠表现出增加的肌肉质量,强度和抵抗癌症缓解症的抵抗力.
- 在小鼠和人类骨肌中,PGC-1α4的表达主要是由抵抗运动诱导的.
结论:
- PGC-1α4代表了一种独特的PGC-1α异型,专门驱动骨肌肉缩.
- 这种异构体协调调节肌肉生长和质量的关键因素.
- PGC-1α4具有作为治疗肌肉损耗条件和增强肌肉性能的治疗点的潜力.
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