Muscle inactivation of mTOR causes metabolic and dystrophin defects leading to severe myopathy.

Muscle inactivation of mTOR causes metabolic and dystrophin defects leading to severe myopathy.
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DOI:
10.1083/jcb.200903131
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发表时间:
2009-12-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Gangloff YG
Gangloff YG
中科院分区:
其他
文献类型:
--
作者:
Risson V;Mazelin L;Roceri M;Sanchez H;Moncollin V;Corneloup C;Richard-Bulteau H;Vignaud A;Baas D;Defour A;Freyssenet D;Tanti JF;Le-Marchand-Brustel Y;Ferrier B;Conjard-Duplany A;Romanino K;Bauché S;Hantaï D;Mueller M;Kozma SC;Thomas G;Rüegg MA;Ferry A;Pende M;Bigard X;Koulmann N;Schaeffer L;Gangloff YG

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mTor主要通过mTORC1起作用,以一种与猛禽和载体无关的机制控制肌营养不良蛋白的转录。哺乳动物雷帕霉素靶蛋白(mTOR)是细胞生长的关键调控因子,分别与raptor和vector结合形成mTOR复合物1 (mTORC1)和mTORC2。迅猛龙是氧化肌肉完整性所必需的,而迅猛龙则是可有可无的。在这项研究中,我们发现肌肉特异性mTOR失活会导致严重的肌病,导致过早死亡。mtor缺失肌肉的代谢变化与raptor缺失肌肉相似,包括氧化代谢受损、线粒体调节改变以及与蛋白激酶B/Akt过度激活相关的糖原积累。此外,mtor缺乏的肌肉表现出增加的基础葡萄糖摄取,而全身葡萄糖稳态基本维持。重要的是,mTOR的缺失加剧了慢氧化和快速糖酵解肌肉的肌病特征。此外,mTOR而非raptor和rictor缺乏导致肌营养不良蛋白含量降低。我们提供的证据表明,mTOR以细胞自主、雷帕霉素耐药和激酶独立的方式控制肌营养不良蛋白的转录。总的来说,我们的研究结果表明mTOR主要通过mTORC1起作用,而对肌营养不良蛋白的调节是独立于猛禽和矢量的。
mTor, acting mainly via mTORC1, controls dystrophin transcription in a raptor- and rictor-independent mechanism. Mammalian target of rapamycin (mTOR) is a key regulator of cell growth that associates with raptor and rictor to form the mTOR complex 1 (mTORC1) and mTORC2, respectively. Raptor is required for oxidative muscle integrity, whereas rictor is dispensable. In this study, we show that muscle-specific inactivation of mTOR leads to severe myopathy, resulting in premature death. mTOR-deficient muscles display metabolic changes similar to those observed in muscles lacking raptor, including impaired oxidative metabolism, altered mitochondrial regulation, and glycogen accumulation associated with protein kinase B/Akt hyperactivation. In addition, mTOR-deficient muscles exhibit increased basal glucose uptake, whereas whole body glucose homeostasis is essentially maintained. Importantly, loss of mTOR exacerbates the myopathic features in both slow oxidative and fast glycolytic muscles. Moreover, mTOR but not raptor and rictor deficiency leads to reduced muscle dystrophin content. We provide evidence that mTOR controls dystrophin transcription in a cell-autonomous, rapamycin-resistant, and kinase-independent manner. Collectively, our results demonstrate that mTOR acts mainly via mTORC1, whereas regulation of dystrophin is raptor and rictor independent.
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