A PGC-1α isoform induced by resistance training regulates skeletal muscle hypertrophy.

A PGC-1α isoform induced by resistance training regulates skeletal muscle hypertrophy.
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DOI:
10.1016/j.cell.2012.10.050
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发表时间:
2012-12-07
期刊:
影响因子:
64.5
通讯作者:
Spiegelman BM
Spiegelman BM
中科院分区:
生物学1区
文献类型:
--
作者:
Ruas JL;White JP;Rao RR;Kleiner S;Brannan KT;Harrison BC;Greene NP;Wu J;Estall JL;Irving BA;Lanza IR;Rasbach KA;Okutsu M;Nair KS;Yan Z;Leinwand LA;Spiegelman BM

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PGC-1α 是一种由运动诱导的转录共激活因子,它使肌肉对耐力型运动产生许多众所周知的适应,但对肌肉力量或肥大没有影响。我们已经鉴定出一种新形式的 PGC-1α (PGC-1α4),它是由替代启动子使用和初级转录物剪接产生的。 PGC-1α4 在运动肌肉中高表达,但不调节大多数已知的 PGC-1α 靶标,例如线粒体 OXPHOS 基因。相反,它特异性诱导 IGF1 并抑制肌肉生长抑制素,并且 PGC-1α4 在体外和体内的表达可诱导强健的骨骼肌肥大。重要的是,骨骼肌特异性转基因表达 PGC-1α4 的小鼠表现出肌肉质量和力量增加,并且对癌症恶病质引起的肌肉消耗有显着的抵抗力。在抗阻运动期间,小鼠和人类肌肉中优先诱导 PGC-1α4 的表达。这些研究发现了一种新型 PGC-1α 蛋白,它可以调节和协调与骨骼肌肥大相关的因素。
PGC-1α is a transcriptional coactivator induced by exercise that gives muscle many of the best known adaptations to endurance-type exercise, but has no effects on muscle strength or hypertrophy. We have identified a novel form of PGC-1α (PGC-1α4) that results from alternative promoter usage and splicing of the primary transcript. PGC-1α4 is highly expressed in exercised muscle but does not regulate most known PGC-1α targets such as the mitochondrial OXPHOS genes. Rather, it specifically induces IGF1 and represses myostatin, and expression of PGC-1α4 in vitro and in vivo induces robust skeletal muscle hypertrophy. Importantly, mice with skeletal muscle-specific transgenic expression of PGC-1α4 show increased muscle mass and strength, and dramatic resistance to the muscle wasting of cancer cachexia. Expression of PGC-1α4 is preferentially induced in mouse and human muscle during resistance exercise. These studies identify a novel PGC-1α protein that regulates and coordinates factors involved in skeletal muscle hypertrophy.
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