Interdependence of AMPK and SIRT1 for metabolic adaptation to fasting and exercise in skeletal muscle.

Interdependence of AMPK and SIRT1 for metabolic adaptation to fasting and exercise in skeletal muscle.
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DOI:
10.1016/j.cmet.2010.02.006
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发表时间:
2010-03-03
期刊:
影响因子:
29
通讯作者:
Auwerx J
Auwerx J
中科院分区:
生物学1区
文献类型:
--
作者:
Cantó C;Jiang LQ;Deshmukh AS;Mataki C;Coste A;Lagouge M;Zierath JR;Auwerx J

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在禁食期间和运动后,骨骼肌有效地从碳水化合物转换为脂质作为主要能量来源,以保持葡萄糖依赖性组织的糖原储存和血糖水平。骨骼肌细胞感觉到葡萄糖可用性的这种限制,并将此信息转化为转录和代谢适应。在这里,我们证明了AMPK作为主要的初始传感器,将此信息转化为转录调节因子PGC-1α和FOXO 1的SIRT 1依赖性脱乙酰化,最终导致线粒体和脂质利用基因的转录调节。AMPK活性不足会损害SIRT 1依赖性对运动和禁食的反应,导致PGC-1α脱乙酰化受损和线粒体基因表达的诱导减弱。因此,我们得出结论,AMPK作为禁食和运动诱导的骨骼肌适应的原始触发器,并且在AMPK缺乏状态下,SIRT 1及其下游信号通路的激活被不适当地触发。
During fasting and after exercise, skeletal muscle efficiently switches from carbohydrate to lipid as the main energy source to preserve glycogen stores and blood glucose levels for glucose-dependent tissues. Skeletal muscle cells sense this limitation in glucose availability and transform this information into transcriptional and metabolic adaptations. Here we demonstrate that AMPK acts as the prime initial sensor that translates this information into SIRT1-dependent deacetylation of the transcriptional regulators PGC-1α and FOXO1, culminating in the transcriptional modulation of mitochondrial and lipid utilization genes. Deficient AMPK activity compromises SIRT1-dependent responses to exercise and fasting, resulting in impaired PGC-1α deacetylation and blunted induction of mitochondrial gene expression. Thus, we conclude that AMPK acts as the primordial trigger for fasting- and exercise-induced adaptations in skeletal muscle and that activation of SIRT1 and its downstream signalling pathways are improperly triggered in AMPK deficient states.
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