期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 282, 期 50, 页码 36642-36651出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M707006200
关键词
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资金
- NHLBI NIH HHS [T32 HL007275] Funding Source: Medline
- NIA NIH HHS [R01 AG000425] Funding Source: Medline
- NIDDK NIH HHS [P30 DK052574, P30 DK056341-06, P30 DK056341-07, P30 DK056341, R01 DK074700, P60 DK020579, R01 DK045416] Funding Source: Medline
The transcriptional coactivator peroxisome proliferator-activated receptor gamma coactivator-1 alpha(PGC-1 alpha) has been identified as an inducible regulator of mitochondrial function. Skeletal muscle PGC-1 alpha expression is induced post-exercise. Therefore, we sought to determine its role in the regulation of muscle fuel metabolism. Studies were performed using conditional, muscle-specific, PGC-1 alpha gain-of-function and constitutive, generalized, loss-of-function mice. Forced expression of PGC-1 alpha increased muscle glucose uptake concomitant with augmentation of glycogen stores, a metabolic response similar to post-exercise recovery. Induction of muscle PGC-1 alpha expression prevented muscle glycogen depletion during exercise. Conversely, PGC-1 alpha-deficient animals exhibited reduced rates of muscle glycogen repletion post-exercise. PGC-1 alpha was shown to increase muscle glycogen stores via several mechanisms including stimulation of glucose import, suppression of glycolytic flux, and by down-regulation of the expression of glycogen phosphorylase and its activating kinase, phosphorylase kinase alpha. These findings identify PGC-1 alpha as a critical regulator of skeletal muscle fuel stores.
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