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2007-01-05

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/176890

Exercise-induced mitochondrial biogenesis begins before the increase in muscle PGC-1alpha expression

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Recurs relacionat

https://doi.org/10.1074/jbc.M606116200

Resum

Exercise results in rapid increases in expression of the transcription coactivator peroxisome proliferator-activated receptor gamma coactivator-1alpha (PGC-1alpha) and in mitochondrial biogenesis in skeletal muscle. PGC-1alpha regulates and coordinates mitochondrial biogenesis, and overexpression of PGC-1alpha in muscle cells results in increases in mitochondrial content. In this context, it has been proposed that the increase in PGC-1alpha protein expression mediates the exercise-induced increase in mitochondrial biogenesis. However, we found that mitochondrial proteins with a short half-life increase as rapidly as, or more rapidly than, PGC-1alpha protein. This finding led us to hypothesize that activation, rather than increased expression, of PGC-1alpha mediates the initial phase of the exercise-induced increase in mitochondria. In this study, we found that most of the PGC-1alpha in resting skeletal muscle is in the cytosol. Exercise resulted in activation of p38 MAPK and movement of PGC-1alpha into the nucleus. In support of our hypothesis, binding of the transcription factor nuclear respiratory factor 1 (NRF-1) to the cytochrome c promoter and NRF-2 to the cytochrome oxidase subunit 4 promoter increased in response to exercise prior to an increase in PGC-1alpha protein. Furthermore, exercise-induced increases in the mRNAs of cytochrome c, delta-aminolevulinate synthase, and citrate synthase also occurred before an increase in PGC-1 protein. Thus, it appears that activation of PGC-1alpha may mediate the initial phase of the exercise-induced adaptive increase in muscle mitochondria, whereas the subsequent increase in PGC-1alpha protein sustains and enhances the increase in mitochondrial biogenesis.

Matèries

Músculs, Metabolisme, RNA, Factors de transcripció, Proteïnes

Matèries (anglès)

Muscles, Metabolism, RNA, Transcription factors, Proteins

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Articles publicats en revistes (Ciències Fisiològiques)

Citació

WRIGHT, David C., et al. Exercise-induced mitochondrial biogenesis begins before the increase in muscle PGC-1alpha expression. Journal of Biological Chemistry. 2007. Vol. 282, num. 1, pags. 194-199. ISSN 0021-9258. [consulted: 11 of August of 2026]. Available at: https://hdl.handle.net/2445/176890

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