Peroxisome proliferator-activated receptor-γ co-activator 1α-mediated metabolic remodeling of skeletal myocytes mimics exercise training and reverses lipid-induced mitochondrial inefficiency

Timothy R. Koves, Ping Li, Jie An, Takayuki Akimoto, Dorothy Slentz, Olga Ilkayeva, G. Lynis Dohm, Zhen Yan, Christopher B. Newgard, Deborah M. Muoio*

*この研究の対応する著者

研究成果: Article査読

361 被引用数 (Scopus)

抄録

Peroxisome proliferator-activated receptor-γ co-activator 1α (PGC1α) is a promiscuous co-activator that plays a key role in regulating mitochondrial biogenesis and fuel homeostasis. Emergent evidence links decreased skeletal muscle PGC1α activity and coincident impairments in mitochondrial performance to the development of insulin resistance in humans. Here we used rodent models to demonstrate that muscle mitochondrial efficiency is compromised by diet-induced obesity and is subsequently rescued by exercise training. Chronic high fat feeding caused accelerated rates of incomplete fatty acid oxidation and accumulation of β-oxidative intermediates. The capacity of muscle mitochondria to fully oxidize a heavy influx of fatty acid depended on factors such as fiber type and exercise training and was positively correlated with expression levels of PGC1α. Likewise, an efficient lipid-induced substrate switch in cultured myocytes depended on adenovirus-mediated increases in PGC1α expression. Our results supported a novel paradigm in which a high lipid supply, occurring under conditions of low PGC1α, provokes a disconnect between mitochondrial β-oxidation and tricarboxylic acid cycle activity. Conversely, the metabolic remodeling that occurred in response to PGC1α overexpression favored a shift from incomplete to complete β-oxidation. We proposed that PGC1α enables muscle mitochondria to better cope with a high lipid load, possibly reflecting a fundamental metabolic benefit of exercise training.

本文言語English
ページ(範囲)33588-33598
ページ数11
ジャーナルJournal of Biological Chemistry
280
39
DOI
出版ステータスPublished - 2005 9 30
外部発表はい

ASJC Scopus subject areas

  • 生化学
  • 分子生物学
  • 細胞生物学

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