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Cell Metab. 2010 Dec 1;12(6):633-42. doi: 10.1016/j.cmet.2010.11.008.

Total skeletal muscle PGC-1 deficiency uncouples mitochondrial derangements from fiber type determination and insulin sensitivity.

Author information

1
Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA.

Erratum in

  • Cell Metab. 2011 Jan 5;13(1):114.

Abstract

Evidence is emerging that the PGC-1 coactivators serve a critical role in skeletal muscle metabolism, function, and disease. Mice with total PGC-1 deficiency in skeletal muscle (PGC-1α(-/-)β(f/f/MLC-Cre) mice) were generated and characterized. PGC-1α(-/-)β(f/f/MLC-Cre) mice exhibit a dramatic reduction in exercise performance compared to single PGC-1α- or PGC-1β-deficient mice and wild-type controls. The exercise phenotype of the PGC-1α(-/-)β(f/f/MLC-Cre) mice was associated with a marked diminution in muscle oxidative capacity, together with rapid depletion of muscle glycogen stores. In addition, the PGC-1α/β-deficient muscle exhibited mitochondrial structural derangements consistent with fusion/fission and biogenic defects. Surprisingly, the proportion of oxidative muscle fiber types (I, IIa) was not reduced in the PGC-1α(-/-)β(f/f/MLC-Cre) mice. Moreover, insulin sensitivity and glucose tolerance were not altered in the PGC-1α(-/-)β(f/f/MLC-Cre) mice. Taken together, we conclude that PGC-1 coactivators are necessary for the oxidative and mitochondrial programs of skeletal muscle but are dispensable for fundamental fiber type determination and insulin sensitivity.

PMID:
21109195
PMCID:
PMC2999961
DOI:
10.1016/j.cmet.2010.11.008
[Indexed for MEDLINE]
Free PMC Article

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