Exercise and PGC-1 alpha-Independent Synchronization of Type I Muscle Metabolism and Vasculature by ERR gamma

Vihang A. Narkar, Weiwei Fan, Michael Downes, Ruth T. Yu, Johan W. Jonker, William A. Alaynick, Ester Banayo, Malith S. Karunasiri, Sabina Lorca, Ronald M. Evans*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

103 Citations (Scopus)

Abstract

How type I skeletal muscle inherently maintains high oxidative and vascular capacity in the absence of exercise is unclear. We show that nuclear receptor ERR gamma is highly expressed in type I muscle and, when transgenically expressed in anaerobic type II muscles (ERRGO mice), dually induces metabolic and vascular transformation in the absence of exercise. ERRGO mice show increased expression of genes promoting fat metabolism, mitochondrial respiration, and type I fiber specification. Muscles in ERRGO mice also display an activated angiogenic program marked by myofibrillar induction and secretion of proangiogenic factors, neovascularization, and a 100% increase in running endurance. Surprisingly, the induction of type I muscle properties by ERR gamma does not involve PGC-1 alpha. Instead, ERR gamma genetically activates the energy sensor AMPK in mediating the metabovascular changes in ERRGO mice. Therefore, ERR gamma represents a previously unrecognized determinant that specifies intrinsic vascular and oxidative metabolic features that distinguish type I from type II muscle.

Original languageEnglish
Pages (from-to)283-293
Number of pages11
JournalCell metabolism
Volume13
Issue number3
DOIs
Publication statusPublished - 2-Mar-2011

Keywords

  • ACTIVATED PROTEIN-KINASE
  • HUMAN SKELETAL-MUSCLE
  • ESTROGEN-RELATED RECEPTORS
  • TRANSCRIPTIONAL COACTIVATOR PGC-1-ALPHA
  • ORPHAN NUCLEAR RECEPTORS
  • FATTY-ACID OXIDATION
  • MITOCHONDRIAL-FUNCTION
  • INDUCED ANGIOGENESIS
  • ENERGY-METABOLISM
  • GENE-EXPRESSION

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