Scripps VIVO scripps research logo

  • Index
  • Log in
  • Home
  • People
  • Organizations
  • Research
  • Events
Search form

Mitofusins 1/2 and ERR alpha expression are increased in human skeletal muscle after physical exercise

Academic Article
uri icon
  • Overview
  • Identity
  • Additional Document Info
  • View All
scroll to property group menus

Overview

authors

  • Cartoni, R.
  • Leger, B.
  • Hock, M. B.
  • Praz, M.
  • Crettenand, A.
  • Pich, S.
  • Ziltener, J. L.
  • Luthi, F.
  • Deriaz, O.
  • Zorzano, A.
  • Gobelet, C.
  • Kralli, Anastasia
  • Russell, A. P.

publication date

  • August 2005

journal

  • Journal of Physiology-London  Journal

abstract

  • Mitochondrial impairment is hypothesized to contribute to the pathogenesis of insulin resistance. Mitofusin (Mfn) proteins regulate the biogenesis and maintenance of the mitochondrial network, and when inactivated, cause a failure in the mitochondrial architecture and decreases in oxidative capacity and glucose oxidation. Exercise increases muscle mitochondrial content, size, oxidative capacity and aerobic glucose oxidation. To address if Mfn proteins are implicated in these exercise-induced responses, we measured Mfn1 and Mfn2 mRNA levels, pre-, post-, 2 and 24 h post-exercise. Additionally, we measured the expression levels of transcriptional regulators that control mitochondrial biogenesis and functions, including PGC-1alpha, NRF-1, NRF-2 and the recently implicated ERRalpha. We show that Mfn1, Mfn2, NRF-2 and COX IV mRNA were increased 24 h post-exercise, while PGC-1alpha and ERRalpha mRNA increased 2 h post-exercise. Finally, using in vitro cellular assays, we demonstrate that Mfn2 gene expression is driven by a PGC-1alpha programme dependent on ERRalpha. The PGC-1alpha/ERRalpha-mediated induction of Mfn2 suggests a role of these two factors in mitochondrial fusion. Our results provide evidence that PGC-1alpha not only mediates the increased expression of oxidative phosphorylation genes but also mediates alterations in mitochondrial architecture in response to aerobic exercise in humans.

subject areas

  • Adult
  • Energy Metabolism
  • Estrogen Receptor alpha
  • Exercise
  • GTP Phosphohydrolases
  • Gene Expression
  • Humans
  • Male
  • Membrane Proteins
  • Membrane Transport Proteins
  • Mitochondria
  • Mitochondrial Membrane Transport Proteins
  • Mitochondrial Proteins
  • Muscle, Skeletal
  • Promoter Regions, Genetic
  • Signal Transduction
scroll to property group menus

Identity

PubMed Central ID

  • PMC1474174

International Standard Serial Number (ISSN)

  • 0022-3751

Digital Object Identifier (DOI)

  • 10.1113/jphysiol.2005.092031

PubMed ID

  • 15961417
scroll to property group menus

Additional Document Info

start page

  • 349

end page

  • 358

volume

  • 567

issue

  • 1

©2021 The Scripps Research Institute | Terms of Use | Powered by VIVO

  • About
  • Contact Us
  • Support