Reduced AMPK-ACC and mTOR signaling in muscle from older men, and effect of resistance exercise

Mengyao Li, Lex B. Verdijk, Kei Sakamoto, Brian Ely, Luc J.C. van Loon, Nicolas Musi

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

AMP-activated protein kinase (AMPK) is a key energy-sensitive enzyme that controls numerous metabolic and cellular processes. Mammalian target of rapamycin (mTOR) is another energy/nutrient-sensitive kinase that controls protein synthesis and cell growth. In this study we determined whether older versus younger men have alterations in the AMPK and mTOR pathways in skeletal muscle, and examined the effect of a long term resistance type exercise training program on these signaling intermediaries. Older men had decreased AMPKα2 activity and lower phosphorylation of AMPK and its downstream signaling substrate acetyl-CoA carboxylase (ACC). mTOR phosphylation also was reduced in muscle from older men. Exercise training increased AMPKα1 activity in older men, however, AMPKα2 activity, and the phosphorylation of AMPK, ACC and mTOR, were not affected. In conclusion, older men have alterations in the AMPK-ACC and mTOR pathways in muscle. In addition, prolonged resistance type exercise training induces an isoform-selective up regulation of AMPK activity.

Original languageEnglish (US)
Pages (from-to)655-664
Number of pages10
JournalMechanisms of Ageing and Development
Volume133
Issue number11-12
DOIs
StatePublished - Nov 2012

Keywords

  • AMPK
  • Aging
  • MTOR
  • Resistance exercise
  • Skeletal muscle

ASJC Scopus subject areas

  • Aging
  • Developmental Biology

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