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FASEB J. 2015 Apr;29(4):1314-28. doi: 10.1096/fj.14-261503. Epub 2014 Dec 9.

Muscle mitohormesis promotes cellular survival via serine/glycine pathway flux.

Author information

1
*German Institute of Human Nutrition, Potsdam-Rehbruecke, Germany; Human and Animal Physiology, Wageningen University, Wageningen, The Netherlands; and Biomedical Research Institute, University of Lleida, Lleida, Spain.
2
*German Institute of Human Nutrition, Potsdam-Rehbruecke, Germany; Human and Animal Physiology, Wageningen University, Wageningen, The Netherlands; and Biomedical Research Institute, University of Lleida, Lleida, Spain klaus@dife.de.

Abstract

Recent studies on mouse and human skeletal muscle (SM) demonstrated the important link between mitochondrial function and the cellular metabolic adaptation. To identify key compensatory molecular mechanisms in response to chronic mitochondrial distress, we analyzed mice with ectopic SM respiratory uncoupling in uncoupling protein 1 transgenic (UCP1-TG) mice as model of muscle-specific compromised mitochondrial function. Here we describe a detailed metabolic reprogramming profile associated with mitochondrial perturbations in SM, triggering an increased protein turnover and amino acid metabolism with induced biosynthetic serine/1-carbon/glycine pathway and the longevity-promoting polyamine spermidine as well as the trans-sulfuration pathway. This is related to an induction of NADPH-generating pathways and glutathione metabolism as an adaptive mitohormetic response and defense against increased oxidative stress. Strikingly, consistent muscle retrograde signaling profiles were observed in acute stress states such as muscle cell starvation and lipid overload, muscle regeneration, and heart muscle inflammation, but not in response to exercise. We provide conclusive evidence for a key compensatory stress-signaling network that preserves cellular function, oxidative stress tolerance, and survival during conditions of increased SM mitochondrial distress, a metabolic reprogramming profile so far only demonstrated for cancer cells and heart muscle.

KEYWORDS:

amino acid metabolism; metabolic reprogramming; mitochondrial myopathy; oxidative stress tolerance; polyamines

PMID:
25491309
DOI:
10.1096/fj.14-261503
[Indexed for MEDLINE]

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