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animal study + human observation · PMID 33446655

MOTS-c is an Exercise-Induced Mitochondrial-Encoded Regulator of Age-Dependent Physical Decline and Muscle Homeostasis — VialBase Research

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Last updated · 2021 · Reynolds, J.C., Lai, R.W., Woodhead, J.S.T., Joly, J.H., Mitchell, C.J., Cameron-Smith, D., Lu, R., Cohen, P., Graham, N.A., Benber, B., Merry, T.L., Lee, C. · Nature Communications
Key findings
  • MOTS-c translocates to the nucleus during metabolic stress and exercise
  • Regulates nuclear gene expression for metabolic adaptation
  • MOTS-c treatment improved physical performance in aged mice

Summary

This study demonstrated that MOTS-c is an exercise-induced mitochondrial signal that regulates age-dependent physical decline. The researchers showed that MOTS-c translocates to the nucleus during exercise and metabolic stress, where it regulates gene expression to promote metabolic homeostasis — functioning as a true exercise mimetic.

Key Findings

  • MOTS-c translocates from mitochondria to the nucleus during exercise and metabolic stress
  • In the nucleus, MOTS-c regulates expression of genes involved in metabolic adaptation
  • Interacts with AMPK-mediated stress response pathways
  • Exogenous MOTS-c treatment improved physical performance in aged mice
  • Endogenous MOTS-c levels increase with exercise in humans (skeletal muscle and plasma)
  • Positions MOTS-c as a “retrograde signal” from mitochondria to nucleus

Methodology

Combined mouse and human studies. Mouse: MOTS-c injection in young and aged mice with treadmill performance testing. Nuclear translocation studies via immunofluorescence and fractionation. Human: plasma MOTS-c measurement before and after exercise in young men. Gene expression profiling via RNA-seq.

Limitations

  • Exercise performance data from mice — may not directly translate to humans
  • Human component limited to observational plasma measurements
  • No human clinical trial of exogenous MOTS-c for physical performance
  • Mechanism of nuclear translocation not fully understood
  • MOTS-c is encoded in mitochondrial DNA — exogenous peptide may behave differently

Relevance to Content

The “exercise mimetic” angle is hugely compelling for content. MOTS-c as “exercise in a peptide” resonates with the target audience. The nuclear translocation mechanism (mitochondria communicating with the nucleus) is a sophisticated science story. Key for content positioning MOTS-c for aging, physical performance, and metabolic health.

See Also

View on PubMed · PMID 33446655 →