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Theaflavins decrease skeletal muscle wasting in disuse atrophy induced by hindlimb suspension in mice.

Kenta Suzuki1, Nayuta Hirashima1, Yasuyuki Fujii1

  • 1Department of Bio-science and Engineering, Shibaura Institute of Technology, 307 Fukasaku, Munumaku, Saitama 337-8570, Japan.

Journal of Clinical Biochemistry and Nutrition
|May 24, 2021
PubMed
Summary

Theaflavins help prevent muscle loss in mice experiencing disuse atrophy. This study shows theaflavins modulate protein metabolism, reducing muscle atrophy progression.

Keywords:
FoxO3ahindlimb suspensionskeletal muscle atrophytheaflavins

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Area of Science:

  • Biochemistry
  • Muscle Physiology
  • Nutraceuticals

Background:

  • Theaflavins, derived from tea, have previously shown potential in altering skeletal muscle metabolism.
  • Disuse muscle atrophy, a condition characterized by muscle mass loss due to inactivity, poses significant health challenges.

Purpose of the Study:

  • To investigate the efficacy of theaflavins in mitigating disuse muscle atrophy in a mouse model.
  • To explore the molecular mechanisms by which theaflavins influence muscle protein metabolism during atrophy.

Main Methods:

  • A hindlimb suspension model was used to induce muscle atrophy in mice.
  • Mice were divided into four groups: ground control, ground with theaflavins, suspension control, and suspension with theaflavins.
  • Theaflavins were administered at 250 mg/kg/day for two weeks, and muscle cross-sectional area, Akt/mTOR pathway signaling, and FoxO3a phosphorylation were analyzed.

Main Results:

  • Hindlimb suspension significantly reduced myotube size (cross-sectional area) in soleus and extensor digitorum longus muscles.
  • Theaflavin treatment significantly attenuated these reductions in muscle size.
  • Theaflavins modulated the phosphorylation of eukaryotic translation initiation factor 4E-binding protein 1 (4EBP-1) and altered the ratio of phosphorylated forkhead box O (FoxO) 3a in atrophying muscles.

Conclusions:

  • Theaflavins demonstrate a protective effect against disuse muscle atrophy in mice.
  • Theaflavins appear to exert their effects by modulating key protein metabolism pathways, including the Akt/mTOR and FoxO signaling pathways.
  • These findings suggest theaflavins as a potential therapeutic agent for preventing or treating muscle atrophy.