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Type I muscle atrophy caused by microgravity-induced decrease of myocyte enhancer factor 2C (MEF2C) protein

M Yamakuchi1, I Higuchi, S Masuda

  • 1Department of Molecular Laboratory Medicine, Kagoshima University School of Medicine, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan.

FEBS Letters
|July 19, 2000
PubMed
Summary
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Spaceflight causes muscle atrophy by altering gene expression. Myocyte-specific enhancer binding factor 2C (MEF2C) is identified as a key factor in muscle atrophy and regeneration.

Area of Science:

  • Molecular biology
  • Space physiology
  • Muscle biology

Background:

  • Microgravity exposure during spaceflight is known to induce skeletal muscle atrophy.
  • The specific molecular mechanisms underlying muscle loss in microgravity remain incompletely understood.

Purpose of the Study:

  • To investigate the molecular mechanisms of muscle atrophy in paraspinal muscles under microgravity conditions.
  • To identify key molecular players involved in microgravity-induced muscle atrophy and subsequent regeneration.

Main Methods:

  • Analysis of rat paraspinal muscles after 14 days of spaceflight and comparison with ground controls.
  • Gene expression profiling to identify changes in microgravity.
  • Northern blotting to assess specific gene expression levels, including myocyte-specific enhancer binding factor 2C (MEF2C).

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Main Results:

  • Microgravity altered the expression of 42 genes, with increased levels of heat shock protein 70 and t complex polypeptide 1.
  • Expression of myocyte-specific enhancer binding factor 2C (MEF2C) and related genes (aldolase A, muscle ankyrin) decreased.
  • Following 9 days of ground recovery, MEF2C expression increased and localized to satellite cells in a muscle regeneration state.

Conclusions:

  • Myocyte-specific enhancer binding factor 2C (MEF2C) plays a crucial role in skeletal muscle atrophy induced by microgravity.
  • MEF2C is also implicated in the muscle regeneration process following microgravity exposure.
  • Understanding MEF2C's function may lead to strategies for mitigating muscle loss in space.