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Increase in rat soleus myotendinous interface after a 14-d spaceflight

S Roffino1, A Carnino, P Charpiot

  • 1Faculté des sciences du sport, Université de la Méditerranée, Marseille, France.

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|October 14, 1998
PubMed
Summary

Spaceflight alters skeletal muscle-tendon connections. A 14-day mission caused significant changes in rat soleus muscle myotendinous junctions, indicating adaptation to unloading conditions.

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Area of Science:

  • Muscle physiology
  • Space biology
  • Connective tissue research

Background:

  • Myotendinous junctions (MTJs) are critical for transmitting muscle forces to tendons.
  • Understanding MTJ adaptations to microgravity is vital for astronaut health and performance.

Purpose of the Study:

  • To investigate the effects of a 14-day spaceflight on the ultrastructure and morphology of rat soleus muscle MTJs.
  • To elucidate the adaptive mechanisms of MTJs under unloading conditions.

Main Methods:

  • Male adult Sprague Dawley rats were subjected to 14 days of spaceflight.
  • Transmission electron microscopy and histomorphometric techniques were employed to analyze soleus muscle MTJs.
  • Morphological changes and junctional membrane dimensions were quantified.
Keywords:
NASA Experiment Number SLS2 CNES2

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Main Results:

  • Spaceflight led to a 58% increase in the junctional membrane length relative to muscle fiber diameter.
  • MTJs exhibited a 'shredded' appearance with T tubule dilatation, mitochondrial swelling, and Z-disk streaming.
  • Evidence of basal lamina and junctional membrane remodeling was observed, suggesting extracellular matrix involvement.

Conclusions:

  • Spaceflight induces significant structural remodeling of myotendinous junctions in the soleus muscle.
  • These adaptations appear to be a response to unloading, potentially involving extracellular matrix spreading and reduced mechanical constraints.