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Related Experiment Videos

Streptomycin and EDTA decrease the number of desmin-negative fibers following stretch injury.

Mark E T Willems1, William T Stauber

  • 1Department of Physiology and Pharmacology, West Virginia University, Morgantown, West Virginia 26506, USA.

Muscle & Nerve
|June 11, 2005
PubMed
Summary

Extracellular calcium plays a role in muscle injury. Streptomycin and EDTA treatments reduced muscle fiber damage but did not prevent force loss, dissociating weakness from inflammation.

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Area of Science:

  • Muscle Physiology
  • Cellular Biology
  • Biochemistry

Background:

  • Extracellular calcium is crucial for muscle function.
  • Stretch-induced muscle injury involves complex cellular mechanisms.
  • The relationship between force deficits and histological damage is not fully understood.

Purpose of the Study:

  • To investigate the role of extracellular calcium in stretch-induced muscle injury.
  • To determine if reducing extracellular calcium affects muscle force or structural damage.
  • To explore the dissociation between functional deficits and histopathological changes.

Main Methods:

  • Rats were treated with streptomycin or ethylene diamine tetraacetic acid (EDTA) to reduce extracellular calcium.
  • Muscle injury was induced via repeated stretches of dorsiflexor muscles.

Related Experiment Videos

  • Isometric force production and tibialis anterior muscle histology were assessed post-injury.

    • Main Results:

    • Streptomycin and EDTA treatments significantly reduced the percentage of injured myofibers.
    • No significant difference in isometric force loss was observed between treated and control groups.
    • Histopathological damage was largely abolished by treatments, while force deficits remained.

    Conclusions:

    • Extracellular calcium influences the development of histopathological changes in muscle injury.
    • Muscle weakness and structural damage following strain injury can be dissociated.
    • These findings help explain the lack of correlation between force deficits and cellular pathology.