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Related Experiment Videos

Systolic ventricular dysfunction causes selective diaphragm atrophy in rats

G Stassijns1, G Gayan-Ramirez, P De Leyn

  • 1Respiratory Muscle Research Unit, Laboratory for Pneumology and Respiratory Division, University Hospitals, Katholieke Universiteit Leuven, Belgium.

American Journal of Respiratory and Critical Care Medicine
|December 16, 1998
PubMed
Summary

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Systolic ventricular dysfunction selectively caused diaphragm atrophy in rats, linked to infarct size and increased insulin-like growth factor-I (IGF-I) expression. Compensatory mechanisms may minimize fiber atrophy.

Area of Science:

  • Cardiology
  • Physiology
  • Skeletal Muscle Biology

Background:

  • Systolic ventricular dysfunction (VD) can impair skeletal muscle function.
  • The specific impact on the diaphragm versus other skeletal muscles is not fully understood.
  • Investigating the role of insulin-like growth factor-I (IGF-I) may elucidate underlying mechanisms.

Purpose of the Study:

  • To compare diaphragm and other skeletal muscle structure and function in rats with induced VD.
  • To examine alterations in serum and tissue IGF-I levels in VD.
  • To identify potential compensatory mechanisms in the diaphragm.

Main Methods:

  • Induction of VD via left coronary artery ligation in rats.
  • Comparison of diaphragm and skeletal muscle weight, contractile properties, and fiber cross-sectional area (CSA).

Related Experiment Videos

  • Measurement of serum IGF-I levels and IGF-I expression in the liver, diaphragm, and gastrocnemius.

    • Main Results:

    • VD rats exhibited significant diaphragm atrophy (weight reduction) and decreased type I and IIx/b fiber CSA, unrelated to myopathic changes.
    • No significant alterations were observed in other skeletal muscles.
    • Diaphragm IGF-I mRNA expression increased, while serum and other tissue levels remained unchanged.

    Conclusions:

    • Systolic VD leads to selective diaphragm atrophy, correlated with infarct size.
    • Compensatory mechanisms, potentially involving increased local IGF-I expression, may mitigate severe diaphragmatic fiber atrophy.
    • The diaphragm's vulnerability may relate to the moderate degree of ventricular dysfunction.