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Related Experiment Videos

Sarcoplasmic reticulum function abnormalities in rabbit failing hearts

N el H Bouanani1, J Perennec, A Ezzaher

  • 1Unité INSERM U400, Faculté de médecine, Créteil, France.

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|September 1, 1994
PubMed
Summary

Heart failure in rabbits showed decreased sarcoplasmic reticulum (SR) calcium uptake per protein but increased uptake per total ventricle, indicating SR hypertrophy. Altered T-tubule structure suggests impaired excitation-contraction coupling despite minimal SR biochemical changes.

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Area of Science:

  • Cardiovascular Physiology
  • Cellular Biology
  • Heart Failure Research

Background:

  • Heart failure involves complex alterations in cardiac excitation-contraction coupling.
  • Sarcoplasmic reticulum (SR) Ca2+ handling is critical for cardiomyocyte function.
  • Understanding SR adaptations in heart failure is essential for therapeutic development.

Purpose of the Study:

  • To investigate sarcoplasmic reticulum (SR) function and morphology in a rabbit model of heart failure.
  • To assess Ca2+ uptake and ryanodine receptor expression in failing hearts.
  • To correlate SR structural changes with functional alterations in excitation-contraction coupling.

Main Methods:

  • Induction of heart failure in rabbits via double volume and pressure overload.

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  • Measurement of sarcoplasmic reticulum (SR) Ca2+ uptake kinetics.
  • Analysis of ryanodine receptor density.
  • Electron microscopy to examine T-tubule morphology.

    • Main Results:

    • Sarcoplasmic reticulum (SR) Ca2+ uptake was reduced by 20% per milligram of protein in failing hearts (FH) compared to control hearts (CH).
    • Ryanodine receptor density was similar per protein but significantly increased per total left ventricle, suggesting SR hypertrophy.
    • Electron microscopy revealed hypertrophied T-tubules, indicating altered membrane-sarcomere relationships.

    Conclusions:

    • Despite minimal biochemical alterations in SR, SR hypertrophy occurs in this heart failure model.
    • Hypertrophied T-tubules suggest significant changes in excitation-contraction-relaxation coupling.
    • These structural and functional SR adaptations contribute to cardiac dysfunction in heart failure.