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Related Experiment Videos

Phosphorylated compounds and function in isolated hearts: a 31P-NMR study.

J Aussedat1, A Ray, S Lortet

  • 1Laboratoire de Physiologie Cellulaire Cardiaque, Centre National de la Recherche Scientifique, Unité Associée 632, Affiliée à l'Institut National de la Santé et de la Recherche Médicale, Grenoble, France.

The American Journal of Physiology
|January 1, 1991
PubMed
Summary

Phosphorylated compounds like inorganic phosphate and creatine phosphate regulate myocardial cell respiration. Changes in these molecules control heart workload under normal oxygen conditions, similar to skeletal muscle.

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Area of Science:

  • Cardiology
  • Biochemistry
  • Physiology

Background:

  • Myocardial cell respiration is crucial for heart function.
  • Phosphorylated compounds play a role in cellular energy metabolism.
  • Understanding the regulation of heart workload is vital for cardiovascular health.

Purpose of the Study:

  • To investigate the role of phosphorylated compounds in controlling myocardial cell respiration.
  • To determine the relationship between workload and phosphorylated compound levels in the heart.
  • To explore the potential of using 31P-NMR spectroscopy for this investigation.

Main Methods:

  • Isolated isovolumic rat hearts were perfused with a glucose-pyruvate medium.
  • Cardiac workload was manipulated by altering calcium concentration in the perfusion fluid.

Related Experiment Videos

  • 31P-nuclear magnetic resonance (NMR) spectroscopy was used to measure phosphorylated compounds.

    • Main Results:

    • Left ventricular developed pressure (LVDP) changed with calcium concentration.
    • The inorganic phosphate-to-creatine phosphate ratio ([Pi]/[PCr]) altered with LVDP, while ATP remained constant.
    • A Michaelis-Menten relationship was observed between [Pi]/[PCr] and LVDP.

    Conclusions:

    • Mitochondrial activity in the rat heart is likely controlled by phosphorylated compound concentrations under normoxic conditions.
    • These findings are consistent with observations in skeletal muscle.
    • The study provides insights into the in situ physiological regulation of heart energy metabolism.