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Isoproterenol-dependent decrease in oxygen uptake and respiratory enzyme activities in rat myocardial tissue and

J J Poderoso1, S Fernandez, M C Carreras

  • 1Laboratory of Oxygen Metabolism, University Hospital, School of Medicine, University of Buenos Aires, Argentina.

Critical Care Medicine
|October 1, 1995
PubMed
Summary
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Isoproterenol decreases myocardial oxygen uptake by affecting mitochondrial function, despite increasing overall heart oxygen demand. Alpha-adrenergic inhibitors can counteract this effect, suggesting a complex interaction in cardiac metabolism.

Area of Science:

  • Cardiovascular Physiology
  • Mitochondrial Metabolism
  • Adrenergic Pharmacology

Background:

  • Isoproterenol-induced myocardial damage is traditionally linked to increased cardiac oxygen demand.
  • A potential direct effect of isoproterenol on tissue and mitochondrial oxidative metabolism requires investigation.

Purpose of the Study:

  • To investigate the direct effects of isoproterenol on myocardial tissue and mitochondrial oxidative metabolism.
  • To compare these effects with other adrenergic agents, considering the role of adrenergic inhibitors.

Main Methods:

  • A prospective, dose-response study was conducted using Sprague-Dawley female rats.
  • Myocardial slices and isolated mitochondria were used to assess oxygen uptake and enzyme activities.
  • Hearts were perfused in the Langendorff manner, and oxygen consumption was measured polarographically.

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Main Results:

  • Isoproterenol dose-dependently decreased oxygen uptake in myocardial slices.
  • Isolated mitochondria from isoproterenol-perfused hearts showed reduced respiratory rates and control ratios.
  • Epinephrine and norepinephrine did not affect oxygen uptake unless alpha-adrenergic inhibitors were present.

Conclusions:

  • Isoproterenol exhibits a dual effect: increasing in vivo cardiac oxygen demand while decreasing in vitro mitochondrial oxygen uptake.
  • This inhibitory action on mitochondrial respiration is likely mediated by effects on respiratory enzymes.
  • Alpha-adrenergic agonists may counteract the negative impact of isoproterenol on mitochondrial function.