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Related Experiment Videos

Cardiac function in rats with acute renal failure.

S C Robinson1, C J Bowmer, M S Yates

  • 1Department of Pharmacology, University of Leeds, UK.

The Journal of Pharmacy and Pharmacology
|December 1, 1992
PubMed
Summary
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Acute renal failure (ARF) in rats alters cardiac responses to stimulants. Hearts show impaired calcium handling and mitochondrial function, potentially affecting contractility.

Area of Science:

  • Cardiology
  • Nephrology
  • Mitochondrial Physiology

Background:

  • Acute renal failure (ARF) can impact cardiovascular function.
  • Understanding cardiac alterations in ARF is crucial for patient management.

Purpose of the Study:

  • To investigate the inotropic responses of cardiac preparations in rats with glycerol-induced ARF.
  • To explore the underlying mechanisms of cardiac dysfunction in ARF, focusing on mitochondrial function and calcium handling.

Main Methods:

  • Isolated cardiac preparations (left atria, right ventricular strips) from rats with ARF were subjected to various cardiac stimulants.
  • Cardiac mitochondrial respiration and oxidative phosphorylation were assessed.
  • Pyruvate dehydrogenase activity was measured as an index of mitochondrial calcium levels.

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Main Results:

  • Left atria showed diminished responses to the calcium agonist Bay K 8644.
  • Right ventricular strips exhibited reduced responses to isoprenaline, 3-isobutyl-1-methylxanthine, Ca2+, and Bay K 8644.
  • ARF induced a 'pseudo' uncoupling of mitochondrial oxidative phosphorylation without affecting electron transport or cellular energy charge.
  • Active pyruvate dehydrogenase levels increased significantly in ARF hearts, indicating altered mitochondrial calcium uptake.

Conclusions:

  • Hearts from rats with ARF exhibit altered L-type calcium channel function, specifically the dihydropyridine receptor.
  • Defective cellular calcium control in the ventricle, leading to increased mitochondrial calcium uptake, may contribute to depressed cardiac contractility in ARF.
  • These findings highlight significant cardiac adaptations in response to acute renal failure.