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Related Experiment Videos

Homocyst(e)ine impairs endocardial endothelial function.

S C Tyagi1, L M Smiley, V S Mujumdar

  • 1Department of Physiology and Biophysics, and Center of Excellence in Cardiovascular-Renal Research, The University of Mississippi Medical Center, Jackson 39216, USA.

Canadian Journal of Physiology and Pharmacology
|December 22, 1999
PubMed
Summary

Homocysteine impairs heart function by affecting the endocardial endothelium. It enhances cardiac contraction, particularly when combined with other substances like angiotensin II and endothelin.

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Area of Science:

  • Cardiovascular Science
  • Endothelial Biology
  • Cardiac Physiology

Background:

  • Homocysteine is known to damage vascular endothelium and affect vascular function.
  • The endothelium also plays a crucial role in the endocardium, suggesting a potential impact on cardiac function.

Purpose of the Study:

  • To investigate the hypothesis that homocysteine modulates endocardial endothelium (EE)-dependent cardiac function.
  • To explore the synergistic effects of homocysteine with angiotensin II (AII) and endothelin (ET) on cardiac contraction.

Main Methods:

  • Ex vivo cardiac rings from Wistar-Kyoto rats were used to measure contractile responses.
  • Isometric myobath techniques were employed with varying calcium chloride (CaCl2) concentrations.
  • Cardiac rings were pretreated with AII, ET, or nitric oxide synthase inhibitor (L-NAME) before homocysteine exposure.

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Main Results:

  • Homocysteine's contractile response was significantly increased in endothelial-denuded endocardium compared to intact endothelium.
  • Homocysteine acted synergistically with AII and ET to enhance cardiac contraction, an effect further amplified in the absence of endothelium.
  • Inhibition of nitric oxide synthesis potentiated the contractile response to homocysteine.

Conclusions:

  • Homocysteine impairs EE-dependent cardiac function.
  • Homocysteine exhibits synergistic effects with AII and ET, leading to enhanced cardiac contraction.
  • These findings highlight a novel mechanism by which homocysteine may negatively impact cardiac health.