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Related Experiment Videos

Active immunization against endothelin-1 is associated with a decrease in plasma endothelin-1 and changes in vascular

M A Grafov1, S A Gavrilova, Rubina AYu

  • 1Department of Pharmacology, Faculty of Basic Medicine, Lomonosov Moscow State University, Vorobjovy Gory, Russia. mgrafov@fbm.msu.ru

Journal of Cardiovascular Pharmacology
|November 15, 2000
PubMed
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Endogenous endothelin-1 (ET-1) plays a role in vascular reactivity. Depleting ET-1 in rats altered blood vessel responses to vasoactive substances, impacting blood pressure.

Area of Science:

  • Cardiovascular Physiology
  • Endocrinology
  • Vascular Biology

Background:

  • Exogenous endothelin-1 (ET-1) significantly impacts vascular reactivity.
  • Pathological conditions can lead to high concentrations of ET-1, affecting blood vessels.

Purpose of the Study:

  • To investigate the role of endogenous ET-1 in vascular responsiveness.
  • To evaluate the effects of ET-1 deficiency on conduit and resistant-like vessels.

Main Methods:

  • Wistar rats were actively immunized against ET-1 to create ET-1-deficient animals.
  • Vascular reactivity was assessed in isolated aorta and perfused tail arteries.
  • Hemodynamic parameters including mean arterial pressure and heart rate were monitored.

Main Results:

Related Experiment Videos

  • ET-1 deficient rats showed reduced plasma ET-1 levels (1.9 fmol/ml vs 4.9 fmol/ml).
  • Aorta rings from ET-1 deficient rats had decreased sensitivity to ET-1 (EC50 = 6.57 nM vs 2.95 nM).
  • Tail arteries exhibited diminished responses to ET-1 and reduced endothelium-dependent relaxation to acetylcholine.

Conclusions:

  • Depletion of circulating ET-1 induces subtle hemodynamic changes.
  • ET-1 deficiency alters vessel responsiveness to vasoactive substances.
  • Endogenous ET-1 is crucial for normal vascular function and reactivity.