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Related Experiment Videos

Protease activated receptors modulate aortic vascular tone

H I Magazine1, J M King, K D Srivastava

  • 1Department of Biology, Queens College, City University of New York, Flushing 11367, USA. HIM$BIOL@QC1.QC.EDU

International Journal of Cardiology
|April 26, 1996
PubMed
Summary

Protease-activated receptors (PARs) activate nitric oxide release in rat aorta via endothelin-1. Thrombin receptor agonists cause contraction, while PAR-2 agonists only cause vasodilation.

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Area of Science:

  • Vascular biology
  • Pharmacology
  • Endocrinology

Background:

  • Protease-activated receptors (PARs) are key mediators in various physiological processes.
  • The roles of thrombin receptor and PAR-2 in regulating vascular tone and mediator release require further elucidation.

Purpose of the Study:

  • To investigate the effects of thrombin receptor and PAR-2 agonists on nitric oxide release and vascular tone in rat aorta.
  • To explore the involvement of endothelin-1 in PAR-mediated responses.

Main Methods:

  • Isolated rat aortic rings were stimulated with PAR agonists (Trap-14 and SLIGRL).
  • Nitric oxide release and endothelin-1 levels were measured.
  • Vascular contraction was assessed in endothelium-denuded aortic rings.
  • The effect of an ETB receptor antagonist (BQ-788) was evaluated.

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Main Results:

  • Both Trap-14 and SLIGRL induced rapid nitric oxide release, which was attenuated by BQ-788.
  • Endothelin-1 levels significantly increased after stimulation with Trap-14 or SLIGRL.
  • Trap-14 caused a dose-dependent contraction in endothelium-denuded aorta, while SLIGRL did not.

Conclusions:

  • Protease-activated receptors are functionally coupled to nitric oxide release in the rat aorta.
  • Thrombin receptor activation influences both vasodilation and contraction.
  • PAR-2 activation is primarily linked to vasodilation through nitric oxide release.