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Related Experiment Video

Updated: Jun 25, 2026

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
08:42

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

Published on: October 22, 2014

Endothelial dysfunction and vascular disease.

P M Vanhoutte1, H Shimokawa, E H C Tang

  • 1Department of Pharmacology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong. vanhoutt@hku.hk

Acta Physiologica (Oxford, England)
|February 18, 2009
PubMed
Summary
This summary is machine-generated.

The endothelium regulates blood vessel tone via nitric oxide (NO) and endothelium-dependent hyperpolarizations (EDHF). Impaired NO release and enhanced endothelium-derived contracting factors (EDCF) contribute to vascular disease.

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Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test
06:35

Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test

Published on: April 27, 2016

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Last Updated: Jun 25, 2026

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
08:42

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research

Published on: October 22, 2014

Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test
06:35

Ultrasound Assessment of Endothelial Function: A Technical Guideline of the Flow-mediated Dilation Test

Published on: April 27, 2016

Area of Science:

  • Vascular Biology
  • Endothelial Function
  • Smooth Muscle Physiology

Background:

  • The endothelium modulates vascular smooth muscle tone through vasodilator and constrictor factors.
  • Endothelium-derived relaxing factor (EDRF), primarily nitric oxide (NO), and endothelium-dependent hyperpolarizations (EDHF) mediate vasodilation.
  • Endothelium-derived contracting factors (EDCF), such as prostanoids, can cause vasoconstriction.

Purpose of the Study:

  • To review the mechanisms of endothelium-dependent relaxations and contractions.
  • To discuss factors influencing nitric oxide (NO) release and its relevance in vascular health and disease.
  • To explore the role of EDCF in vascular dysfunction, particularly when NO production is impaired.

Main Methods:

  • Literature review of studies on endothelial function, nitric oxide, and vascular tone.
  • Analysis of signaling pathways involving G(i) and G(q) proteins in endothelium-dependent responses.
  • Examination of the impact of vascular disease and interventions on endothelial factor release.

Main Results:

  • Endothelium-dependent relaxations involve both NO and EDHF, mediated by G(i) and G(q) proteins.
  • Nitric oxide (NO) release is subject to regulation and is reduced in conditions like diabetes and hypertension.
  • Regenerated endothelium may lose pathways for NO release, promoting vasospasm and inflammation.
  • EDCF-mediated contractions are amplified when NO production is compromised, contributing to impaired vasodilation in aging and hypertension.

Conclusions:

  • Endothelial dysfunction, characterized by reduced NO bioavailability and increased EDCF activity, plays a critical role in vascular diseases.
  • Understanding these mechanisms is crucial for developing therapeutic strategies targeting endothelial function.
  • Imbalances in vasodilator and constrictor factors contribute significantly to the pathophysiology of hypertension and atherosclerosis.