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Related Concept Videos

Treatment for Pulmonary Arterial Hypertension: Endothelin Receptor Antagonists01:18

Treatment for Pulmonary Arterial Hypertension: Endothelin Receptor Antagonists

Endothelins (ETs) are potent vasoactive peptides critical in the human body's various physiological and pathological processes. One of the most promising therapeutic strategies for treating pulmonary arterial hypertension (PAH) involves counteracting the effects of these endothelins using a class of drugs known as endothelin receptor antagonists.
ETs are synthesized through a complex sequence of enzymatic steps, primarily involving an enzyme referred to as endothelin-converting enzyme (ECE). Of...
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Nitric Oxide Signaling Pathway

Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
Male Sexual Response: Erection & Ejaculation01:17

Male Sexual Response: Erection & Ejaculation

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Updated: Jun 5, 2026

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
07:46

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000

Published on: October 15, 2010

Endothelins & erectile dysfunction.

Robert Ritchie1, Mark Sullivan

  • 1Department of Urology, Churchill Hospital, Oxford OX37LJ, UK. robritchie1@gmail.com

Pharmacological Research
|December 28, 2010
PubMed
Summary
This summary is machine-generated.

Endothelins, potent vasoconstrictors, may play a role in erectile dysfunction (ED), particularly in conditions like diabetes. However, clinical evidence for endothelin antagonists in treating ED remains inconclusive, necessitating further research.

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Last Updated: Jun 5, 2026

Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
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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

Area of Science:

  • Urology
  • Cardiovascular Physiology
  • Endocrinology

Background:

  • Erectile dysfunction (ED) significantly impacts men's quality of life.
  • Normal erectile function depends on complex neural coordination and vascular dynamics.
  • Endothelins are potent vasoconstrictors influencing smooth muscle contraction in the corpora cavernosa.

Purpose of the Study:

  • To investigate the unclear role of endothelins in the pathogenesis of erectile dysfunction.
  • To explore the potential of endothelin receptor antagonists in managing ED.
  • To clarify the relevance of the endothelin system in specific conditions associated with ED.

Main Methods:

  • Review of proposed mechanisms of endothelin action on corporal smooth muscle.
  • Analysis of clinical studies on endothelin levels in patients with ED, including diabetes mellitus.
  • Evaluation of animal and clinical data regarding endothelin receptor antagonists for ED treatment.

Main Results:

  • Elevated endothelin-1 levels are observed in diabetes, a potential ED contributor, but clinical data is inconsistent.
  • Animal studies show endothelin antagonists improve erectile function and protect against apoptosis.
  • Clinical studies on endothelin receptor antagonists in ED have yielded less promising results.

Conclusions:

  • The precise role of endothelins in erectile dysfunction pathogenesis remains uncertain.
  • Endothelin antagonists may be beneficial in specific patient groups with global endothelial dysfunction, such as diabetes mellitus.
  • Further research is needed to clarify the endothelin system's relevance and therapeutic potential in ED.