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Related Concept Videos

Nitric Oxide Signaling Pathway01:28

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...
Treatment for Pulmonary Arterial Hypertension: Phosphodiesterase Inhibitors01:28

Treatment for Pulmonary Arterial Hypertension: Phosphodiesterase Inhibitors

Phosphodiesterase 5 (PDE5) inhibitors are potent enzymes that function to hydrolyze cyclic nucleotides to their corresponding 5' monophosphates. Their unique biochemical properties have been applied in treating Pulmonary Arterial Hypertension (PAH).
Among the PDE5 inhibitors, sildenafil (Revatio) stands out as a competitive and selective inhibitor. It operates by elevating cellular levels of cGMP and augmenting signaling through the cGMP-PKG pathway, promoting vasodilation. Upon oral...
Male Sexual Response: Erection & Ejaculation01:17

Male Sexual Response: Erection & Ejaculation

Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...
Disorders of the Male Reproductive System01:20

Disorders of the Male Reproductive System

Men's health issues are increasingly recognized as significant, with several conditions posing common threats. Among these, testicular cancer is especially prevalent in younger men, particularly those aged 20 to 35 years. The disease often manifests as a painless mass in the testicles, sometimes accompanied by a sensation of heaviness or a dull ache.
Prostate disorders are another major concern. These conditions can impair urinary flow due to the prostate's location around the urethra. Symptoms...
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...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

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Related Experiment Video

Updated: Jun 15, 2026

Isolation of Adipose Derived Regenerative Cells for the Treatment of Erectile Dysfunction Following Radical Prostatectomy
09:49

Isolation of Adipose Derived Regenerative Cells for the Treatment of Erectile Dysfunction Following Radical Prostatectomy

Published on: December 28, 2021

[Erectile dysfunction and cavernosal endothelial cells].

M Galiano1, G Pignot, C Costa

  • 1Service d'urologie, institut mutualiste Montsouris, université Paris-Descartes, 42, boulevard Jourdan, 75014 Paris, France. marc.galiano@imm.fr

Progres En Urologie : Journal De L'Association Francaise D'Urologie Et De La Societe Francaise D'Urologie
|March 17, 2010
PubMed
Summary
This summary is machine-generated.

Erectile dysfunction (ED) involves complex factors, with the cavernosal endothelium playing a key role in erection. Understanding endothelial function reveals pathological mechanisms underlying ED, highlighting nitric oxide (NO) pathways.

Related Experiment Videos

Last Updated: Jun 15, 2026

Isolation of Adipose Derived Regenerative Cells for the Treatment of Erectile Dysfunction Following Radical Prostatectomy
09:49

Isolation of Adipose Derived Regenerative Cells for the Treatment of Erectile Dysfunction Following Radical Prostatectomy

Published on: December 28, 2021

Area of Science:

  • Physiology
  • Urology
  • Cell Biology

Context:

  • Erectile dysfunction (ED) is a multifactorial condition impacting male sexual health.
  • The cavernosal endothelium's role in smooth muscle cell regulation is crucial for understanding erection physiology.
  • Current knowledge on endothelial function provides insight into the pathological mechanisms of ED.

Purpose:

  • To synthesize current knowledge on endothelial function in the context of erectile physiology.
  • To elucidate the pathological mechanisms responsible for erectile dysfunction.
  • To provide a foundation for understanding the biological activities of the endothelium in erectile function.

Summary:

  • The endothelium facilitates smooth muscle relaxation via the nitric oxide/cyclic guanosine monophosphate (NO/cGMP) and adenylyl cyclase/cyclic adenosine monophosphate (AC/cAMP) pathways, essential for erection.
  • Risk factors like diabetes mellitus, hypertension, and hypercholesterolemia induce endothelial alterations through oxidative stress, impaired NO production, and reduced vascular endothelial growth factor (VEGF) expression.
  • Similar cellular mechanisms are implicated in age-related endothelial dysfunction contributing to ED.

Impact:

  • Enhances understanding of the physiological underpinnings of erectile function.
  • Identifies key molecular pathways and risk factors contributing to erectile dysfunction.
  • Provides a basis for future research into hemodynamic evaluation and therapeutic strategies for ED.