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Related Concept Videos

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...
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...
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...
Coronary Artery Disease II: Pathophysiology01:26

Coronary Artery Disease II: Pathophysiology

Coronary Artery Disease (CAD) originates from a series of events that impair the function of coronary arteries, the blood vessels responsible for delivering oxygen-rich blood to the heart muscle. The pathophysiology of CAD is closely linked to atherosclerosis, a chronic inflammatory and lipid-driven condition affecting the vascular endothelium.1. Endothelial DamageThe process begins with damage to the vascular endothelium, which serves as a protective barrier between the blood and the vessel...
Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...

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Updated: Jun 15, 2026

Production and Detection of Reactive Oxygen Species (ROS) in Cancers
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Production and Detection of Reactive Oxygen Species (ROS) in Cancers

Published on: November 21, 2011

[Reactive oxygen species and erectile dysfunction].

Qi Zhang1, Jing-Ya Yi, Xue-Jun Shang

  • 1Department of Pharmacology, Nanjing Industrial University Technology, Nanjing, Jiangsu 210009, China. nancyzhang03@hotmail.com

Zhonghua Nan Ke Xue = National Journal of Andrology
|February 26, 2010
PubMed
Summary

Reactive oxygen species (ROS) play a key role in erectile dysfunction (ED), a common male condition. This review explores the link between ROS, ED risk factors, and emerging anti-oxidation therapies for improved treatment.

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Last Updated: Jun 15, 2026

Production and Detection of Reactive Oxygen Species (ROS) in Cancers
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Production and Detection of Reactive Oxygen Species (ROS) in Cancers

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En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries
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En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries

Published on: February 25, 2016

Area of Science:

  • Urology
  • Oxidative Stress Research
  • Male Reproductive Health

Context:

  • Erectile dysfunction (ED) affects a significant global male population.
  • Growing evidence highlights the involvement of reactive oxygen species (ROS) in ED pathogenesis.
  • Understanding the interplay between ROS and ED is crucial for developing effective treatments.

Purpose:

  • To review current research on the role of ROS in ED.
  • To elucidate the relationship between ROS and established ED risk factors.
  • To outline recent advancements in anti-oxidation strategies for ED.

Summary:

  • This paper synthesizes research on reactive oxygen species (ROS) and their significant role in erectile dysfunction (ED).
  • It details how ROS contribute to ED development and interact with various risk factors.
  • The review also covers the latest progress in anti-oxidation treatments targeting ED.

Impact:

  • Provides a comprehensive overview of ROS in ED for researchers and clinicians.
  • Highlights potential therapeutic targets for novel ED treatments.
  • Facilitates a deeper understanding of oxidative stress mechanisms in male sexual health.