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Related Concept Videos

Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

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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...
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Coronary Artery Disease II: Pathophysiology01:26

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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...
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Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
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Antianginal Drugs: Nitrates and β-Blockers01:16

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In cardiovascular health, antianginal drugs combat angina pectoris — a condition marked by chest pain owing to diminished blood flow to the heart.
Organic nitrates,  such as nitroglycerin, play a pivotal role. Once metabolized, they liberate nitric oxide, a molecular marvel. Nitric oxide triggers guanylyl cyclase and augments cGMP production. This biochemical cascade orchestrates the relaxation of vascular smooth muscles, ushering in vasodilation and enhancing coronary blood flow....
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Paracrine signaling allows cells to communicate with their immediate neighbors via secretion of signaling molecules. Such a signal can only trigger a response in nearby target cells because the signal molecules degrade quickly or are inactivated if not taken up. Prominent examples of paracrine signaling include nitric oxide signaling in blood vessels, synaptic signaling of neurons, the blood clotting system, tissue repair/wound healing, and local allergic skin reactions. Nitric oxide as a...
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Hypertension II: Pathophysiology01:29

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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Updated: Dec 26, 2025

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

Anthony R Cyr1, Lauren V Huckaby2, Sruti S Shiva3

  • 1Department of Surgery, University of Pittsburgh Medical Center, F679 Presbyterian University Hospital, 200 Lothrop Street, Pittsburgh, PA 15213, USA. Electronic address: https://twitter.com/TonyCyr.

Critical Care Clinics
|March 17, 2020
PubMed
Summary
This summary is machine-generated.

Nitric oxide (NO) is vital for vascular homeostasis. Endothelial dysfunction, marked by reduced NO, disrupts this balance, impacting vascular health and leading to various diseases.

Keywords:
Endothelial dysfunctionNitric oxideNitric oxide synthase

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Area of Science:

  • Cardiovascular Biology
  • Molecular Medicine
  • Physiology

Background:

  • Nitric oxide (NO) is a key signaling molecule regulating vascular homeostasis.
  • Endothelial dysfunction, characterized by impaired NO production/sensitivity, underlies many diseases.
  • This dysfunction leads to prothrombotic, proinflammatory, and stiffened blood vessels.

Purpose of the Study:

  • To review the mechanisms of nitric oxide production and its downstream effects.
  • To highlight the role of NO signaling in organ system pathologies.
  • To underscore the importance of NO in maintaining vascular health.

Main Methods:

  • Literature review of nitric oxide signaling pathways.
  • Analysis of NO's role in endothelial function and dysfunction.
  • Examination of NO's involvement in various organ system diseases.

Main Results:

  • Nitric oxide is crucial for vasodilation and anti-inflammatory responses.
  • Endothelial dysfunction signifies a loss of NO-mediated vascular regulation.
  • Dysfunctional NO signaling contributes to a prothrombotic and proinflammatory vascular state.

Conclusions:

  • Nitric oxide is central to vascular homeostasis.
  • Endothelial dysfunction, driven by impaired NO signaling, is a critical factor in numerous pathologies.
  • Understanding NO mechanisms is key to addressing vascular diseases.