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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...
Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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...
Antihypertensive Drugs: Vasodilators01:23

Antihypertensive Drugs: Vasodilators

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...
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
Paracrine Signaling01:21

Paracrine Signaling

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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Related Experiment Video

Updated: Jul 13, 2026

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
08:23

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

Nitric oxide and hypoxia.

Alexander Galkin1, Annie Higgs, Salvador Moncada

  • 1The Wolfson Institute for Biomedical Research, The Cruciform Building, University College London, Gower Street, London WC1E 6BT, U.K.

Essays in Biochemistry
|August 21, 2007
PubMed
Summary
This summary is machine-generated.

Nitric oxide (NO) reversibly interacts with mitochondrial complex IV, impacting cellular respiration and defense mechanisms. This interaction influences metabolic hypoxia and gene regulation, with implications for various physiological and pathological conditions.

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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
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Analytical Techniques for Assaying Nitric Oxide Bioactivity
11:28

Analytical Techniques for Assaying Nitric Oxide Bioactivity

Published on: June 18, 2012

Area of Science:

  • Biochemistry
  • Cellular Respiration
  • Mitochondrial Function

Background:

  • Nitric oxide (NO) is a signaling molecule with known interactions within cellular pathways.
  • Mitochondrial function, particularly the electron transport chain, is crucial for cellular energy production.
  • The interplay between NO and oxygen metabolism is complex and impacts cellular homeostasis.

Purpose of the Study:

  • To elucidate the physiological and pathophysiological implications of nitric oxide (NO) interactions with cytochrome c oxidase (complex IV).
  • To explore how NO affects mitochondrial respiration and cellular defense mechanisms.

Main Methods:

  • Discussion of existing literature on NO's interaction with cytochrome c oxidase (complex IV).
  • Analysis of NO's effects on mitochondrial respiration under varying oxygen concentrations.
  • Review of NO's role in signaling pathways involving reactive oxygen species, nuclear factor kappaB, and AMP kinase.

Main Results:

  • NO reversibly interacts with cytochrome c oxidase (complex IV) in competition with oxygen.
  • Low NO concentrations trigger cellular defense responses and can cause metabolic hypoxia by inhibiting respiration.
  • NO can prevent hypoxia-inducible transcription factor stabilization and, via peroxynitrite formation, affect mitochondrial complex I activity through S-nitrosation.

Conclusions:

  • Nitric oxide significantly modulates mitochondrial function and cellular responses.
  • Understanding NO-cytochrome c oxidase interactions is key to comprehending metabolic regulation and cellular defense.
  • These interactions have broad implications for both normal physiology and various pathological states.