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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...
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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2, D-Pen5]-enkephalin or DPDPE for...
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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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Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...
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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
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Interactions between morphine and nitric oxide in various organs.

Noboru Toda1, Shiroh Kishioka, Yoshio Hatano

  • 1Toyama Institute for Cardiovascular Pharmacology Research, Chuo-ku, Osaka, Japan.

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Nitric oxide (NO) modulates morphine's effects on the central nervous system and other bodily systems. Understanding these interactions is key to minimizing adverse reactions during pain therapy.

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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:

  • Physiology
  • Pharmacology
  • Neuroscience

Background:

  • Nitric oxide (NO) is a crucial intercellular messenger in physiological and pathophysiological processes.
  • NO influences the beneficial and adverse effects of therapeutic agents.
  • Endogenous NO is synthesized by constitutive and inducible nitric oxide synthases (NOS) in various cell types.

Purpose of the Study:

  • To explore the modulatory role of NO in morphine's actions across different physiological systems.
  • To investigate the reciprocal regulation of NO bioavailability by morphine.
  • To highlight the significance of NO-morphine interactions for optimizing analgesic therapy.

Main Methods:

  • Literature review and synthesis of existing research on NO and opioid interactions.
  • Analysis of NO's influence on morphine's effects in the central nervous system (CNS) and peripheral systems.
  • Examination of morphine's impact on NO production and signaling pathways.

Main Results:

  • NO significantly modulates morphine's effects on CNS functions including learning, memory, and thermoregulation.
  • NO influences morphine's actions on cardiovascular, digestive, and respiratory systems.
  • Morphine affects NO bioavailability, and NO produced by inducible NOS contributes to certain morphine-induced immune responses.

Conclusions:

  • The interaction between NO and morphine is complex, impacting multiple organ systems.
  • Understanding these interactions is vital for developing strategies to mitigate side effects of opioid analgesics.
  • Targeting NO pathways could offer novel approaches to enhance pain management and reduce adverse events.