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Nitric Oxide Signaling Pathway01:28

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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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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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Open Angle Glaucoma: Treatment01:27

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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...
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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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Updated: Oct 30, 2025

Application of Genetically Encoded Fluorescent Nitric Oxide (NO•) Probes, the geNOps, for Real-time Imaging of NO• Signals in Single Cells
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Nitric Oxide Interaction with the Eye.

Nir Erdinest1, Naomi London2, Haim Ovadia3

  • 1Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel.

Vision (Basel, Switzerland)
|July 2, 2021
PubMed
Summary

Nitric oxide (NO) is a key messenger in the eye, influencing vision, inflammation, and healing. Understanding NO

Keywords:
glaucomamyopianitric oxide

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Area of Science:

  • Ophthalmology
  • Physiology
  • Immunology

Background:

  • Nitric oxide (NO) is a crucial intercellular messenger with established roles in cardiovascular, nervous, and immune systems.
  • Its prevalence and specific functions within the ocular system have been less extensively reviewed.

Purpose of the Study:

  • To comprehensively review the multifaceted roles of nitric oxide (NO) within the ocular system.
  • To elucidate NO's involvement in ocular homeostasis, disease pathogenesis, and therapeutic strategies.

Main Methods:

  • Literature review of existing research on nitric oxide in ocular tissues and functions.
  • Synthesis of findings related to NO's impact on corneal cells, retinal cells, and ocular vasculature.

Main Results:

  • NO is present in corneal and retinal cells, modulating immune, inflammation, and wound-healing processes.
  • NO acts as a vascular endothelial relaxant, affecting choroidal blood flow and influencing conditions like age-related macular degeneration, diabetic retinopathy, and glaucoma.
  • NO's balance is critical for ocular homeostasis, impacting intraocular pressure, aqueous outflow, axial elongation, and myopia development.

Conclusions:

  • Nitric oxide plays a significant and diverse role in maintaining ocular health and function.
  • Dysregulation of NO contributes to various ocular pathologies, highlighting its therapeutic potential.
  • Targeting NO pathways offers promising avenues for treating a range of eye diseases.