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[Nitric oxide. Basic research and possible clinical use]

L Prónai¹, E Szaleczky, J Fehér

¹Semmelweis Orvostudományi Egyetem II. Belklinika.

|August 4, 1996

Summary

Nitric oxide (NO), a signaling molecule, has diverse physiological roles, acting as a neurotransmitter and vasodilator. Its dual nature means NO can be protective or toxic, influencing health and disease.

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Area of Science:

Biochemistry
Physiology
Molecular Biology

Context:

Nitric oxide (NO) was recognized as the molecule of the year in 1992.
NO is a small, unstable gas produced from L-arginine by NO-synthase.
Mammals possess at least three NO-synthase isoenzymes: neuronal, endothelial, and inducible.

Purpose:

To review the physiological and pathological roles of nitric oxide (NO).
To explore the mechanisms of NO formation, metabolism, and action.
To discuss the therapeutic potential and implications of NO modulation.

Summary:

NO's effects vary with pH and concentration, acting as a cell protector in small amounts and a toxin at millimolar levels.
It functions as a neurotransmitter in cell signaling, penile erection, and learning.
Endothelial NO causes vasodilation, while phagocytes use NO to combat microorganisms.

Impact:

NO dysregulation is implicated in chronic inflammation, immune responses, and tumor development.
Therapeutic applications include treating pulmonary hypertension, cerebral ischemia, and smooth muscle disorders.
Blocking NO-synthase may aid in managing septic shock, hypotension, and inflammation.

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