Why in News?
- Nicox announced positive FDA feedback on pre-NDA meeting for NCX 470, a nitric oxide-releasing eye drop that reduced intraocular pressure by up to 10 mmHg in Phase 3 trials for open-angle glaucoma and ocular hypertension; NDA submission is on track for summer 2026.
Key Scientific & Biological Information
- Natural Molecule: Nitric oxide is a colourless, gaseous free radical produced naturally in the human body's blood vessel lining (endothelium) from the amino acid L-arginine.
- Vasodilation: Its primary role is to signal smooth muscles to relax, causing blood vessels to widen. This process, called vasodilation, is essential for healthy blood pressure and nutrient delivery.
- Triple Threat (Immune Function): NO possesses strong antibacterial, antifungal, and antiviral properties by damaging the DNA of pathogens and inhibiting their replication.
- "Molecule of the Year": Recognized for its monumental impact, it was named "Molecule of the Year" by science in 1992, and its discovery earned the 1998 Nobel Prize in Physiology or Medicine.
- Neurotransmission: In the brain, it acts as a retrograde messenger, helping to tune signals between nerve cells, which is vital for memory and learning.
Clinical & Industrial Applications
- Approved Use: Inhaled nitric oxide (iNO) is currently FDA-approved for treating persistent pulmonary hypertension in newborns.
- Drug Mechanisms: Popular medications like Sildenafil (Viagra) work by enhancing the chemical signals downstream of the nitric oxide pathway to promote blood flow.
- Industrial Impact: NO is a major intermediate in the chemical industry (e.g., producing nitric acid) but is also a serious air pollutant when generated by vehicle engines and power plants.
- Atmospheric Role: It is related to, but distinct from, Nitrous Oxide (N2O), a potent greenhouse gas and anesthetic.
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