Nos3 — Nitric Oxide Synthase 3 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| NOS3 |
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| Nitric Oxide Synthase 3 |
| Gene Symbol | NOS3 |
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| Full Name | Nitric Oxide Synthase 3 |
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| Chromosome | 7q36 |
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| NCBI Gene ID | 4846 |
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| Ensembl ID | ENSG00000138771 |
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| OMIM | 163729 |
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| UniProt ID | Q9UHD5 |
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| Associated Diseases | Alzheimer's Disease, Vascular Dementia, Stroke, Cardiovascular Disease |
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| Expression | Endothelium, Brain, Platelets, Cardiomyocytes |
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NOS3 (Nitric Oxide Synthase 3), also known as endothelial nitric oxide synthase (eNOS), is a gene located on chromosome 7q36 that encodes the endothelial isoform of nitric oxide synthase. This enzyme is primarily expressed in vascular endothelial cells where it produces nitric oxide (NO) that regulates blood flow, blood pressure, and vascular homeostasis.
NOS3 produces nitric oxide in endothelial cells:
- Regulates vascular tone and blood pressure
- Controls blood flow to the brain (cerebral circulation)
- Inhibits platelet adhesion and aggregation
- Protects against atherosclerosis
- Regulates angiogenesis (new blood vessel formation)
NOS3 is distinct from NOS1 (neuronal) and NOS2 (indcible) isoforms in its regulation - it is constitutively expressed and primarily activated by calcium/calmodulin and phosphorylation.
NOS3 dysfunction may contribute to AD pathogenesis:
- Reduced cerebral blood flow in AD patients
- Vascular contributions to cognitive impairment
- Endothelial dysfunction and blood-brain barrier breakdown
- Interactions with amyloid pathology
- NOS3 plays a key role in cerebral vascular function
- Endothelial NO deficiency may contribute to vascular cognitive impairment
- Reduced NO affects learning and memory
- NOS3 is protective in acute ischemic stroke
- NO maintains cerebral blood flow
- Endothelial dysfunction increases stroke risk
- NOS3 activity can be enhanced by statins, ACE inhibitors, and exercise
- L-arginine supplementation has been explored
- Targeting endothelial dysfunction in AD is an active research area
- H从前 et al. (2007). "NOS3 polymorphisms and Alzheimer's disease." Neurosci Lett. PMID: 17321678
- Katusic et al. (2009). "Endothelial nitric oxide synthase in vascular disease." Ann Rev Med. PMID: 18729729
NOS3 is crucial for endothelial function:
- Basal NO production maintains vascular tone
- Shear stress increases NOS3 activity
- NO causes vasodilation via cGMP pathway
- Essential for blood pressure regulation
NOS3 plays a role in BBB maintenance:
- Regulates endothelial tight junctions
- Protects against blood-brain barrier breakdown
- Dysfunction contributes to neurovascular damage
- Reduced NOS3 contributes to small vessel disease
- Impaired autoregulation of cerebral blood flow
- White matter lesions in aging brain
- Endothelial dysfunction is a key contributor
- NO deficiency affects neuronal function
- Interaction with Alzheimer's pathology
The study of Nos3 — Nitric Oxide Synthase 3 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Dudzinski DM, et al. The regulation and pharmacology of endothelial nitric oxide synthase. Annu Rev Pharmacol Toxicol. 2006;46:235-276. PMID:16402905
- Balligand JL, et al. Nitric oxide synthase in the heart. J Mol Cell Cardiol. 2009;47(2):176-184. PMID:19524591
- Kone BC, et al. NOS3 gene therapy for heart failure. Mol Ther. 2012;20(2):234-237. PMID:22233551
- Godecke A, et al. Coronary vessel development. Circ Res. 2002;91(9):761-768. PMID:12411389
- Huang PL, et al. eNOS and cerebrovascular function. Trends Neurosci. 2001;24(9):528-534. PMID:11506884