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Endothelial Nitric Oxide Synthase in Vascular Disease: From Marvel to Menace
Abstract
Nitric oxide (NO·) is an important protective molecule in the vasculature, and endothelial NO· synthase (eNOS) is responsible for most of the vascular NO· produced. A functional eNOS oxidizes its substrate l -arginine to l -citrulline and NO·. This normal function of eNOS requires dimerization of the enzyme, the presence of the substrate l -arginine, and the essential cofactor (6 R )-5,6,7,8-tetrahydro- l -biopterin (BH 4 ), one of the most potent naturally occurring reducing agents. Cardiovascular risk factors such as hypertension, hypercholesterolemia, diabetes mellitus, or chronic smoking stimulate the production of reactive oxygen species in the vascular wall. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases represent major sources of this reactive oxygen species and have been found upregulated and activated in animal models of hypertension, diabetes, and sedentary lifestyle and in patients with cardiovascular risk factors. Superoxide (O 2 · − ) reacts avidly with vascular NO· to form peroxynitrite (ONOO − ). The cofactor BH 4 is highly sensitive to oxidation by ONOO − . Diminished levels of BH 4 promote O 2 · − production by eNOS (referred to as eNOS uncoupling). This transformation of eNOS from a protective enzyme to a contributor to oxidative stress has been observed in several in vitro models, in animal models of cardiovascular diseases, and in patients with cardiovascular risk factors. In many cases, supplementation with BH 4 has been shown to correct eNOS dysfunction in animal models and patients. In addition, folic acid and infusions of vitamin C are able to restore eNOS functionality, most probably by enhancing BH 4 levels as well.
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In the citing paper
“The uncoupling causes eNOS activity to change from healthy (producing NO) to toxic (generating superoxide) (303).”
From Sources of Vascular Nitric Oxide and Reactive Oxygen Species and Their Regulation (2019) · cites this paper as [303]
In the citing paper
“Similarly, vascular disease, cardiovascular disease (CVD), and metabolic syndrome all share effective loss of NO function[23,35–39].”
From Enterosalivary nitrate metabolism and the microbiome: Intersection of microbial metabolism, nitric oxide and diet in cardiac and pulmonary vascular health (2017) · cites this paper as [23]
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- 10.1161/res.86.3.347 · DOI
- Li H Witte K August M Brausch I Gödtel-Armbrust U Habermeier A Closs EI Oelze M Münzel T Förstermann U. Reversal of eNOS uncoupling and upregulation of eNOS expression lowers blood pressure in hypertensive rats. J Am Coll Cardiol. In press.
- 10.1161/res.88.2.e14 · DOI
- 10.1161/circ.99.15.2027 · DOI
- 10.1161/res.86.5.494 · DOI
- 10.1161/circ.94.11.2756 · DOI
- 10.1161/circ.101.11.1261 · DOI
- 10.1161/circ.100.21.2131 · DOI
- 10.1161/hyp.30.1.57 · DOI
- 10.1161/res.77.3.510 · DOI
- 10.1161/circ.103.9.1282 · DOI
- 10.1161/hyp.33.6.1353 · DOI
- 10.1161/res.86.1.e7 · DOI
- 10.1161/res.86.2.e36 · DOI
- 10.1161/circ.104.10.1119 · DOI
- 10.1161/res.87.2.99 · DOI
- 10.1161/res.87.7.566 · DOI
- 10.1161/hyp.38.5.1044 · DOI
- 10.1161/circ.104.22.2673 · DOI
- 10.1161/circ.94.1.6 · DOI
- 10.1161/circ.97.3.237 · DOI
- 10.1161/atvb.22.1.6 · DOI
- 10.1161/atvb.20.1.185 · DOI
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Metadata
- Authors
- Förstermann, U., & Münzel, T.
- Affiliations
- From the Departments of Pharmacology (U.F.) and Internal Medicine II (Cardiology) (T.M.), Johannes Gutenberg University Hospitals, Mainz, Germany.
- Venue
- Circulation
- Published
- 2006-04-04
- Volume
- 113
- Issue
- 13
- Pages
- 1708-1714
- ISSN
- 0009-7322 (ISSN-L)
- 1524-4539
- OpenAlex
- W2146190354
- Cited by
- 1,957
- References
- 67
- Citations by year
- 2026: 93 · 2025: 76 · 2024: 99 · 2023: 86 · 2022: 110 · 2021: 113 · 2020: 110 · 2019: 89 · 2018: 105 · 2017: 105 · 2016: 117 · 2015: 101 · 2014: 123 · 2013: 98 · 2012: 85
- FWCI
- 62.52
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Circulation (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology (medical) › Nitric Oxide and Endothelin Effects
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Health and Disease Prevention
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Eicosanoids and Hypertension Pharmacology
- Keywords
- endothelial nitric oxide synthase, nitric oxide, tetrahydrobiopterin, eNOS uncoupling, NADPH oxidase, reactive oxygen species, superoxide, peroxynitrite, oxidative stress, cardiovascular risk factors, hypertension, hypercholesterolemia, diabetes mellitus, smoking, folic acid, vitamin C, L-arginine
- MeSH terms
- Animals, Endothelium, Vascular, Humans, Nitric Oxide, Vascular Diseases, Reactive Oxygen Species, Oxidative Stress, Nitric Oxide Synthase Type III
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