Cited by 70Nitric Oxide and Endothelin EffectsPharmacogenetics and Drug MetabolismRedox biology and oxidative stress

Various intracellular compartments cooperate in the release of nitric oxide from glycerol trinitrate in liver

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Kozlov, Andrey V, Dietrich, Barbara, Nohl, Hans·2003·British Journal of Pharmacology

Abstract

1. Glycerol trinitrate (GTN) has been used in therapy for more than 100 years. Biological effects of GTN are due to the release of the biomediator nitric oxide (NO). However, the mechanism by which GTN provides NO, in particular in liver, is still unknown. In this study, we provide experimental evidence showing that cytoplasm, endoplasmic reticulum, and mitochondria are required for the release of NO from GTN in the liver. 2. NO and nitrite (NO(2)(-)) were determined using low-temperature electron paramagnetic resonance and the Griess reaction, respectively. 3. The first step of GTN biotransformation is the release of NO(2)(-). This step is performed in cytoplasm and catalyzed by glutathione-S-transferase. The second step is the rate-limiting step where NO(2)(-) is slowly reduced to NO. This is mainly catalyzed by cytochrome P-450. The second phase can be significantly enhanced by decreasing the pH value, a situation which occurs during ischemia. At high NADPH concentrations exceeding physiological values, cytochrome P-450 catalyzes GTN biotransformation without the involvement of cytoplasmic glutathione-S-transferase. 4. In conclusion, our data show that NO(2)(-) derived from the first step of biotransformation of GTN in the liver is the precursor of NO but not a product of NO degradation; consequently, NO(2)(-) levels are not likely to be a marker of NO release from GTN as earlier suggested.

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Crossref · 10.1038/sj.bjp.0705323

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  • Dietary NO3− supplementation elevates nitric oxide bioavailability via reduction of exogenous NO3− to nitrite by commensal anaerobic bacteria in the oral cavity, followed by one-electron reduction of NO2− to NO catalyzed by various NO2− reductases in tissue and blood.

    “Dietary NO3− supplementation has been observed to elevate nitric oxide (NO) bioavailability via the reduction of exogenous NO3− to nitrite (NO2−) by commensal anaerobic bacteria in the oral cavity [79], followed by the one-electron reduction of NO2− to NO (and other nitrogen intermediates) catalyzed by various NO2− reductases [80,81,82,83,84] in the tissue and blood.”

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Authors
Kozlov, A. V., Dietrich, B., & Nohl, H.
Affiliations
University of Veterinary Medicine Vienna (AT)
Corresponding author
Kozlov, Andrey V
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
2003-07
Volume
139
Issue
5
Pages
989-997
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W2080721489
Cited by
69
References
43
Citations by year
2024: 2 · 2021: 1 · 2020: 1 · 2018: 1 · 2017: 6 · 2015: 3 · 2014: 3 · 2013: 7 · 2012: 6
FWCI
2.87
Type
journal article
Language
en
Open access
Locations
  • British Journal of Pharmacology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Austrian Science Fund
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
glycerol trinitrate, nitric oxide release, liver, nitrite, nitrate, glutathione S-transferase, cytochrome P450, NADPH, intracellular compartments, endoplasmic reticulum, mitochondria, cytoplasm, drug metabolism, ischemia, pH
MeSH terms
Animals, Dose-Response Relationship, Drug, Endoplasmic Reticulum, Nitroglycerin, Intracellular Fluid, Liver, Male, Mitochondria, Nitric Oxide, Nitrites, Rats, Sprague-Dawley, Rats

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