Cited by 81Nitric Oxide and Endothelin EffectsEsophageal Cancer Research and TreatmentAntioxidant Activity and Oxidative Stress

Novel mechanism of nitrosative stress from dietary nitrate with relevance to gastro-oesophageal junction cancers

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Iijima, K.·2003·Carcinogenesis

Abstract

High luminal concentrations of nitric oxide are generated at the human gastro-oesophaegal junction and within Barrett's oesophagus due to the reduction of salivary nitrite to nitric oxide by acidic gastric juice. Salivary nitrite is derived from the entero-salivary recirculation of dietary nitrate. Our aim was to determine whether nitric oxide generated within the lumen will exert nitrosative stress on the adjacent epithelium. A benchtop model was constructed reproducing the nitrite chemistry occurring within the lumen of the upper gastrointestinal tract where saliva encounters acidic gastric juice. It incorporated an epithelial compartment maintained at pH 7.4 and separated from the lumen by a hydrophobic barrier with the properties of the epithelial lipid cell membrane. The secondary amine morpholine was used to measure N-nitroso compound formation in both the lumen and epithelial compartment. Adding 100 micro M nitrite to the acidic (pH 1.5) luminal compartment depleted of ascorbic acid generated 6.2 +/- 2.0 micro M (mean +/- SE) N-nitrosomorpholine in that compartment and 2.2 +/- 0.1 micro M nitrosomorpholine in the epithelial compartment at 30 min. When 100 micro M nitrite was added to the acidic luminal compartment containing physiological concentrations of ascorbic acid, all the nitrite was immediately converted to nitric oxide and no N-nitrosomorpholine was formed within that compartment. However, the nitric oxide rapidly diffused from the luminal compartment into the epithelial compartment and there generated very high concentrations of N-nitrosomorpholine (137 +/- 5.6 micro M at 30 min). The addition of ascorbic acid or glutathione to the epithelial compartment could only reduce nitric oxide-induced nitrosation within that compartment by 40%. The nitrate-derived nitric oxide generated within the lumen where saliva encounters gastric acid is likely to exert substantial nitrosative stress on the adjacent epithelium. This may contribute to the high prevalence of mutagenesis at this anatomical site.

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Crossref · 10.1093/carcin/bgg168

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  • In the stomach, swallowed nitrite is decomposed to form a variety of nitrogen compounds, including N-nitrosoamines.

    “In the stomach, swallowed nitrite is decomposed to form a variety of nitrogen compounds, including N-nitrosoamines [132].”

    From NO-Rich Diet for Lifestyle-Related Diseases (2015) · cites this paper as [132]

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  1. Leach,S. (1988) Mechanisms of endogenous N-nitrosation. In Hill,J. (ed.), Nitrosoamines: Toxicology and Microbiology. Ellis Horwood, Chichester, pp. 69±87.

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Authors
Iijima, K.
Affiliations
Tohoku University (JP)
Corresponding author
Iijima, K.
Venue
Carcinogenesis
Published
2003-08-29
Volume
24
Issue
12
Pages
1951-1960
ISSN
  • 0143-3334 (ISSN-L)
  • 1460-2180
OpenAlex
W2114793002
Cited by
81
References
64
Citations by year
2026: 1 · 2024: 1 · 2023: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 1 · 2016: 3 · 2015: 2 · 2014: 5 · 2013: 2 · 2012: 3
FWCI
3.26
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Carcinogenesis (publishedVersion, other-oa)
  • PubMed (publishedVersion)
  • ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (submittedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Surgery › Esophageal Cancer Research and Treatment
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
Keywords
nitrosative stress, dietary nitrate, nitric oxide, nitrite, esophagogastric junction, Barrett's esophagus, N-nitrosomorpholine, N-nitrosation, vitamin C, glutathione, gastric acid, mutagenesis
MeSH terms
Ascorbic Acid, Cell Membrane, Diet, Dose-Response Relationship, Drug, Epithelium, Esophageal Neoplasms, Glutathione, Humans, Hydrogen-Ion Concentration, Models, Biological, Morphine, Nitrates, Nitric Oxide, Nitrites, Nitrogen, Saliva, Stomach Neoplasms, Stress, Physiological, Time Factors, Mutagenesis

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