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Nitrite in Human Saliva. Its Possible Relationship to Nitrosamine Formation23
Abstract
Nitrite was consistently found in human saliva at levels of usually 6-10 ppm. The nitrite level did not seem to be strongly influenced by the composition of a meal, and in some individuals a narrow range of nitrite concentration was maintained for a long time. In agreement with earlier work, parotid ductal saliva was found to be free of nitrite, and a major route of nitrite formation was via microbial reduction of nitrate naturally present in saliva. Exploration of various parameters related to the reduction of nitrate to nitrite did not demonstrate a clear correlation between measurements on individuals and their level of salivary nitrite. The microorganisms responsible for nitrite formation were identified and quantified, and the relationships between nitrate consumption and nitrite formation explored. These complex relationships suggested that the tree nitrite in saliva represents the “spillover” of that formed in microbial cells.
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“Earlier studies reported the half-life of NO2- in blood to be approximately 110 seconds; however, it is now clear that the half life of exogenously administered nitrite can range between 20–30 minutes thus making it a readily available buffering metabolite to maintain NO bioavailability [52, 68, 69].”
From Inorganic nitrite therapy: historical perspective and future directions (2011) · cites this paper as [52]
In the citing paper
“As such, nitrate dependent nitrite production is predominantly generated from the enterosalivary circulatory system delivery of nitrate to the oral cavity where it is reduced by commensal bacteria nitrate reductase activity present in the digestive system (Figure 2) [49–53].”
From Inorganic nitrite therapy: historical perspective and future directions (2011) · cites this paper as [52]
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Stuehr, D. J., & Marletta, M. A. (1985) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.82.22.7738 · Cited by 1,126
Nitric oxide signaling in health and disease
Lundberg, J. O., & Weitzberg, E. (2022) · Cell · doi:10.1016/j.cell.2022.06.010 · Cited by 879
Formation of N-nitroso compounds: Chemistry, kinetics, and in vivo occurrence
Mirvish, S. S. (1975) · Toxicology and Applied Pharmacology · doi:10.1016/0041-008x(75)90255-0 · Cited by 779
Nitrate, bacteria and human health
Lundberg, J. O., Weitzberg, E., Cole, J. A., & Benjamin, N. (2004) · Nature Reviews Microbiology · doi:10.1038/nrmicro929 · Cited by 739
Duncan, C., Dougall, H., Johnston, P., Green, S., Brogan, R., Leifert, C., Smith, L., Golden, M., & Benjamin, N. (1995) · Nature Medicine · doi:10.1038/nm0695-546 · Cited by 734
Metadata
- Authors
- Tannenbaum, S. R., Sinskey, A. J., Weisman, M., & Bishop, W.
- Affiliations
- Massachusetts Institute of Technology (US)
- Venue
- JNCI Journal of the National Cancer Institute
- Publisher
- Oxford University Press (OUP)
- Published
- 1974-07
- Volume
- 53
- Issue
- 1
- Pages
- 75-784
- ISSN
- 0027-8874 (ISSN-L)
- 1460-2105
- OpenAlex
- W2319869190
- Cited by
- 237
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 4 · 2021: 5 · 2020: 6 · 2019: 3 · 2018: 6 · 2017: 10 · 2016: 1 · 2015: 2 · 2014: 3 · 2013: 4 · 2012: 2
- FWCI
- 17.72
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- JNCI Journal of the National Cancer Institute (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Dentistry › Periodontics › Oral microbiology and periodontitis research
- Health Sciences › Dentistry › General Dentistry › Oral Health Pathology and Treatment
- Health Sciences › Medicine › Physiology (medical) › Salivary Gland Disorders and Functions
- Keywords
- salivary nitrite, nitrosamine formation, nitrate reduction, salivary microorganisms, parotid saliva, dietary nitrate intake
- MeSH terms
- Corynebacterium, Diet, Fusobacterium, Humans, Lactates, Nitrates, Nitrites, Nitrosamines, Nocardia, Oxidation-Reduction, Parotid Gland, Pyruvates, Saliva, Staphylococcus, Veillonella
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