Cited by 190Urinary Tract Infections ManagementNitric Oxide and Endothelin EffectsUrinary Bladder and Prostate Research

Effects of pH, Nitrite, and Ascorbic Acid on Nonenzymatic Nitric Oxide Generation and Bacterial Growth in Urine

Carlsson, S., Wiklund, N.P., Engstrand, L., Weitzberg, E., Lundberg, J.O.N.·2001·Nitric Oxide

Abstract

Nitrite may be generated by bacteria in urine during urinary tract infections. Acidification of nitrite results in the formation of nitric oxide (NO) and other reactive nitrogen oxides, which are toxic to a variety of microorganisms. We have studied NO formation and bacterial growth in mildly acidified human urine containing nitrite and the reducing agent vitamin C. Urine collected from healthy subjects was incubated in closed syringes at different pH values with varying amounts of nitrite and/or ascorbic acid added. NO generation was measured in headspace gas using a chemiluminescence technique. A similar setup was also used to study the growth of three strains of bacteria in urine. Mildly acidified nitrite-containing urine generated large amounts of NO and this production was greatly potentiated by ascorbic acid. The growth of Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus saprophyticus was markedly reduced by the addition of nitrite to acidified urine. This inhibition was enhanced by ascorbic acid. In conclusion, we show that the growth of three common urinary pathogens is markedly inhibited in mildly acidified urine when nitrite is present. The bacteriostatic effect of acidified nitrite is likely related to the release of NO and other toxic reactive nitrogen intermediates. These results may help to explain the well-known beneficial effects of urinary acidification with, e.g., vitamin C in treatment and prevention of urinary tract infection.

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Crossref · 10.1006/niox.2001.0371

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  • Supplementation of drinking water with nitrite enhanced graft survival to more than 120 days compared with 50 days in control animals on a normal diet.

    “Supplementation of drinking water with nitrite enhanced graft survival to more than 120 days compared with 50 days in control animals on a normal diet.”
  • In animals on a low nitrate/nitrite diet, allograft survival was significantly reduced to 31 days.

    “In contrast, in animals on a low nitrate/nitrite diet, allograft survival was significantly reduced to 31 days.”
  • These differences were accompanied by amelioration of histopathologic changes in the allografts as well as decreased tissue messenger RNA concentrations of interferon-γ and tumor necrosis factor-α.

    “These differences were accompanied by amelioration of histopathologic changes in the allografts as well as in decreased tissue messenger RNA concentrations of interferon-␥ and tumor necrosis factor-␣.”

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Authors
Carlsson, S., Wiklund, N. P., Engstrand, L., Weitzberg, E., & Lundberg, J. O. N.
Affiliations
  • Karolinska University Hospital (SE)
  • Uppsala University Hospital (SE)
  • Karolinska Institutet (SE)
Corresponding author
Carlsson, S.
Venue
Nitric Oxide
Publisher
Elsevier BV
Published
2001-12
Volume
5
Issue
6
Pages
580-586
ISSN
1089-8603 (ISSN-L)
OpenAlex
W1974538071
Cited by
189
References
20
Citations by year
2026: 4 · 2025: 6 · 2024: 9 · 2023: 11 · 2022: 9 · 2021: 16 · 2020: 17 · 2019: 5 · 2018: 8 · 2017: 10 · 2016: 7 · 2015: 7 · 2014: 10 · 2013: 10 · 2012: 9
FWCI
2.41
Type
journal article
Language
en
Open access
closed
Locations
  • Nitric Oxide (publishedVersion)
  • PubMed (publishedVersion)
Funders
Vetenskapsrådet
Topics
  • Health Sciences › Medicine › Epidemiology › Urinary Tract Infections Management
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Urology › Urinary Bladder and Prostate Research
Keywords
nitrite, vitamin C, urine pH, urinary acidification, urinary tract infection, bacterial growth inhibition, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus saprophyticus, reactive nitrogen oxides, chemiluminescence
MeSH terms
Adult, Ascorbic Acid, Bacteriuria, Escherichia coli, Humans, Hydrogen-Ion Concentration, Middle Aged, Nitric Oxide, Nitrites, Pseudomonas aeruginosa, Staphylococcus

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