Cited by 686Neutrophil, Myeloperoxidase and Oxidative MechanismsNitric Oxide and Endothelin EffectsRedox biology and oxidative stress

Nitric oxide, an endothelial cell relaxation factor, inhibits neutrophil superoxide anion production via a direct action on the NADPH oxidase.

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Clancy, R M, Leszczynska-Piziak, J, Abramson, S B·1992·Journal of Clinical Investigation

Abstract

Nitric oxide provokes vasodilation and inhibits platelet aggregation. We examined the effect of nitric oxide on superoxide anion production by three sources: activated intact neutrophils, xanthine oxidase/hypoxanthine, and the NADPH oxidase. Nitric oxide significantly inhibited the generation of superoxide anion by neutrophils exposed to either FMLP (10(-7)M) or PMA (150 ng/ml) (IC50 = 30 microM). To determine whether the effect of nitric oxide on the respiratory burst was due to simple scavenging of O2+, kinetic studies that compared effects on neutrophils and the cell-free xanthine oxidase system were performed. Nitric oxide inhibited O2+ produced by xanthine oxidase only when added simultaneously with substrate, consistent with the short half-life of NO in oxygenated solution. In contrast, the addition of nitric oxide to neutrophils 20 min before FMLP resulted in the inhibition of O2+ production, which suggests formation of a stable intermediate. The effect of nitric oxide on the cell-free NADPH oxidase superoxide-generating system was also examined: The addition of NO before arachidonate activation (t = -6 min) significantly inhibited superoxide anion production. Nitric oxide did not inhibit O2+ when added at NADPH initiation (t = 0). Treatment of the membrane but not cytosolic component of the oxidase was sufficient to inhibit O2+ generation. The data suggest that nitric oxide inhibits neutrophil O2+ production via direct effects on membrane components of the NADPH oxidase. This action must occur before the assembly of the activated complex.

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  • NO, through its high affinity for heme groups or via S-nitrosation, can act as an important modulator of NOX or can modulate the insertion of heme in the receptor sGC.

    “In another example, NO, through its high affinity for heme groups or via S-nitrosation, can act as an important modulator of NOX (176, 315, 846) or can also modulate the insertion of heme in the receptor sGC.”

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Authors
Clancy, R. M., Leszczynska-Piziak, J., & Abramson, S. B.
Affiliations
NYU Langone Health (US)
Venue
Journal of Clinical Investigation
Published
1992-09-01
Volume
90
Issue
3
Pages
1116-1121
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2139533485
Cited by
686
References
54
Citations by year
2026: 1 · 2025: 5 · 2024: 5 · 2023: 6 · 2022: 1 · 2021: 3 · 2020: 5 · 2019: 8 · 2018: 6 · 2017: 9 · 2016: 6 · 2015: 11 · 2014: 10 · 2013: 5 · 2012: 9
FWCI
13.70
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
nitric oxide, neutrophils, superoxide production, NADPH oxidase, respiratory burst, fMLP, PMA, arachidonic acid, oxygen radical scavenging
MeSH terms
Calcium, Cells, Cultured, Humans, NADH, NADPH Oxidoreductases, Neutrophils, Nitric Oxide, Superoxides, Xanthine Oxidase, Cell Degranulation, NADPH Oxidases

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