Cited by 126Nitric Oxide and Endothelin EffectsPharmacogenetics and Drug MetabolismRedox biology and oxidative stress

Characterization of the magnitude and mechanism of aldehyde oxidase-mediated nitric oxide production from nitrite

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Li, Haitao, Kundu, Tapan Kumar, Zweier, Jay L.·2009·Journal of Biological Chemistry

Abstract

Aldehyde oxidase (AO) is a cytosolic enzyme with an important role in drug and xenobiotic metabolism. Although AO has structural similarity to bacterial nitrite reductases, it is unknown whether AO-catalyzed nitrite reduction can be an important source of NO. The mechanism, magnitude, and quantitative importance of AO-mediated nitrite reduction in tissues have not been reported. To investigate this pathway and its quantitative importance, EPR spectroscopy, chemiluminescence NO analyzer, and immunoassays of cGMP formation were performed. The kinetics and magnitude of AO-dependent NO formation were characterized. In the presence of typical aldehyde substrates or NADH, AO reduced nitrite to NO. Kinetics of AO-catalyzed nitrite reduction followed Michaelis-Menten kinetics under anaerobic conditions. Under physiological conditions, nitrite levels are far below its measured K(m) value in the presence of either the flavin site electron donor NADH or molybdenum site aldehyde electron donors. Under aerobic conditions with the FAD site-binding substrate, NADH, AO-mediated NO production was largely maintained, although with aldehyde substrates oxygen-dependent inhibition was seen. Oxygen tension, substrate, and pH levels were important regulators of AO-catalyzed NO generation. From kinetic data, it was determined that during ischemia hepatic, pulmonary, or myocardial AO and nitrite levels were sufficient to result in NO generation comparable to or exceeding maximal production by constitutive NO synthases. Thus, AO-catalyzed nitrite reduction can be an important source of NO generation, and its NO production will be further increased by therapeutic administration of nitrite.

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Crossref · 10.1074/jbc.m109.019125

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  • The mechanism of nitrite reduction by AO is similar to that of XOR where nitrite is reduced at the molybdenum site and either an aldehyde can supply electrons at that same site, or NADH can supply electrons from the flavin site.

    “The mechanism of nitrite reduction by AO is similar to that of XOR where nitrite is reduced at the molybdenum site and either an aldehyde can supply electrons at that same site, or NADH can supply electrons from the flavin site [93].”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [93]

  • The low Km of AO for nitrite (about 3 mM) limits its NO production rate, but it has been estimated that AO mediated NO production from nitrite can reach 1.5 nM/s at low pH in the heart.

    “Again, the low Km of AO for nitrite (about 3 mM) limits its NO production rate, but it has been estimated that AO mediated NO production from nitrite can reach 1.5 nM/s at low pH in the heart [93].”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [93]

  • Since AO has a higher affinity for NADH than XOR, it is more likely to contribute to aerobic nitrite reduction than XOR with physiological levels of NADH.

    “Since AO has a higher affinity for NADH than XOR, it is more likely to contribute to aerobic nitrite reduction than XOR with physiological levels of NADH [93].”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [93]

  • Under aerobic conditions, the NADH-dependent process of AO is favored as oxygen acts as a competitive inhibitor of nitrite reduction in the absence of NADH.

    “Under aerobic conditions, the NADH-dependent process is favored as oxygen acts as a competitive inhibitor of nitrite reduction in the absence of NADH [93].”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [93]

  • Lowering pH increases the rate of AO-mediated reduction, but not as much as other pathways; about 35% in going from pH 7.4 to pH 6.0.

    “Like other nitrite reduction pathways, lowering pH increases the rate of AO-mediated reduction, but not as much as other pathways; about 35% in going from pH 7.4 to pH 6.0 [93].”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [93]

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Authors
Li, H., Kundu, T. K., & Zweier, J. L.
Affiliations
The Ohio State University (US)
Corresponding author
  • Li, Haitao
  • Zweier, Jay L.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-12
Volume
284
Issue
49
Pages
33850-33858
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2056934771
Cited by
126
References
49
Citations by year
2026: 2 · 2025: 6 · 2024: 3 · 2023: 1 · 2022: 4 · 2021: 3 · 2020: 6 · 2019: 8 · 2018: 13 · 2017: 9 · 2016: 7 · 2015: 13 · 2014: 15 · 2013: 12 · 2012: 9
FWCI
5.08
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL-38324, R01HL063744, HL 65608, P01HL065608, HL 63744, R01HL038324)
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
aldehyde oxidase, nitric oxide production, nitrite reduction, nitrite, enzyme kinetics, Michaelis-Menten kinetics, NADH, oxygen inhibition, cyclic GMP, ischemia, nitrite therapy, nitrite reductase
MeSH terms
Animals, Electron Spin Resonance Spectroscopy, Flavins, Hydrogen-Ion Concentration, Immunoassay, Kinetics, Liver, Male, Molybdenum, Nitric Oxide, Nitrites, Xenobiotics, Rats, Sprague-Dawley, Aldehyde Oxidase, Rats

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