Cited by 219Redox biology and oxidative stressNitric Oxide and Endothelin EffectsNeutrophil, Myeloperoxidase and Oxidative Mechanisms

Nitroxidative, Nitrosative, and Nitrative Stress: Kinetic Predictions of Reactive Nitrogen Species Chemistry Under Biological Conditions

Lancaster, Jack R.·2006·Chemical Research in Toxicology

Abstract

A freely available Windows-based program, RNSim1A, is utilized to predict metal-independent reactive nitrogen species (RNS) chemistry (oxidation, nitrosation, and nitration) under simulated biological conditions and make the following specific predictions. (1) The peak in oxidative reactions that occurs in vitro with 1:1 fluxes of (*)NO and O(2)(*)(-) does not occur under biological conditions. (2) By far, the quantitatively dominant (92-99.6%) process in vivo is oxidation, compared to nitrosation and nitration. (3) Only five of the many possible RNS reactions involving thiol (glutathione, GSH) and tyrosine are quantitatively important biologically. (4) Under inflammatory conditions, approximately 1% of O(2)(*)(-) reacts with (*)NO to produce ONOO(-), with the remainder reacting with SOD. (5) The dominant reaction of tyrosyl radical is a radical swap with GSH, producing the glutathiyl radical and regenerating tyrosine. (6) Nitrosothiol is formed virtually exclusively via radical recombination (RS(*) + (*)NO) as opposed to reaction with nitrous anhydride (N(2)O(3)). (7) Nitrosothiol is an intermediate, not an endproduct, and responds dynamically to changes in the immediate chemical environment. (8) The formation of a nitroso group on a particular thiol can be considered a marker of increased reactivity of that thiol, and it is likely that other modifications of that thiol (oxidation, glutathiolation) are more abundant than nitrosation and may be the functionally significant modification. (9) Specific chemical mechanisms are proposed for posttranslational protein modification via nitrosation, nitration, glutathiolation, and also dithiol/disulfide exchange, with important roles for the thiolate anion and O(2) (suggesting possible mechanisms for O(2) sensing) and variable degrees of exposure of cysteine thiol and tyrosine phenolate. (10) Patterns of reactivity are similar for low (20 nM) and high (500 nM) steady-state levels of NO. (11) The dominant reactions are those involving reactants at the highest concentrations (CO(2), thiol, O(2)). Because of the dominance of oxidative processes caused by RNS, the term nitroxidative stress is proposed, emphasizing the oxidative (as opposed to nitrosative or nitrative) stress that dominates RNS actions under biological conditions.

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Crossref · 10.1021/tx060061w

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Authors
Lancaster, J. R.
Affiliations
University of Alabama (US)
Corresponding author
Lancaster, Jack R.
Venue
Chemical Research in Toxicology
Published
2006-08-18
Volume
19
Issue
9
Pages
1160-1174
ISSN
  • 0893-228X (ISSN-L)
  • 1520-5010
OpenAlex
W2084854699
Cited by
219
References
14
Citations by year
2026: 2 · 2025: 1 · 2024: 10 · 2023: 6 · 2022: 7 · 2021: 11 · 2020: 6 · 2019: 7 · 2018: 4 · 2017: 11 · 2016: 17 · 2015: 8 · 2014: 13 · 2013: 13 · 2012: 29
FWCI
6.62
Type
journal article
Language
en
Open access
closed
Locations
  • Chemical Research in Toxicology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL 074391, R01HL071189, HL 71189, R01HL074391)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 46935, R01DK046935)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
Keywords
reactive nitrogen species, nitro-oxidative stress, nitrosative stress, nitrative stress, nitric oxide, superoxide, peroxynitrite, glutathione, tyrosine, nitrosation, nitration, S-nitrosothiols, radical recombination, post-translational modification, oxygen sensing, thiolate anion
MeSH terms
Kinetics, Models, Theoretical, Oxidation-Reduction, Reactive Nitrogen Species

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