Cited by 58Inflammatory mediators and NSAID effectsEicosanoids and Hypertension PharmacologySynthesis and biological activity

Nitroarachidonic acid, a novel peroxidase inhibitor of prostaglandin endoperoxide H synthases 1 and 2

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Trostchansky, Andrés, Bonilla, Lucía, Thomas, Christopher P., O'Donnell, Valerie B., Marnett, Lawrence J., Radi, Rafael, Rubbo, Homero·2011·Journal of Biological Chemistry

Abstract

Prostaglandin endoperoxide H synthase (PGHS) catalyzes the oxidation of arachidonate to prostaglandin H(2). We have previously synthesized and chemically characterized nitroarachidonic acid (AANO(2)), a novel anti-inflammatory signaling mediator. Herein, the interaction of AANO(2) with PGHS was analyzed. AANO(2) inhibited oxygenase activity of PGHS-1 but not PGHS-2. AANO(2) exhibited time- and concentration-dependent inhibition of peroxidase activity in both PGHS-1 and -2. The plot of k(obs) versus AANO(2) concentrations showed a hyperbolic function with k(inact) = 0.045 s(-1) and K(i)(*app) = 0.019 μM for PGHS-1 and k(inact) = 0.057 s(-1) and K(i)(*app) = 0.020 μM for PGHS-2. Kinetic analysis suggests that inactivation of PGHS by AANO(2) involves two sequential steps: an initial reversible binding event (described by K(i)) followed by a practically irreversible event (K(i)(*app)) leading to an inactivated enzyme. Inactivation was associated with irreversible disruption of heme binding to the protein. The inhibitory effects of AANO(2) were selective because other nitro-fatty acids tested, such as nitrooleic acid and nitrolinoleic acid, were unable to inhibit enzyme activity. In activated human platelets, AANO(2) significantly decreased PGHS-1-dependent thromboxane B(2) formation in parallel with a decrease in platelet aggregation, thus confirming the biological relevance of this novel inhibitory pathway.

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  • Nitroalkylation directly inhibits the catalytic activity of enzymes including xanthine oxidoreductase, cyclooxygenase and soluble epoxide hydrolase, reactions that result in significant beneficial physiological responses.

    “Nitroalkylation also directly inhibits the catalytic activity of enzymes including xanthine oxidoreductase [33], cyclooxygenase [37] and soluble epoxide hydrolase (Cys521) [34], reactions that result in significant beneficial physiological responses.”
  • Electrophilic nitroalkenes exert signaling actions via the modulation of the expression and activity of both anti-inflammatory and pro-inflammatory enzymes.

    “Electrophilic nitroalkenes exert signaling actions via the modulation of the expression and activity of both anti-inflammatory [32] and pro-inflammatory enzymes [23].”

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Research works printed but not linked: 3

  1. [24]O'Donnell V. B. Coles B. Lewis M. J. Crews B. C. Marnett L. J. Freeman B. A. (2000) J. Biol. Chem. 275, 38239– 38244 10993875
  2. [26]Copeland R. A. (2000) Enzymes, 2nd Ed., pp. 305– 317, John Wiley & Sons, Inc., New York
  3. [42]Agwu D. E. Holub B. J. Johnstone I. B. Crane S. (1983) Can. J. Comp. Med. 47, 203– 206 6883186 PMC1235918

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Authors
Trostchansky, A., Bonilla, L., Thomas, C. P., O'Donnell, V. B., Marnett, L. J., Radi, R., & Rubbo, H.
Affiliations
  • Universidad de la República de Uruguay (UY)
  • Cardiff University (GB)
  • Vanderbilt University (US)
Corresponding author
Rubbo, Homero
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2011-04
Volume
286
Issue
15
Pages
12891-12900
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2039023342
Cited by
58
References
45
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 4 · 2022: 1 · 2021: 2 · 2020: 5 · 2019: 8 · 2018: 6 · 2017: 3 · 2016: 6 · 2015: 4 · 2014: 1 · 2013: 7 · 2012: 2
FWCI
2.34
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • Wellcome Trust
  • National Institute of General Medical Sciences (GM 15431, P50GM015431, P01GM015431)
Topics
  • Health Sciences › Medicine › Pharmacology › Inflammatory mediators and NSAID effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Eicosanoids and Hypertension Pharmacology
  • Physical Sciences › Chemistry › Organic Chemistry › Synthesis and biological activity
Keywords
PGHS-1, prostaglandin H synthase-2, peroxidase inhibition, enzyme inactivation, heme binding, nitro-fatty acids, thromboxane B2, platelet aggregation, anti-inflammatory signaling
MeSH terms
Arachidonic Acids, Blood Platelets, Dose-Response Relationship, Drug, Kinetics, Peroxidase, Platelet Aggregation, Protein Binding, Thromboxane B2, Cyclooxygenase 1, Cyclooxygenase 2, Cyclooxygenase 2 Inhibitors

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