Cited by 570Nitric Oxide and Endothelin EffectsNeutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stress

Reduced Biopterin as a Cofactor in the Generation of Nitrogen Oxides by Murine Macrophages

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Kwon, N.S., Nathan, C.F., Stuehr, D.J.·1989·Journal of Biological Chemistry

Abstract

Generation of nitric oxide (NO.), an autacoid with vasorelaxant and cytotoxic properties, requires at least three cytosolic components in mouse macrophages besides L-arginine and NADPH. One or more components appear after induction by immunologic stimuli; two or more are present in both activated and non-activated macrophages. The constitutive factors can be separated on a Mr approximately 30,000 cut-off filter into high Mr fraction (HF) and low Mr fraction (LF) (Stuehr, D. J., Kwon, N. S., Gross, S. S., Thiel, B. A., Levi, R., and Nathan, C. F. (1989) Biochem. Biophys. Res. Commun. 161, 420-426). Herein we characterize the major active component in LF. The active component was dialyzable (Mr less than approximately 1,000), water soluble, and cationic at acidic to neutral pH. Fractionation on a C18 column in an acetonitrile/water gradient yielded one broad peak of activity, most of which corresponded to a fluorophore with the excitation/emission spectra of biopterins. Gas chromatography isolated a species in this peak with the mass spectrum of biopterin. Of 14 pteridines tested, only 7,8-dihydrobiopterin (H2biopterin) or 5,6,7,8-tetrahydrobiopterin (H4biopterin) could replace LF in synergizing with HF and the inducible component(s) to generate NO-2 and NO-3, the accumulating oxidation products of NO.. Half-maximal activity required 20-30 nM reduced biopterins. LFs from three cell lines were active in proportion to their content of biopterins; addition of reduced biopterins restored activity to LF from biopterin-deficient cells. Enhancement of NO-2 generation in the presence of H2biopterin but not H4biopterin was abolished by methotrexate and aminopterin, inhibitors of dihydrofolate reductase. These findings implicate a redox cycle in which the generation of NO. is facilitated by catalytic amounts of H4biopterin.

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Crossref · 10.1016/s0021-9258(19)47089-0

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Authors
Kwon, N. S., Nathan, C. F., & Stuehr, D. J.
Affiliations
Cornell University (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1989-12
Volume
264
Issue
34
Pages
20496-20501
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1533126574
Cited by
570
References
45
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 3 · 2022: 1 · 2021: 6 · 2020: 2 · 2019: 6 · 2018: 6 · 2017: 6 · 2016: 4 · 2015: 4 · 2014: 9 · 2013: 10 · 2012: 8
FWCI
30.73
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA-43610)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
nitric oxide, macrophages, 7,8-dihydrobiopterin, pteridines, dihydrofolate reductase inhibition, methotrexate, aminopterin, redox cycling, L-arginine
MeSH terms
Aminopterin, Animals, Biopterins, Cell Line, Cytosol, Kinetics, Macrophages, Gas Chromatography-Mass Spectrometry, Methotrexate, Nitrogen Oxides, Spectrometry, Fluorescence, Structure-Activity Relationship, Mice

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