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Apocynin inhibits peroxynitrite formation by murine macrophages

Open access
Muijsers, R B R, Van Den Worm, E, Folkerts, G, Beukelman, C J, Koster, A S, Postma, D S, Nijkamp, F P·2000·British Journal of Pharmacology

Abstract

Peroxynitrite (ONOO−) the highly reactive coupling product of nitric oxide and superoxide, has been implicated in the pathogenesis of an increasing number of (inflammatory) diseases. At present, however, selective peroxynitrite antagonizing agents with therapeutic potential are not available. Therefore, the NADPH‐oxidase inhibitor apocynin (4‐hydroxy‐3‐methoxy‐acetophenone) was tested for its ability to inhibit peroxynitrite formation in vitro The murine macrophage cell‐line J774A.1, stimulated with IFNγ/LPS, was used as a model. Conversion of 123‐dihydrorhodamine (123‐DHR) to its oxidation product 123‐rhodamine was used to measure peroxynitrite production. Stimulated peroxynitrite formation could be completely inhibited by apocynin, by the superoxide scavenger TEMPO as well as by the nitric oxide synthase inhibitor aminoguanidine. Apocynin and aminoguanidine specifically inhibited superoxide and nitric oxide formation respectively as confirmed by measuring lucigenin enhanced chemiluminescence and nitrite accumulation. It is concluded that J774A.1 macrophages produce significant amounts of peroxynitrite, which is associated with nitric oxide production and NADPH‐oxidase dependent superoxide formation. The NADPH‐oxidase inhibitor apocynin proved to be a potent inhibitor of both superoxide and peroxynitrite formation by macrophages, which may be of future therapeutic significance in a wide range of inflammatory disorders. British Journal of Pharmacology (2000) 130, 932–936; doi:10.1038/sj.bjp.0703401

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Metadata

Authors
Muijsers, R. B. R., Van Den Worm, E., Folkerts, G., Beukelman, C. J., Koster, A. S., Postma, D. S., & Nijkamp, F. P.
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
2000-06
Volume
130
Issue
4
Pages
932-936
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W2003554652
Cited by
160
References
3
FWCI
1.80
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Apocynin inhibits peroxynitrite formation by murine macrophages. https://app.cochat.ai/papers/10.1038/sj.bjp.0703401
The paper
Muijsers, R. B. R., Van Den Worm, E., Folkerts, G., Beukelman, C. J., Koster, A. S., Postma, D. S., & Nijkamp, F. P. (2000). Apocynin inhibits peroxynitrite formation by murine macrophages. British Journal of Pharmacology. https://doi.org/10.1038/sj.bjp.0703401

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