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Related Experiment Videos

Nitric oxide activates cyclooxygenase enzymes

D Salvemini1, T P Misko, J L Masferrer

  • 1Department of Molecular Pharmacology, Monsanto Company, St. Louis, MO 63167.

Proceedings of the National Academy of Sciences of the United States of America
|August 1, 1993
PubMed
Summary

Nitric oxide (NO) enhances cyclooxygenase (COX) activity, increasing prostaglandin E2 (PGE2) production. This NO-mediated COX activation, independent of cGMP, may worsen inflammatory responses by boosting pro-inflammatory prostaglandins.

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Area of Science:

  • Biochemistry
  • Immunology
  • Pharmacology

Background:

  • Nitric oxide (NO) and cyclooxygenase (COX) enzymes play critical roles in inflammatory processes.
  • The interaction between NO and COX, particularly COX-2, is complex and not fully understood.
  • Understanding this interaction is crucial for developing targeted anti-inflammatory therapies.

Purpose of the Study:

  • To investigate the role of nitric oxide (NO) in modulating the activity of constitutive (COX-1) and induced (COX-2) cyclooxygenase.
  • To determine the mechanism by which NO influences prostaglandin E2 (PGE2) production.
  • To explore the implications of NO-mediated COX activation in inflammatory conditions.

Main Methods:

  • Utilized the mouse macrophage cell line RAW264.7 stimulated with lipopolysaccharide (LPS) to induce both NO synthase (NOS) and COX-2.

Related Experiment Videos

  • Employed NOS inhibitors (NG-monomethyl-L-arginine, aminoguanidine) and L-arginine supplementation to manipulate NO production.
  • Used human fetal fibroblasts stimulated with interleukin-1 beta (IL-1β) to study COX activity in the absence of endogenous NOS.
  • Administered exogenous NO donors (sodium nitroprusside, glyceryl trinitrate) and measured PGE2 production.
  • Investigated the role of cGMP by using hemoglobin and methylene blue.

    • Main Results:

    • LPS induction of RAW264.7 cells increased nitrite (NO2-) and PGE2 release, which was blocked by NOS inhibitors.
    • Reduced NO generation in L-arginine-free medium significantly decreased both NO2- and PGE2 accumulation.
    • Exogenous NO donors (sodium nitroprusside, glyceryl trinitrate) increased COX activity in IL-1β-stimulated fibroblasts by 5-fold.
    • NO-mediated COX activation was independent of cGMP, as hemoglobin abolished the effect but methylene blue did not.
    • Sodium nitroprusside enhanced arachidonic acid-stimulated PGE2 production by both recombinant COX-1 and COX-2.

    Conclusions:

    • Nitric oxide (NO) directly enhances cyclooxygenase (COX) activity, leading to increased prostaglandin E2 (PGE2) production.
    • This NO-mediated enhancement of COX activity occurs through a mechanism independent of cyclic guanosine monophosphate (cGMP).
    • The findings suggest that NO can exacerbate inflammatory responses by increasing the production of pro-inflammatory prostaglandins, particularly when both NOS and COX systems are active.