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Related Experiment Videos

Ibuprofen: effect on inducible nitric oxide synthase

N C Stratman1, D B Carter, V H Sethy

  • 1CNS Diseases Research, Pharmacia and Upjohn Inc., Kalamazoo, MI 49001, USA.

Brain Research. Molecular Brain Research
|December 24, 1997
PubMed
Summary

Ibuprofen reduces Alzheimer's disease progression by decreasing inducible nitric oxide synthase (iNOS) protein levels, not mRNA. This suggests a post-transcriptional mechanism that may protect neurons.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Inflammation Research

Background:

  • Non-steroidal anti-inflammatory drugs (NSAIDs), including ibuprofen, show potential in decreasing Alzheimer's disease incidence and progression.
  • NSAIDs inhibit cyclooxygenase (COX) and have recently been shown to decrease inducible nitric oxide synthase (iNOS) activity.
  • Understanding the precise mechanism of NSAID action is crucial for developing safer Alzheimer's disease therapeutics.

Purpose of the Study:

  • To investigate the mechanism by which ibuprofen reduces iNOS activity in rat primary cerebellar glial cells.
  • To examine the effect of ibuprofen on COX mRNA expression and prostaglandin E2 (PGE2) formation.
  • To correlate ibuprofen's effects on iNOS and COX pathways with its potential therapeutic role in Alzheimer's disease.

Main Methods:

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  • Rat primary cerebellar glial cell cultures were stimulated with lipopolysaccharide (LPS) and interferon-gamma (INFgamma).
  • Ibuprofen's effects on iNOS activity, iNOS mRNA levels, and iNOS protein levels (Western blot) were assessed.
  • COX mRNA expression and PGE2 formation were measured following ibuprofen treatment.

Main Results:

  • Ibuprofen did not directly inhibit iNOS catalytic activity but reduced it when co-administered with LPS/INFgamma (IC50 = 0.76 mM).
  • Ibuprofen decreased iNOS protein levels (IC50 = 0.89 mM) but showed no correlation with iNOS mRNA reduction.
  • Ibuprofen inhibited PGE2 formation (IC50 = 0.86 mM) but did not affect COX-1 or COX-2 mRNA expression.

Conclusions:

  • Ibuprofen's reduction of iNOS activity appears to be mediated by post-transcriptional mechanisms, likely involving protein degradation.
  • The similar potency of ibuprofen in inhibiting PGE2 formation and reducing iNOS activity suggests a dual anti-inflammatory action.
  • Reduced iNOS protein levels in the brain at therapeutic doses may contribute to neuronal protection in Alzheimer's disease.