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Neurotoxic prostaglandin J2 enhances cyclooxygenase-2 expression in neuronal cells through the p38MAPK pathway: a

Zongmin Li1, Marlon Jansen, Kenyon Ogburn

  • 1Department of Biological Sciences, Hunter College of City University of New York, New York, New York 10021, USA.

Journal of Neuroscience Research
|November 4, 2004
PubMed

Insights

Prostaglandin J2 (PGJ2) boosts cyclooxygenase-2 (COX-2) expression in neurons, potentially driving neurodegeneration. Antioxidants like N-acetylcysteine may protect against this self-destructive inflammatory loop.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • The role of cyclooxygenase-2 (COX-2) in neurodegeneration is unclear.
  • Prostaglandins (PG) of the J2 series, like PGJ2, are neurotoxic metabolic products.
  • Inflammatory processes are implicated in neurodegenerative diseases.

Purpose of the Study:

  • To investigate the effect of PGJ2 on COX-2 expression and activity in neuronal cells.
  • To elucidate the molecular mechanisms underlying PGJ2-induced COX-2 up-regulation.
  • To explore potential therapeutic strategies against PGJ2-mediated neurotoxicity.

Main Methods:

  • Neuronal cell culture treated with PGJ2 and its derivatives.
  • Measurement of COX-2 and COX-1 gene expression and enzyme activity.
  • Analysis of signaling pathways including PPARgamma, NFkappaB, p38MAPK, and JNK.
  • Assessment of cell viability using thiol-reducing agents.

Main Results:

  • PGJ2 selectively enhanced COX-2 gene expression and activity in neurons, independent of PPARgamma and NFkappaB.
  • PGJ2 increased Interleukin-1 (IL1) mRNA levels, suggesting a role for IL1 in the feedback loop.
  • COX-2 up-regulation by PGJ2 was mediated by p38MAPK activation.
  • N-acetylcysteine, but not ascorbic acid, protected neurons from PGJ2 toxicity.

Conclusions:

  • PGJ2 initiates a self-destructive autotoxic loop with COX-2, exacerbating neurodegeneration.
  • This loop involves IL1 and p38MAPK signaling.
  • Thiol-reducing antioxidants represent a promising therapeutic approach to halt this neurodegenerative process.

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