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Related Experiment Videos

The spinal phospholipase-cyclooxygenase-prostanoid cascade in nociceptive processing.

Camilla I Svensson1, Tony L Yaksh

  • 1Department of Anesthesiology, University of California, San Diego, La Jolla, California 92093-0818, USA. csvensson@ucsd.edu

Annual Review of Pharmacology and Toxicology
|January 25, 2002
PubMed
Summary

Spinal phospholipase A2 (PLA2) and cyclooxygenase-2 (COX-2) inhibitors reduce pain states. The primary pain relief mechanism involves modulating constitutive spinal COX-2, not upregulated forms.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Research

Background:

  • Peripheral injury and inflammation induce facilitated pain states.
  • Spinal phospholipase A2 (PLA2) and cyclooxygenase-2 (COX-2) pathways are implicated in pain signaling.
  • Prostaglandins, produced by COX enzymes, affect spinal neuronal excitability.

Purpose of the Study:

  • To investigate the role of spinal PLA2 and COX-2 in facilitated pain states.
  • To determine the contribution of constitutive versus upregulated spinal COX-2 to antihyperalgesic effects.

Main Methods:

  • Administration of intrathecal PLA2 and COX-2 inhibitors.
  • Assessment of pain states induced by peripheral stimuli and direct spinal receptor activation.
  • Analysis of spinal COX-2 expression patterns.

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Main Results:

  • Intrathecal PLA2 and COX-2 inhibitors, but not COX-1 inhibitors, attenuated facilitated pain.
  • These effects were observed in both inflammation-associated and non-inflammatory hyperalgesic states.
  • Antihyperalgesic activity of COX-2 inhibitors occurred before significant COX-2 upregulation.

Conclusions:

  • Constitutive spinal COX-2 plays a significant role in mediating antihyperalgesic effects of COX-2 inhibitors.
  • Modulation of constitutive spinal COX-2 is a primary mechanism for pain relief.
  • Spinal PLA2 and COX-2 pathways are critical targets for managing facilitated pain.