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Published on: July 29, 2014

The cannabinoid receptor agonist, WIN 55, 212-2, attenuates tumor-evoked hyperalgesia through peripheral mechanisms

Carl Potenzieri1, Catherine Harding-Rose, Donald A Simone

  • 1Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, MN 55455, USA.

Brain Research
|May 20, 2008
PubMed

Insights

Peripherally administered cannabinoids, like WIN 55,212-2, effectively reduced cancer pain and mechanical hyperalgesia in mice. This pain relief involved activating both cannabinoid 1 (CB1) and cannabinoid 2 (CB2) receptors.

Area of Science:

  • Pharmacology
  • Pain Research
  • Oncology

Background:

  • Cannabinoids show potential for pain relief through peripheral mechanisms.
  • Cancer pain is a significant clinical challenge, necessitating novel therapeutic strategies.
  • Rodent models are crucial for investigating cancer pain mechanisms and treatments.

Purpose of the Study:

  • To evaluate the efficacy of peripherally administered cannabinoids in a murine model of cancer pain.
  • To investigate the role of cannabinoid receptors in mediating pain relief.
  • To assess the safety profile of cannabinoid administration in this model.

Main Methods:

  • A murine model of cancer pain was established by injecting fibrosarcoma cells into the calcaneus bone.
  • Mechanical hyperalgesia was quantified by measuring paw withdrawal responses to von Frey filament stimulation.
  • WIN 55,212-2 was administered peripherally, and its effects were assessed alone and with cannabinoid receptor antagonists (AM251, AM630).

Main Results:

  • Peripherally administered WIN 55,212-2 dose-dependently reduced tumor-evoked mechanical hyperalgesia.
  • The antihyperalgesic effect was specific to the tumor-bearing paw and did not cause catalepsy at effective doses.
  • Co-administration of WIN 55,212-2 with CB1 and CB2 receptor antagonists diminished its pain-relieving effects.

Conclusions:

  • Peripherally administered WIN 55,212-2 effectively attenuates cancer pain and mechanical hyperalgesia in a murine model.
  • The therapeutic effects are mediated through the activation of both peripheral cannabinoid 1 and cannabinoid 2 receptors.
  • These findings support the potential of peripherally acting cannabinoids as a treatment for cancer pain.

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