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A Modified Inflammatory Pain Model to Study the Analgesic Effect in Mice
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Inflammation-induced decrease in voluntary wheel running in mice: a nonreflexive test for evaluating inflammatory

Enrique J Cobos1, Nader Ghasemlou, Dionéia Araldi

  • 1Program in Neurobiology, F.M. Kirby Neurobiology Center, Children's Hospital Boston, Boston, MA 02115, USA Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.

Pain
|February 21, 2012
PubMed
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Voluntary wheel running in mice is a sensitive indicator of inflammatory pain, showing significant decreases after inflammation. This measure is more sensitive to pain relief than traditional methods and responds to lower drug doses.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Research

Background:

  • Inflammatory pain significantly impairs patients' quality of life and mobility.
  • Assessing pain-related functional deficits is crucial for effective treatment development.

Purpose of the Study:

  • To evaluate voluntary wheel running as a sensitive, objective measure of inflammatory pain in mice.
  • To compare the sensitivity of wheel running to mechanical hypersensitivity and analgesic drug effects.

Main Methods:

  • Peripheral inflammation was induced in mice using complete Freund's adjuvant (CFA).
  • Voluntary wheel running (distance traveled) and mechanical hypersensitivity (von Frey hairs) were measured.
  • The effects of various anti-inflammatory and analgesic drugs on wheel running and hypersensitivity were assessed.

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Main Results:

  • CFA-induced hind paw inflammation significantly reduced voluntary wheel running, peaking at 24 hours.
  • Recovery of wheel running correlated with weight-bearing ability and preceded full recovery of mechanical sensitivity.
  • Anti-inflammatory drugs and morphine reversed the decrease in wheel running at doses lower than those affecting mechanical allodynia.

Conclusions:

  • Voluntary wheel running is a simple, observer-independent measure of functional impairment due to inflammatory pain.
  • Wheel running is a more sensitive indicator of pain and analgesic efficacy than mechanical hypersensitivity measures.
  • This method offers a valuable preclinical tool for assessing pain and drug effects in inflammatory conditions.