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Altered neuroadaptation in opiate dependence and neurogenic inflammatory nociception in alpha CGRP-deficient mice

A M Salmon1, M I Damaj, L M Marubio

  • 1CNRS URA 2182, Neurobiologie Moléculaire, Institut Pasteur, 25 rue du Docteur Roux, 75724 Paris Cedex 15, France.

Nature Neuroscience
|March 29, 2001
PubMed

Insights

Mice lacking alpha CGRP (calcitonin gene-related peptide) showed reduced responses to pain and inflammation. These mice also exhibited significantly fewer signs of opioid withdrawal, indicating CGRP

Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Research

Background:

  • The neuropeptide alpha CGRP (calcitonin gene-related peptide) plays a role in pain signaling.
  • Its exact contribution to pain and opioid withdrawal is not fully understood.

Purpose of the Study:

  • To investigate the role of alpha CGRP in pain, inflammation, and opioid withdrawal.
  • To determine the effects of alpha CGRP deficiency on pain responses and opioid-related behaviors.

Main Methods:

  • Utilized genetically modified mice lacking the alpha CGRP gene (alpha CGRP(-/-) mice).
  • Assessed responses to chemical pain and inflammation.
  • Evaluated heroin self-administration, morphine tolerance, and morphine withdrawal signs.

Main Results:

  • Mice lacking alpha CGRP demonstrated an attenuated response to chemical pain and inflammation.
  • No significant changes were observed in heroin self-administration or morphine tolerance in alpha CGRP(-/-) mice.
  • A marked decrease in morphine withdrawal signs was observed in mice lacking alpha CGRP.

Conclusions:

  • Alpha CGRP plays a significant role in mediating pain and inflammatory responses.
  • Alpha CGRP is importantly involved in the manifestation of opioid withdrawal symptoms.
  • Targeting alpha CGRP may offer a novel therapeutic strategy for managing opioid withdrawal.

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