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Related Experiment Videos

Morphine-Induced mu-opioid receptor desensitization.

Vu C Dang1, John T Williams

  • 1Vollum Institute, Oregon Health Sciences University, Portland, OR 97239, USA.

Molecular Pharmacology
|July 16, 2005
PubMed
Summary

Morphine, previously thought to sustain signaling, actually causes short-term desensitization in locus ceruleus neurons. Long-term morphine treatment further facilitates this desensitization, impacting opioid signaling.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Morphine is a widely used opioid agonist.
  • It was believed to sustain signaling without causing receptor desensitization or internalization.
  • This belief led to hypotheses about long-term morphine effects on tolerance and dependence.

Purpose of the Study:

  • To investigate whether morphine causes receptor desensitization.
  • To compare morphine-induced desensitization with that of [MET](5)-enkephalin (ME).
  • To examine the effects of long-term morphine treatment on morphine-induced desensitization.

Main Methods:

  • Whole-cell recordings were used to measure potassium currents in locus ceruleus neurons.
  • Neurons were exposed to morphine and [MET](5)-enkephalin.
  • Experiments were conducted on both untreated and morphine-treated animal tissues.

Main Results:

  • Morphine was found to induce short-term desensitization, contrary to previous assumptions.
  • Morphine-induced desensitization was slower and less pronounced than that induced by ME.
  • In tissues from morphine-treated animals, desensitization to morphine was facilitated, while peak current remained unchanged.

Conclusions:

  • Morphine, similar to other opioid agonists, can initiate receptor desensitization.
  • This desensitization serves to decrease signaling.
  • Findings challenge the long-held view of morphine as a non-desensitizing agonist.

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