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Related Experiment Videos

Dynorphin A modulates acute and chronic opioid effects

L P Hooke1, L He, N M Lee

  • 1Department of Pharmacology, University of Minnesota Medical School, Minneapolis, USA.

The Journal of Pharmacology and Experimental Therapeutics
|April 1, 1995
PubMed
Summary

Dynorphin A-(1-13) [dyn A(1-13)] and its non-opioid analog dyn A(2-17) effectively suppress opioid withdrawal and tolerance in mice. Repeated dosing of dyn A(1-13) significantly enhanced these effects, demonstrating dose-dependent efficacy.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Opioid dependence is characterized by withdrawal symptoms and tolerance development.
  • Dynorphin peptides play complex roles in opioid systems.
  • Investigating non-opioid modulators offers novel therapeutic avenues.

Purpose of the Study:

  • To evaluate the efficacy of dynorphin A-(1-13) [dyn A(1-13)] and its analog dyn A(2-17) in suppressing opioid withdrawal and tolerance.
  • To investigate the dose-dependent and time-dependent effects of dyn A(1-13).
  • To confirm the non-opioid mechanism of action for these modulatory effects.

Main Methods:

  • Morphine-dependent mice were used to assess opioid withdrawal and tolerance.
  • Dyn A(1-13) and dyn A(2-17) were administered at various doses and regimens.

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  • Naloxone was used to precipitate withdrawal jumping, and ED50 was calculated.
  • Effects were compared between single and repeated dosing protocols.

    • Main Results:

    • A single dose of dyn A(1-13) suppressed opioid withdrawal and tolerance.
    • The non-opioid peptide dyn A(2-17) demonstrated comparable efficacy to dyn A(1-13).
    • Repeated daily administration of dyn A(1-13) enhanced its suppressive effects in a dose-dependent manner, with maximal effect observed at 8.4 mumol/kg, increasing naloxone ED50 nearly 6-fold.

    Conclusions:

    • Dyn A(1-13) is effective in mitigating opioid withdrawal and tolerance.
    • The non-opioid analog dyn A(2-17) retains significant modulatory activity.
    • Repeated dosing strategies can potentiate the therapeutic effects of dyn A(1-13), highlighting its potential as a non-addictive therapeutic agent for opioid dependence.