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Calcium channel antagonists and adenosine analogues decrease tolerance to opiate pentazocine and U 50488H

E Contreras1, L Quijada, A Germany

  • 1Department of Pharmacology, Faculty of Biological Sciences, University of Concepción, Santiago, Chile.

General Pharmacology
|September 1, 1993
PubMed
Summary
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A single dose of pentazocine caused tolerance to kappa-opioid analgesia. Calcium channel blockers and an adenosine agonist reduced this tolerance, suggesting their role in kappa-opioid pain relief.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Pain Management

Background:

  • Pentazocine, a kappa-opioid agonist, can induce tolerance to its analgesic effects.
  • Understanding the mechanisms of opioid tolerance is crucial for effective pain management.

Purpose of the Study:

  • To investigate the role of calcium channels and adenosine in pentazocine-induced cross-tolerance to kappa-opioids.
  • To explore potential therapeutic targets for modulating opioid tolerance.

Main Methods:

  • Inducing cross-tolerance with a single dose of pentazocine.
  • Assessing analgesia using the hot plate test and acetic acid administration.
  • Administering calcium channel antagonists (diltiazem, nifedipine, verapamil) and adenosine agonists (N6-cyclopentyl adenosine, N6-cyclohexyladenosine).

Related Experiment Videos

Main Results:

  • Pentazocine induced cross-tolerance to the kappa-opioid U-50488H.
  • Calcium channel antagonists significantly reduced the development of tolerance.
  • N6-cyclopentyl adenosine diminished tolerance, while N6-cyclohexyladenosine interfered with analgesic assessment.

Conclusions:

  • Calcium channel function is implicated in the development of tolerance to kappa-opioids.
  • Adenosine signaling pathways may also play a role in modulating opioid analgesia and tolerance.
  • These findings suggest potential strategies for managing opioid tolerance.