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Related Experiment Videos

Opioid-dopamine interaction in planaria: a behavioral study.

F Passarelli1, A Merante, F E Pontieri

  • 1Department of Neuroscience, University La Sapienza, Rome, Italy.

Comparative Biochemistry and Physiology. Part C, Pharmacology, Toxicology & Endocrinology
|December 1, 1999
PubMed
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Planaria exhibit kappa opioid receptor activity, showing increased motor function and specific movements when exposed to kappa agonists. These responses suggest an interaction between opioid and dopamine systems in planaria.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Zoology

Background:

  • Planaria possess a simple nervous system, making them a valuable model for studying fundamental neurobiological processes.
  • Opioid receptors are crucial in regulating motor activity and behavior in various animal models.
  • The interaction between opioid and dopamine systems is a key area of research in neuroscience.

Purpose of the Study:

  • To investigate the presence and function of opioid receptors in planaria.
  • To characterize the behavioral responses of planaria to selective opioid agonists.
  • To explore potential interactions between the opioid and dopamine systems in planaria.

Main Methods:

  • Planaria were exposed to selective mu, delta, and kappa opioid agonists at various doses.

Related Experiment Videos

  • Behavioral responses, including motor activity, C-like position (CLP), screw-like hyperkinesia (SLH), and snake-like movements (SLM), were recorded.
  • The effects of opioid antagonists (naloxone, Nor-binaltorphimine) and dopamine receptor antagonists (sulpiride, SH-23390) were assessed.

    • Main Results:

    • Mu and delta opioid agonists did not alter planarian motor activity.
    • Kappa opioid agonists (U50,488 and bremazocine-HCl) dose-dependently increased motor activity, inducing CLP and SLH.
    • Higher doses of kappa agonists elicited SLM, which was blocked by kappa antagonists.
    • Dopamine receptor antagonists blocked specific behavioral responses induced by kappa agonists.

    Conclusions:

    • The study provides evidence for the presence of functional kappa opioid receptors in planaria.
    • Planarian behavior in response to opioid agonists suggests a complex interplay between opioid and dopamine systems.
    • Planaria serve as a relevant model for investigating conserved neurochemical pathways and system interactions.