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D2-specific discriminative stimuli: parameters, blocking, and rebound

E M Huffman1, W F Caul, E J Strand

  • 1Department of Psychology, Vanderbilt University, Nashville, TN 37240, USA.

Pharmacology, Biochemistry, and Behavior
|May 1, 1995
PubMed
Summary
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This study examined how quinpirole, a D2 agonist, and spiperone, a D2 antagonist, affect rat behavior. Chronic spiperone did not cause the predicted rebound effect, suggesting complex D2 receptor dynamics.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Dopamine D2 receptors play a crucial role in regulating behavior.
  • Quinpirole (a selective D2 agonist) and spiperone (a selective D2 antagonist) are key pharmacological tools for studying D2 receptor function.

Purpose of the Study:

  • To characterize the discriminative stimulus properties of quinpirole.
  • To assess the antagonist capabilities of spiperone in blocking quinpirole's effects.
  • To investigate the effects of chronic D2 receptor antagonist treatment on drug discrimination.

Main Methods:

  • Rats were trained to discriminate quinpirole from a neutral stimulus.
  • Dose-response and time-course analyses were conducted for quinpirole.
  • Spiperone's blocking effects on quinpirole discrimination were evaluated at various doses and time points.

Related Experiment Videos

  • Chronic administration of spiperone or haloperidol was employed to assess long-term effects.

    • Main Results:

    • Quinpirole produced a dose-dependent discriminative stimulus in rats.
    • Spiperone effectively blocked the discriminative effects of quinpirole.
    • Contrary to predictions, chronic treatment with spiperone or haloperidol did not result in a rebound increase in quinpirole-appropriate responding.

    Conclusions:

    • The study provides detailed parametric data on quinpirole's cue properties and spiperone's antagonism at D2 receptors.
    • The lack of a predicted rebound effect after chronic antagonist treatment suggests that D2 receptor systems may adapt in ways not fully captured by this specific experimental design.
    • Further research with varied doses and time parameters is warranted to fully understand the long-term consequences of D2 receptor modulation.