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The impact of systemic blockade of dopamine receptors on the acquisition of two-way active avoidance in male rats

  • 0Laboratory of Biological Psychology, KU Leuven, Belgium; Leuven Brain Institute, KU Leuven, Belgium.
Neurobiology of Learning and Memory +

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March 8, 2025

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March 8, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Blocking dopamine D1 receptors (DRs) acutely impairs active threat avoidance learning in rats, but this effect does not persist after the drug is cleared. This suggests D1R blockade disrupts behavior performance, not long-term learning.

Area Of Science

  • Neuroscience
  • Behavioral Pharmacology
  • Learning and Memory

Background

  • Active threat avoidance is crucial for survival but its neural underpinnings are not fully understood.
  • Dopaminergic receptors (DRs) are implicated in behavior, yet their specific role in avoidance learning and the persistence of drug effects requires clarification.

Purpose Of The Study

  • To investigate the role of dopamine D1 receptors (D1R) and D2 receptors (D2R) in the acquisition of active threat avoidance behavior.
  • To determine if the blockade of D1R during avoidance learning has lasting effects on behavior in a drug-free state.

Main Methods

  • Two experiments using male Wistar rats were conducted, involving a shuttle box avoidance task with tone-shock pairings.
  • Rats were administered D1R antagonist SCH23390 or D2R antagonist sulpiride (or vehicle) before training.
  • Experiment 2 included a drug-free follow-up test 24 hours after training to assess sustained effects.

Main Results

  • D2R antagonist sulpiride did not affect avoidance responses.
  • Acute administration of D1R antagonist SCH23390 (0.05 mg/kg) significantly reduced avoidance responses and locomotor activity.
  • Lower dose SCH23390 (0.025 mg/kg) also reduced avoidance, but this deficit did not persist in a drug-free test 24 hours later.

Conclusions

  • Dopamine D1 receptor blockade acutely disrupts the performance of active threat avoidance behavior.
  • The observed deficits in avoidance behavior following D1R blockade are likely due to acute interference with performance rather than a lasting impairment of avoidance learning.

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