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Related Experiment Videos

Interaction between LSD and dopamine D2/3 binding sites in pig brain.

Luciano Minuzzi1, George G Nomikos, Mark R Wade

  • 1Aarhus University PET Centre, and Centre for Functionally Integrative Neuroscience, Aarhus University Hospital, Aarhus, Denmark. luciano@pet.auh.dk

Synapse (New York, N.Y.)
|April 2, 2005
PubMed
Summary

Lysergic acid diethylamide (LSD) may interact directly with dopamine D2/3 receptors in the brain. This study found reduced dopamine D2/3 receptor availability after LSD administration in pigs, suggesting a novel mechanism for its psychoactive effects.

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Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Radiochemistry

Background:

  • Psychoactive effects of LSD are linked to serotonin 5HT2 receptors.
  • The impact of LSD on dopamine D2/3 receptor availability in living brains remains unexplored.

Purpose of the Study:

  • To investigate the potential effects of LSD on dopamine D2/3 receptor availability in vivo.
  • To explore the direct interaction of LSD with dopamine D2/3 receptors.

Main Methods:

  • Positron Emission Tomography (PET) with [11C]raclopride to measure dopamine D2/3 receptor binding potential (pB) in pigs before and after LSD administration.
  • In vitro radioligand displacement assays using LSD and [3H]raclopride on pig brain sections.
  • In vivo microdialysis in rats to assess dopamine and metabolite levels after LSD administration.

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Main Results:

  • PET imaging revealed a significant reduction in striatal dopamine D2/3 receptor pB by 19% at 4 hours post-LSD administration in pigs.
  • Cerebral blood flow remained unchanged, indicating the observed effect was specific to receptor binding.
  • In vitro studies demonstrated LSD's ability to displace [3H]raclopride, suggesting interaction with a subpopulation of dopamine D2/3 receptors.
  • Microdialysis experiments showed no significant changes in dopamine or its metabolites in rat striatum following LSD treatment.

Conclusions:

  • LSD directly interacts with a subset of dopamine D2/3 receptors in the pig brain.
  • This interaction may contribute to the psychopharmacological profile of LSD.
  • The findings open new avenues for understanding LSD's mechanism of action beyond serotonin receptor interactions.