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Stimulus control by 5-methoxy-N,N-dimethyltryptamine in wild-type and CYP2D6-humanized mice.

J C Winter1, D J Amorosi, Kenner C Rice

  • 1Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, University at Buffalo, 102 Farber Hall, Buffalo, NY 14214-3000, USA. jcwinter@buffalo.edu

Pharmacology, Biochemistry, and Behavior
|June 1, 2011
PubMed
Summary

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This study found that genetically modified mice (Tg-CYP2D6) and wild-type mice acquired 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) stimulus control similarly. Harmaline enhanced 5-MeO-DMT

Area of Science:

  • Pharmacology
  • Neuroscience
  • Genetics

Background:

  • Previous studies indicated Tg-CYP2D6 mice exhibit altered bufotenine metabolism compared to wild-type mice.
  • 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) and bufotenine are tryptamines with distinct pharmacological profiles.
  • Harmaline is a known MAO inhibitor that can affect tryptamine metabolism and signaling.

Purpose of the Study:

  • To investigate the acquisition of 5-MeO-DMT-induced stimulus control in wild-type and Tg-CYP2D6 mice.
  • To compare the behavioral effects of bufotenine and acetylbufotenine in these mouse models.
  • To determine the modulatory effect of harmaline on 5-MeO-DMT stimulus control.

Main Methods:

  • Establishing 5-MeO-DMT stimulus control in wild-type and Tg-CYP2D6 mice using operant conditioning.

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  • Testing the stimulus generalization properties of bufotenine and acetylbufotenine.
  • Administering harmaline alone and in combination with 5-MeO-DMT to assess its modulatory effects.
  • Main Results:

    • Both wild-type and Tg-CYP2D6 mice acquired 5-MeO-DMT stimulus control at similar rates.
    • Bufotenine did not elicit 5-MeO-DMT-appropriate responding, while acetylbufotenine produced intermediate responding.
    • Harmaline significantly enhanced 5-MeO-DMT-appropriate responding in both mouse groups, and harmaline alone induced such responding in Tg-CYP2D6 mice.

    Conclusions:

    • Wild-type and Tg-CYP2D6 mice exhibit comparable acquisition of 5-MeO-DMT stimulus control.
    • Bufotenine and acetylbufotenine do not fully substitute for 5-MeO-DMT in stimulus control paradigms.
    • Harmaline potentiates the stimulus effects of 5-MeO-DMT in both wild-type and Tg-CYP2D6 mice, suggesting a role in modulating tryptamine signaling.