Psychopharmacology

, Volume 189, Issue 3, pp 319–329

The roles of 5-HT1A and 5-HT2 receptors in the effects of 5-MeO-DMT on locomotor activity and prepulse inhibition in rats

  • Kirsten Krebs-Thomson
  • Erbert M. Ruiz
  • Virginia Masten
  • Mahalah Buell
  • Mark A. Geyer
Original Investigation

Abstract

Rationale

The hallucinogen 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) is structurally similar to other indoleamine hallucinogens such as LSD. The present study examined the effects of 5-MeO-DMT in rats using the Behavioral Pattern Monitor (BPM), which enables analyses of patterns of locomotor activity and exploration, and the prepulse inhibition of startle (PPI) paradigm.

Objectives

A series of interaction studies using the serotonin (5-HT)1A antagonist WAY-100635 (1.0 mg/kg), the 5-HT2A antagonist M100907 (1.0 mg/kg), and the 5-HT2C antagonist SER-082 (0.5 mg/kg) were performed to assess the respective contributions of these receptors to the behavioral effects of 5-MeO-DMT (0.01, 0.1, and 1.0 mg/kg) in the BPM and PPI paradigms.

Results

5-MeO-DMT decreased locomotor activity, investigatory behavior, the time spent in the center of the BPM chamber, and disrupted PPI. All of these effects were antagonized by WAY-100635 pretreatment. M100907 pretreatment failed to attenuate any of these effects, while SER-082 pretreatment only antagonized the PPI disruption produced by 5-MeO-DMT.

Conclusions

While the prevailing view was that the activation of 5-HT2 receptors is solely responsible for hallucinogenic drug effects, these results support a role for 5-HT1A receptors in the effects of the indoleamine hallucinogen 5-MeO-DMT on locomotor activity and PPI in rats.

Keywords

Hallucinogen 5-MeO-DMT M100907 SER-082 WAY-100635 Rat Locomotion Startle Prepulse inhibition PPI 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Kirsten Krebs-Thomson
    • 1
  • Erbert M. Ruiz
    • 1
  • Virginia Masten
    • 1
  • Mahalah Buell
    • 1
  • Mark A. Geyer
    • 1
  1. 1.Department of PsychiatryUniversity of California, San DiegoLa JollaUSA

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