Biphasic effect of 5-methoxy-N,N-dimethyltryptamine on rat prolactin secretion

Miljana Simonovic*, Herbert Y. Meltzer

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations


5-Methoxy-N,N-dimethyltryptamine (5-MeODMT), a potent serotonin (5-HT) receptor agonist, exerts a biphasic effect on rat prolactin (PRL) secretion. 5-MeODMT (2.5-10 mg/kg) produces a marked, dose-related but short-lasting (less than 30 min) rise in serum PRL levels. At intervals longer than 30 min, 5-MeODMT (1-15 mg/kg) inhibits the stimulation of PRL secretion by another 5-HT agonist, 5-methoxytryptamine (5-MeOT, 10 mg/kg), by α-methylparatyrosine (50 mg/kg) or by haloperidol (0.15 mg/kg). 5-MeODMT did not significantly alter the PRL-releasing effect of γ-butyrolactone (500 mg/kg) or a higher dose of haloperidol (1 mg/kg). The biphasic effect of 5-MeODMT on rat PRL secretion is shared by the centrally-acting 5-HT agonist quipazine, but not by 5-MeOT, an indole derivative excluded by the blood-brain barrier. The initial stimulation of PRL secretion by 5-MeODMT is probably due to its ability to activate postsynaptic 5-HT receptors. The subsequent inhibitory effect of 5-MeODMT appears to be due to increased functional activity of tuberoinfundibular dopamine neurons. The possible mechanisms underlying the inhibitory effect of 5-MeODMT on PRL release are discussed.

Original languageEnglish (US)
Pages (from-to)269-275
Number of pages7
JournalBrain research
Issue number2
StatePublished - Aug 8 1983


  • 5-methoxy-N,N-dimethyltryptamine
  • dopamine
  • prolactin
  • serotonin
  • tuberoinfundibular neurons

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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