Hallucinogen-like effects of N,N-dipropyltryptamine (DPT): Possible mediation by serotonin 5-HT1A and 5-HT2A receptors in rodents

Oct 2, 2007Pharmacology, biochemistry, and behavior

Hallucinogen-like effects of N,N-dipropyltryptamine (DPT) in rodents linked to serotonin 5-HT1A and 5-HT2A receptors

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Abstract

DPT produced dose-dependent effects in a head-twitch assay in mice.

The head-twitch assay revealed a biphasic dose-effect curve for DPT.
WAY-100635 shifted the dose-effect curve for head twitches, indicating a surmountable antagonism.
M100907 demonstrated functionally insurmountable antagonist effects on DPT-induced behaviors.
DPT showed partial to full substitution in rats trained to recognize LSD, psilocybin, or MDMA.
M100907's antagonistic effects on DPT were more pronounced compared to those of WAY-100635.
The findings suggest that the 5-HT2A receptor is a key site of action for DPT, with possible involvement of the 5-HT1A receptor.

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N,N-dipropyltryptamine (DPT) is a synthetic tryptamine hallucinogen which has been used psychotherapeutically in humans, but has been studied preclinically only rarely. In the present studies, DPT was tested in a drug-elicited head-twitch assay in mice, and in rats trained to discriminate lysergic acid diethylamide (LSD), N,N-dimethyl-4-phosphoryloxytryptamine (psilocybin), or 3,4-methylenedioxymethamphetamine (MDMA). A separate group of rats was also trained to recognize DPT itself as a discriminative stimulus, and in all cases, the behavioral effects of DPT were challenged with the selective serotonin (5-HT)2A antagonist M100907, the 5-HT1A selective antagonist WAY-100635, or their combination. In the head-twitch assay, DPT elicited dose-dependent effects, producing a biphasic dose-effect curve. WAY-100635 produced a parallel rightward shift in the dose-effect curve for head twitches, indicative of surmountable antagonism, but the antagonist effects of M100907 were functionally insurmountable. DPT produced partial to full substitution when tested in rats trained to discriminate LSD, psilocybin or MDMA, and served as a discriminative stimulus. In all cases, the antagonist effects of M100907 were more profound than were those of WAY-100635. DPT is thus active in two rodent models relevant to 5-HT2 agonist activity. The effectiveness with which M100907 antagonizes the behavioral actions of this compound strongly suggest that the 5-HT2A receptor is an important site of action for DPT, but the modulatory actions of WAY-100635 also imply a 5-HT1A-mediated component to the actions of this compound.

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Hallucinogen-like effects of N,N-dipropyltryptamine (DPT): Possible mediation by serotonin 5-HT1A and 5-HT2A receptors in rodents

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