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Dopamine receptor contribution to the action of PCP, LSD and ketamine psychotomimetics.

P Seeman, F Ko, T Tallerico

Molecular Psychiatry September 1, 2005 DOI: 10.1038/sj.mp.4001682 (opens in new tab)

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Study at a glance

AI-extracted from the abstract
Characteristics In vitro binding study Peer reviewed
Population Human cloned dopamine D2 receptors and rat striatal tissue
Topics Esketamine Ketamine LSD
Key points Phencyclidine, ketamine, dizocilpine, and LSD have higher affinity for the D2High receptor than for the NMDA receptor, indicating that their psychotomimetic effects involve D2 agonism.

Abstract

Although phencyclidine and ketamine are used to model a hypoglutamate theory of schizophrenia, their selectivity for NMDA receptors has been questioned. To determine the affinities of phencyclidine, ketamine, dizocilpine and LSD for the functional high-affinity state of the dopamine D2 receptor, D2High, their dissociation constants (Ki) were obtained on [3H]domperidone binding to human cloned dopamine D2 receptors. Phencyclidine had a high affinity for D2High with a Ki of 2.7 nM, in contrast to its low affinity for the NMDA receptor, with a Ki of 313 nM, as labeled by [3H]dizocilpine on rat striatal tissue. Ketamine also had a high affinity for D2High with a Ki of 55 nM, an affinity higher than its 3100 nM Ki for the NMDA sites. Dizocilpine had a Ki of 0.3 nM at D2High, but a Kd of 1.8 nM at the NMDA receptor. LSD had a Ki of 2 nM at D2High. Because the psychotomimetics had higher potency at D2High than at the NMDA site, the psychotomimetic action of these drugs must have a major contribution from D2 agonism. Because these drugs have a combined action on both dopamine receptors and NMDA receptors, these drugs, when given in vivo, test a combined hyperdopamine and hypoglutamate theory of psychosis.

Comparable studies

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Transcriptome Fingerprints Distinguish Hallucinogenic and Nonhallucinogenic 5-Hydroxytryptamine 2A Receptor Agonist Effects in Mouse Somatosensory Cortex Human embryonic kidney 293 cells stably expressing 5-HT2ARs; wild-type and 5-HT2AR... 2003 Experimental study
Evidence for a central 5‐hydroxytryptamine receptor stimulation by lysergic acid diethylamide Rats 1968 Experimental study
Psychedelics, but Not Ketamine, Produce Persistent Antidepressant-like Effects in a Rodent Experimental System for the Study of Depression Rats 2020 Preclinical study
Lysergic acid diethylamide (LSD) promotes social behavior through mTORC1 in the excitatory neurotransmission Male mice 2021 Multidisciplinary experimental study with in vivo electrophysiology, optogenetics, behavioral paradigms, molecular biology, and conditional knockout mice
A non-hallucinogenic LSD analog with therapeutic potential for mood disorders. Mice and cultured rat cortical neurons 2023 Preclinical study

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Esketamine Ketamine LSD