Metaphit is a research chemical that acts on certain binding sites in the central nervous system (CNS). It is structurally related to the drug phencyclidine (PCP) and binds irreversibly to the PCP binding site on the NMDA receptor. However, further studies have suggested that its effects may be mediated by other sites in the CNS and are not necessarily related to the NMDA receptor.
Metaphit has been shown to prevent d-amphetamine-induced hyperactivity and decrease dopamine levels in the nucleus accumbens, a region of the brain involved in reward and pleasure. It was also the first acylating ligand used to study the cocaine receptor. Metaphit is a structural isomer of the compound fourphit, both of which are derived from an analogous scaffold shared with PCP and are modified with an isothiocyanate group.
Metaphit has been studied using a test for catalepsy in pigeons, which is sensitive to the effects of PCP and related drugs. It has been shown to increase the cataleptic effects of various drugs that have PCP-like actions, including PCP itself, ketamine, and m-amino PCP, as well as other drugs such as dexoxadrol, LY 154716, and cyclazocine. Analysis of the interactions between metaphit and these drugs suggests that metaphit may act as a less potent, long-acting agonist at PCP binding sites, rather than as an antagonist. Its ability to potentiate the effects of these drugs does not appear to be related to its effects on the metabolism of these drugs.
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