INTERACTION OF PHENCYCLIDINE (ANGEL DUST) WITH A SPECIFIC RECEPTOR IN RAT-BRAIN MEMBRANES

[3H]Phencyclidine binds to synaptic membranes from rat brain in a saturable, reversible, and selective fashion, with a dissociation constant of K(d) of 0.25 μM and a maximal binding capacity of 2.4 pmol/mg of membrane protein - i.e., 250 pmol/g of brain. The binding activity is concentrated in synaptosomal fractions, is higher in cerebral cortex and corpus striatum than in other parts of the rat brain, and is not detectable in the spinal cord. Only molecules of the phencyclidine series and ketamine are able to bind to the phencyclidine receptor. [3H]Phencyclidine bound to its receptor is not displaced by the classical neurotransmitters or neuromodulators. There is a good correlation between the apparent affinities of a series of phencyclidine analogs for the phencyclidine receptor and the pharmacological activities of these analogs as measured by the rotarod assay.