title: Effects of phencyclidine and its derivatives on enteric neurones.
abstract: The effects of N-(1-phenylcyclohexyl) piperidine (PCP) and related drugs on isolated intact segments of the guinea-pig ileum were determined. 1-1-(2-Thienyl) cyclohexylpiperidine (TCP), PCP and ketamine decreased the height of electrically induced contractions (0.1 Hz) of intact segments of isolated guinea-pig ileum. Thirty to forty percent of the inhibition of contraction height (0.1 Hz) was reversed by pretreatment with the pure narcotic antagonist, naloxone. This naloxone-reversible component showed cross-tolerance with morphine. PCP pretreatment caused a shift to the right in the dose-response curve to acetylcholine (ACh) that was not parallel with the control dose-response curve. Thus PCP does not interact with the muscarinic cholinoceptor in a strictly atropine-like competitive fashion. Binding sites for [3H]-PCP were detected in homogenates of the guinea-pig longitudinal muscle-myenteric plexus preparation. The affinity constants and the rank order of potencies of various PCP derivatives competing with [3H]-PCP for binding suggest that these binding sites are very similar to those found in the central nervous system. These data suggest that the guinea-pig isolated ileum may be used as an in vitro system for studying the mechanism of action of phencyclidines.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D004090:Dihydromorphine / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D007422:Intestines / Q000294:innervation*; D008297:Male; D009270:Naloxone / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects*; D010622:Phencyclidine / Q000378:metabolism / Q000494:pharmacology*; D017981:Receptors, Neurotransmitter / Q000032:analysis; D017478:Receptors, Phencyclidine
chemical_list: D017981:Receptors, Neurotransmitter; D017478:Receptors, Phencyclidine; D009270:Naloxone; D004090:Dihydromorphine; D010622:Phencyclidine; D000109:Acetylcholine