title: Cannabidiol reverses MK-801-induced disruption of prepulse inhibition in mice.
abstract: Cannabidiol, a nonpsychoactive constituent of the Cannabis sativa plant, has been reported to act as an agonist of the vanilloid 1 channel in the transient receptor potential family (TRPV1) and also to inhibit the hydrolysis and cellular uptake of the endogenous cannabinoid anandamide. Cannabidiol has also been reported to have potential as an antipsychotic. We investigated the effect of cannabidiol on sensorimotor gating deficits in mice induced by the noncompetitive NMDA receptor antagonist, MK-801. Sensorimotor gating is deficient in psychotic disorders such as schizophrenia and may be reliably measured by prepulse inhibition (PPI) of the startle response in rodents and humans. MK-801 (0.3-1 mg/kg i.p.) dose dependently disrupted PPI while cannabidiol (1-15 mg/kg i.p.), when administered with vehicle, had no effect on PPI. Cannabidiol (5 mg/kg i.p.) successfully reversed disruptions in PPI induced by MK-801 (1 mg/kg i.p.), as did the atypical antipsychotic clozapine (4 mg/kg i.p.). Pretreatment with capsazepine (20 mg/kg i.p.) prevented the reversal of MK-801-induced disruption of PPI by cannabidiol, providing preliminary evidence that TRPV1 receptors are involved in the reversal of MK-801-induced sensorimotor gating deficits by cannabidiol.
authors.affiliation: Department of Pharmaceutical Biology and Pharmacology, Victorian College of Pharmacy, Monash University, Victoria, Australia. leonora.long@vcp.monash.edu.au
authors.forename: Leonora E
authors.initials: LE
authors.lastname: Long
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Malone
authors.forename: David A
authors.initials: DA
authors.lastname: Taylor
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D002185:Cannabidiol / Q000494:pharmacology*; D002211:Capsaicin / Q000031:analogs & derivatives / Q000494:pharmacology; D003024:Clozapine / Q000494:pharmacology; D003214:Conditioning, Classical / Q000187:drug effects; D016291:Dizocilpine Maleate / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology*; D007266:Inhibition, Psychological; D008297:Male; D051379:Mice; D013216:Reflex, Startle / Q000187:drug effects*; D012702:Serotonin Antagonists / Q000494:pharmacology
chemical_list: D018691:Excitatory Amino Acid Antagonists; D012702:Serotonin Antagonists; D002185:Cannabidiol; D016291:Dizocilpine Maleate; D003024:Clozapine; C071423:capsazepine; D002211:Capsaicin