Effects of cannabinoid receptor ligands on psychosis-relevant behavior models in the rat

Marijuana is known to have psychotropic effects in humans. In this study, we used rat models of sensorimotor gating, hyperactivity and stereotypy to explore whether CB(1) receptor stimulation or blockade induces behavioral changes consistent with psychotomimetic or antipsychotic agents, respectively...

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Veröffentlicht in:Psychopharmacologia 2003, Vol.165 (2), p.128-135
Hauptverfasser: MARTIN, Renee S, SECCHI, Robert L, SUNG, Eric, LEMAIRE, Martine, BONHAUS, Douglas W, HEDLEY, Linda R, LOWE, David A
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container_end_page 135
container_issue 2
container_start_page 128
container_title Psychopharmacologia
container_volume 165
creator MARTIN, Renee S
SECCHI, Robert L
SUNG, Eric
LEMAIRE, Martine
BONHAUS, Douglas W
HEDLEY, Linda R
LOWE, David A
description Marijuana is known to have psychotropic effects in humans. In this study, we used rat models of sensorimotor gating, hyperactivity and stereotypy to explore whether CB(1) receptor stimulation or blockade induces behavioral changes consistent with psychotomimetic or antipsychotic agents, respectively. We determined whether (a) the cannabinoid agonist CP 55940 decreased pre-pulse inhibition (PPI) as might be expected from a psychotomimetic agent, and (b) the selective CB(1) receptor antagonist, SR 141716A, had any effect on PPI on its own or following disruptions by psychotomimetic agents. In addition, we investigated the effects of SR 141716A on elevated levels of hyperactivity and stereotypy elicited by d-amphetamine. These studies were conducted in rats using standard methodologies for determination of PPI following acoustic stimuli, and d-amphetamine-induced hyperactivity and stereotypies. Decreased startle responses to 120 dB stimuli were observed in rats treated with CP 55940 (0.1 mg/kg IP) in the absence and presence of a 73 dB pre-pulse. These effects were reversed by SR 141716A (5 and 10 mg/kg, respectively). SR 141716A (0.1, 5, 10 mg/kg) had no effect on PPI on its own or following disruptions by apomorphine, d-amphetamine or MK-801. Conversely, in separate experiments different antipsychotic agents reversed disruptions in PPI induced by d-amphetamine (haloperidol), apomorphine (haloperidol or clozapine) or MK-801 (clozapine or olanzapine). In addition, unlike haloperidol, SR 141716A (5 mg/kg) did not reverse d-amphetamine-mediated increases in hyperactivity or stereotypy. The CP 55940-mediated decreases in startle amplitude confound assessment of the effects of CB(1) receptor activation on PPI. The failure of SR 141716A to reverse disruptions in PPI, hyperactivity or stereotypy induced by non-cannabinoid psychotomimetic agents suggests that blockade of the CB(1) receptor on its own is not sufficient for antipsychotic therapy.
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In this study, we used rat models of sensorimotor gating, hyperactivity and stereotypy to explore whether CB(1) receptor stimulation or blockade induces behavioral changes consistent with psychotomimetic or antipsychotic agents, respectively. We determined whether (a) the cannabinoid agonist CP 55940 decreased pre-pulse inhibition (PPI) as might be expected from a psychotomimetic agent, and (b) the selective CB(1) receptor antagonist, SR 141716A, had any effect on PPI on its own or following disruptions by psychotomimetic agents. In addition, we investigated the effects of SR 141716A on elevated levels of hyperactivity and stereotypy elicited by d-amphetamine. These studies were conducted in rats using standard methodologies for determination of PPI following acoustic stimuli, and d-amphetamine-induced hyperactivity and stereotypies. 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The failure of SR 141716A to reverse disruptions in PPI, hyperactivity or stereotypy induced by non-cannabinoid psychotomimetic agents suggests that blockade of the CB(1) receptor on its own is not sufficient for antipsychotic therapy.</abstract><cop>Berlin</cop><pub>Springer</pub><pmid>12404071</pmid><doi>10.1007/s00213-002-1240-x</doi><tpages>8</tpages></addata></record>
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subjects Animals
Antipsychotic Agents - pharmacology
Apomorphine - pharmacology
Arousal - drug effects
Arousal - physiology
Attention - drug effects
Attention - physiology
Behavior, Animal - drug effects
Behavior, Animal - physiology
Biological and medical sciences
Cyclohexanols - pharmacology
Dextroamphetamine - pharmacology
Dizocilpine Maleate - pharmacology
Dose-Response Relationship, Drug
Drug addictions
Hallucinogens - pharmacology
Male
Medical sciences
Motor Activity - drug effects
Motor Activity - physiology
Piperidines - pharmacology
Psychoses, Substance-Induced - physiopathology
Psychosis
Pyrazoles - pharmacology
Rats
Rats, Wistar
Receptors, Cannabinoid
Receptors, Drug - drug effects
Receptors, Drug - physiology
Reflex, Startle - drug effects
Stereotyped Behavior - drug effects
Stereotyped Behavior - physiology
Toxicology
title Effects of cannabinoid receptor ligands on psychosis-relevant behavior models in the rat
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