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The effects of para-chlorophenylalanine pre-treatment (PCPA, 150 mg/kg IP daily for 3 days) on feeding and stereotyped behaviour elicited by the serotonin agonist 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) in rats were investigated. PCPA depleted brain serotonin and 5-hydroxyindoleacetic acid concentrations by 90% and increased feeding during a 2-h day-time test. 8-OH-DPAT (60-4000 micrograms/kg SC) increased food intake in control animals but decreased it in PCPA-treated animals during the 2-h test. PCPA treatment had no effect on 8-OH-DPAT-induced locomotion or serotonin-related stereotyped behaviour (i.e. forepaw treading, headweaving, wet dog shakes, etc). Since PCPA prevents the operation of pre-synaptic serotonergic mechanisms, the failure of 8-OH-DPAT to increase food intake in PCPA-treated rats suggests that 8-OH-DPAT-induced hyperphagia is autoreceptor mediated.


Journal article


Psychopharmacology (Berl)

Publication Date





467 - 471


8-Hydroxy-2-(di-n-propylamino)tetralin, Animals, Brain, Brain Chemistry, Eating, Fenclonine, Hydroxyindoleacetic Acid, Male, Naphthalenes, Rats, Rats, Inbred Strains, Receptors, Serotonin, Serotonin, Stereotyped Behavior, Tetrahydronaphthalenes