title: Behavioral evidence for the rapid release of CNS serotonin by PCA and fenfluramine.
abstract: Administration of p-chloroamphetamine (PCA) (2.5-10.0 mg/kg) or fenfluramine (FF) (5.0-15.0 mg/kg) to rats induces a behavioral syndrome--consisting of tremor, rigidity, Straub tail, hindlimb abduction, lateral head weaving and reciprocal forepaw treading--which is a reflection of the activity of central serotonin-mediated synapses. The syndrome appears within 3-5 min following i.p. administration of PCA or FF, and the syndrome-inducing effects of PCA and FF are blocked by prior depletion of serotonin with p-chlorophenylalanine. By contrast, the syndrome-inducing effect of 5-methoxy-N,N-dimethyltryptamine (5-M-DMT), which directly stimulates postsynaptic serotonin receptors, is not changed by prior serotonin depletion. Catecholamine depletion with alpha-methyl-p-tyrosine produces essentially no change in the syndrome-inducing effects of PCA, FF or 5-M-DMT. These data indicate that the initial effect of PCA or FF administration is the rapid functional release of stored serotonin.
mesh_terms: D000662:Amphetamines / Q000494:pharmacology*; D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D010134:Fenclonine / Q000494:pharmacology; D005277:Fenfluramine / Q000494:pharmacology*; D008297:Male; D008781:Methyltyrosines / Q000494:pharmacology; D004130:N,N-Dimethyltryptamine / Q000494:pharmacology; D051381:Rats; D012701:Serotonin / Q000378:metabolism*; D013116:Spinal Cord / Q000187:drug effects / Q000378:metabolism*; D010133:p-Chloroamphetamine / Q000494:pharmacology*
chemical_list: D000662:Amphetamines; D008781:Methyltyrosines; D005277:Fenfluramine; D012701:Serotonin; D010133:p-Chloroamphetamine; D010134:Fenclonine; D004130:N,N-Dimethyltryptamine