Comparison of the electrocortical changes induced by (+)-amphetamine and chlorpromazine when perfused directly into the dorsal raphé nucleus of the cat.
1 (+)-Amphetamine mimicked the intermittent and sustained electrocortical desynchronization produced by (-)-noradrenaline (NA) when perfused directly into the dorsal raphé nucleus of cat encéphale isolé preparations. 2 The effects of amphetamine or NA were abolished or significantly attenuated by prior application of (-)-propranolol. 3 The effect of amphetamine, but not that of NA, was blocked by prior applications of guanethidine or chlorpromazine (CPZ). 4 Desmethylimipramine (DMI) produced dose-related changes in electrocortical activity which were similar to those induced by NA when applied to the same sites within the dorsal raphé nucleus. 5 DMI potentiated the effects of both amphetamine and NA, but guanethidine only abolished the DMI-induced potentiation of the amphetamine response. 6 (-)-Propranolol, guanethidine and CPA produced a short period of electrocortical desynchronization at the beginning of the perfusion period before antagonism of the amphetamine response was apparent. 7 The results suggest that CPZ and amphetamine have an action within the dorsal raphé nucleus possibly related to noradrenergic terminals.
D000818:Animals; D002415:Cats; D002746:Chlorpromazine / Q000008:administration & dosage / Q000494:pharmacology*; D003655:Decerebrate State; D003891:Desipramine / Q000494:pharmacology; D003913:Dextroamphetamine / Q000008:administration & dosage / Q000494:pharmacology*; D004347:Drug Interactions; D004569:Electroencephalography; D006145:Guanethidine / Q000494:pharmacology; D009638:Norepinephrine / Q000494:pharmacology; D010477:Perfusion; D011903:Raphe Nuclei
D003891:Desipramine; D003913:Dextroamphetamine; D002746:Chlorpromazine; D009638:Norepinephrine; D006145:Guanethidine