Spatial memory deficits following stimulation of hippocampal 5-HT1B receptors in the rat.
In this study we examined a possible contribution of serotonin (5-hydroxytryptamine, 5-HT) to spatial memory performance in the rat. Rats were trained to run in a radial maze in a manner that involved two kinds of memory function, i.e. working memory and reference memory. They received intrahippocampal microinjections of a 5-HT1A [8-hydroxy-2-(di-n-propylamino)tetralin or 8-OH-DPAT], or a 5-HT1B [3-(1,2,5,6-tetrahydropyrid-4-yl)pyrrolo[3,2-b]pyrid-5-one or CP-93,129] receptor agonist, and a muscarinic receptor antagonist (scopolamine). 8-OH-DPAT (5 micrograms/microliters), like injections of saline, induced no change in performance levels. In contrast, rats suffered an impairment in both reference and working memory following injection of scopolamine (10 micrograms/microliters). CP-93,129 induced a higher frequency of reference memory errors than of working memory errors at the intermediate (10 micrograms/microliters) and higher doses (16 micrograms/microliters). Thus, the stimulation of 5-HT1B receptors in the CA1 field of the dorsal hippocampus impairs the performance of rats in a spatial learning task.
Buhot
M C
MC
Centre National de la Recherche Scientifique, Laboratoire de Neurosciences Comportementales et Cognitives, C.N.R.S. URA 339, Université de Bordeaux I, Talence, France.
Patra
S K
SK
Naïli
S
S
D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000008:administration & dosage / Q000494:pharmacology; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D006234:Handling, Psychological; D006624:Hippocampus / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism*; D007267:Injections; D008297:Male; D018782:Maze Learning / Q000187:drug effects; D008569:Memory Disorders / Q000139:chemically induced / Q000517:prevention & control*; D008570:Memory, Short-Term / Q000187:drug effects; D018727:Muscarinic Antagonists / Q000008:administration & dosage / Q000494:pharmacology; D011725:Pyridines / Q000008:administration & dosage / Q000494:pharmacology; D011758:Pyrroles / Q000008:administration & dosage / Q000494:pharmacology; D051381:Rats; D011985:Receptors, Serotonin / Q000187:drug effects / Q000502:physiology*; D012601:Scopolamine / Q000008:administration & dosage / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*; D013028:Space Perception / Q000502:physiology*
D018727:Muscarinic Antagonists; D011725:Pyridines; D011758:Pyrroles; D011985:Receptors, Serotonin; D017366:Serotonin Receptor Agonists; C065046:3-(1,2,5,6-tetrahydropyrid-4-yl)pyrrolo(3,2-b)pyrid-5-one; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D012601:Scopolamine