Abstract
The muscarinic acetylcholine receptor antagonist scopolamine significantly increased the number of errors (attempts to pass through two incorrect panels of the three panel-gates at four choice points) in the working memory task with a three-panel runway setup, when injected bilaterally at 3.2 μg/side into the dorsal hippocampus. Concurrent infusion of the selective and potent 5-hydroxytryptamine 3 (5-HT 3) receptor antagonist Y-25130 (0.32 and 1.0 μg/side) significantly attenuated the increase in working memory errors induced by intrahippocampal 3.2 μg/side scopolamine. Intrahippocampal Y-25130 (1.0 μg/side) by itself did not affect working memory errors. On the other hand, intrahippocampal administration of the competitive NMDA receptor antagonist (±)-3-(2-carboxypiperazin-4-yl)propyl-1-phosphonic acid (CPP) at 32 ng/side caused a significant increase in the number of working memory errors. However, Y-25130 at 1.0 μg/side did not affect the increase in working memory errors when infused intrahippocampally together with 32 ng/side CPP. These results suggest that antagonism of hippocampal 5-HT 3 receptors is ineffective against working memory failure resulting from blockade of NMDA receptor-mediated neurotransmission, but that it can compensate deficiency of septohippocampal cholinergic activity involved in working memory function of rats.
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