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• W2023484989 abstract "Patients suffering from dementia of Alzheimer's type express less serotonin 4 receptors (5-HTR(4)), but whether an absence of these receptors modifies learning and memory is unexplored. In the spatial version of the Morris water maze, we show that 5-HTR(4) knock-out (KO) and wild-type (WT) mice performed similarly for spatial learning, short- and long-term retention. Since 5-HTR(4) control mnesic abilities, we tested whether cholinergic system had circumvented the absence of 5-HTR(4). Inactivating muscarinic receptor with scopolamine, at an ineffective dose (0.8 mg/kg) to alter memory in WT mice, decreased long-term but not short-term memory of 5-HTR(4) KO mice. Other changes included decreases in the activity of choline acetyltransferase (ChAT), the required enzyme for acetylcholine synthesis, in the septum and the dorsal hippocampus in 5-HTR(4) KO under baseline conditions. Training- and scopolamine-induced increase and decrease, respectively in ChAT activity in the septum in WT mice were not detected in the 5-HTR(4) KO animals. Findings suggest that adaptive changes in cholinergic systems may circumvent the absence of 5-HTR(4) to maintain long-term memory under baseline conditions. In contrast, despite adaptive mechanisms, the absence of 5-HTR(4) aggravates scopolamine-induced memory impairments. The mechanisms whereby 5-HTR(4) mediate a tonic influence on ChAT activity and muscarinic receptors remain to be determined." @default.
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• W2023484989 date "2010-03-04" @default.
• W2023484989 modified "2023-10-18" @default.
• W2023484989 title "Hyperfunction of Muscarinic Receptor Maintains Long-Term Memory in 5-HT4 Receptor Knock-Out Mice" @default.
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• W2023484989 doi "https://doi.org/10.1371/journal.pone.0009529" @default.
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