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• W2217313672 endingPage "392" @default.
• W2217313672 startingPage "374" @default.
• W2217313672 abstract "The buccal ganglia of Aplysia contain a central pattern generator (CPG) that mediates rhythmic movements of the buccal apparatus during feeding. Activity in this CPG is believed to be regulated, in part, by extrinsic serotonergic inputs and by an intrinsic and extrinsic system of putative dopaminergic cells. The present study investigated the roles of dopamine (DA) and serotonin (5-HT) in regulating feeding movements of the buccal apparatus and properties of the underlying neural circuitry. Perfusing a semi-intact head preparation with DA (50 μM) or the metabolic precursor of catecholamines (l-3–4-dihydroxyphenylalanine, DOPA, 250 μM) induced feeding-like movements of the jaws and radula/odontophore. These DA-induced movements were similar to bites in intact animals. Perfusing with 5-HT (5 μM) also induced feeding-like movements, but the 5-HT-induced movements were similar to swallows. In preparations of isolated buccal ganglia, buccal motor programs (BMPs) that represented at least two different aspects of fictive feeding (i.e., ingestion and rejection) could be recorded. Bath application of DA (50 μM) increased the frequency of BMPs, in part, by increasing the number of ingestion-like BMPs. Bath application of 5-HT (5 μM) did not significantly increase the frequency of BMPs nor did it significantly increase the proportion of ingestion-like BMPs being expressed. Many of the cells and synaptic connections within the CPG appeared to be modulated by DA or 5-HT. For example, bath application of DA decreased the excitability of cells B4/5 and B34, which in turn may have contributed to the DA-induced increase in ingestion-like BMPs. In summary, bite-like movements were induced by DA in the semi-intact preparation, and neural correlates of these DA-induced effects were manifest as an increase in ingestion-like BMPs in the isolated ganglia. Swallow-like movements were induced by 5-HT in the semi-intact preparation. Neural correlates of these 5-HT-induced effects were not evident in isolated buccal ganglia, however." @default.
• W2217313672 created "2016-06-24" @default.
• W2217313672 creator A5012573934 @default.
• W2217313672 creator A5044131171 @default.
• W2217313672 creator A5084117702 @default.
• W2217313672 creator A5085312778 @default.
• W2217313672 date "2000-01-01" @default.
• W2217313672 modified "2023-10-10" @default.
• W2217313672 title "Modulation of Fictive Feeding by Dopamine and Serotonin in<i>Aplysia</i>" @default.
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• W2217313672 doi "https://doi.org/10.1152/jn.2000.83.1.374" @default.
• W2217313672 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10634881" @default.
• W2217313672 hasPublicationYear "2000" @default.
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