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Synapse-specific changes in serotonin signalling contribute to age-related changes in the feeding behaviour of the pond snail, Lymnaea

Yeoman, Mark S., Patel, Bhavik A., Arundell, Martin, Parker, Kim and O'Hare, Danny (2008) Synapse-specific changes in serotonin signalling contribute to age-related changes in the feeding behaviour of the pond snail, Lymnaea Journal of Neurochemistry, 106, (4) (doi:10.1111/j.1471-4159.2008.05528.x).

Record type: Article

Abstract

This study utilised the pond snail, Lymnaea to examine the contribution that alterations in serotonergic signalling make to age-related changes in feeding. Age-related decreases in 5-HIAA levels in feeding ganglia were positively correlated with a decrease in the number of sucrose-evoked bites and negatively correlated with an increase in inter-bite interval, implicating alterations in serotonergic signalling in the aged phenotype. Analysis of the serotonergic cerebral giant cell (CGC) input to the protraction motor neurone (B1) demonstrated that fluoxetine (10–100 nM) increased the amplitude/duration of the evoked EPSP in both young and middle aged but not in old neurones, suggesting an age-related attenuation of the serotonin transporter. 5-HT evoked a concentration-dependent increase in the amplitude/duration of B1 EPSP, which was greater in old neurones compared to both young and middle aged. Conversely, the 5-HT-evoked depolarisation and conditional bursting of the swallow motor neurone (B4) were attenuated in old neurones, functions critical for a full feeding rhythm. The CGCs' ability to excite B1 was blocked by cinanserin but not by methysergide. Conversely, the CGC to B4 connection was completely blocked by methysergide and only partially by cinanserin suggesting that age-related changes may be receptor-specific. In summary, synapse-specific attenuation of the CGC-B4 connection and enhancement of the CGC-B1 connection would slow the swallow phase and maintain protraction, consistent with behavioural observations

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More information

Published date: 2008
Keywords: feeding, Lymnaea, neuronal ageing, serotonin transporter

Identifiers

Local EPrints ID: 155803
URI: http://eprints.soton.ac.uk/id/eprint/155803
ISSN: 0022-3042
PURE UUID: a0b7b7e8-4d2d-42b8-88e9-5712d8b70a18

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Date deposited: 28 May 2010 14:19
Last modified: 18 Jul 2017 12:44

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Contributors

Author: Mark S. Yeoman
Author: Bhavik A. Patel
Author: Martin Arundell
Author: Kim Parker
Author: Danny O'Hare

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