Changes in the properties of the modulatory cerebral giant cells contribute to aging in the feeding system of Lymnaea

Patel, B.A., Arundell, M., ALLEN, MARCUS, GARD, PAUL, O'Hare, D., Parker, K. and YEOMAN, MARK (2006) Changes in the properties of the modulatory cerebral giant cells contribute to aging in the feeding system of Lymnaea Neurobiology of Aging, 27 (12). pp. 1892-1901. ISSN 0197-4580

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Abstract

This study examined whether electrophysiological changes in the endogenous properties and connectivity of the modulatory serotonergic cerebral giant cells (CGCs) contributed to the age-related changes in feeding behavior of the pond snail, Lymnaea. With increasing age there was a decrease in spontaneous CGC firing rates and decreased excitability of the CGCs to both chemosensory stimulation (0.05 M sucrose applied to the lips) and direct intracellular current injection. These changes could be accounted for by a decrease in the input resistance of the neuron and an increase in the amplitude and the duration of the after-hyperpolarization. Decreases were also seen in the % of CGC pairs that were electrically coupled causing asynchronous firing. Together these changes would tend to reduce the ability of the CGCs to gate and control the frequency of the feeding behavior. Part of the ability of the CGCs to gate and frequency control the feeding network is to provide a background level of excitation to the feeding motor neurons. Recordings from B1 and B4 motor neurons showed an age-related hyperpolarization of the resting membrane potential consistent with a deficit in CGC function. Increases were seen in the strength of the evoked CGC → B1 connection, however, this increase failed to compensate for the deficits in CGC excitability. In summary, age-related changes in the properties of the CGCs were consistent with them contributing to the age-related changes in feeding behavior seen in Lymnaea.

Item Type: Journal article
Uncontrolled Keywords: Neuronal aging; Serotonin; Feeding system; Modulation; Mollusk
Subjects: C000 Biological and Biomedical Sciences
DOI (a stable link to the resource): 10.1016/j.neurobiolaging.2005.09.041
Faculties: Faculty of Science and Engineering > School of Pharmacy and Biomolecular Sciences > Disease Process > Ageing
Faculty of Science and Engineering > School of Pharmacy and Biomolecular Sciences
Depositing User: Converis
Date Deposited: 08 Nov 2007
Last Modified: 25 Oct 2013 10:30
URI: http://eprints.brighton.ac.uk/id/eprint/2555

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