A switch in the mode of the sodium/calcium exchanger underlies an age-related increase in the slow afterhyperpolarization

Scutt, Greg, Allen, Marcus, Kemenes, György and Yeoman, Mark (2015) A switch in the mode of the sodium/calcium exchanger underlies an age-related increase in the slow afterhyperpolarization. Neurobiology of aging, 36 (10). pp. 2838-2849. ISSN 1558-1497

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Abstract

During aging, the Ca(2+)-sensitive slow afterhyperpolarization (sAHP) of hippocampal neurons is known to increase in duration. This change has also been observed in the serotonergic cerebral giant cells (CGCs) of the pond snail Lymnaea stagnalis, but has yet to be characterized. In this article, we confirm that there is a reduction in firing rate, an increase in the duration of the sAHP, and an alteration in the strength and speed of spike frequency adaptation in the CGCs during aging, a finding that is compatible with an increase in the sAHP current. We go on to show that age-related changes in the kinetics of spike frequency adaptation are consistent with a reduction in Ca(2+) clearance from the cell, which we confirm with Ca(2+) imaging and pharmacological manipulation of the sodium calcium exchanger. These experiments suggest that the sodium calcium exchanger may be switching to a reverse-mode configuration in the CGCs during aging.

Item Type: Article
Keywords: Aging; Cerebral giant cells; Lymnaea stagnalis; NCX; Slow afterhyperpolarization; Sodium calcium exchanger
Schools and Departments: School of Life Sciences > Neuroscience
Subjects: Q Science
Q Science > QP Physiology
Q Science > QP Physiology > QP0351 Neurophysiology and neuropsychology
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Depositing User: George Kemenes
Date Deposited: 10 Sep 2015 11:23
Last Modified: 08 Mar 2017 06:30
URI: http://sro.sussex.ac.uk/id/eprint/56618

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Project NameSussex Project NumberFunderFunder Ref
Decision Making in Neural Networks: Influence of LearningG0189BBSRC-BIOTECHNOLOGY & BIOLOGICAL SCIENCES RESEARCH COUNCILBB/H009906/1