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Fluoxetine restores spatial learning but not accelerated forgetting in mesial temporal lobe epilepsy

Record type: Article

Learning and memory dysfunction is the most common neuropsychological effect of mesial temporal lobe epilepsy, and because the underlying neurobiology is poorly understood, there are no pharmacological strategies to help restore memory function in these patients. We have demonstrated impairments in the acquisition of an allocentric spatial task, in patients with unilateral hippocampal sclerosis. We also show that patients have accelerated forgetting of the learned spatial task and that this is associated with damage to the non-dominant hippocampal formation. We go on to show a very similar pattern of chronic allocentric learning and accelerated forgetting in a status epilepticus model of mesial temporal lobe epilepsy in rats, which is associated with reduced and abnormal hippocampal neurogenesis. Finally, we show that reversal of the neurogenic deficit using fluoxetine is associated with reversal of the learning deficit but not the accelerated forgetting, pointing to a possible dissociation in the underlying mechanisms, as well as a potential therapeutic strategy for improving hippocampal-dependent learning in patients with mesial temporal lobe epilepsy.

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Citation

Barkas, Lisa, Redhead, Edward, Taylor, Matthew, Shtaya, Anan, Hamilton, Derek A. and Gray, William P. (2012) Fluoxetine restores spatial learning but not accelerated forgetting in mesial temporal lobe epilepsy Brain, 135, (8), pp. 2358-2374. (doi:10.1093/brain/aws176). (PMID:22843410).

More information

Published date: August 2012
Keywords: epilepsy, epilepsy memory impairment, neurogenesis, mesial temporal sclerosis, spatial memory
Organisations: Primary Care & Population Sciences, Cognition

Identifiers

Local EPrints ID: 339774
URI: http://eprints.soton.ac.uk/id/eprint/339774
ISSN: 0006-8950
PURE UUID: b6e37c0b-8855-4ade-82b7-add957f9c03a

Catalogue record

Date deposited: 30 May 2012 13:14
Last modified: 18 Jul 2017 05:52

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Contributors

Author: Lisa Barkas
Author: Edward Redhead
Author: Matthew Taylor
Author: Anan Shtaya
Author: Derek A. Hamilton
Author: William P. Gray

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