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Abnormal cortical synaptic plasticity in a mouse model of Huntington's disease

Cummings, DM; Milnerwood, AJ; Dallerac, GM; Vatsavayai, SC; Hirst, MC; Murphy, KPSJ; (2007) Abnormal cortical synaptic plasticity in a mouse model of Huntington's disease. BRAIN RESEARCH BULLETIN , 72 (2-3) 103 - 107. 10.1016/j.brainresbull.2006.10.016.

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Abstract

Huntington's disease is a fatal neurodegenerative disorder characterised by a progressive motor, psychiatric and cognitive decline and associated with a marked loss of neurons in the cortex and striatum of affected individuals. The disease is inherited in an autosomal dominant fashion and is caused by a trinucleotide (CAG) repeat expansion in the gene encoding the protein huntingtin. Predictive genetic testing has revealed early cognitive deficits in asymptomatic gene carriers such as altered working memory, executive function and recognition memory. The perirhinal cortex is believed to process aspects of recognition memory. Evidence from primate studies suggests that decrements in neuronal firing within this cortical region encode recognition memory and that the underlying mechanism is an activity-dependent long-term depression (LTD) of excitatory neurotransmission, the converse of long-term potentiation (LTP). We have used the R6/1 mouse model of HD to assess synaptic plasticity in the perirhinal cortex. This mouse model provides an ideal tool for investigating early and progressive changes in synaptic function in HD. We report here that LTD at perirhinal synapses is markedly reduced in R6/1 mice. We also provide evidence to suggest that a reduction in dopamine D2 receptor signalling may be implicated. (c) 2006 Published by Elsevier Inc.

Type: Article
Title: Abnormal cortical synaptic plasticity in a mouse model of Huntington's disease
Location: Manchester, ENGLAND
DOI: 10.1016/j.brainresbull.2006.10.016
Keywords: LTD, LTP, EPSP, perirhinal cortex, dopamine, recognition memory, LONG-TERM DEPRESSION, TRANSGENIC MICE, PERIRHINAL CORTEX, MEMORY FUNCTION, GENE, MUTATION, CARRIERS, REPEAT, PROGRESSION, RECEPTORS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Neuro, Physiology and Pharmacology
URI: http://discovery.ucl.ac.uk/id/eprint/1333293
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