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Region- and age-dependent reductions of hippocampal long-term potentiation and NMDA to AMPA ratio in a genetic model of Alzheimer's disease.

Abstract：

:To characterize the mechanisms underlying region- and age-dependent hippocampal synaptic dysfunction in Alzheimer's disease, we used transgenic CRND8 mice, expressing the Swedish-Indiana APP mutation. In 2-month-old mice, no β-amyloid plaques deposition, but the presence of soluble oligomers, were found in CA1 area but not in dentate gyrus (DG). At this age, long-term potentiation (LTP) was reduced selectively in CA1. In 6-month-old mice, the presence of soluble oligomers was accompanied by accumulation of β-amyloid plaques and decreased LTP in CA1 and DG regions. In both regions, the loss of LTP was linked to reduced N-methyl-D-aspartate (NMDA) to alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) current ratio. The acetylcholine-esterase inhibitor, neostigmine rescued LTP in CA1 area at early stage of the disease but not after plaques deposition. Conversely, the NMDA receptor antagonist memantine restored LTP selectively in DG at later stages of the disease. Both these effects were associated with a normalization of the NMDA to AMPA ratio. The association between the recovery of LTP and the normalization of the NMDA to AMPA ratio provides information on new possible therapeutic strategies in Alzheimer's disease.

journal_name

Neurobiol Aging

journal_title

Neurobiology of aging

authors

Tozzi A,Sclip A,Tantucci M,de Iure A,Ghiglieri V,Costa C,Di Filippo M,Borsello T,Calabresi P

doi

10.1016/j.neurobiolaging.2014.07.002

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

123-33

issue

1

eissn

0197-4580

issn

1558-1497

pii

S0197-4580(14)00471-0

journal_volume

36

pub_type

杂志文章

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