Alzheimer's disease Aß assemblies mediating rapid disruption of synaptic plasticity and memory.
Item Type:Journal Article
Citation:Klyubin I, Cullen WK, Hu NW, Rowan MJ, Alzheimer's disease Aß assemblies mediating rapid disruption of synaptic plasticity and memory., Molecular brain, 5, 2012, 25
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Alzheimer’s disease (AD) is characterized by episodic memory impairment that often precedes clinical diagnosis by many years. Probing the mechanisms of such impairment may provide much needed means of diagnosis and therapeutic intervention at an early, pre-dementia, stage. Prior to the onset of significant neurodegeneration, the structural and functional integrity of synapses in mnemonic circuitry is severely compromised in the presence of amyloidosis. This review examines recent evidence evaluating the role of amyloid-ß protein (Aβ) in causing rapid disruption of synaptic plasticity and memory impairment. We evaluate the relative importance of different sizes and conformations of Aβ, including monomer, oligomer, protofibril and fibril. We pay particular attention to recent controversies over the relevance to the pathophysiology of AD of different water soluble Aβ aggregates and the importance of cellular prion protein in mediating their effects. Current data are consistent with the view that both low-n oligomers and larger soluble assemblies present in AD brain, some of them via a direct interaction with cellular prion protein, cause synaptic memory failure. At the two extremes of aggregation, monomers and fibrils appear to act in vivo both as sources and sinks of certain metastable conformations of soluble aggregates that powerfully disrupt synaptic plasticity. The same principle appears to apply to other synaptotoxic amyloidogenic proteins including tau, α-synuclein and prion protein.
European Union Framework Programme 7 (FP7)
Science Foundation Ireland (SFI)
Health Research Board (HRB)
Author: ROWAN, MICHAEL
Type of material:Journal Article
Series/Report no:Molecular brain
Availability:Full text available