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Amyloid beta protein restores hippocampal long term potentiation: a central role for cholesterol?

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Author(s): Alexei R. Koudinov | Natalia V. Koudinova

Journal: Neurobiology of Lipids
ISSN 1683-5506

Volume: 1;
Start page: 46;
Date: 2003;
Original page

Keywords: Alzheimer's disease | amyloid precursor protein | APP | Down syndrome | etiology | lipids | learning | memory | long-term potentiation | LTP | LRP | neurodegeneration | oxidative stress | anti oxidation | PHF | NFT | tau | plaques | phospholipids | secretase | synapse | synaptic plasticity | SREBP | statins | Liver X LXR | sensor | presenilin

ABSTRACT
There is no understanding of the role of amyloid beta protein (Ab or Abeta) in brain function and Alzheimer's disease. In the present study we attempted to dissect out the role for Abeta in the synaptic plasticity in adult rat ex vivo hippocampal slices. The prolonged incubation of slices in our experimental setting preserved basic synaptic physiology but abrogated tetanus induced long term potentiation (LTP). Peptide Abeta1-40 rescued LTP while cholesterol synthesis inhibition abolished the restorative action of the peptide. Our observation confirms that Abeta protein is a functional player in cholesterol neurochemical pathways and in synaptic structure-functional plasticity. The finding also supports our proposed hypothesis that the change in Abeta biochemistry in Alzheimer's disease is a functional phenomenon aiming to compensate impaired cholesterol dynamics and associated neurotransmission and synaptic plasticity failure.

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