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Reactive hypertrophy of synaptic varicosities within the hippocampus of prion-infected mice

Record type: Article

Prion diseases are characteristically accompanied by extensive synaptic pathology that can occur during the preclinical phase of the disease and, in animal models, correlates with the first decline of hippocampus-dependent cognitive functions. This pathology is defined by abnormally shaped synapses in which the postsynaptic membrane modifies its curvature and potentially engulfs the juxtaposed presynaptic membrane. Using the intrahippocampally injected ME7 prion model, we further detailed the structural alterations of the population of ostensibly intact synaptic compartments within the hippocampus during this period of extensive synaptic loss. A disease stage-dependent increase in the average PSD (postsynaptic density) area, the average length of the active zone and the average number of synaptic vesicles indicated that the synapses that were visualized as the animal progressed to end-stage disease were undergoing hypertrophy. Similar findings in samples from AD (Alzheimer's disease) patients, aged and senile individuals, and animal models of neurodegenerative diseases suggest synaptic swelling as synaptic loss is initiated and/or compensatory reaction to counteract the synaptic loss

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Citation

Sisková, Zuzana, Sanyal, Nik K, Orban, Adam, O'Connor, Vincent and Perry, V Hugh (2010) Reactive hypertrophy of synaptic varicosities within the hippocampus of prion-infected mice Biochemical Society Transactions, 38, (2), pp. 471-475. (doi:10.1042/BST0380471). (PMID:20298205).

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Published date: April 2010

Identifiers

Local EPrints ID: 180211
URI: http://eprints.soton.ac.uk/id/eprint/180211
ISSN: 0300-5127
PURE UUID: 19ace411-a53a-469e-b2ad-69a923f367fb

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Date deposited: 06 Apr 2011 11:05
Last modified: 18 Jul 2017 12:01

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Contributors

Author: Zuzana Sisková
Author: Nik K Sanyal
Author: Adam Orban
Author: V Hugh Perry

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