viernes, 6 de agosto de 2010

Cell - Dendritic Function of Tau Mediates Amyloid-β Toxicity in Alzheimer's Disease Mouse Models


Dendritic Function of Tau Mediates Amyloid-β Toxicity in Alzheimer's Disease Mouse Models
Cell, Volume 142, Issue 3, 387-397, 22 July 2010
Copyright 2010 Elsevier Inc. All rights reserved.
10.1016/j.cell.2010.06.036


Referred to by: Fyn-Tau-Amyloid: A Toxic Triad

Authors
Lars M. Ittner, Yazi D. Ke, Fabien Delerue, Mian Bi, Amadeus Gladbach, Janet van Eersel, Heidrun Wölfing, Billy C. Chieng, MacDonald J. Christie, Ian A. Napier, Anne Eckert, Matthias Staufenbiel, Edna Hardeman, Jürgen GötzSee AffiliationsHint: Rollover Authors and Affiliations Alzheimer's and Parkinson's Disease Laboratory, Brain and Mind Research Institute, University of Sydney, Sydney NSW 2050, Australia Neuropharmacology Laboratory, Brain and Mind Research Institute, University of Sydney, Sydney NSW 2050, Australia Neurobiology Research Laboratory, Psychiatric University Clinic, University of Basel, Basel CH-4025, Switzerland Novartis Institutes for BioMedical Research, Basel CH-4002, Switzerland Neuromuscular and Regenerative Medicine Unit, University of New South Wales, Sydney NSW 2052, Australia Corresponding author These authors contributed equally to this work

Highlights
•Expression of truncated tau in mice reveals dendritic functions of tau
•Truncated tau prevents premature death and memory deficits in Aβ-forming APP23 mice
•Postsynaptic localization of the kinase Fyn is tau dependent
•Fyn-mediated interaction between NMDAR and PSD-95 is required for Aβ toxicity

Summary
Alzheimer's disease (AD) is characterized by amyloid-β (Aβ) and tau deposition in brain. It has emerged that Aβ toxicity is tau dependent, although mechanistically this link remains unclear. Here, we show that tau, known as axonal protein, has a dendritic function in postsynaptic targeting of the Src kinase Fyn, a substrate of which is the NMDA receptor (NR). Missorting of tau in transgenic mice expressing truncated tau (tau) and absence of tau in tau/ mice both disrupt postsynaptic targeting of Fyn. This uncouples NR-mediated excitotoxicity and hence mitigates Aβ toxicity. tau expression and tau deficiency prevent memory deficits and improve survival in Aβ-forming APP23 mice, a model of AD. These deficits are also fully rescued with a peptide that uncouples the Fyn-mediated interaction of NR and PSD-95 in vivo. Our findings suggest that this dendritic role of tau confers Aβ toxicity at the postsynapse with direct implications for pathogenesis and treatment of AD.

10.1016/j.cell.2010.06.036
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Cell - Dendritic Function of Tau Mediates Amyloid-β Toxicity in Alzheimer's Disease Mouse Models

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