Cell
Volume 142, Issue 3, 6 August 2010, Pages 387-397
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Article
Dendritic Function of Tau Mediates Amyloid-β Toxicity in Alzheimer's Disease Mouse Models

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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 (Δtau) and absence of tau in tau−/− mice both disrupt postsynaptic targeting of Fyn. This uncouples NR-mediated excitotoxicity and hence mitigates Aβ toxicity. Δtau 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.

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

HUMDISEASE
MOLNEURO

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These authors contributed equally to this work