Caspase-cleavage of Tau is an Early Event in Alzheimer Disease Tangle Pathology

Overview

Journal J Clin Invest

Specialty General Medicine

Date 2004 Jul 3

PMID 15232619

Citations 259

Authors

Robert A Rissman

Wayne W Poon

Mathew Blurton-Jones

Salvatore Oddo

Reidun Torp

Michael P Vitek

Frank M LaFerla

Troy T Rohn

Carl W Cotman

Affiliations

Soon will be listed here.

Abstract

Neurofibrillary tangles (NFTs) are composed of abnormal aggregates of the cytoskeletal protein tau. Together with amyloid beta (Abeta) plaques and neuronal and synaptic loss, NFTs constitute the primary pathological hallmarks of Alzheimer disease (AD). Recent evidence also suggests that caspases are activated early in the progression of AD and may play a role in neuronal loss and NFT pathology. Here we demonstrate that tau is cleaved at D421 (DeltaTau) by executioner caspases. Following caspase-cleavage, DeltaTau facilitates nucleation-dependent filament formation and readily adopts a conformational change recognized by the early pathological tau marker MC1. DeltaTau can be phosphorylated by glycogen synthase kinase-3beta and subsequently recognized by the NFT antibody PHF-1. In transgenic mice and AD brains, DeltaTau associates with both early and late markers of NFTs and is correlated with cognitive decline. Additionally, DeltaTau colocalizes with Abeta(1-42) and is induced by Abeta(1-42) in vitro. Collectively, our data imply that Abeta accumulation triggers caspase activation, leading to caspase-cleavage of tau, and that this is an early event that may precede hyperphosphorylation in the evolution of AD tangle pathology. These results suggest that therapeutics aimed at inhibiting tau caspase-cleavage may prove beneficial not only in preventing NFT formation, but also in slowing cognitive decline.

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