N-acetylcholinesterase-induced apoptosis in alzheimer's disease

Debra Toiber, Amit Berson, David Greenberg, Naomi Melamed-Book, Sophia Diamant, Hermona Soreq

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

Background: Alzheimer's disease (AD) involves loss of cholinergic neurons and Tau protein hyper-phosphorylation. Here, we report that overexpression of an N-terminally extended "synaptic" acetylcholinesterase variant, N-AchE-S is causally involved in both these phenomena. Methodology and Principal Findings: In transfected primary brain cultures, N-AChE-5 induced cell death, morphological impairments and caspase 3 activation. Rapid internalization of fluorescently labeled fasciculin-2 to N-AChE-5 transfected cells indicated membranal localization. In cultured cell lines, N-AChE-5 transfection activated the Tau kinase GSK3, induced Tau hyper-phosphorylation and caused apoptosis. N-AChE-S-induced cell death was suppressible by inhibiting GSK3 or caspases, by enforced overexpression of the anti-apoptotic Bcl2 proteins, or by AchE inhibition or silencing. Moreover, inherent N-AchE-5 was upregulated by stressors inducing protein misfolding and calcium imbalances, both characteristic of AD; and in cortical tissues from AD patients, N-AChE-S overexpression coincides with Tau hyper-phosphorylation. Conclusions: Together, these findings attribute an apoptogenic role to N-AChE-S and outline a potential value to AChE inhibitor therapeutics in early AD.

Original languageEnglish
Article numbere3108
JournalPLoS ONE
Volume3
Issue number9
DOIs
StatePublished - 1 Sep 2008
Externally publishedYes

ASJC Scopus subject areas

  • General

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