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Wnt-pathway Activation During the Early Stage of Neurodegeneration in FTDP-17 Mice

Overview
Journal Neurobiol Aging
Publisher Elsevier
Date 2007 Jul 3
PMID 17604878
Citations 11
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Abstract

Glycogen synthase kinase-3beta (GSK-3beta), a key component of the Wnt signaling pathway, has been recognized as an important tau kinase with a potential pathogenic role in dementia. We have previously shown that GSK-3beta-induced tau-hyperphosphorylation and Wnt-activation enhance tau-induced degeneration in Drosophila. Here, we demonstrate that Wnt-activation occurs prior to 3 months of age in the JNPL3 mouse model of frontotemporal dementia (FTD). We observed that GSK-3beta becomes associated with insoluble tau, concomitant with the increase in the downstream Wnt-pathway component beta-catenin. We demonstrate that this induces downstream Wnt signaling via the activation of nuclear transcription factors associated with beta-catenin, suggesting that Wnt-pathway activation is an early feature of the neurodegenerative process.

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