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Asp664 cleavage of amyloid precursor protein induces tau phosphorylation by decreasing protein phosphatase 2A activity.

Abstract：

:Caspase cleavage of amyloid precursor protein (APP) has been reported to be important in amyloid beta protein (Aβ)-mediated neurotoxicity. However, the underlying mechanisms are not clearly understood. In this study, we explored the effect of caspase cleavage of APP on tau phosphorylation in relation to Aβ. We found that Asp664 cleavage of APP increased tau phosphorylation at Thr212 and Ser262 in N2A cells and primary cultured hippocampal neurons. Compared with wild-type APP, protein phosphatase 2A (PP2A) activity was significantly increased when Asp664 cleavage was blocked by the D664A point mutation. Furthermore, we found that over-expression of C31 reduced PP2A activity. C31 binds directly to the PP2A catalytic subunit, through the asparagine, proline, threonine, tyrosine (NPTY) motif, which is essential for C31-induced tau hyperphosphorylation. However, it appears that the other fragment produced by Asp664 cleavage, Jcasp, modulates neither PP2A activity nor tau hyperphosphorylation. Asp664 cleavage and accompanying tau hyperphosphorylation were remarkably diminished by blockage of Aβ production using a γ-secretase inhibitor. Taken together, our results suggest that Asp664 cleavage of APP leads to tau hyperphosphorylation at specific epitopes by modulating PP2A activity as a downstream of Aβ. Direct binding of C31 to PP2A through the C31-NPTY domain was identified as a mechanism underlying this effect.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Park SS,Jung HJ,Kim YJ,Park TK,Kim C,Choi H,Mook-Jung IH,Koo EH,Park SA

doi

10.1111/jnc.12032

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

856-65

issue

5

eissn

0022-3042

issn

1471-4159

journal_volume

123

pub_type

杂志文章

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