Intracellular pH regulates amyloid precursor protein intracellular domain accumulation.

Abstract:

:The amyloid precursor protein (APP) metabolism is central to pathogenesis of Alzheimer's disease (AD). Parenchymal amyloid deposits, a neuropathological hallmark of AD, are composed of amyloid-beta peptides (Abeta). Abeta derives from the amyloid precursor protein (APP) by sequential cleavages by beta- and gamma-secretases. Gamma-secretase cleavage releases the APP intracellular domain (AICD), suggested to mediate a nuclear signaling. Physiologically, AICD is seldom detected and thus supposed to be rapidly degraded. The mechanisms responsible of its degradation remain unknown. We used a pharmacological approach and showed that several alkalizing drugs induce the accumulation of AICD in neuroblastoma SY5Y cell lines stably expressing APP constructs. Moreover, alkalizing drugs induce AICD accumulation in naive SY5Y, HEK and COS cells. This accumulation is not mediated by the proteasome or metallopeptidases and is not the result of an increased gamma-secretase activity since the gamma-secretase cleavage of Notch1 and N-Cadherin is not affected by alkalizing drug treatments. Altogether, our data demonstrate for the first time that alkalizing drugs induce the accumulation of AICD, a mechanism likely mediated by the endosome/lysosome pathway.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Vingtdeux V,Hamdane M,Bégard S,Loyens A,Delacourte A,Beauvillain JC,Buée L,Marambaud P,Sergeant N

doi

10.1016/j.nbd.2006.09.019

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

686-96

issue

3

eissn

0969-9961

issn

1095-953X

pii

S0969-9961(06)00304-4

journal_volume

25

pub_type

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