Abstract:
:The amyloid precursor protein (APP) is an ubiquitous receptor-like molecule involved in the pathogenesis of Alzheimer's disease (AD). APP and some of its C-terminal proteolytic fragments (CTFs) have been shown to be phosphorylated and to interact with cytosolic phosphotyrosine binding (PTB) domain containing proteins involved in cell signaling and vesicular transport. Among others, the interaction between tyrosine-phosphorylated CTFs and ShcA-Grb2 adaptors is highly enhanced in AD brain. Here we have identified in SH-SY5Y neuroblastoma cells an interaction between APP holoprotein and the adaptor Grb2. Upon activation of apoptotic cell death this interaction is rapidly degraded, APP is partially cleaved and the complex APP/Grb2 is replaced by a new complex between CTFs and ShcA that still involves Grb2. The formation of these complexes is regulated by beta-site APP-cleaving enzyme 1 and influences the phosphorylation of mitogen-activated protein kinase p44/42 extracellular signal-regulated kinase as well as the level of apoptotic death of the cells. These data suggest a dual role in cell signaling for APP and its CTFs in neuroblastoma cells, in a manner similar to that previously reported for other tyrosine kinase receptor, through a tightly regulated coupling with alternative intracellular adaptors to control the signaling of the cell.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Venezia V,Russo C,Repetto E,Salis S,Dolcini V,Genova F,Nizzari M,Mueller U,Schettini Gdoi
10.1111/j.1471-4159.2004.02618.xkeywords:
subject
Has Abstractpub_date
2004-09-01 00:00:00pages
1359-70issue
6eissn
0022-3042issn
1471-4159pii
JNC2618journal_volume
90pub_type
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