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The Journal of Neuroscience, April 15, 2003, 23(8):3272
Nicastrin Is Required for Assembly of Presenilin/ -Secretase
Complexes to Mediate Notch Signaling and for Processing and Trafficking
of -Amyloid Precursor Protein in Mammals
Tong
Li1,
Guojun
Ma1, 2,
Huaibin
Cai1,
Donald L.
Price1, 2, 3, and
Philip C.
Wong1, 2
Departments of 1 Pathology, 2 Neuroscience,
and 3 Neurology, The Johns Hopkins University School of
Medicine, Baltimore, Maryland 21205
Recent studies indicate that nicastrin (NCT) and presenilins
form functional components of a multimeric -secretase complex required for the regulated intramembraneous proteolysis of Notch and -amyloid (A ) precursor protein (APP). To determine whether nicastrin is required for proteolytic processing of Notch and APP in
mammals and the role of nicastrin in presenilin/ -secretase complex
assembly, we generated nicastrin-deficient
(NCT / ) mice and derived
fibroblasts from NCT / embryos.
Nicastrin-null embryos died by embryonic day 10.5 and exhibited several
patterning defects, including abnormal somite segmentation, phenotypes
that are reminiscent of embryos lacking Notch1 or both presenilins.
Importantly, secretion of A peptides is abolished in
NCT / fibroblasts, whereas it is
reduced by ~50% in NCT+/ cells;
the failure to generate A peptides in
NCT / cells is accompanied by
destabilization of the presenilin/ -secretase complex and
accumulation of APP-C-terminal fragments. Moreover, APP
trafficking analysis in NCT /
fibroblasts revealed a significant delay in the rate of APP
reinternalization compared with that of control cells. Together, these
results establish that nicastrin is an essential component of the
multimeric -secretase complex in mammals required for both
-secretase activity and APP trafficking and suggest that nicastrin
may be a valuable therapeutic target for Alzheimer's disease.
Key words:
nicastrin knock-out mice; nicastrin-deficient
fibroblasts; presenilin/ -secretase complex; Notch signaling; APP
processing and trafficking; Alzheimer's disease
Copyright © 2003 Society for Neuroscience 0270-6474/03/2383272-06$05.00/0
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