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Title: The Swedish APP mutation alters the effect of genetically reduced BACE1 expression on the APP processing
Authors: Rabe, Sabine
Reichwald, Julia
Ammaturo, Domenico
De Strooper, Bart
Saftig, Paul
Neumann, Ulf
Staufenbiel, Matthias # ×
Issue Date: Oct-2011
Publisher: Raven Press
Series Title: Journal of Neurochemistry vol:119 issue:1 pages:231-9
Article number: 10.1111/j.1471-4159.2011.07412.x
Abstract: Inhibition of β-secretase (BACE1) is a key therapeutic approach in Alzheimer's disease (AD), as BACE1 initiates amyloid-β (Aβ) cleavage from the β-amyloid precursor protein (APP). As Aβ reductions in mice lacking one BACE1 allele diverged considerably between studies we investigated the effect of BACE1 knock-out in more detail. With both BACE1 alleles the Swedish mutation (APP23 mice) increased APP processing and shifted it towards the β-secretase pathway as compared with non-mutated APP expressed at a similar level (APP51/16 mice). This effect was much smaller then observed in cell culture. An about 50% decrease in BACE1 enzyme activity resulted in a sub-proportional Aβ reduction with the Swedish mutation (-20%) and even less for non-mutated APP (-16%). In wild-type mice, the Aβ reduction may be even further diminished. Other metabolites of the β-secretase pathway decreased accordingly while the alternative α-secretase pathway increased. Complete BACE1 deletion strongly enhanced these changes. The remaining Aβ signal also described by others can be explained by assay cross-reactivity with other APP metabolites supporting BACE1 as the major β-secretase. Our data indicate that BACE1 is in excess over APP at the cleavage site(s). Alterations in APP expression or substrate properties, therefore, quantitatively change its cleavage and Aβ generation.
URI: 
ISSN: 0022-3042
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Human Genetics - miscellaneous
× corresponding author
# (joint) last author

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