Abstract
β-Secretase (BACE1), an enzyme responsible for the production of amyloid β-peptide (Aβ), is increased by oxidative stress and is elevated in the brains of patients with sporadic Alzheimer's disease (AD). Here, we show that oxidative stress fails to induce BACE1 expression in presenilin-1 (γ-secretase)-deficient cells and in normal cells treated with γ-secretase inhibitors. Oxidative stress-induced β-secretase activity and sAPPβ levels were suppressed by γ-secretase inhibitors. Levels of γ- and β-secretase activities were greater in brain tissue samples from AD patients compared to non-demented control subjects, and the elevated BACE1 level in the brains of 3xTgAD mice was reduced by treatment with a γ-secretase inhibitor. Our findings suggest that γ-secretase mediates oxidative stress-induced expression of BACE1 resulting in excessive Aβ production in AD.
Original language | English |
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Pages (from-to) | 917-925 |
Number of pages | 9 |
Journal | Neurobiology of Aging |
Volume | 31 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2010 |
Bibliographical note
Funding Information:This research was supported by the Intramural Research Program of the National Institute on Aging, NIH, and by a Korea Research Foundation Grant to D.-G.J. (MOEHRD, Basic Research Promotion Fund) (KRF-2007-313-C00526).
Keywords
- Alzheimer's disease
- Oxidative stress
- β-Secretase
- γ-Secretase