Journal
MOLECULAR NEURODEGENERATION
Volume 7, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/1750-1326-7-39
Keywords
A beta; Alzheimer's disease; APP; Therapeutics; gamma-secretase inhibition
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Funding
- National Institutes of Health/National Institute on Aging [P01AG25531]
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Background: Alzheimer's disease (AD) is the leading cause of dementia among the elderly. Disease modifying therapies targeting A beta that are in development have been proposed to be more effective if treatment was initiated prior to significant accumulation of A beta in the brain, but optimal timing of treatment initiation has not been clearly established in the clinic. We compared the efficacy of transient pharmacologic reduction of brain A beta with a gamma-secretase inhibitor (GSI) for 1-3 months (M) treatment windows in APP Tg2576 mice and subsequent aging of the mice to either 15M or 18M. Results: These data show that reducing A beta production in a 2-3M windows both initiated and discontinued before detectable A beta deposition has the most significant impact on A beta loads up to 11M after treatment discontinuation. In contrast, initiation of treatment for 3M windows from 7-10M or 12-15M shows progressively decreasing efficacy. Conclusions: These data have major implications for clinical testing of therapeutics aimed at lowering A beta production, indicating that; i) these therapies may have little efficacy unless tested as prophylactics or in the earliest preclinical stage of AD where there is no or minimal A beta accumulation and ii) lowering A beta production transiently during a critical pre-deposition window potentially provides long-lasting efficacy after discontinuation of the treatment.
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