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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
In vivo reversal of amyloid-beta lesions in rat brain.
Journal of Neuropathology and Experimental Neurology 2000 January
Cerebral amyloid-beta (Abeta) deposition is central to the neuropathological definition of Alzheimer disease (AD) with Abeta related toxicity being linked to its beta-sheet conformation and/or aggregation. We show that a beta-sheet breaker peptide (iAbeta5) dose-dependently and reproducibly induced in vivo disassembly of fibrillar amyloid deposits, with control peptides having no effect. The iAbeta5-induced disassembly prevented and/or reversed neuronal shrinkage caused by Abeta and reduced the extent of interleukin-1beta positive microglia-like cells that surround the Abeta deposits. These findings suggest that beta-sheet breakers, such as iAbeta5 or similar peptidomimetic compounds, may be useful for reducing the size and/or number of cerebral amyloid plaques in AD, and subsequently diminishing Abeta-related histopathology.
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