Harvard University

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Biochemistry of amyloid β-protein and amyloid deposits in Alzheimer disease.

Colin L Masters; Dennis J Selkoe (Profiled Authors: Selkoe, Dennis J; Masters, Colin L)

The Mental Health Research Institute, The University of Melbourne, Parkville 3010, Australia. c.masters@unimelb.edu.au
Cold Spring Harbor perspectives in medicine 2012;2(6):a006262.

Progressive cerebral deposition of the amyloid β-protein (Aβ) in brain regions serving memory and cognition is an invariant and defining feature of Alzheimer disease. A highly similar but less robust process accompanies brain aging in many nondemented humans, lower primates, and some other mammals. The discovery of Aβ as the subunit of the amyloid fibrils in meningocerebral blood vessels and parenchymal plaques has led to innumerable studies of its biochemistry and potential cytotoxic properties. Here we will review the discovery of Aβ, numerous aspects of its complex biochemistry, and current attempts to understand how a range of Aβ assemblies, including soluble oligomers and insoluble fibrils, may precipitate and promote neuronal and glial alterations that underlie the development of dementia. Although the role of Aβ as a key molecular factor in the etiology of Alzheimer disease remains controversial, clinical trials of amyloid-lowering agents, reviewed elsewhere in this book, are poised to resolve the question of its pathogenic primacy.

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