NR AFDG
AU Harper,J.D.; Lansbury,P.T.Jr.
TI Models of amyloid seeding in Alzheimer's disease and scrapie: mechanistic truths and physiological consequences of the time-dependent solubility of amyloid proteins.
QU Annual Review of Biochemistry 1997; 66: 385-407
PT journal article; review; review, tutorial
AB Ordered protein aggregation in the brain is a hallmark of Alzheimer's disease and scrapie. The disease-specific amyloid fibrils comprise primarily a single protein, amyloid beta, in Alzheimer's disease, and the prion protein in scrapie. These proteins can be induced to form aggregates in vitro that are indistinguishable from brain-derived fibrils. Consequently, much effort has been invested in the development of in vitro model systems to study the details of the aggregation processes and the effects of endogenous molecules that have been implicated in disease. Selected studies of this type are reviewed herein. A simple mechanistic model has emerged for both processes that involves a nucleation-dependent polymerization. This mechanism dictates that aggregation is dependent on protein concentration and time. Furthermore, amyloid formation can be seeded by a preformed fibril. The physiological consequences of this mechanism are discussed.
ZR 97
MH Alzheimer Disease/*pathology; Amino Acid Sequence; Amyloid/chemistry/*metabolism; Animal; Brain/pathology; Human; Molecular Sequence Data; Scrapie/*pathology; Solubility; Time Factors
AD Department of Chemistry, Massachusetts Institute of Technology, Cambridge 02139, USA
SP englisch
PO USA