Ludwig-Maximilians-Universität, Chair of Metabolic Biochemistry

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Amyloid beta-peptide is produced by cultured cells during normal metabolism

Nature 359(6393): 322-5

Authors/Editors: Haass C
Schlossmacher MG
Hung AY
Vigo-Pelfrey C
Mellon A
Ostaszewski BL
Lieberburg I
Koo EH
Schenk D
Teplow DB
et al.
Publication Date: 1992
Type of Publication: Journal Article
Alzheimer's disease is characterized by the extracellular deposition in the brain and its blood vessels of insoluble aggregates of the amyloid beta-peptide (A beta), a fragment, of about 40 amino acids in length, of the integral membrane protein beta-amyloid precursor protein (beta-APP). The mechanism of extracellular accumulation of A beta in brain is unknown and no simple in vitro or in vivo model systems that produce extracellular A beta have been described. We report here the unexpected identification of the 4K (M(r) 4,000) A beta and a truncated form of A beta (approximately 3K) in media from cultures of primary cells and untransfected and beta-APP-transfected cell lines grown under normal conditions. These peptides were immunoprecipitated readily from culture medium by A beta-specific antibodies and their identities confirmed by sequencing. The concept that pathological processes are responsible for the production of A beta must not be reassessed in light of the observation that A beta is produced in soluble form in vitro and in vivo during normal cellular metabolism. Further, these findings provide the basis for using simple cell culture systems to identify drugs that block the formation or release of A beta, the primary protein constituent of the senile plaques of Alzheimer's disease.

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