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Amyloid beta peptide (A beta P), a major component of Alzheimer's disease plaques, is toxic to rat pheochromocytoma PC12 cells and to rat cortical neurons. A reduction in cell survival could be detected after 24 h incubation with 0.01 to 20 microM of the 25-35 peptide fragment (beta 25-35) of A beta P. To study the mechanism of cell death induced by A beta P, the morphological as well as the biochemical features of neuronal cell death were analyzed. To distinguish between necrosis and apoptosis, PC12 cell death caused by beta 25-35 was compared to that induced by serum deprivation, a process known to be apoptotic in these cells. The DNA-degradation pattern of A beta P treated cells appeared random rather than at distinct internucleosomal sites as with apoptosis. Electron microscopic studies of NGF-treated PC12 cells and cortical primary cultures exposed to 20 microM beta 25-35 revealed immediate cellular damage such as vacuolization of the cytoplasm, breakdown of Golgi-apparatus and other membrane systems, and neurite disintegration. This was followed by total collapse of the cytoplasm and cell lysis. These data show that A beta P toxicity occurs via a necrotic rather than an apoptotic pathway.

Type

Journal article

Journal

Brain Res

Publication Date

09/05/1994

Volume

645

Pages

253 - 264

Keywords

Amyloid beta-Peptides, Animals, Apoptosis, Cell Death, DNA Damage, Flow Cytometry, Microscopy, Electron, Necrosis, Nerve Growth Factors, PC12 Cells, Rats