Abstract
A PATHOLOGICAL hallmark of Alzheimer's disease is the deposition of amyloid fibrils in the brain. The principal component of the amyloid fibril is β/A4 protein1,2, which is derived from a large membrane-bound glycoprotein, Alzheimer amyloid protein precursor (APP)3. Although the deposition of amyloid is thought to result from the aberrant processing of APP, the detailed molecular mechanisms of amyloidogenesis remain unclear. A C-terminal fragment of APP which spans the β/A4 and cytoplasmic domains has a tendency to self-aggregate4,5. In an attempt to establish a cultured-cell model for amyloid fibril formation, we have trans-fected COS-1 cells with complementary DNA encoding the C-terminal 100 residues of APP. In the perinuclear regions of a small population of DNA-transfected cells, we observed inclusion-like deposits which showed a strong immunohistochemical reaction towards an anti-C-terminal APP antibody or an anti-β/A4 amyloid core-specific antibody. Electron microscope observations of the inclusion-carrying cells revealed an accumulation of amyloid-like fibrils of 8–22 nm diameter near and on the nuclear membrane. The fibrils showed a beaded or helical structure, and reacted positively with the anti-C-terminus antibody by immunoelectron microscopy. These results suggest that the formation of amyloid fibrils is an inherent characteristic of the C-terminal peptide of APP. The present system provides a suitable model for the molecular dissection of the process of brain amyloidogenesis.
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Maruyama, K., Terakado, K., Usami, M. et al. Formation of amyloid-like fibrils in COS cells overexpressing part of the Alzheimer amyloid protein precursor. Nature 347, 566–569 (1990). https://doi.org/10.1038/347566a0
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DOI: https://doi.org/10.1038/347566a0
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