Shift from fibrillar to nonfibrillar Abeta deposits in the neocortex of subjects with Alzheimer disease.
| Publication Type | Academic Article |
| Authors | Wegiel J, Bobinski M, Tarnawski M, Dziewiatkowski J, Popovitch E, Bobinski M, Lach B, Reisberg B, Miller D, De Santi S, De Leon M |
| Journal | J Alzheimers Dis |
| Volume | 3 |
| Issue | 1 |
| Pagination | 49-57 |
| Date Published | 02/01/2001 |
| ISSN | 1875-8908 |
| Abstract | A morphometric study of amyloid-beta-positive plaques in the neocortex of eight non-demented people from 68 to 82 years of age and 17 subjects with late-stage Alzheimer disease (GDS stage 7/FAST stages 7a-f) from 73 to 93 years of age shows a shift from prevalence of fibrillar plaques to prevalence of nonfibrillar plaques. In the aged, non-demented subjects, about 4/mm^2 plaques are detectable in the neocortex, and the majority are fibrillar plaques. Specifically, 64% found to be classical fibrillar and Thioflavin-S-positive bright primitive plaques. A lower percentage of pale primitive plaques (35%) relatively small proportion of plaques that are poor in thioflavin S-positive fibrils. The numerical density of plaques in the severe stage of AD increases to about 41/mm^2. Severely demented subjects appear to maintain an active process of fibrillar plaque formation. This is reflected in the presence of 3% bright primitive plaques. Severely demented subjects also manifest plaque degradation, reflected in the presence of 22% and 48% percentages of classical fibrillar plaques in non-demented subjects and in the end stage of disease suggest that once activated, the process of fibrillar plaque formation persists at a somewhat stable rate during the whole course of brain amyloidosis. |
| DOI | 10.3233/jad-2001-3108 |
| PubMed ID | 12214072 |