Three-dimensional structures of canine senile plaques.
Acta Neuropathol
; 102(4): 321-8, 2001 Oct.
Article
em En
| MEDLINE
| ID: mdl-11603806
ABSTRACT
In this study, the three-dimensional structures of two types of canine senile plaques (SP), diffuse plaques (DP) and mature plaques (MP), were compared using a confocal laser scanning microscope. The three-dimensional observation revealed that canine DP were uneven nebula-like assemblies of amyloid-beta (Abeta), while MP were comparatively uniform assemblies of membrane-like or fibrous Abeta materials with some differences among subtypes (primitive, classic and compact). We also noticed the presence of areas with low-density Abeta deposition inside DP and MP, indicating degradation of Abeta. Double staining for Abeta and other SP constituents was also conducted. Amyloid precursor protein (APP) was mainly deposited as rough granules around Abeta assemblies in DP and both inside and around Abeta assemblies in MP. The patten of ubiquitin deposition was quite similar to that of APP. Glial fibrillary acidic protein-positive astroglial projections were found around and inside Abeta assemblies in both types of SP, but were more prominent in MP than DP. DP were often invaded by neurofilament-positive neuronal processes (neurites), while no such neurites were observed inside MP. Dystrophic neurites were, however, frequently detected around MP. These results clearly showed that canine DP and MP have completely different three-dimensional structures, consistent with different processes of DP and MP formation.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Envelhecimento
/
Placa Amiloide
/
Lobo Frontal
Limite:
Animals
Idioma:
En
Revista:
Acta Neuropathol
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Japão