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• W2034893190 abstract "We have utilised laser confocal microscopy to categorise beta-amyloid plaque types that are associated with preclinical and end-stage Alzheimer's disease and to define the neurochemistry of dystrophic neurites associated with various forms of plaques. Plaques with a spherical profile were defined as either diffuse, fibrillar or dense-cored using Thioflavin S staining or immunolabelling for beta-amyloid. Confocal analysis demonstrated that fibrillar plaques had a central mass of beta-amyloid with compact spoke-like extensions leading to a confluent outer rim. Dense-cored plaques had a compacted central mass surrounded by an outer sphere of beta-amyloid. Diffuse plaques lacked a morphologically identifiable substructure, resembling a ball of homogeneous labelling. The relative proportion of diffuse, fibrillar and dense-cored plaques was 53, 22 and 25% in preclinical and 31, 49 and 20% in end-stage Alzheimer's disease cases, respectively. Plaque-associated dystrophic neurites in preclinical cases were immunolabeled for neurofilament proteins whereas, in end-stage cases, these abnormal neurites were variably labelled for tau and/or neurofilaments. Double labelling demonstrated that the proportion of diffuse, fibrillar and dense-cored plaques that were neuritic was 12, 47 and 82% and 24, 82 and 76% in preclinical and end-stage cases, respectively. Most dystrophic neurites in Alzheimer's disease cases were labelled for either neurofilaments or tau, however, confocal analysis determined that 30% of neurofilament-labelled bulb-like or elongated neurites had a core of tau immunoreactivity. These results indicate that all morphologically defined beta-amyloid plaque variants were present in both early and late stages of Alzheimer's disease. However, progression to clinical dementia was associated with both a shift to a higher proportion of fibrillar plaques that induced local neuritic alterations and a transformation of cytoskeletal proteins within associated abnormal neuronal processes. There data indicate key pathological changes that may be subject to therapeutic intervention to slow the progression of Alzheimer's disease." @default.
• W2034893190 created "2016-06-24" @default.
• W2034893190 creator A5028848778 @default.
• W2034893190 creator A5090647382 @default.
• W2034893190 date "2001-07-01" @default.
• W2034893190 modified "2023-09-26" @default.
• W2034893190 title "The morphological phenotype of β-amyloid plaques and associated neuritic changes in Alzheimer’s disease" @default.
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• W2034893190 doi "https://doi.org/10.1016/s0306-4522(01)00169-5" @default.
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