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American Journal of Pathology, Vol 148, 1257-1266, Copyright © 1996 by American Society for Investigative Pathology
REGULAR ARTICLES |
DM Mann, T Iwatsubo, Y Ihara, NJ Cairns, PL Lantos, N Bogdanovic, L Lannfelt, B Winblad, ML Maat-Schieman and MN Rossor
Department of Pathological Sciences, University of Manchester, United Kingdom.
Amyloid (A beta) deposition was investigated in cases of Alzheimer's disease and hereditary cerebral hemorrhage with amyloidosis, Dutch type, due to mutations in the amyloid precursor protein (APP) gene using the end-specific monoclonal antibodies BA27 and BC05 that recognize A beta 40 or A beta 42(43), respectively. In cases of APP717 mutation the predominant A beta species within plaques terminate at A beta 42(43) with relatively little A beta 40 being present. The total amount of A beta deposited as A beta 42(43) is significantly greater than in sporadic Alzheimer's disease, consistent with the suggestion that this mutation might influence the processing of APP so as to produce more of the highly aggregatable form, A beta 1-42. In cases of APP670/671 mutation the major peptide in plaques is also A beta 42(43), although the proportion of plaques containing A beta 40, and the total A beta load is similar to that in sporadic Alzheimer's disease. As in sporadic Alzheimer's disease, the vascular amyloid in APP670/671 and APP717 and in cases of hereditary cerebral hemorrhage with amyloidosis, Dutch type is predominantly A beta 40 in this latter disorder, however, parenchymal deposits are exclusively A beta 42(43). Although the various APP mutations may influence the type, quantity, and location of A beta deposited, the predominant, and possibly the initial, species deposited in the brain parenchyma is A beta 42(43).
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