Development of Senile Plaques. Relationships of Neuronal Abnormalities and Amyloid Deposits

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 1990 Dec 1

PMID 1701963

Citations 39

Authors

L C Cork

C Masters

K Beyreuther

D L Price

Affiliations

Soon will be listed here.

Abstract

The evolution of senile plaques and the relationships among neuritic elements, extracellular deposits of the beta-amyloid protein (beta/A4), and vascular beta/A4 are poorly understood. Immunocytochemical methods were used to examine fixed-frozen prefrontal cortices of 14 rhesus monkeys (Macaca mulatta) (14 to 37 years of age) for the presence of abnormal fibers/neurites, alpha 1-antichymotrypsin (alpha-ACT), and beta/A4. Age-associated alterations included abnormal fibers/neurites, presence of beta/A4, and association of alpha-ACT with beta/A4 in plaques and blood vessels. Vascular amyloid was present only in the oldest monkeys. The topographic distribution of abnormal fibers/neurites was mapped with acetylcholinesterase (AChE) histochemistry, and deposits of amyloid were visualized with immunocytochemistry for beta/A4. beta/A4 often was associated with neurites, but many neurites lacked demonstrable beta/A4. Thus in aged monkeys, abnormal neurites may provide one type of focus for the accumulation of the amyloid precursor, which is subsequently abnormally processed to form beta/A4. Our data in rhesus monkeys suggest that fiber and neuritic abnormalities increase with age and that they may precede the majority of beta/A4 deposits; the initial stages of neurite formation and parenchymal amyloid deposits may be independent of the appearance of vascular amyloid; and these processes may be synergistic with advanced age.

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