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American Journal of Pathology, Vol 131, 507-518, Copyright © 1988 by American Society for Investigative Pathology

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Neocortical morphometry and cholinergic neurochemistry in Pick's disease

LA Hansen, R Deteresa, H Tobias, M Alford and RD Terry
Department of Neurosciences, University of California, San Diego, School of Medicine, La Jolla 92093.

With a computerized image-analysis apparatus for neocortical morphometry and chemical methods for evaluation of the cholinergic system, five brain specimens of Pick's disease (PD) were studied and the results compared to those from specimens of age-matched normal subjects and Alzheimer's disease (AD). The PD specimens showed major reductions in brain weight, frontal and temporal cortical thickness, and large neuron populations, compared with controls. Lesser reductions were seen in small neurons and thickness of the inferior parietal cortex. The authors found no relationship between age of onset or disease duration and either the degree of cortical thinning or neuron loss or the number of Pick bodies in the neocortex and hippocampus. PD specimens were more atrophic than AD brains, having lower brain weights and more fronto-temporal thinning. Large neurons were comparably reduced in the two conditions in the frontal and temporal lobes, but small neuron losses were greater in the PD midfrontal area. Only the AD cases showed loss of large neurons in the inferior parietal region. Levels of choline acetyltransferase were normal in PD and reduced in AD, whereas muscarinic receptor binding was decreased in both.

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