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Dendritic changes in the hippocampal formation of AIDS patients: a quantitative Golgi study.

Abstract：

:We have previously shown that in the hippocampal formation of patients with acquired immunodeficiency syndrome (AIDS) there is neuronal atrophy, without cell loss. Because reductions in neuronal size are suggestive of associated neuritic alterations, we decided to study the dendritic trees of the main neuronal populations in the hippocampal formation. Material was obtained in five male AIDS patients and five male controls. After Golgi impregnation, the dendritic arborizations of dentate granule and hilar basket cells, and of CA3 and CA1 pyramidal cells, were hand traced, and their segments classified, counted and measured. We found an impoverishment of the dendritic trees in all neuronal populations in the AIDS group, which was more striking in the hilus and CA3 field. Specifically, hilar neurons had fewer dendritic segments, and reduced branching density and dendritic extent; in CA3 pyramids there was a decrease in the number of terminal segments in the basal trees, and a reduction in the total number of segments, number of medium order terminals, dendritic branching density and dendritic extent in the apical trees. In CA1 pyramids, the terminals were shorter in the apical trees and the dendritic spine density decreased in the basal trees, whereas in granule cells only the dendritic spine density was reduced in AIDS patients. Subtle signs suggestive of dendritic reorganization were observed. These results point to a regional vulnerability of the hippocampal formation to HIV infection, and might contribute to explaining the occurrence of dementia, as a consequence of overall reduction in the hippocampal neuronal receptive surface.

journal_name

Acta Neuropathol

journal_title

Acta neuropathologica

authors

Sá MJ,Madeira MD,Ruela C,Volk B,Mota-Miranda A,Paula-Barbosa MM

doi

10.1007/s00401-003-0781-3

subject

Has Abstract

pub_date

2004-02-01 00:00:00

pages

97-110

issue

2

eissn

0001-6322

issn

1432-0533

journal_volume

107

pub_type

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