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Hippocampal neuron and synaptophysin-positive bouton number in aging C57BL/6 mice.

Abstract：

:A loss of hippocampal neurons and synapses had been considered a hallmark of normal aging and, furthermore, to be a substrate of age-related learning and memory deficits. Recent stereological studies in humans have shown that only a relatively minor neuron loss occurs with aging and that this loss is restricted to specific brain regions, including hippocampal subregions. Here, we investigate these age-related changes in C57BL/6J mice, one of the most commonly used laboratory mouse strains. Twenty-five mice (groups at 2, 14, and 28-31 months of age) were assessed for Morris water-maze performance, and modern stereological techniques were used to estimate total neuron and synaptophysin-positive bouton number in hippocampal subregions at the light microscopic level. Results revealed that performance in the water maze was largely maintained with aging. No age-related decline was observed in number of dentate gyrus granule cells or CA1 pyramidal cells. In addition, no age-related change in number of synaptophysin-positive boutons was observed in the molecular layer of the dentate gyrus or CA1 region of hippocampus. We observed a significant correlation between dentate gyrus synaptophysin-positive bouton number and water-maze performance. These results demonstrate that C57BL/6J mice do not exhibit major age-related deficits in spatial learning or hippocampal structure, providing a baseline for further study of mouse brain aging.

journal_name

Neurobiol Aging

journal_title

Neurobiology of aging

authors

Calhoun ME,Kurth D,Phinney AL,Long JM,Hengemihle J,Mouton PR,Ingram DK,Jucker M

doi

10.1016/s0197-4580(98)00098-0

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

599-606

issue

6

eissn

0197-4580

issn

1558-1497

pii

S0197458098000980

journal_volume

19

pub_type

杂志文章

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