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PMID: 14614143 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Spatial memory performances of aged rats in the water maze predict levels of hippocampal neurogenesis.

Drapeau E, Mayo W, Aurousseau C, Le Moal M, Piazza PV, Abrous DN

Abstract

Neurogenesis occurs within the adult dentate gyrus of the hippocampal formation and it has been proposed that the newly born neurons, recruited into the preexistent neuronal circuits, might be involved in hippocampal-dependent learning processes. Age-dependent spatial memory impairments have been related to an alteration in hippocampal plasticity. The aim of the current study was to examine whether cognitive functions in aged rats are quantitatively correlated with hippocampal neurogenesis. To this end, we took advantage of the existence of spontaneous individual differences observed in aged subjects in a hippocampal-dependent task, the water maze. We expected that the spatial memory capabilities of aged rats would be related to the levels of hippocampal neurogenesis. Old rats were trained in the water maze, and, 3 weeks after training, rats were injected with 5-bromo-2'-deoxyuridine (BrdUrd, 50 or 150 mg/kg) to label dividing cells. Cell proliferation was examined one day after the last BrdUrd injection, whereas cell survival and differentiation were determined 3 weeks later. It is shown that a quantitative relationship exists between learning and the number of newly generated neurons. Animals with preserved spatial memory, i.e., the aged-unimpaired rats, exhibited a higher level of cell proliferation and a higher number of new neurons in comparison with rats with spatial memory impairments, i.e., the aged-impaired rats. In conclusion, the extent of memory dysfunction in aged rats is quantitatively related to the hippocampal neurogenesis. These data reinforce the assumption that neurogenesis is involved in memory processes and aged-related cognitive alterations.

MeSH Terms
Aging/psychology Animals Bromodeoxyuridine/metabolism Cell Division Cell Survival Hippocampus/cytology,growth & development,physiology Male Maze Learning/physiology Memory/physiology Rats Rats, Sprague-Dawley Spatial Behavior/physiology
Chemicals
Bromodeoxyuridine
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Drapeau Elodie
Institut National de la Santá et de la Recherche Médicale Unité 588, Domaine de Carreire, Rue Camille Saint Saëns, University of Bordeaux II, 33077 Bordeaux Cedex, France.
Mayo Willy
Aurousseau Catherine
Le Moal Michel
Piazza Pier-Vincenzo
Abrous Djoher Nora
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
2003-11-25
Epub
2003-00-12
Pages
14385-90
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC283601
Subset
IM
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