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A natural form of learning can increase and decrease the survival of new neurons in the dentate gyrus

A natural form of learning can increase and decrease the survival of new neurons in the dentate... Granule cells born in the adult dentate gyrus undergo a 4‐week developmental period characterized by high susceptibility to cell death. Two forms of hippocampus‐dependent learning have been shown to rescue many of the new neurons during this critical period. Here, we show that a natural form of associative learning, social transmission of food preference (STFP), can either increase or decrease the survival of young granule cells in adult rats. Increased numbers of pyknotic as well as phospho‐Akt‐expressing BrdU‐labeled cells were seen 1 day after STFP training, indicating that training rapidly induces both cell death and active suppression of cell death in different subsets. A single day of training for STFP increased the survival of 8‐day‐old BrdU‐labeled cells when examined 1 week later. In contrast, 2 days of training decreased the survival of BrdU‐labeled cells and the density of immature neurons, identified with crmp‐4. This change from increased to decreased survival could not be accounted for by the ages of the cells. Instead, we propose that training may initially increase young granule cell survival, then, if continued, cause them to die. This complex regulation of cell death could potentially serve to maintain granule cells that are actively involved in memory consolidation, while rapidly using and discarding young granule cells whose training is complete to make space for new naïve neurons. Published 2005 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hippocampus Wiley

A natural form of learning can increase and decrease the survival of new neurons in the dentate gyrus

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References (63)

Publisher
Wiley
Copyright
Copyright © 2005 Wiley Subscription Services
ISSN
1050-9631
eISSN
1098-1063
DOI
10.1002/hipo.20097
pmid
16010660
Publisher site
See Article on Publisher Site

Abstract

Granule cells born in the adult dentate gyrus undergo a 4‐week developmental period characterized by high susceptibility to cell death. Two forms of hippocampus‐dependent learning have been shown to rescue many of the new neurons during this critical period. Here, we show that a natural form of associative learning, social transmission of food preference (STFP), can either increase or decrease the survival of young granule cells in adult rats. Increased numbers of pyknotic as well as phospho‐Akt‐expressing BrdU‐labeled cells were seen 1 day after STFP training, indicating that training rapidly induces both cell death and active suppression of cell death in different subsets. A single day of training for STFP increased the survival of 8‐day‐old BrdU‐labeled cells when examined 1 week later. In contrast, 2 days of training decreased the survival of BrdU‐labeled cells and the density of immature neurons, identified with crmp‐4. This change from increased to decreased survival could not be accounted for by the ages of the cells. Instead, we propose that training may initially increase young granule cell survival, then, if continued, cause them to die. This complex regulation of cell death could potentially serve to maintain granule cells that are actively involved in memory consolidation, while rapidly using and discarding young granule cells whose training is complete to make space for new naïve neurons. Published 2005 Wiley‐Liss, Inc.

Journal

Hippocampus – Wiley

Published: Jan 1, 2005

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