This article is a US Government work and, as such, is in public domain in the United States of America.
A natural form of learning can increase and decrease the survival of new neurons in the dentate gyrus†
Article first published online: 11 JUL 2005
Published 2005 Wiley-Liss, Inc.
Volume 15, Issue 6, pages 750–762, 2005
How to Cite
Olariu, A., Cleaver, K. M., Shore, L. E., Brewer, M. D. and Cameron, H. A. (2005), A natural form of learning can increase and decrease the survival of new neurons in the dentate gyrus. Hippocampus, 15: 750–762. doi: 10.1002/hipo.20097
- Issue published online: 25 JUL 2005
- Article first published online: 11 JUL 2005
- Manuscript Accepted: 12 MAY 2005
- NIMH Division of Intramural Research
- adult neurogenesis;
- granule cell;
- cell death
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.