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The Journal of Neuroscience, October 28, 2009, 29(43):13532-13542; doi:10.1523/JNEUROSCI.3362-09.2009

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Behavioral/Systems/Cognitive
Adult-Born Hippocampal Dentate Granule Cells Undergoing Maturation Modulate Learning and Memory in the Brain

Wei Deng, Michael D. Saxe, Iryna S. Gallina, and Fred H. Gage

Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California 92037

Correspondence should be addressed to Fred H. Gage at the above address. Email: gage{at}salk.edu

Adult-born dentate granule cells (DGCs) contribute to learning and memory, yet it remains unknown when adult-born DGCs become involved in the cognitive processes. During neurogenesis, immature DGCs display distinctive physiological characteristics while undergoing morphological maturation before final integration into the neural circuits. The survival and activity of the adult-born DGCs can be influenced by the experience of the animal during a critical period when newborn DGCs are still immature. To assess the temporal importance of adult neurogenesis, we developed a transgenic mouse model that allowed us to transiently reduce the numbers of adult-born DGCs in a temporally regulatable manner. We found that mice with a reduced population of adult-born DGCs at the immature stage were deficient in forming robust, long-term spatial memory and displayed impaired performance in extinction tasks. These results suggest that immature DGCs that undergo maturation make important contributions to learning and memory.

Received July 14, 2009; revised Sept. 9, 2009; accepted Sept. 10, 2009.

Correspondence should be addressed to Fred H. Gage at the above address. Email: gage{at}salk.edu






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