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Conditional reduction of adult neurogenesis impairs bidirectional hippocampal synaptic plasticity.

ABSTRACT: Adult neurogenesis is a process by which the brain produces new neurons once development has ceased. Adult hippocampal neurogenesis has been linked to the relational processing of spatial information, a role attributed to the contribution of newborn neurons to long-term potentiation (LTP). However, whether newborn neurons also influence long-term depression (LTD), and how synaptic transmission and plasticity are affected as they incorporate their network, remain to be determined. To address these issues, we took advantage of a genetic model in which a majority of adult-born neurons can be selectively ablated in the dentate gyrus (DG) and, most importantly, in which neurogenesis can be restored on demand. Using electrophysiological recordings, we show that selective reduction of adult-born neurons impairs synaptic transmission at medial perforant pathway synapses onto DG granule cells. Furthermore, LTP and LTD are largely compromised at these synapses, probably as a result of an increased induction threshold. Whereas the deficits in synaptic transmission and plasticity are completely rescued by restoring neurogenesis, these synapses regain their ability to express LTP much faster than their ability to express LTD. These results demonstrate that both LTP and LTD are influenced by adult neurogenesis. They also indicate that as newborn neurons integrate their network, the ability to express bidirectional synaptic plasticity is largely improved at these synapses. These findings establish that adult neurogenesis is an important process for synaptic transmission and bidirectional plasticity in the DG, accounting for its role in efficiently integrating novel incoming information and in forming new memories.

SUBMITTER: Massa F

PROVIDER: S-EPMC3081011 | biostudies-literature | 2011 Apr

REPOSITORIES: biostudies-literature

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Conditional reduction of adult neurogenesis impairs bidirectional hippocampal synaptic plasticity.

Massa Federico F Koehl Muriel M Wiesner Theresa T Grosjean Noelle N Revest Jean-Michel JM Piazza Pier-Vincenzo PV Abrous Djoher Nora DN Oliet Stéphane H R SH

Proceedings of the National Academy of Sciences of the United States of America 20110404 16

Adult neurogenesis is a process by which the brain produces new neurons once development has ceased. Adult hippocampal neurogenesis has been linked to the relational processing of spatial information, a role attributed to the contribution of newborn neurons to long-term potentiation (LTP). However, whether newborn neurons also influence long-term depression (LTD), and how synaptic transmission and plasticity are affected as they incorporate their network, remain to be determined. To address thes ...[more]

PMID: 21464314

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Dataset Information

Conditional reduction of adult neurogenesis impairs bidirectional hippocampal synaptic plasticity.

Publications

Conditional reduction of adult neurogenesis impairs bidirectional hippocampal synaptic plasticity.

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