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Elife. 2017 Jan 30;6. pii: e19886. doi: 10.7554/eLife.19886.

Adult-born neurons modify excitatory synaptic transmission to existing neurons.

Author information

1
Department of Neurobiology, University of Alabama at Birmingham, Birmingham, United States.

Abstract

Adult-born neurons are continually produced in the dentate gyrus but it is unclear whether synaptic integration of new neurons affects the pre-existing circuit. Here we investigated how manipulating neurogenesis in adult mice alters excitatory synaptic transmission to mature dentate neurons. Enhancing neurogenesis by conditional deletion of the pro-apoptotic gene Bax in stem cells reduced excitatory postsynaptic currents (EPSCs) and spine density in mature neurons, whereas genetic ablation of neurogenesis increased EPSCs in mature neurons. Unexpectedly, we found that Bax deletion in developing and mature dentate neurons increased EPSCs and prevented neurogenesis-induced synaptic suppression. Together these results show that neurogenesis modifies synaptic transmission to mature neurons in a manner consistent with a redistribution of pre-existing synapses to newly integrating neurons and that a non-apoptotic function of the Bax signaling pathway contributes to ongoing synaptic refinement within the dentate circuit.

KEYWORDS:

EPSC; adult neurogenesis; competition; dentate gyrus; developmental biology; granule cells; mouse; neuroscience; stem cells; synaptic transmission

PMID:
28135190
PMCID:
PMC5279947
DOI:
10.7554/eLife.19886
[Indexed for MEDLINE]
Free PMC Article

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