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Published in: Brain Structure and Function 4/2015

Open Access 01-07-2015 | Original Article

Pre-existing astrocytes form functional perisynaptic processes on neurons generated in the adult hippocampus

Authors: Marine Krzisch, Silvio G. Temprana, Lucas A. Mongiat, Jan Armida, Valentin Schmutz, Mari A. Virtanen, Jacqueline Kocher-Braissant, Rudolf Kraftsik, Laszlo Vutskits, Karl-Klaus Conzelmann, Matteo Bergami, Fred H. Gage, Alejandro F. Schinder, Nicolas Toni

Published in: Brain Structure and Function | Issue 4/2015

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Abstract

The adult dentate gyrus produces new neurons that morphologically and functionally integrate into the hippocampal network. In the adult brain, most excitatory synapses are ensheathed by astrocytic perisynaptic processes that regulate synaptic structure and function. However, these processes are formed during embryonic or early postnatal development and it is unknown whether astrocytes can also ensheathe synapses of neurons born during adulthood and, if so, whether they play a role in their synaptic transmission. Here, we used a combination of serial-section immuno-electron microscopy, confocal microscopy, and electrophysiology to examine the formation of perisynaptic processes on adult-born neurons. We found that the afferent and efferent synapses of newborn neurons are ensheathed by astrocytic processes, irrespective of the age of the neurons or the size of their synapses. The quantification of gliogenesis and the distribution of astrocytic processes on synapses formed by adult-born neurons suggest that the majority of these processes are recruited from pre-existing astrocytes. Furthermore, the inhibition of astrocytic glutamate re-uptake significantly reduced postsynaptic currents and increased paired-pulse facilitation in adult-born neurons, suggesting that perisynaptic processes modulate synaptic transmission on these cells. Finally, some processes were found intercalated between newly formed dendritic spines and potential presynaptic partners, suggesting that they may also play a structural role in the connectivity of new spines. Together, these results indicate that pre-existing astrocytes remodel their processes to ensheathe synapses of adult-born neurons and participate to the functional and structural integration of these cells into the hippocampal network.
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Metadata
Title
Pre-existing astrocytes form functional perisynaptic processes on neurons generated in the adult hippocampus
Authors
Marine Krzisch
Silvio G. Temprana
Lucas A. Mongiat
Jan Armida
Valentin Schmutz
Mari A. Virtanen
Jacqueline Kocher-Braissant
Rudolf Kraftsik
Laszlo Vutskits
Karl-Klaus Conzelmann
Matteo Bergami
Fred H. Gage
Alejandro F. Schinder
Nicolas Toni
Publication date
01-07-2015
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 4/2015
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-014-0768-y

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