Pioneer glutamatergic cells develop into a morpho-functionally distinct population in the juvenile CA3 hippocampus

Thomas Marissal, Paolo Bonifazi, Michel Aimé Picardo, Romain Nardou, Ludovic Franck Petit, Agnès Baude, Gordon James Fishell, Yehezkel Ben-Ari and Rosa Cossart ()
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Thomas Marissal: Inserm Unité 901
Paolo Bonifazi: School of Physics and Astronomy, Tel Aviv University
Michel Aimé Picardo: Inserm Unité 901
Romain Nardou: Inserm Unité 901
Ludovic Franck Petit: Inserm Unité 901
Agnès Baude: Inserm Unité 901
Gordon James Fishell: and Neural Science, and Langone Medical Center, New York University Neuroscience Institute
Yehezkel Ben-Ari: Inserm Unité 901
Rosa Cossart: Inserm Unité 901

Nature Communications, 2012, vol. 3, issue 1, 1-12

Abstract: Abstract The developing CA3 hippocampus is comprised by highly connected hub neurons that are particularly effective in achieving network synchronization. Functional hub neurons were shown to be exclusively GABAergic, suggesting that the contribution of glutamatergic neurons to physiological synchronization processes at early postnatal stages is minimal. However, without fast GABAergic transmission, a different situation may prevail. In the adult CA3, blocking fast GABAergic transmission induces the generation of network bursts that can be triggered by the stimulation of single pyramidal neurons. Here we revisit the network function of CA3 glutamatergic neurons from a developmental viewpoint, without fast GABAergic transmission. We uncover a sub-population of early-generated glutamatergic neurons that impacts network dynamics when stimulated in the juvenile hippocampus. Additionally, this population displays characteristic morpho-physiological features in the juvenile and adult hippocampus. Therefore, the apparently homogeneous glutamatergic cell population likely displays a morpho-functional diversity rooted in temporal embryonic origins.

Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2318

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DOI: 10.1038/ncomms2318

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