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Related Experiment Videos

A parturition-associated nonsynaptic coherent activity pattern in the developing hippocampus.

Valérie Crépel1, Dmitriy Aronov, Isabel Jorquera

  • 1INMED, INSERM, U29, Université de La Méditerranée, Parc scientifique de Luminy, BP 13, 13273 Marseille Cedex 09, France.

Neuron
|April 6, 2007
PubMed
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The delivery process triggers the first synchronized neuronal activity in the developing hippocampus. This early network coherence, mediated by oxytocin, is then replaced by synapse-driven activity shortly after birth.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Computational Neuroscience

Background:

  • Correlated neuronal activity is crucial for neural network formation.
  • The emergence of this activity during maturation, particularly in the hippocampus, remains poorly understood.

Purpose of the Study:

  • To investigate the developmental trajectory of population coherence in the hippocampus from embryonic to postnatal stages.
  • To elucidate the mechanisms and signaling pathways involved in the emergence and subsequent silencing of early network activity.

Main Methods:

  • Multibeam two-photon calcium imaging to monitor neuronal activity.
  • Targeted electrophysiological recordings to assess neuronal function.
  • Analysis of network activity patterns across embryonic (E16-E19) and postnatal stages.

Related Experiment Videos

Main Results:

  • Embryonic stages (E16-E19) exhibit absent synchronized activity, with neurons showing intrinsic L-type channel-mediated calcium spikes.
  • At birth, spontaneous synchronous nonsynaptic calcium plateaus emerge in small cell assemblies coupled by gap junctions.
  • Oxytocin initiates this early coherence, which is subsequently suppressed by synapse-driven giant depolarizing potentials (GDPs) a few days postnatally.

Conclusions:

  • Delivery acts as a critical signal initiating the first coherent activity pattern in the developing hippocampus.
  • The transition from intrinsic to synaptic activity patterns shapes early hippocampal network development.
  • Oxytocin and giant depolarizing potentials play key, sequential roles in regulating early hippocampal network synchrony.