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Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice
09:29

Continuous Video Electroencephalogram during Hypoxia-Ischemia in Neonatal Mice

Published on: June 11, 2020

Hypoxia-induced neonatal seizures diminish silent synapses and long-term potentiation in hippocampal CA1 neurons

Chengwen Zhou1, Jocelyn J Bell Lippman, Hongyu Sun

  • 1Department of Neurology, Division of Neuroscience, Children's Hospital, Boston, Massachusetts 02115, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 16, 2011
PubMed

Insights

Neonatal seizures impair brain plasticity by reducing silent synapses and altering synaptic function. Early intervention with an AMPA receptor antagonist can protect against these long-term cognitive deficits.

Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Synaptic Plasticity

Background:

  • Neonatal seizures, such as hypoxia-induced seizures (HS), are linked to epilepsy and adult cognitive impairments.
  • Understanding the mechanisms behind these long-term deficits is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate how HS affects long-term potentiation (LTP) and silent NMDAR-only synapses in the hippocampal CA1 region.
  • To explore the role of AMPA receptors (AMPARs) in seizure-induced synaptic alterations.

Main Methods:

  • Utilized a rodent model of hypoxia-induced seizures (HS).
  • Employed electrophysiology and immunofluorescent confocal microscopy to assess synaptic changes.
  • Administered the AMPA receptor antagonist NBQX post-seizure in vivo.

Main Results:

  • HS significantly decreased silent synapses and increased synaptic AMPARs 48-72 hours post-seizure.
  • A notable attenuation of LTP was observed following HS, persisting into adulthood.
  • NBQX treatment prevented HS-induced silent synapse depletion and preserved LTP.

Conclusions:

  • Early life seizures disrupt synaptic plasticity through a novel mechanism involving AMPARs and silent synapses.
  • Targeting AMPA receptors presents a potential therapeutic strategy to prevent cognitive deficits following neonatal seizures.

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