Hypoxia-induced loss of synaptic transmission is exacerbated in hippocampal slices of transgenic mice expressing C-terminal fragments of Alzheimer amyloid precursor protein

Othman Ghribi, Luc Lapierre, Martine Girard, Maurice Ohayon, Josephine Nalbantoglu, Guy Massicotte

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Abstract

To investigate the possible involvement of β-amyloid (Aβ) in disrupting neuronal function during ischemia, we examined whether overexpression of C-terminal fragments of β-amyloid precursor protein (β-APP) in transgenic (Tg) mice is capable of altering the capacity of hippocampus slices to recover synaptic transmission after transient hypoxic episodes. Recovery of synaptic transmission was monitored in area CA1 of perfused hippocampal slices prepared from both control and Tg mice. The results obtained indicate that hippocampal slices prepared from Tg mice exhibited a much lower level of recovery in synaptic transmission following reoxygenation. This reduction in the capacity of Tg slices to recover from hypoxia-induced impairment of synaptic transmission in the hippocampus does not appear to be related to pre-existing alterations in either functional or biochemical properties of glutamate receptors in Tg mice. The present results provide the first experimental evidence that overexpression of the C-terminal fragment of APP exacerbates functional damage of hippocampal neurons after hypoxic episodes.

Original languageEnglish (US)
Pages (from-to)201-205
Number of pages5
JournalHippocampus
Volume9
Issue number3
DOIs
Publication statusPublished - Jul 12 1999

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Keywords

  • CA1 slices
  • Hippocampus
  • Ischemia
  • Mice
  • Transgenic

ASJC Scopus subject areas

  • Cognitive Neuroscience

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