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Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
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Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices

Published on: July 15, 2010

Alzheimer's disease amyloid beta-protein forms Zn(2+)-sensitive, cation-selective channels across excised membrane

M Kawahara1, N Arispe, Y Kuroda

  • 1Department of Molecular and Cellular Neurobiology, Tokyo Metropolitan Institute for Neuroscience, Japan.

Biophysical Journal
|July 1, 1997
PubMed

Insights

Amyloid beta-protein (AβP[1-40]) forms cation-selective channels in natural GnRH neuron membranes, similar to artificial ones. Zinc ions block these channels, suggesting a role in AβP[1-40] neurotoxicity.

Area of Science:

  • Neuroscience
  • Biophysics
  • Molecular Biology

Background:

  • Amyloid beta-protein (AβP[1-40]) forms cation-selective channels in artificial membranes.
  • Investigating AβP[1-40] channel formation in natural neuronal membranes is crucial for understanding its neurotoxicity.

Purpose of the Study:

  • To determine if AβP[1-40] forms cation-selective channels in natural neuronal membranes.
  • To characterize the properties of these channels and the effect of zinc ions.
  • To investigate the in vivo association of AβP[1-40] with neuronal membranes.

Main Methods:

  • Utilized excised membrane patches from GnRH neurons.
  • Performed electrophysiological recordings to measure channel activity and ion flow.
  • Employed immunocytochemical confocal microscopy to visualize AβP[1-40] deposits.

Main Results:

  • AβP[1-40] spontaneously formed cation-selective channels in GnRH neuron membrane patches.
  • Channel conductance varied (50-500 pS) and followed ion gradients.
  • Zinc ions blocked channel activity, reversible by o-phenanthroline, indicating direct interaction.
  • AβP[1-40] deposits were observed associated with GnRH neuron plasma membranes in vivo.

Conclusions:

  • AβP[1-40] forms functional cation-selective channels in natural neuronal membranes.
  • Zinc binding to AβP[1-40] channels influences their function.
  • These findings support the hypothesis that AβP[1-40] channel formation contributes to neurotoxicity.

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