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Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
04:41

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

Published on: July 14, 2010

β-Amyloid carrying the Dutch mutation has diverse effects on calpain-mediated toxicity in hippocampal neurons

Alexandra M Nicholson1, Lindsey A Wold, Dominic M Walsh

  • 1Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America.

Molecular Medicine (Cambridge, Mass.)
|December 14, 2011
PubMed

Insights

The Dutch mutation (E22Q) in amyloid precursor protein (APP) causes synaptic deficits similar to wild-type amyloid-beta (Aβ). However, it reduces toxic tau cleavage and neuronal death in Alzheimer's disease models.

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Hereditary cerebral hemorrhage with amyloidosis-Dutch type is linked to an APP gene mutation (E693Q).
  • This condition causes cognitive deficits and Alzheimer's disease (AD)-like dementia.
  • The molecular mechanisms of mutated Aβ toxicity on neurons are not fully understood.

Purpose of the Study:

  • To investigate the role of calpain-mediated toxicity in the effects of Dutch mutant Aβ (E22Q) on neurons.
  • To compare the effects of Dutch mutant Aβ (E22Q) with wild-type (WT) Aβ in a primary neuronal culture model.

Main Methods:

  • Utilized a primary hippocampal culture model.
  • Assessed calpain-mediated cleavage of dynamin 1 and tau.
  • Quantified synaptic contacts and neuronal death.

Main Results:

  • Dutch mutant Aβ (E22Q) induced calpain-mediated cleavage of dynamin 1 and reduced synaptic contacts, similar to WT Aβ.
  • Calpain-mediated tau cleavage and subsequent neuronal death were significantly reduced by E22Q Aβ compared to WT Aβ.
  • Demonstrated a complex regulation of calpain-mediated toxicity by E22Q Aβ.

Conclusions:

  • Dutch mutant Aβ (E22Q) induces synaptic deficits through calpain-mediated pathways.
  • E22Q Aβ exhibits a neuroprotective effect against tau cleavage and cell death, differentiating it from WT Aβ.
  • These findings offer insights into the pathobiology of familial Alzheimer's disease associated with the Dutch mutation.

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