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Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
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Phenolic compounds prevent amyloid β-protein oligomerization and synaptic dysfunction by site-specific binding

Kenjiro Ono1, Lei Li, Yusaku Takamura

  • 1Department of Neurology and Neurobiology and Aging, Kanazawa University Graduate School of Medical Science, Kanazawa 920-8640, Japan.

The Journal of Biological Chemistry
|March 7, 2012
PubMed

Insights

Phenolic compounds like myricetin and rosmarinic acid prevent amyloid-beta (Aβ) aggregation and reduce toxicity in Alzheimer

Area of Science:

  • Neuroscience
  • Biochemistry
  • Pharmacology

Background:

  • Alzheimer disease (AD) is characterized by amyloid-beta (Aβ) protein deposition in the brain.
  • Epidemiological studies suggest dietary phenolic compounds may reduce AD incidence.
  • Myricetin (Myr) and rosmarinic acid (RA) previously inhibited Aβ aggregation in vitro and in vivo.

Purpose of the Study:

  • To investigate the mechanistic basis of how phenolic compounds affect Aβ aggregation.
  • To analyze the impact of five phenolic compounds on Aβ oligomerization and synaptic toxicity.

Main Methods:

  • Assessed the effects of five phenolic compounds on the Aβ aggregation process.
  • Evaluated the impact of phenolic compounds on oligomer-induced synaptic toxicities.
  • Utilized Nuclear Magnetic Resonance (NMR) spectroscopy to analyze molecular interactions.

Main Results:

  • Phenolic compounds effectively blocked Aβ oligomerization.
  • Myricetin (Myr) induced significant NMR chemical shift changes in monomeric Aβ.
  • Both Myr and rosmarinic acid (RA) reduced cellular toxicity and synaptic dysfunction caused by Aβ oligomers.

Conclusions:

  • Myricetin and rosmarinic acid demonstrate potential in mitigating Alzheimer disease pathology.
  • These compounds may inhibit Aβ toxicity and early assembly through distinct binding mechanisms.
  • Further research into Myr and RA as therapeutic agents for AD is warranted.

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