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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
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Disrupting Dimeric β-Amyloid by Electric Fields.

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Investigating amyloid beta dimers, researchers found that oscillating electric fields can disrupt these toxic Alzheimer's disease oligomers. This disruption, observed via molecular dynamics, suggests a potential new therapeutic avenue.

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Area of Science:

  • Biophysics
  • Neuroscience
  • Computational Chemistry

Background:

  • Early oligomers of amyloid beta (Aβ) peptides are linked to Alzheimer's disease pathogenesis.
  • The transient nature of these Aβ oligomers hinders structural characterization and understanding of their toxicity.
  • Minimal toxic species, such as β-amyloid dimers, are key targets for therapeutic intervention.

Purpose of the Study:

  • To investigate the structural stability of Aβ42 dimers under oscillating electric fields.
  • To explore the potential of electric fields in disrupting toxic amyloid oligomers.

Main Methods:

  • Utilized deep learning (AlphaFold-multimer) to generate initial models of Aβ42 dimers.
  • Employed molecular dynamics (MD) simulations to analyze dimer flexibility and secondary structure.
  • Conducted MD simulations with an external oscillating electric field (1 GHz) to assess stability.

Main Results:

  • Structurally stable Aβ42 dimer models were identified, consistent with microsecond-long MD sampling.
  • High-strength oscillating electric fields induced a rapid decay of β-sheet content in Aβ42 dimers.
  • Aβ42 dimers exhibited lower structural stability compared to helical leucine zipper peptide dimers under electric fields.

Conclusions:

  • External oscillating electric fields can disrupt the structure of amyloid oligomers.
  • This finding suggests a potential novel approach for targeting Alzheimer's disease pathology.
  • Further experimental validation using brain organoids and in vivo studies is warranted.