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Researchers discovered novel amyloid-beta (Aβ) filament structures, type Ic and Id, within cotton wool plaques (CWPs) in Alzheimer disease (AD). This finding advances understanding of Aβ aggregation and AD pathology.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Cotton wool plaques (CWPs) are a neuropathologic hallmark in certain forms of Alzheimer disease (AD), particularly those linked to PSEN1 mutations.
  • CWPs are characterized by amyloid-beta (Aβ) positivity but lack a distinct amyloid core, differentiating them from typical Aβ plaques.
  • These plaques contain amino-terminally truncated and modified Aβ species, with associated tau-positive neurites.

Purpose of the Study:

  • To elucidate the structural characteristics of Aβ filaments within CWPs.
  • To investigate the distinct Aβ species and aggregation patterns contributing to CWP formation.
  • To explore the implications for Alzheimer disease pathogenesis and therapeutic strategies.

Main Methods:

  • Cryo-electron microscopy was employed to analyze Aβ filaments.
  • Filaments were extracted from the brains of two individuals with dominantly inherited AD due to PSEN1 mutations (V261I and A431E).

Main Results:

  • Two novel arrangements of type I Aβ filaments, designated type Ic and type Id, were identified as the primary components of CWPs.
  • Type Id filaments exhibit unique protofilament packing, differing from the parallel arrangement of type Ic, Ib, and other Aβ filaments.
  • Type Ic filaments share structural similarities with type I Aβ filaments, while type Id filaments display antiparallel and asymmetric packing.

Conclusions:

  • The distinct Aβ filament structures (type Ic and Id) in CWPs suggest a unique Aβ peptide composition compared to sporadic AD core plaques.
  • These findings highlight the role of diverse Aβ filament structures in the morphological variations of Aβ deposits in AD.
  • Characterizing these Aβ filaments offers insights into AD pathogenesis and may inform the development of novel diagnostic and therapeutic approaches.