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Updated: Jan 3, 2026

Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy
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Aggregates Dramatically Alter Fibrin Ultrastructure.

Xabel García1, Landry Seyve2, Zera Tellier3

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Fibrinogen aggregates, not composition, significantly alter fibrin network structure. Aggregate-free fibrinogen forms ordered fibers, while aggregates disrupt polymerization, impacting fibrin

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Area of Science:

  • Biochemistry
  • Biophysics
  • Materials Science

Background:

  • Fibrinogen polydispersity is a potential factor influencing fibrin formation and structure.
  • Previous studies have explored various factors affecting fibrin structure, but the specific role of fibrinogen polydispersity requires detailed investigation.

Purpose of the Study:

  • To investigate the influence of fibrinogen polydispersity on the multiscale structure of fibrin.
  • To differentiate the effects of fibrinogen composition versus aggregates on fibrin network formation.

Main Methods:

  • Characterization of two fibrinogen preparations (monodisperse and polydisperse) using compositional analysis (fibrin-stabilizing factor, fibronectin, chain contents, glycosylation, etc.).
  • Assessment of aggregate content using multiangle laser light scattering-coupled size exclusion chromatography and dynamic light scattering.
  • Determination of fibrin multiscale structure using x-ray scattering, spectrophotometry, and confocal microscopy.

Main Results:

  • The polydisperse fibrinogen preparation contained significant aggregates, while the monodisperse preparation was largely aggregate-free.
  • Fibrin formed from aggregate-free fibrinogen exhibited a crystalline longitudinal and lateral structure, creating a mikado-like network.
  • Fibrin formed from aggregate-containing fibrinogen showed networks built around aggregates, indicating disruption of ideal ordering.

Conclusions:

  • Fibrinogen aggregates, rather than minor compositional differences, are a major determinant of fibrin multiscale structure.
  • The presence of aggregates directly influences fibrin polymerization, disrupting the ordered assembly of monomers into protofibrils and fibers.
  • The quantity of aggregates plays a more significant role in determining fibrin structure than subtle compositional variations under identical reaction conditions.