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Related Experiment Videos

Shear flow induces amyloid fibril formation.

Elisabeth K Hill1, Benjamin Krebs, Dianna G Goodall

  • 1Department of Chemical & Biomolecular Engineering and Department of Biochemistry & Molecular Biology, University of Melbourne, Victoria 3010, Australia.

Biomacromolecules
|January 10, 2006
PubMed
Summary

Shear flow induces the formation of amyloidogenic precursors and accelerates amyloid fibril aggregation. High shear rates can also degrade preformed amyloid fibrils, impacting disease mechanisms.

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Area of Science:

  • Biophysics
  • Materials Science
  • Biochemistry

Background:

  • Amyloid fibrils are associated with various diseases.
  • Shear flow is common in physiological systems but its role in amyloid formation is largely uncharacterized.
  • Understanding shear flow's impact on amyloidogenesis is crucial for disease research.

Purpose of the Study:

  • To quantitatively investigate the effect of shear flow on amyloid formation using a novel Couette cell.
  • To monitor amyloidogenesis in situ under varying shear rates.
  • To elucidate the role of shear in generating amyloidogenic precursors and degrading fibrils.

Main Methods:

  • Designed and utilized a novel Couette cell for controlled shear exposure.
  • Monitored amyloid formation of beta-lactoglobulin in situ using real-time fluorescence.

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  • Quantified aggregation and degradation across a range of shear rates.

    • Main Results:

    • Demonstrated shear-induced aggregation of spheroidal seed-like species.
    • Showed that these seeds enhance fibril formation in native beta-lactoglobulin, acting as amyloidogenic precursors.
    • Observed degradation of preformed amyloid fibrils at high shear rates.

    Conclusions:

    • Shear flow actively generates amyloidogenic precursors, influencing fibril formation.
    • High shear rates can lead to the degradation of existing amyloid fibrils.
    • These findings have significant implications for understanding amyloid formation mechanisms in physiological flow environments.