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Related Experiment Video

Updated: May 2, 2026

Screening for Amyloid Aggregation by Semi-Denaturing Detergent-Agarose Gel Electrophoresis
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Heparin binding confers prion stability and impairs its aggregation.

Tuane C R G Vieira1, Yraima Cordeiro2, Byron Caughey3

  • 1Centro Nacional de Ressonância Magnética Nuclear Jiri Jonas, Instituto de Bioquímica Médica Leopoldo De Meis, Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, and jerson@bioqmed.ufrj.br tuane@bioqmed.ufrj.br.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|March 21, 2014
PubMed
Summary

Glycosaminoglycans (GAGs) like heparin stabilize prion protein (PrP), reducing aggregation in prion diseases. This explains heparin's protective effect and aids developing GAG-based therapies.

Keywords:
glycosaminoglycanneurodegeneration

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Prion diseases involve the conversion of cellular prion protein (PrP) to a pathogenic scrapie form (PrP(Sc)).
  • Glycosaminoglycans (GAGs) act as cofactors in this conversion, exhibiting both pro-conversion and protective effects.

Purpose of the Study:

  • To compare the stability and aggregation propensity of PrP and heparin-PrP complexes.
  • To elucidate the mechanism behind GAGs' paradoxical effects in prion diseases.

Main Methods:

  • Utilized in vitro aggregation assays, including real-time quaking-induced conversion (RT-QuIC).
  • Seeded RT-QuIC with transmissible spongiform encephalopathy-associated PrP forms from mouse and hamster brain homogenates.
  • Investigated the impact of heparin-PrP interaction on PrP stability and aggregation kinetics.

Main Results:

  • Heparin interaction significantly increased the thermal stability of cellular PrP (PrP(C)).
  • Heparin binding reduced temperature-induced PrP aggregation by 8-fold.
  • Low-molecular-weight heparin (LMWHep) altered PrP fibrillization extent and kinetics, slowing the rate constant and extending the lag phase in RT-QuIC.

Conclusions:

  • Findings explain heparin's protective role in prion and prion-like neurodegenerative diseases.
  • The study provides a foundation for developing GAG-based therapeutic strategies against prion diseases.