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Related Experiment Videos

Amyloid fibril proteins.

Yanming Xing1, Keiichi Higuchi

  • 1Department of Aging Angiology, Research Center on Aging and Adaptation, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan.

Mechanisms of Ageing and Development
|December 10, 2002
PubMed
Summary
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Amyloidosis involves protein misfolding into harmful amyloid fibrils, seen in Alzheimer's and prion diseases. A common pathogenesis model suggests exogenous fibrils can trigger this process, blurring lines between transmissible and non-transmissible forms.

Area of Science:

  • Biochemistry
  • Neuroscience
  • Pathology

Background:

  • Amyloidosis comprises protein misfolding disorders where soluble proteins form insoluble amyloid fibrils.
  • These fibrils are implicated in severe diseases like Alzheimer's disease (AD) and prion diseases.
  • Senile amyloidosis, age-related, involves increased amyloid deposition without clear causes.

Purpose of the Study:

  • To introduce Alzheimer's disease, prion diseases, and mouse senile amyloidosis.
  • To discuss the nucleation-dependent polymerization model for amyloid fibril formation.
  • To propose a common pathogenic mechanism for different amyloidosis types.

Main Methods:

  • Review and discussion of existing literature on amyloid diseases.
  • Examination of the nucleation-dependent polymerization model.

Related Experiment Videos

  • Analysis of fibril deposition in AD (Abeta), prion diseases (PrP(Sc)), and mouse senile amyloidosis (AApoAII).

    • Main Results:

    • Amyloid diseases share a core event: structural transformation of proteins into beta-sheet fibrils.
    • The nucleation-dependent polymerization model explains fibrillization kinetics.
    • Exogenous amyloid fibrils can act as templates, initiating polymerization of endogenous proteins.

    Conclusions:

    • A unified hypothesis suggests exogenous amyloid fibrils can trigger polymerization, potentially unifying transmissible and non-transmissible amyloidosis pathogenesis.
    • This model offers a common pathway for diseases like Alzheimer's, prion diseases, and senile amyloidosis.
    • Further research is needed to fully elucidate the complex mechanisms of amyloid disease.