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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
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Rapid Generation of Amyloid from Native Proteins In vitro
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The relationship between amyloid structure and cytotoxicity.

Karen E Marshall1, Ricardo Marchante1, Wei-Feng Xue1

  • 1School of Life Sciences; University of Sussex; Falmer, East Sussex UK; School of Biological Sciences; University of Kent; Canterbury, Kent UK.

Prion
|May 14, 2014
PubMed
Summary

Amyloid structures, linked to diseases, can be toxic or benign. Understanding the varied toxicity of these protein assemblies is crucial for disease research and therapeutic development.

Keywords:
Amyloidosisamyloidcross-βcytotoxicitydepositionfibriloligomerstructure

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Molecular Biology

Background:

  • Proteins and peptides self-assemble into amyloid structures.
  • Amyloid assemblies are associated with neurodegenerative and prion diseases.
  • Both toxic and benign amyloid species exist, challenging assumptions of generic toxicity.

Purpose of the Study:

  • To investigate the reasons behind the varied toxic potential of amyloid structures.
  • To explore the links between amyloidogenic structures, assembly mechanisms, and functional effects.
  • To propose hypotheses for the relationship between amyloid structure and toxicity.

Main Methods:

  • Review of recent reports on amyloid sequence, structure, and toxicity.
  • Analysis of different aspects of amyloidogenic structures and assembly mechanisms.
  • Formulation of testable hypotheses.

Main Results:

  • Amyloid assemblies exhibit a spectrum of toxicity, from highly toxic oligomers to relatively benign forms.
  • Functional amyloids demonstrate that not all amyloid structures are inherently toxic.
  • Common molecular architecture does not dictate uniform toxic potential.

Conclusions:

  • The varied toxicity of amyloid structures is linked to specific structural features and assembly pathways.
  • Further research is needed to elucidate the precise mechanisms governing amyloid toxicity.
  • Understanding these relationships is key for developing targeted therapies for amyloid-related diseases.