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Related Concept Videos

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
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Aβ seeds resist inactivation by formaldehyde.

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Formaldehyde fixation preserves the prion-like seeding activity of aggregated beta-amyloid (Aβ) in brain tissue. This durability suggests Aβ seeds can persist and spread, aiding Alzheimer's disease research using archived samples.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Cerebral beta-amyloidosis, a hallmark of Alzheimer's disease (AD), can be induced by injecting aggregated beta-amyloid (Aβ) into APP-transgenic mice.
  • This induction process follows a prion-like seeding mechanism, where aggregated Aβ acts as the infectious agent.

Purpose of the Study:

  • To investigate the stability and infectivity of Aβ seeds after formaldehyde fixation.
  • To determine if strain-like conformational properties of Aβ aggregates are retained in fixed tissues.

Main Methods:

  • Intracerebral injection of formaldehyde-fixed AD or aged APP-transgenic mouse brain extracts into young APP-transgenic mice.
  • Amyloid conformation-sensitive luminescent conjugated oligothiophene dye spectral analysis.

Main Results:

  • Formaldehyde fixation partially preserves the Aβ-inducing activity of brain extracts.
  • Spectral analysis confirmed that strain-like properties of aggregated Aβ are maintained in fixed tissues.
  • Aβ seeds demonstrate significant resistance to inactivation and structural alteration by formaldehyde.

Conclusions:

  • Formaldehyde-fixed Aβ seeds retain their biological activity and structural characteristics.
  • The remarkable durability of Aβ seeds may explain their persistence and spread in vivo.
  • These findings enable the study of Aβ aggregate structure-disease relationships in archived formalin-fixed autopsy samples.