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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

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, normally used to...
Amyloid Fibrils03:03

Amyloid Fibrils

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, normally used to...

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A11-positive β-amyloid Oligomer Preparation and Assessment Using Dot Blotting Analysis
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Ovine colostrum nanopeptide affects amyloid beta aggregation.

Maria Janusz1, Mirosław Woszczyna, Marek Lisowski

  • 1Department of Immunochemistry, Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland. janusz@immuno.iitd.pan.wroc.pl

FEBS Letters
|December 17, 2008
PubMed
Summary

A nanopeptide fragment of colostral proline-rich polypeptide complex (PRP) inhibits amyloid beta aggregation, a key factor in Alzheimer's disease (AD). This peptide also disrupts existing aggregates and reduces their toxicity.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Alzheimer's disease (AD) is characterized by amyloid beta (Abeta) aggregation.
  • Colostral proline-rich polypeptide complex (PRP) shows potential therapeutic benefits in AD.
  • The specific mechanism of PRP's action on Abeta aggregation is not fully understood.

Purpose of the Study:

  • To investigate the effect of a nanopeptide fragment of PRP (NP) on Abeta1-42 aggregation.
  • To determine if NP can inhibit or disrupt the formation of amyloid beta aggregates.

Main Methods:

  • Thioflavin T (ThT) binding assays to quantify Abeta aggregation.
  • Atomic force microscopy (AFM) to visualize aggregate morphology.
  • Circular dichroism (CD) spectroscopy to analyze structural changes.

Main Results:

  • NP directly interacts with Abeta1-42.
  • NP inhibits the aggregation of Abeta1-42.
  • NP disrupts pre-formed Abeta aggregates, acting as a beta sheet breaker.
  • NP reduces the toxicity associated with aggregated forms of Abeta.

Conclusions:

  • The nanopeptide fragment of PRP (NP) possesses anti-amyloidogenic properties.
  • NP demonstrates potential as a therapeutic agent for Alzheimer's disease by targeting Abeta aggregation and toxicity.