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Related Experiment Video

Updated: Jul 4, 2026

A11-positive β-amyloid Oligomer Preparation and Assessment Using Dot Blotting Analysis

A11-positive β-amyloid Oligomer Preparation and Assessment Using Dot Blotting Analysis

Published on: May 22, 2018

Cholesterol binding to amyloid-beta fibrils: a TEM study.

J Robin Harris¹

¹Institute of Zoology, University of Mainz, D-55099 Mainz, Germany. rharris@uni-mainz.de

Micron (Oxford, England : 1993)

|July 1, 2008

Summary

Cholesterol-PEG micelles bind differently to amyloid-beta(1-42) fibrils. Binding is periodic to protofibrils and forms a coating on mature fibrils, suggesting varied cholesterol accessibility in Alzheimer's disease research.

Area of Science:

Neuroscience
Biochemistry
Materials Science

Background:

Brain cholesterol plays a role in Alzheimer's disease (AD).
Cholesterol contributes to amyloid plaque formation in AD.
Amyloid-beta(1-42) (Abeta(1-42)) fibrils are key pathological hallmarks of AD.

Purpose of the Study:

To investigate the binding of cholesterol-PEG 600 micelles to Abeta(1-42) fibrils.
To understand how fibril structure influences cholesterol interaction.
To explore the implications for cholesterol's role in AD pathogenesis.

Main Methods:

Transmission Electron Microscopy (TEM) was used to visualize micelle-fibril interactions.
Specimens were negatively stained with uranyl acetate.
Abeta(1-42) fibrils were formed under various conditions, with and without cholesterol-PEG 600.

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Published on: October 20, 2017

Main Results:

Cholesterol-PEG micelles exhibited periodic binding to Abeta(1-42) protofibrils.
A smooth coating of micelles formed on mature double helical fibrils.
Binding regularity differed between protofibrils and mature fibrils, influenced by fibrillogenesis conditions.

Conclusions:

The binding capacity of cholesterol-PEG 600 varies between Abeta(1-42) protofibrils and mature fibrils.
This suggests differences in the accessibility of micellar cholesterol to hydrophobic binding sites on fibril surfaces.
Findings may offer insights into cholesterol's role in AD and Abeta aggregation.