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Updated: May 9, 2026

Interactions with and Membrane Permeabilization of Brain Mitochondria by Amyloid Fibrils
Published on: September 28, 2019
Aggregation modulators interfere with membrane interactions of β2-microglobulin fibrils
Tania Sheynis1, Anat Friediger, Wei-Feng Xue
1Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
Certain compounds like epigallocatechin gallate and heparin can prevent amyloid fibril damage to cell membranes. This finding offers new therapeutic strategies for amyloid diseases beyond targeting protein self-assembly.
Area of Science:
- Biochemistry
- Cell Biology
- Neuroscience
Background:
- Amyloid fibril accumulation is a key feature of neurodegenerative and metabolic diseases.
- Misfolded protein interactions with cell membranes contribute to amyloid pathologies and cytotoxicity.
- Current therapies primarily target amyloid aggregate formation, not membrane interactions.
Purpose of the Study:
- To investigate how fibrillation modulators impact the membrane interactions of beta2-microglobulin (β2m) fibrils.
- To explore the therapeutic potential of targeting these membrane interactions.
Main Methods:
- Utilized dye-release assays to measure membrane damage.
- Employed fluorescence anisotropy of labeled lipids to assess membrane fluidity and interaction.
- Applied confocal and cryo-electron microscopy for structural and interaction analysis.
- Tested polyphenols (EGCG, bromophenol blue, resveratrol) and glycosaminoglycans (heparin, heparin disaccharide) as modulators.
Main Results:
- Polyphenols and glycosaminoglycans showed differential effects on β2m fibril-membrane interactions.
- Epigallocatechin gallate (EGCG) and heparin effectively prevented membrane damage caused by β2m fibrils.
- Other tested compounds (bromophenol blue, resveratrol, heparin disaccharide) had minimal or no protective effect.
- Modulators influenced membrane interactions, suggesting a mechanism beyond aggregate disruption.
Conclusions:
- Fibrillation modulators can interfere with amyloid fibril interactions with cell membranes.
- Epigallocatechin gallate and heparin represent promising agents for preventing amyloid-induced membrane damage.
- This study highlights a novel therapeutic avenue for amyloid diseases by targeting membrane interactions.
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