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Direct Visualization of Model Membrane Remodeling by α-Synuclein Fibrillization
Himanshu Chaudhary1, Vinod Subramaniam2, Mireille M A E Claessens1
1Nanobiophysics, MESA+ Institute for Nanotechnology and MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500AE, Enschede, The Netherlands.
Summary
Alpha-synuclein (αS) fibril growth on membranes causes significant remodeling, stiffening, and lipid extraction, disrupting vesicle integrity. This research reveals novel mechanisms linking αS aggregation to Parkinson's disease pathogenesis.
Area of Science:
- Biochemistry
- Neuroscience
- Membrane Biophysics
Background:
- Alpha-synuclein (αS) interactions with cell membranes are implicated in Parkinson's disease.
- Both αS oligomers and amyloid fibrils are known to disrupt membrane integrity.
- The precise mechanisms by which αS aggregation impacts membrane function remain unclear.
Purpose of the Study:
- To elucidate the mechanism by which alpha-synuclein aggregation affects membrane integrity.
- To investigate the structural and functional consequences of αS fibrillization on lipid bilayers.
Main Methods:
- Utilized giant unilamellar vesicles (GUVs) composed of POPC/POPG lipids.
- Observed the interaction and fibrillization of αS on the surface of GUVs.
- Analyzed membrane remodeling, lipid extraction, and vesicle content loss.
Main Results:
- Mature αS fibrils showed weak adhesion to GUVs.
- In contrast, in-situ fibrillization on membranes induced large-scale remodeling, stiffening, and polyhedral shapes.
- Membrane-bound growing fibrils extracted lipids and led to the consumption of the bilayer, causing loss of vesicle content.
Conclusions:
- Growing αS fibrils, not mature ones, significantly remodel and disrupt membranes.
- Mechanisms include membrane stiffening, lipid extraction, and bilayer consumption by growing fibrils.
- These findings provide new insights into how αS aggregation contributes to membrane dysfunction in Parkinson's disease.