Related Experiment Video
Updated: Nov 20, 2025
09:16
Exogenous Administration of Microsomes-associated Alpha-synuclein Aggregates to Primary Neurons As a Powerful Cell Model of Fibrils Formation
Published on: June 26, 2018
7.8K
The Cytotoxic Effect of α-Synuclein Aggregates
Francisco Melo1,2, Leonardo Caballero1,2, Esteban Zamorano3
1Departamento de Física, Universidad de Santiago de Chile, Avenida Ecuador 3493, Santiago, Chile.
Summary
Alpha-synuclein oligomers disrupt cell membrane mechanics and function, contributing to Parkinson's disease pathogenesis. Monomers, however, reinforce the lipid bilayer, highlighting distinct roles in neurodegeneration.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder characterized by alpha-synuclein (α-synuclein) aggregation into Lewy bodies.
- α-synuclein's normal function involves vesicle trafficking, but misfolded forms gain pathogenic properties.
Purpose of the Study:
- To investigate the impact of α-synuclein oligomers on cell membrane properties.
- To compare the effects of α-synuclein oligomers and monomers on lipid bilayers.
Main Methods:
- Nanoindentation was used to probe the mechanical properties of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) membranes.
- Lactate dehydrogenase (LDH) release was measured to assess membrane integrity and cytotoxicity.
Main Results:
- α-synuclein oligomers significantly altered the mechanical properties of DOPC membranes.
- In contrast, α-synuclein monomers enhanced the resistance of the lipid bilayer.
- Oligomer-membrane interactions promoted LDH release, indicating cytotoxic events.
Conclusions:
- α-synuclein oligomers impair membrane function and induce cytotoxicity, contributing to Parkinson's disease pathology.
- The distinct effects of monomers and oligomers suggest specific roles in disease progression.
Related Concept Videos
03:03Amyloid Fibrils
11.2K
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,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
11.2K
01:27Cytotoxic T Cells-mediated Immune Response
6.1K
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
6.1K