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Membrane-disordering effects of beta-amyloid peptides
W E Müller1, C Kirsch, G P Eckert
1Department of Pharmacology, Biocenter University of Frankfurt, Marie-Curie Strasse 9, D-60439 Frankfurt, Germany. PharmacolNat@em.uni-frankfurt.de
Biochemical Society Transactions
|August 11, 2001
Summary
Beta-amyloid (Abeta) peptides, found in Alzheimer's disease (AD) plaques, alter cell membrane fluidity. This disruption of the acyl-chain layer may be an early step in AD pathogenesis.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Beta-amyloid (Abeta) protein aggregates form senile plaques and cerebrovascular deposits in Alzheimer's disease (AD).
- The precise mechanism linking Abeta to AD-induced neurodegeneration remains unclear.
Purpose of the Study:
- To investigate the effects of Abeta on cell membrane fluidity.
- To determine if Abeta's interaction with membranes is an early biological event in AD.
Main Methods:
- Utilized fluorescent probes to measure changes in cell membrane fluidity.
- Examined membrane fractions from various tissues and species, including human.
Main Results:
- Low concentrations of Abeta significantly altered cell membrane fluidity across different tissues and species.
- Abeta peptides specifically disturbed the acyl-chain layer of cell membranes.
- The polar head region of the phospholipid bilayer and membrane proteins were less affected.
Conclusions:
- Abeta's alteration of cell membrane fluidity, particularly the acyl-chain layer, is a significant biological effect.
- This membrane perturbation may represent an initial step in the pathogenesis of Alzheimer's disease.