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Luminometric Nanoparticle-Based Assay for High Sensitivity Detection of β-Amyloid Aggregation
Sari Pihlasalo1,2, Takahiro Deguchi2, Maria Virtamo2
1Laboratory of Materials Chemistry and Chemical Analysis, Department of Chemistry, University of Turku , Vatselankatu 2, FI-20500 Turku, Finland.
Analytical Chemistry
|February 22, 2017
Summary
A new nanoparticle assay accurately detects beta-amyloid aggregation, offering a reliable method for screening potential inhibitors. This assay avoids false positives often seen with the thioflavin T assay.
Area of Science:
- Biochemistry
- Nanotechnology
- Assay Development
Background:
- Beta-amyloid (Aβ) aggregation is a key hallmark of Alzheimer's disease.
- Accurate detection and inhibition screening of Aβ aggregation are crucial for therapeutic development.
Purpose of the Study:
- To develop and validate a nanoparticle-based assay using time-resolved luminescence resonance energy transfer (TR-LRET) for detecting Aβ aggregation.
- To compare the performance of the TR-LRET assay with reference methods (AFM, ThT) for Aβ fibrillization and inhibitor screening.
Main Methods:
- Development of a TR-LRET assay based on competitive adsorption to europium(III) polystyrene nanoparticles.
- Monitoring of β-amyloid peptide 1-42 (Aβ42) fibrillization over time.
- Comparison with atomic force microscopy (AFM) and thioflavin T (ThT) assay for fibril detection and inhibitor screening.
Main Results:
- The TR-LRET assay detected Aβ42 fibril formation with sensitivity comparable to AFM and ThT assays.
- AFM and the developed TR-LRET assay showed consistent results in evaluating inhibitor compounds.
- The ThT assay produced contradictory results, indicating potential false positives for inhibitor screening.
Conclusions:
- The developed TR-LRET nanoparticle assay is a viable tool for screening potential β-amyloid aggregation inhibitors.
- The TR-LRET assay provides more reliable results compared to the ThT assay, which may yield false positives.
