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Enabling Sensitive Quantification of Exosomes Combining Aptamer-Based Rolling Circle Amplification and Silver
Qing Dong1,2, Xu Sun1, Yuling Wang3
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin 130022, P. R. China.
Analytical Chemistry
|March 28, 2025
Summary
This study introduces a novel, cost-effective method for detecting exosomes, crucial biomarkers for disease. The technique offers high sensitivity and specificity for potential clinical applications in liquid biopsy.
Area of Science:
- Biotechnology
- Nanotechnology
- Biomarker Discovery
Background:
- Exosomes are vital biomarkers in body fluids for disease diagnosis and prognosis.
- Current exosome detection methods lack sensitivity, specificity, and cost-effectiveness for clinical use.
Purpose of the Study:
- To develop a fast, accurate, and cost-effective method for exosome detection.
- To enable sensitive and specific exosome quantification for clinical applications.
Main Methods:
- Utilized CD63 aptamer-functionalized magnetic beads for exosome capture.
- Employed rolling circle amplification (RCA) for signal amplification upon exosome binding.
- Developed a silver nanoparticle (AgNP) aggregation assay for visual or spectroscopic detection.
Main Results:
- Achieved a limit of detection of 4.0 × 10^4 particles/mL visually and 800 particles/mL via UV-vis spectroscopy.
- Demonstrated successful exosome detection in human serum samples.
- The method is rapid, accurate, and cost-effective.
Conclusions:
- The developed method provides a sensitive, specific, and cost-effective approach for exosome detection.
- This technique holds significant potential for clinical applications, particularly in liquid biopsy for disease diagnosis and prognosis.
