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Single-Exosome-Counting Immunoassays for Cancer Diagnostics
Chunchen Liu1, Xiaonan Xu1, Bo Li
1Department of Mechanical and Aerospace Engineering , The Hong Kong University of Science and Technology , Hong Kong , China.
Nano Letters
|June 12, 2018
Summary
We developed a droplet digital enzyme-linked immunosorbent assay (ELISA) for precise quantification of cancer exosomes. This method enables highly accurate, noninvasive cancer diagnosis using minimal clinical samples.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Cancer Research
Background:
- Exosomes are crucial biomarkers for cancer diagnostics due to their unique composition.
- Quantifying low concentrations of exosomes in small clinical volumes is vital for noninvasive cancer detection and prognosis.
Purpose of the Study:
- To develop a highly sensitive and accurate method for quantifying cancer-specific exosomes.
- To enable noninvasive cancer diagnosis and prognosis through exosome detection.
Main Methods:
- Developed a droplet-based single-exosome-counting enzyme-linked immunoassay (droplet digital ExoELISA).
- Immobilized exosomes on magnetic microbeads using sandwich ELISA with enzymatic reporters.
- Utilized droplet microfluidics for single-bead encapsulation and digital quantification.
Main Results:
- Achieved a limit of detection (LOD) as low as 10 enzyme-labeled exosome complexes per microliter (∼10-17 M).
- Demonstrated successful quantitative detection of exosomes in plasma samples from breast cancer patients.
- The droplet digital ExoELISA platform provides absolute counting for unprecedented accuracy.
Conclusions:
- The droplet digital ExoELISA platform offers a sensitive and accurate method for cancer exosome quantification.
- This approach holds potential for early cancer diagnosis and accelerating the discovery of exosomal biomarkers.
- The technology may significantly advance noninvasive cancer diagnostics and prognostics.
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