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Using Nanoplasmon-Enhanced Scattering and Low-Magnification Microscope Imaging to Quantify Tumor-Derived Exosomes
Published on: May 24, 2019
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Quantum dot-based sensitive detection of disease specific exosome in serum
Kseniia Boriachek1, Md Nazmul Islam1, Vinod Gopalan2
1School of Natural Sciences, Griffith University Nathan Campus, QLD 4111, Australia. m.shiddiky@griffith.edu.au and Queensland Micro- and Nanotechnology Centre, Griffith University Nathan Campus, QLD 4111, Australia.
The Analyst
|May 24, 2017
Summary
This study introduces a novel electrochemical assay using quantum dots to detect cancer-specific exosomes. The method offers sensitive quantification of exosomes, paving the way for improved cancer diagnostics.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Nanotechnology
Background:
- Tumor-derived exosomes are valuable cancer biomarkers.
- Existing detection methods for exosomes can be complex and lack sensitivity.
- There is a need for efficient and specific exosome detection assays.
Purpose of the Study:
- To develop a stripping voltammetric immunoassay for sensitive and specific detection of disease-specific exosomes.
- To utilize quantum dots as signal amplifiers for enhanced electrochemical detection.
- To validate the assay for cancer biomarker detection in cell lines and patient serum samples.
Main Methods:
- Magnetic capture of exosomes using generic tetraspanin antibodies (CD9/CD63).
- Identification of disease-specific exosomes with cancer-related antibodies (HER-2, FAM134B) conjugated to Cadmium Selenide Quantum Dots (CdSeQDs).
- Electrochemical detection via anodic stripping voltammetry after acid dissolution of CdSeQDs to quantify Cd2+.
Main Results:
- Sensitive detection limit of 100 exosomes per μL.
- Low relative standard deviation (<5.5%) in cancer cell lines.
- Successful detection in a small cohort of colorectal cancer patient serum samples.
Conclusions:
- The developed assay demonstrates high sensitivity and specificity for disease-specific exosome detection.
- Quantum dot-amplified electrochemical detection offers a promising approach for exosome quantification.
- This method has potential for clinical application in cancer diagnostics.
