An electrochemical biosensor for immobilization coupling and quantifying exosomes based on a UiO-66 metal-organic...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Research

Background:

• Extracellular vesicles, especially exosomes, are emerging as crucial cancer biomarkers.
• Exosome membrane proteins provide insights into parent cell status and serve as accessible targets.
• Early detection of lung cancer is critical for improving patient outcomes.

Purpose of the Study:

• To develop a sensitive electrochemical biosensor for quantifying lung cancer-derived exosomes.
• To utilize a Zr-based UiO-66 metal-organic framework for exosome immobilization and detection.
• To assess the biosensor's performance in terms of sensitivity, linear range, and limit of detection.

Main Methods:

• Fabrication of an electrochemical biosensor incorporating UiO-66 metal-organic framework.
• Immobilization of exosomes via coupling with UiO-66 and phosphate groups.
• Detection of lung cancer exosomes using carcinoembryonic antigen (CEA) aptamers targeting CEA protein.
• Electrochemical analysis for exosome quantification.

Main Results:

• The biosensor achieved high sensitivity with a wide linear range (10^2 to 5 x 10^6 particles/μL).
• A low limit of detection (7 particles/μL) was demonstrated.
• Selective binding of CEA-specific exosomes from different lung cancer subtypes was observed, indicating clinical potential.

Conclusions:

• The developed electrochemical biosensor offers a sensitive and efficient method for detecting lung cancer exosomes.
• The biosensor shows promise for early clinical diagnosis of lung cancer due to its affordability, sensitivity, and ease of operation.
• This approach provides a valuable tool for cancer biomarker research and clinical applications.