Direct and Label-Free Detection of MicroRNA Cancer Biomarkers using SERS-Based Plasmonic Coupling Interference (PCI)...

Area of Science:

• Biomedical Engineering
• Molecular Biology
• Nanotechnology

Background:

• MicroRNAs (miRNAs) are crucial biomarkers for early disease and cancer detection.
• Clinical translation of miRNA biomarkers requires practical screening tools.
• Existing detection methods may lack sensitivity or multiplexing capabilities.

Purpose of the Study:

• To develop and demonstrate a label-free biosensing technique for multiplex miRNA detection.
• To investigate the plasmonic coupling interference (PCI) method for miRNA biomarker analysis.
• To establish the diagnostic potential of PCI nanoprobes for medical applications.

Main Methods:

• Application of surface-enhanced Raman scattering (SERS) with plasmonic coupling interference (PCI).
• Utilized a nanonetwork of nanoparticles interconnected by DNA duplexes for signal generation.
• Analyzed the modulation of SERS signals by target miRNA molecules acting as inhibitors.

Main Results:

• Demonstrated multiplex detection of multiple miRNA cancer biomarkers.
• The PCI technique showed sensitive signal generation due to plasmonic coupling.
• Interference by target miRNAs effectively diminished SERS signals, enabling detection.

Conclusions:

• The PCI technique offers a promising label-free approach for multiplex miRNA detection.
• PCI nanoprobes exhibit significant potential as diagnostic tools for medical applications.
• This method facilitates the advancement of miRNA-based diagnostics.