Label-Free SERS Sensors for Real-Time Monitoring of Tyrosine Phosphorylation

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Chemical Biology

Background:

• Dysregulation of receptor tyrosine kinases (RTKs) is linked to cancer progression and therapeutic resistance.
• Current methods for monitoring kinase activity, like Western blotting and ELISAs, are often indirect and lack real-time capabilities.
• Accurate monitoring of RTK activity is crucial for understanding cancer biology and evaluating drug effectiveness.

Purpose of the Study:

• To develop a novel sensor for real-time monitoring of kinase activity.
• To investigate the potential of gold nanoparticle-based surface-enhanced Raman scattering (SERS) for detecting tyrosine phosphorylation.
• To establish a chemical sensing approach for assessing drug efficacy through kinase activity.

Main Methods:

• Development of a gold nanoparticle-based surface-enhanced Raman scattering (SERS) sensor.
• Utilized a reporter peptide (Axltide) for monitoring tyrosine phosphorylation by the Axl enzyme.
• Detection of phosphorylation through both chemical and enzymatic methods, analyzing SERS spectral changes.

Main Results:

• The developed SERS sensor demonstrated strong signal localization.
• Tyrosine phosphorylation of the reporter peptide was successfully detected via SERS, showing characteristic peak changes.
• Real-time monitoring of phosphorylation events was achieved by observing changes in the SERS spectrum.

Conclusions:

• A novel gold nanoparticle-based SERS sensor enables real-time monitoring of tyrosine phosphorylation.
• This sensor provides a sensitive and direct method for assessing kinase activity.
• The developed SERS approach holds promise for advancing biomedical insights and evaluating drug efficacy in cancer research.