SERS Endoscopy for Monitoring Intracellular Drug Dynamics

Area of Science:

• Biomedical Optics
• Nanotechnology
• Pharmacology

Background:

• Understanding intracellular drug dynamics is crucial for developing effective cancer treatments.
• Current tools for monitoring drug behavior within cells are limited.
• Doxorubicin is a widely used chemotherapy agent whose precise intracellular actions require further elucidation.

Purpose of the Study:

• To apply surface-enhanced Raman scattering (SERS) endoscopy for real-time monitoring of doxorubicin's intracellular fate.
• To investigate the spatio-temporal dynamics and mechanism of action of doxorubicin in A549 cancer cells.
• To differentiate drug behavior upon direct administration versus delivery system use.

Main Methods:

• Utilized plasmonic nanowires as SERS probes for enhanced signal detection.
• Employed SERS endoscopy for high-resolution imaging of drug distribution within living cells.
• Analyzed doxorubicin's localization, complexation, and DNA intercalation over time.

Main Results:

• Achieved unprecedented spatio-temporal resolution of doxorubicin's intracellular journey.
• Identified nuclear localization and time-dependent DNA intercalation of doxorubicin.
• Distinguished the intracellular dynamics of doxorubicin when administered directly versus via a delivery system.

Conclusions:

• SERS endoscopy provides critical insights into drug mechanisms of action at the cellular level.
• This technique offers a powerful new tool for medicinal chemistry and drug discovery.
• The findings pave the way for improved therapeutic strategies by understanding drug-cell interactions.