In Vitro Anticancer Drug Sensitivity Sensing through Single-Cell Raman Spectroscopy.

Area of Science:

• Biomedical Engineering
• Cell Biology
• Spectroscopy

Background:

• Traditional in vitro anticancer drug sensitivity testing is slow and prone to false positives.
• Existing methods often fail to capture cellular heterogeneity in drug response.

Purpose of the Study:

• To develop a rapid and reliable single-cell method for evaluating anticancer drug efficacy.
• To introduce Raman-deuterium isotope probing (Raman-DIP) as a novel drug screening tool.

Main Methods:

• Utilized confocal Raman microscopy and deuterium labeling (heavy water) to probe cellular metabolic activity.
• Applied Raman-DIP to human non-small cell lung cancer (HCC827) and breast cancer (MCF-7) cell lines.
• Tested efficacy against eight different anticancer drugs.

Main Results:

• Raman-DIP detected metabolic changes as early as 12 hours, independent of cell growth.
• The method accurately determined drug effects, reducing testing time from 72-144 hours to 48 hours.
• Observed significant heterogeneity in single-cell responses to anticancer drugs.

Conclusions:

• Raman-DIP offers a faster and more reliable alternative for in vitro drug efficacy evaluation.
• This technique has the potential to improve cancer drug discovery and personalize drug susceptibility testing.
• Single-cell analysis provides crucial insights into drug response heterogeneity.