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Updated: Jan 30, 2026

An Integrated Raman Spectroscopy and Mass Spectrometry Platform to Study Single-Cell Drug Uptake, Metabolism, and Effects
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Single-Cell Screening of Tamoxifen Abundance and Effect Using Mass Spectrometry and Raman-Spectroscopy

Ahmed Ali1,2, Yasmine Abouleila1,2, Yoshihiro Shimizu1

  • 1Riken Biodynamics Research Center (BDR) , 6-2-3 Furuedai , Suita , Osaka 565-0874 , Japan.

Analytical Chemistry
|January 22, 2019
PubMed

Insights

Researchers monitored anticancer drug tamoxifen in single cells using Raman spectroscopy and live single-cell mass spectrometry (LSC-MS). This approach successfully identified drug response and quantified drug uptake and metabolism at the single-cell level.

Area of Science:

  • Pharmacology
  • Analytical Chemistry
  • Biophysics

Background:

  • Understanding drug pharmacokinetics at the single-cell level is crucial for advancing drug discovery.
  • Current methods often lack the resolution to analyze drug uptake, metabolism, and response in individual cells.
  • Developing novel techniques for single-cell pharmacokinetic analysis is essential for personalized medicine.

Purpose of the Study:

  • To demonstrate the feasibility of using Raman spectroscopy and live single-cell mass spectrometry (LSC-MS) for monitoring anticancer drug tamoxifen at the single-cell level.
  • To evaluate Raman spectroscopy as a label-free method for predicting single-cell drug response.
  • To quantify tamoxifen and its metabolite 4-Hydroxytamoxifen (4-OHT) in single cells using LSC-MS.

Main Methods:

  • Live single-cell mass spectrometry (LSC-MS) was employed for sensitive and selective quantification of tamoxifen and 4-OHT.
  • Raman spectroscopy was utilized as a label-free technique to screen and identify single-cell responses to tamoxifen.
  • A combined approach of Raman spectroscopy and LSC-MS was used to analyze drug pharmacokinetics in individual cells.

Main Results:

  • Raman spectral signatures were observed to change upon tamoxifen treatment, enabling prediction of drug response.
  • LSC-MS analysis revealed heterogeneity in tamoxifen and 4-OHT levels, as well as the metabolite-to-drug ratio among single cells.
  • Correlations between tamoxifen and its metabolite, and potential links between Raman spectral intensities and drug abundance/metabolism, were identified.

Conclusions:

  • This study pioneers the use of Raman spectroscopy and LSC-MS for comprehensive single-cell pharmacokinetic investigations.
  • The combined techniques offer a powerful platform for understanding drug behavior at the cellular level.
  • These findings have significant implications for drug discovery and the development of targeted therapies.

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