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Updated: Dec 23, 2025
Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
Published on: May 29, 2012
Study on the chemodrug-induced effect in nasopharyngeal carcinoma cells using laser tweezer Raman spectroscopy
Sufang Qiu1,2,3,4, Miaomiao Li5,3, Jun Liu6,7
1Department of Radiation Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou 350014, China.
Abstract:
To explore the effect in nasopharyngeal carcinoma (NPC) cells after treatment with chemodrugs, Raman profiles were characterized by laser tweezer Raman spectroscopy. Two NPC cell lines (CNE2 and C666-1) were treated with gemcitabine, cisplatin, and paclitaxel, respectively. The high-quality Raman spectra of cells without or with treatments were recorded at the single-cell level with label-free laser tweezers Raman spectroscopy (LTRS) and analyzed for the differences of alterations of Raman profiles. Tentative assignments of Raman peaks indicated that the cellular specific biomolecular changes associated with drug treatment include changes in protein structure (e.g. 1655 cm-1), changes in DNA/RNA content and structure (e.g. 830 cm-1), destruction of DNA/RNA base pairs (e.g. 785 cm-1), and reduction in lipids (e.g. 970 cm-1). Besides, both principal components analysis (PCA) combined with linear discriminant analysis (LDA) and the classification and regression trees (CRT) algorithms were employed to further analyze and classify the spectral data between control group and treated group, with the best discriminant accuracy of 96.7% and 90.0% for CNE2 and C666-1 group treated with paclitaxel, respectively. This exploratory work demonstrated that LTRS technology combined with multivariate statistical analysis has promising potential to be a novel analytical strategy at the single-cell level for the evaluation of NPC-related chemotherapeutic drugs.
Insights
Label-free laser tweezers Raman spectroscopy (LTRS) effectively identified biomolecular changes in nasopharyngeal carcinoma (NPC) cells treated with chemotherapy. This technique shows promise for evaluating NPC drug efficacy at the single-cell level.
Area of Science:
- Biomedical Optics
- Chemical Biology
- Cancer Research
Background:
- Nasopharyngeal carcinoma (NPC) requires effective chemotherapeutic evaluation.
- Single-cell analysis offers detailed insights into drug effects.
- Raman spectroscopy provides label-free molecular information.
Purpose of the Study:
- To investigate the impact of chemotherapeutic drugs on NPC cells using Raman spectroscopy.
- To analyze single-cell biomolecular alterations induced by gemcitabine, cisplatin, and paclitaxel.
- To assess the potential of label-free laser tweezers Raman spectroscopy (LTRS) for evaluating NPC drug responses.
Main Methods:
- Two NPC cell lines (CNE2, C666-1) were treated with gemcitabine, cisplatin, and paclitaxel.
- Label-free laser tweezers Raman spectroscopy (LTRS) was used for single-cell spectral acquisition.
- Multivariate statistical analyses, including PCA, LDA, and CRT, were applied to spectral data.
Main Results:
- LTRS detected significant biomolecular changes in treated NPC cells, including alterations in protein structure, DNA/RNA content, and lipid reduction.
- Specific Raman peaks indicated changes in protein (1655 cm⁻¹), DNA/RNA (830 cm⁻¹, 785 cm⁻¹), and lipids (970 cm⁻¹).
- High discriminant accuracy (up to 96.7%) was achieved in classifying treated versus control cells using PCA/LDA and CRT.
Conclusions:
- LTRS is a powerful tool for label-free, single-cell analysis of chemotherapeutic effects on NPC.
- The study demonstrates LTRS's potential as a novel strategy for evaluating NPC chemotherapeutic drugs.
- Multivariate statistical analysis enhances the capability of LTRS for precise cellular classification and drug response assessment.
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