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Flow cytometric technique for quantitating cytotoxic response to photodynamic therapy
D L Campbell1, M E Fisher, J G Johnson
1Department of Pathology, Queen's University, Kingston, Ontario, Canada.
Photochemistry and Photobiology
|January 1, 1996
Summary
This study introduces a rapid flow cytometry method to measure cell death from photosensitization, especially for hard-to-grow cancer cells. The new assay accurately assesses cytotoxic responses, proving effective for various cell lines.
Area of Science:
- Cell Biology
- Cancer Research
- Photodynamic Therapy
Background:
- Assessing cytotoxic responses to photosensitization is crucial for cancer therapy development.
- Traditional clonogenic assays are often unsuitable for cell lines with low plating efficiency.
- A need exists for a rapid, reliable non-clonogenic assay for photosensitization studies.
Purpose of the Study:
- To describe a simple flow cytometric technique for rapid measurement of multilog cytotoxic responses to photosensitization.
- To validate the technique using patient-derived small cell lung cancer cell lines.
- To demonstrate the assay's utility for cell lines with low colony-forming efficiency.
Main Methods:
- Flow cytometry utilizing forward scatter and side scatter for cell gating, excluding debris.
- Viability assessment using Calcein AM (live cells) and Ethidium homodimer-1 (dead cells) staining.
- Quantification of cell concentration relative to an internal standard of polystyrene beads.
Main Results:
- The flow cytometric assay rapidly analyzed large cell numbers.
- Photosensitization survival curves for small cell lung cancer cell lines correlated with photosensitizer accumulation.
- Results showed good agreement with the established tritiated thymidine incorporation assay.
Conclusions:
- The described flow cytometric technique provides a rapid and effective method for measuring cytotoxic responses to photosensitization.
- This non-clonogenic assay is particularly valuable for cell lines with low plating efficiencies.
- The technique is broadly applicable for evaluating photosensitization efficacy across diverse cell lines.