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A 3D Cell Death Assay to Quantitatively Determine Ferroptosis in Spheroids
Robin Demuynck1,2, Iuliia Efimova1,3, Abraham Lin4,5
1Cell Death Investigation and Therapy Laboratory, Department of Human Structure and Repair, Ghent University, 9000 Ghent, Belgium.
Cells
|March 19, 2020
Summary
A new 3D Cell Death Assay (3DELTA) method quantifies cell death in tumor spheroids, overcoming limitations of 2D cultures for improved cancer drug screening. This assay efficiently detects ferroptosis and other cell death types in 3D models.
Area of Science:
- Biomedical research
- Cancer research
- Drug discovery
Background:
- Two-dimensional (2D) cell cultures limit the accuracy of drug efficacy testing in cancer research.
- Three-dimensional (3D) cultures, like spheroids, better mimic the in vivo tumor environment.
- Existing cell death assays are insufficient for detailed analysis in 3D cultures, including ferroptosis.
Purpose of the Study:
- To introduce and validate a novel cell death analysis method for 3D cultures, named 3D Cell Death Assay (3DELTA).
- To demonstrate 3DELTA's capability in quantitatively assessing various cell death types, including ferroptosis, within tumor spheroids.
- To highlight the limitations of extrapolating 2D experimental findings to 3D models.
Main Methods:
- Utilized Sytox dyes as a cell death marker in conjunction with Triton X-100 for complete cell permeabilization.
- Optimized Sytox and Triton X-100 concentrations and incubation times for spheroid analysis.
- Validated the 3DELTA method by confirming signal detection from all cells within intact spheroids without disaggregation.
Main Results:
- The 3DELTA assay successfully detected and quantified cell death, including ferroptosis, in tumor spheroids.
- Demonstrated that 3D cultures exhibit reduced sensitivity to cell death induction compared to 2D cultures.
- Confirmed that 3DELTA can analyze intact spheroids, eliminating the need for disaggregation.
Conclusions:
- 3DELTA provides an efficient and quantitative method for analyzing cell death in 3D spheroid models.
- The assay overcomes the scarcity of detailed cell death detection methods for 3D cultures.
- 3DELTA offers a cost-effective approach for identifying and measuring cell death types in 3D cultures, improving cancer research and drug development.
