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3D spheroids' sensitivity to electric field pulses depends on their size
Laure Gibot1, Marie-Pierre Rols
1IPBS-CNRS, 205 route de Narbonne, BP64182, F-31077, Toulouse, France.
The Journal of Membrane Biology
|March 23, 2013
Summary
Small multicellular tumor spheroids are more sensitive to electric field pulses (EP) than larger ones. Spheroid size, not formation method, impacts EP response, crucial for 3D cell model research.
Area of Science:
- Cell biology
- Biophysics
- Biomedical engineering
Background:
- Three-dimensional (3D) cell cultures better mimic in vivo conditions than 2D monolayers.
- Multicellular tumor spheroids are a versatile 3D model for studying cell behavior, carcinogenesis, and drug screening.
- Recent studies explore spheroids for investigating electropermeabilization (EP).
Purpose of the Study:
- To investigate the response of multicellular tumor spheroids to electrical field pulses (EP).
- To determine how spheroid characteristics like age, diameter, and formation technique influence EP sensitivity.
Main Methods:
- Human HCT-116 colorectal cancer spheroids of varying diameters were cultured using hanging drop and nonadherent techniques.
- Spheroids were subjected to controlled electrical field pulses (8 pulses, 100 μs duration, 1,300 V/cm intensity).
- Spheroid growth was monitored over 4 days to assess the impact of EP.
Main Results:
- Smaller spheroids (300 μm diameter) showed a twofold decrease in growth over 4 days post-EP.
- Larger spheroids (650 μm diameter) were unaffected by the same EP treatment.
- EP sensitivity was consistent regardless of the spheroid formation method (hanging drop vs. nonadherent).
Conclusions:
- Spheroid size is a critical factor determining sensitivity to electrical field pulses.
- Experimental conditions and spheroid characteristics must be considered to avoid biased results in 3D cell model studies.
- These findings are vital for optimizing EP-based applications using spheroid models.
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