The shift to utilising 3D cancer models remains an attractive option to investigate more clinically relevant features. Previously, breast and ovarian cancer cells have been grown as spheroids as part of our in-house projects. Following drug treatment, fluorescently labelled dyes enabled a detailed annotation of the spheroids to delineate regions that are either viable or have undergone cell death. Complementing this work is our two imaging platforms, JuLI Stage and ImageXpress Pico System, which can perform an array of functions including live imaging and time lapse capture to support with spheroid assays and related projects.
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3D spheroid models
MDA-MB436 cells cultured in 3D cell culture media were allowed to form spheroids 5 days prior to Talazoparib and Bleomycin drug treatment. Following the drug treatment, spheroids were stained with DEAD Red and SYTO Green fluorescent dye every 72 hours. Spheroid growth and morphology were assessed using JuLITM Stage Automated cell imaging system to determine the effect of drug treatments. Combination of Talazoparib and Bleomycin resulted in an increase in cell death and an observable loss of spheroids.
Spheroids were generated by seeding MCF7 cells at 5,000 cells per well in Nunclon U-bottomed ULA 96-well plates. Growth was monitored microscopically, spheroid area was plotted against day post-seeding for different seeding densities.
MCF7 spheroids were seeded at 10,000 cells per well and at 3 days post-seeding were treated with Doxorubicin for a further 5 days. Growth was monitored and viability assessed by means of the CellGlo Titer 3D assay, compared to cells grown as 2D monolayer cultures.
Consistency of spheroid form in different cell types
Morphology of spheroids reflects strength of cell:cell adhesion-A2780 and MCF7 spheroids are globular and irregular. This indicates that cells join the spheroid as it forms and adhere before starting to grow. Smooth spheroids, such as those formed by A549 and HCT116 cells, indicate that the cells can roll and move when the spheroid is formed, packing together more efficiently.
High-throughput Doxorubicin Assay
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