Related Experiment Video
Updated: Jun 3, 2026
Quantifying Antibody-Dependent Cellular Cytotoxicity in a Tumor Spheroid Model: Application for Drug Discovery
Published on: April 26, 2024
[Microencapsulated multicellular tumor spheroids: preparation and use as a novel in vitro model for drug screening]
Abstract:
In the current study a technique for microencapsulation of human breast adenocarcinoma cells MCF-7 in alginate-chitosan microcapsules is used. Microencapsulation is proposed to generate multicellular tumor spheroids (MTS) based on these cells and to test them further as an in vitro model for anti-tumor drug screening. Cytotoxicity of methotrexate (MTX) was studied on the obtained MTS. A set of MTS with mean size of 150, 200 and 300 m was prepared in function of a cultivation time. After incubation of MTS in cultivation medium containing MTX at concentrations of 1, 2, 10, 50 and 100 nM for 48 hs cell viability was evaluated. MTS were shown to be more resistant to MTX than the monolayer culture, and the resistance to MTX was increased with enhancing a spheroid size. At MTX concentration of 100 nM a number of viable cells in MTS with the size of 300 m was 2.5-fold bigger than that one in monolayer culture. It is suggested that the cells in microencapsulated MTS can better mimic cell behavior in a small size solid tumor than the cells in a monolayer culture. In future microencapsulated MTS can be proposed as a novel in vitro model for anticancer drug screening.
Insights
This study developed microencapsulated tumor spheroids (MTS) using breast cancer cells. These MTS showed increased resistance to methotrexate (MTX) chemotherapy compared to traditional cell cultures, suggesting a better model for drug screening.
Area of Science:
- Biomedical Engineering
- Cancer Biology
- Drug Discovery
Context:
- Developing advanced in vitro models is crucial for accurate anti-cancer drug screening.
- Human breast adenocarcinoma cells (MCF-7) are utilized to create multicellular tumor spheroids (MTS).
- Alginate-chitosan microcapsules are employed for cell encapsulation.
Purpose:
- To establish a microencapsulated multicellular tumor spheroid (MTS) model using MCF-7 cells.
- To evaluate the efficacy of methotrexate (MTX) against MTS of varying sizes.
- To compare the drug resistance of MTS with traditional monolayer cell cultures.
Summary:
- Methotrexate (MTX) cytotoxicity was assessed on alginate-chitosan microencapsulated MCF-7 multicellular tumor spheroids (MTS) ranging from 150 to 300 µm.
- MTS demonstrated significantly higher resistance to MTX compared to monolayer cultures, with resistance increasing proportionally with spheroid size.
- At 100 nM MTX, 300 µm MTS exhibited 2.5-fold greater cell viability than monolayer cultures, indicating enhanced drug resistance.
Impact:
- Microencapsulated MTS show potential as a more predictive in vitro model for anti-cancer drug screening.
- This model better replicates the microenvironment and cellular behavior within solid tumors.
- Findings suggest improved accuracy in preclinical drug evaluation for breast cancer therapeutics.
