Core-shell hydrogel beads with extracellular matrix for tumor spheroid formation

Area of Science:

• Biomedical Engineering
• Cancer Research
• Materials Science

Background:

• Multicellular tumor spheroids offer a more accurate preclinical model than traditional monolayer cultures for evaluating anticancer treatments.
• Tumor cell behavior and organization are significantly influenced by interactions with the extracellular matrix.
• Developing advanced in vitro tumor models is crucial for effective drug development.

Purpose of the Study:

• To engineer a microfluidic system for generating core-shell beads that support the formation of multicellular tumor spheroids.
• To incorporate extracellular matrix components within the beads to better mimic the tumor microenvironment.
• To compare the efficacy of anticancer drugs on spheroids versus monolayer cultures.

Main Methods:

• A microfluidic chip with a cooled flow path was used for simultaneous formation of core-shell beads via flow focusing.
• The bead core contained alginate, collagen, and reconstituted basement membrane, gelled by temperature.
• The bead shell consisted of alginate hydrogel, gelled by ionic crosslinking, providing structural integrity.

Main Results:

• The core-shell bead system successfully encapsulated MCF-7 cells and facilitated the formation of uniform multicellular spheroids.
• Spheroids formed when all three core components (alginate, collagen, reconstituted basement membrane) were present.
• The dose-dependent responses of MCF-7 spheroids to docetaxel and tamoxifen were evaluated and compared to monolayer cultures.

Conclusions:

• The microfluidic core-shell bead system provides a robust platform for generating advanced multicellular tumor spheroids.
• This model system enhances the study of tumor biology and the evaluation of anticancer drug efficacy.
• The developed method offers a promising alternative to conventional cell culture for cancer research.