Three-dimensional core-shell alginate microsphere for cancer hypoxia simulation in vitro

Area of Science:

• Biomedical Engineering
• Cancer Research
• Cell Biology

Background:

• Hypoxia is a critical factor driving cancer resistance and metastasis.
• Existing in vitro methods for simulating the in vivo hypoxic tumor microenvironment (TME) are limited.
• Developing accessible platforms to study hypoxia-induced cancer behavior is essential.

Purpose of the Study:

• To establish a convenient in vitro system simulating the hypoxic TME using a core-shell alginate structure.
• To investigate the effects of simulated hypoxia on gastric cancer (GC) cell activity, gene expression, and drug resistance.
• To evaluate the utility of this system for preclinical studies.

Main Methods:

• Development of a multi-polymerized alginate-based three-dimensional culture system with a core-shell structure (3d-ACS).
• Culturing gastric cancer cells within the 3d-ACS to simulate in vivo hypoxic conditions.
• Assessing cell activity, hypoxia-inducible factor (HIF) expression, drug responses, and related molecular changes in vitro and in vivo.

Main Results:

• The 3d-ACS successfully simulated hypoxic TME conditions, preventing oxygen diffusion.
• Gastric cancer cells cultured in 3d-ACS formed organoid-like structures.
• Cells exhibited enhanced aggressive growth, decreased drug sensitivity, and altered gene/protein expression profiles consistent with hypoxia.

Conclusions:

• The developed 3d-ACS provides an accessible and effective platform for simulating in vivo hypoxia in vitro.
• This system demonstrates that simulated hypoxia promotes aggressive behavior and drug resistance in gastric cancer cells.
• The platform holds potential for advancing research in hypoxia-driven drug resistance and other preclinical applications.