Regulation of spheroid formation and function by microenvironmental geometric configuration

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Hepatocyte self-assembly is crucial for liver tissue engineering and drug testing.
• The microenvironment significantly influences cell behavior and function.
• Geometric cues in microenvironments are underexplored for hepatocyte culture.

Purpose of the Study:

• To investigate the impact of microenvironmental geometric configurations on primary hepatocyte self-assembly.
• To compare cell culture in hollow lumens versus flat surfaces using alginate and polyethylene glycol (PEG) hydrogels.
• To identify optimal geometric shapes for enhanced hepatocyte spheroid formation.

Main Methods:

• Primary hepatocytes were cultured on flat surfaces and within hollow lumens (cylinder, triangular prism, square column) in alginate and PEG hydrogels.
• Cell morphology and functionality were assessed to evaluate culture effectiveness.
• Comparison of cell behavior across different geometric configurations and hydrogel types.

Main Results:

• Hollow lumens, particularly in alginate hydrogel, provided a superior culture environment for rapid hepatocyte spheroid formation compared to flat surfaces.
• Cylindrical lumen geometry emerged as the most effective configuration for promoting hepatocyte aggregation.
• Differences in cell behavior between flat and hollow cylinder environments were more pronounced in PEG hydrogel.

Conclusions:

• Microenvironmental geometry plays a critical role in directing hepatocyte self-assembly and spheroid formation.
• Hollow, cylindrical microenvironments offer significant advantages for culturing hepatocytes.
• Tailoring microenvironmental geometry can enhance the efficiency of spheroid formation for potential therapeutic applications.