Tunable Bicontinuous Macroporous Cell Culture Scaffolds via Kinetically Controlled Phase Separation.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• 3D scaffolds are crucial for cell-based studies, but synthetic hydrogels often lack sufficient porosity.
• Limited pore sizes in hydrogels restrict cell movement and dynamic processes, hindering their mimicry of natural environments.
• Developing biomaterials with controlled, large-scale porosity is essential for advanced cell culture and tissue engineering.

Purpose of the Study:

• To present a straightforward method for creating macroporous biomaterials with tunable pore sizes.
• To investigate the relationship between polymerization kinetics and hydrogel properties like pore diameter and stiffness.
• To demonstrate the utility of these macroporous hydrogels for cell encapsulation and migration.

Main Methods:

• Utilized liquid-liquid phase separation between poly(ethylene glycol) (PEG) and dextran.
• Employed photopolymerization-induced phase separation to generate macroporous hydrogels.
• Controlled pore size (1-200 µm) and gel stiffness by varying light intensity and polymer composition.

Main Results:

• Successfully generated macroporous hydrogels with tunable pore sizes ranging from 1 to 200 µm.
• Demonstrated that polymerization kinetics directly influence pore diameter and gel stiffness.
• Encapsulated human dermal fibroblasts, observing improved cell spreading and migration in macroporous gels compared to bulk gels.

Conclusions:

• Developed a reliable method for creating kinetically-controlled macroporous biomaterials.
• Macroporous hydrogels support cell infiltration, spreading, and migration, offering a promising platform for 3D cell culture.
• These biomaterials provide a more natural environment for cells, advancing tissue engineering and regenerative medicine applications.