Development of Phase-Separating Microfiber Network Hydrogels to Promote In Vitro Vascularization

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Engineered vascularized tissues hold promise for transplantation and disease modeling.
• Developing in vitro vascularized tissues is challenging due to limited understanding of matrix microstructure's effect on endothelial cell tube formation.

Purpose of the Study:

• To develop novel microfiber network hydrogels with controllable microporous structures.
• To investigate the relationship between hydrogel matrix microstructure and endothelial cell vascularization.
• To enhance in vitro vascularization for regenerative medicine applications.

Main Methods:

• Developed microfiber network hydrogels using protein liquid-liquid phase separation (LLPS).
• Modified gelatin with hydrogen-bonding moieties and combined with hyaluronic acid sodium salt.
• Controlled hydrogel matrix structures via LLPS to influence endothelial cell tube formation.
• Enhanced vascularization using laminin peptides and co-culturing with mesenchymal stem cells.

Main Results:

• Successfully fabricated microporous microfiber network hydrogels.
• Demonstrated that hydrogel matrix microstructure, controlled by LLPS, significantly affects endothelial cell tube formation.
• Achieved improved vascularization through specific matrix modifications and cell co-culture.

Conclusions:

• The developed microfiber network hydrogels provide a promising platform for inducing in vitro vascularization.
• This approach offers potential for advancing regenerative medicine and disease modeling applications.
• Understanding matrix microstructure-cell interactions is key to engineering functional vascularized tissues.