Granular Biphasic Colloidal Hydrogels for 3D Bioprinting.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Bioprinting Technology

Background:

• Granular hydrogels are promising for 3D bioprinting, offering cell protection.
• Achieving high print fidelity requires microparticle jamming, which can compromise cell viability.
• Existing methods struggle to balance cell protection and printability.

Purpose of the Study:

• To introduce a novel biphasic granular colloidal bioink for 3D bioprinting.
• To optimize both cell viability and printing fidelity simultaneously.
• To demonstrate the potential for engineering complex tissues and disease models.

Main Methods:

• Development of a biphasic bioink comprising cell-laden polyethylene glycol (PEG) hydrogel microparticles within a gelatin methacryloyl (GelMA)-nanosilicate colloidal network.
• Characterization of the bioink's rheological properties, print fidelity, and structural stability.
• Incorporation of different cell types (β-islet cells and endothelial cells) to demonstrate tissue engineering capabilities.

Main Results:

• The biphasic bioink exhibits outstanding rheological properties, print fidelity, and structural stability.
• Successful engineering of complex tissues with multiple cell types and heterogeneous microenvironments.
• Demonstrated ability to induce cell patterning, enhance vascularization, and direct cellular function.

Conclusions:

• The developed biphasic bioink effectively overcomes the trade-off between cell viability and print fidelity in 3D bioprinting.
• This technology holds significant potential for advanced tissue engineering, disease modeling, and regenerative medicine.
• The approach enables precise control over cellular organization and function within engineered tissues.