Photocrosslinkable Hydrogel Microparticle Bioink for Digital-Light-Processing 3D Bioprinting

Area of Science:

• Biotechnology
• Materials Science
• Tissue Engineering

Background:

• Digital light processing (DLP) 3D bioprinting offers high resolution but faces challenges with bioink limitations, heterogeneous material printing, and cell integration.
• Hydrogel microparticle (HMP) bioinks are typically used in extrusion-based printing, relying on jamming, which limits resolution and cell viability.

Purpose of the Study:

• To develop and optimize photocrosslinkable hydrogel microparticle (HMP) bioinks specifically for DLP 3D bioprinting.
• To overcome the limitations of traditional HMP bioinks and enhance DLP bioprinting capabilities for tissue engineering.

Main Methods:

• Development of photocrosslinkable HMP bioinks with aqueous components ensuring printability.
• Optimization of HMP size, crosslinking conditions, and UV exposure for high-resolution DLP printing.
• Assessment of cell viability, distribution, and growth within printed constructs.

Main Results:

• DLP printing of HMPs eliminated jamming constraints, improving resolution and cytocompatibility compared to extrusion methods.
• Smaller HMPs (28.2 µm) yielded better structural fidelity than larger ones (75.0 µm).
• Optimized printing parameters and HMP bioinks supported high cell viability, uniform distribution, and cell growth, enabling multi-material printing.

Conclusions:

• This study successfully adapted HMP bioinks for DLP 3D bioprinting, creating a versatile platform for advanced tissue fabrication.
• The developed HMP bioinks enable high-resolution printing of complex structures with excellent cell integration and multi-material capabilities.
• This approach significantly expands the potential of HMP bioinks in biomanufacturing microscopic tissue constructs for regenerative medicine.