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 and cell integration.
• Hydrogel microparticles (HMPs) are promising for bioprinting but require specific adaptations for DLP techniques.

Purpose of the Study:

• To develop and optimize photocrosslinkable HMP bioinks for DLP 3D bioprinting.
• To enhance cell incorporation, printing resolution, and multi-material capabilities in DLP bioprinting using HMPs.

Main Methods:

• Fabrication of photocrosslinkable hydrogel microparticles (HMPs) with controlled size.
• Optimization of HMP bioink formulations for DLP printing, including aqueous component mixing and crosslinking conditions.
• Evaluation of printing resolution, structural fidelity, and cytocompatibility of cell-laden HMP constructs.

Main Results:

• DLP printing of HMPs eliminated jamming constraints, improving resolution and cytocompatibility compared to extrusion methods.
• Smaller HMPs (approx. 28 µm) yielded superior structural fidelity.
• Cell-laden HMP bioinks demonstrated high cell viability, uniform distribution, and supported cell growth.
• Multi-material printing was achieved using the modular HMP system.

Conclusions:

• Developed HMP bioinks are suitable for DLP 3D bioprinting, enabling high-resolution fabrication of complex tissue constructs.
• This approach enhances cell viability and distribution, offering a versatile platform for tissue engineering.
• The modularity of HMPs facilitates multi-material bioprinting for advanced tissue mimicry.