Extracellular Matrix Microparticles Improve GelMA Bioink Resolution for 3D Bioprinting at Ambient Temperature

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Bioprinting Technology

Background:

• Current bioinks like gelatin-methacryloyl are low viscosity fluids at room temperature.
• Manufacturing complex 3D tissue geometries with these bioinks requires specialized equipment and cooling systems.

Purpose of the Study:

• To develop a novel bioink formulation for improved 3D bioprinting capabilities.
• To create a bioink that can form self-supporting structures at room temperature, reducing manufacturing complexity.

Main Methods:

• Incorporation of decellularized extracellular matrix microparticles from porcine tracheal cartilage into gelatin-methacryloyl.
• Characterization of the resulting bioink as a yield stress fluid.
• Evaluation of the bioink's performance in terms of linear resolution, print fidelity, and tensile mechanics at 25°C.

Main Results:

• The novel bioink blend exhibits yield stress fluid properties, enabling the formation of self-supporting structures.
• The bioink blend at 25°C demonstrated comparable performance to pure gelatin-methacryloyl at 15°C in key printing metrics.
• Tensile mechanics were maintained, indicating structural integrity of printed constructs.

Conclusions:

• This bioink formulation significantly lowers barriers to manufacturing complex tissue geometries.
• The developed bioink eliminates the need for cryogenic cooling systems, simplifying the bioprinting process.
• This advancement offers a more accessible and efficient approach to 3D bioprinting for tissue engineering applications.