3D Bioprinting of Cell-Laden Hydrogels for Improved Biological Functionality

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Bioprinting Technology

Background:

• 3D bioprinting enables cell patterning but is limited by the lack of suitable bioink materials for creating functional tissue constructs.
• Early bioinks prioritized printability with viscous polymers, often compromising cell viability and biological function.
• Hydrogels in the gel phase offer protection during printing and deliver biological signals for construct maturation.

Purpose of the Study:

• To provide an overview of design considerations for gel-phase materials used as bioinks in 3D bioprinting.
• To evaluate challenges and opportunities in developing bioinks that incorporate cells as an intrinsic component.
• To highlight the importance of mechanical, biochemical, and dynamic gel properties for bioink development.

Main Methods:

• Review of design principles for gel-phase bioink materials.
• Analysis of mechanical, biochemical, and dynamic gel properties.
• Evaluation of challenges and opportunities in bioprinted living hydrogels.

Main Results:

• Gel-phase materials are crucial for protecting cells during 3D bioprinting extrusion.
• Hydrogels can provide essential biological signals for embedded cells during construct culture.
• Considering cells as intrinsic bioink components is key to controlling construct evolution and biofunctionality.

Conclusions:

• Developing advanced gel-phase bioinks is essential for overcoming limitations in 3D bioprinting.
• Engineering hydrogels with integrated cellular components allows for greater control over living construct development.
• Future bioink design must focus on the interplay between material properties and cellular behavior to achieve enhanced biofunctionality.