Quantitative characterization of 3D bioprinted structural elements under cell generated forces.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Mechanobiology

Background:

• 3D bioprinting technology is advancing, creating constructs that mimic real tissues.
• Fundamental principles governing cell-generated forces in biofabricated structures remain unclear, hindering predictable design.

Purpose of the Study:

• To investigate the mechanical behaviors of 3D bioprinted microbeams under cell-generated forces.
• To develop predictive mechanical models for cell-extracellular matrix microbeam mechanics.

Main Methods:

• Bioprinting 3D microbeams from living cells and extracellular matrix into a 3D microgel culture medium.
• Systematically varying microbeam and microgel properties to observe mechanical responses.
• Developing mechanical models based on observed behaviors like buckling and contraction.

Main Results:

• Observed various mechanical behaviors including buckling, axial contraction, and structural failure.
• Demonstrated static stability in some cell-extracellular matrix microbeam configurations.
• Successfully developed mechanical models to describe microbeam mechanics.

Conclusions:

• Cell-generated forces significantly influence the mechanical behavior and stability of 3D bioprinted microbeams.
• The developed models provide a foundation for the predictable design of biofabricated structures.
• This work paves the way for engineering more complex and functional biofabricated tissues.