A rapid biofabrication technique for self-assembled collagen-based multicellular and heterogeneous 3D tissue...

Area of Science:

• Biomaterials Engineering
• Cell Biology
• Tissue Engineering

Background:

• Monolayer cell cultures lack in vivo complexity.
• Multicellular spheroids offer 3D environments but have limitations in scale and speed.
• Existing 3D models struggle with cell-matrix interactions and precise spatial arrangement.

Purpose of the Study:

• To develop a versatile and rapid method for fabricating multicellular tissue constructs.
• To create 3D cell culture models that better mimic the in vivo microenvironment.
• To enable precise spatial patterning of multiple cell types within constructs.

Main Methods:

• Utilized microfabricated molds for rapid self-assembly of cells and extracellular matrix.
• Developed a process that consolidates constructs within 6 hours.
• Demonstrated applicability to various cell types and numbers (10^4-10^6).

Main Results:

• Fabricated mechanically robust constructs in diverse shapes (spherical, cuboidal, dumbbell, cross-like).
• Non-spherical shapes maintained integrity during long-term culture.
• Achieved precise spatial patterning of multiple cell types, creating heterogeneous constructs.
• Demonstrated versatility across multiple cancer cell lines, osteosarcoma, and endothelial cells.

Conclusions:

• The novel method offers rapid, versatile, and robust fabrication of 3D multicellular tissue constructs.
• This approach overcomes limitations of existing techniques in speed, shape retention, and heterogeneity.
• The technology holds significant potential for drug discovery, disease modeling, and tissue graft development.