Scaffold-free three-dimensional cell culture utilizing micromolded nonadhesive hydrogels

Area of Science:

• Biotechnology
• Cell Biology
• Tissue Engineering

Background:

• Three-dimensional (3-D) spheroid microtissues are valuable in vitro models for stem cell research, tissue engineering, and cancer biology.
• Existing techniques for spheroid formation face limitations in scalability, cost, geometric control, and practicality.

Purpose of the Study:

• To present an accessible, cost-effective, and scalable technology for generating complex-shaped 3-D microtissues.
• To demonstrate the versatility of the technique across various cell types and their self-assembly behaviors.

Main Methods:

• Cells are seeded onto micromolded, nonadhesive agarose gels with specific recess architectures.
• Cell seeding density dictates spheroid size, allowing for controlled production of hundreds of uniform spheroids in a single pipetting step.
• The proliferation of multicellular tumor spheroids (MCTS) was assessed using a modified 4-\[3-(4-iodophenyl)-2-(4-nitrophenyl)-2H-5-tetrazolio]-1,3-benzene disulfonate (WST-1) assay.

Main Results:

• The technique successfully produced uniform spheroids from diverse primary cells and immortal cell lines, highlighting varied self-assembly phenomena.
• Complex-shaped microtissues, including honeycomb structures, were generated from both homogeneous and mixed cell populations.
• The method proved effective for assembling multicellular tumor spheroids (MCTS) from single cells.

Conclusions:

• This novel technology overcomes previous limitations, offering a practical and scalable solution for 3-D microtissue production.
• The ability to create diverse and complex microtissue architectures facilitates new possibilities in 3-D cell culture and biological research.
• The technique's ease of use and scalability make it suitable for widespread adoption in various life science disciplines.