Magneto-Archimedes based 3D cell economic bioassembly.

Area of Science:

• Bioengineering
• Biomaterials Science
• Cell Biology

Background:

• Constructing three-dimensional (3D) cell assemblies is crucial for bioengineering.
• High cellular density and spatial distribution are key for biomimetic fidelity.
• Increasing cell density in bioinks often leads to significant cell loss during bioprinting.

Purpose of the Study:

• To introduce a novel 3D bioassembly strategy that overcomes cell loss during high-density cell construct fabrication.
• To achieve high cell density, low cell loss, and precise spatial control in 3D cell assemblies.

Main Methods:

• Utilized the Magneto-Archimedes effect with a 3D magnetic field generated by vertically aligned magnet arrays.
• Remotely drove and assembled diamagnetic cells in a paramagnetic medium into desired 3D configurations.
• Developed a 3D cell economic bioassembly strategy (3D MACE) for efficient cell manipulation.

Main Results:

• Achieved high cell density (up to 10⁸ cells/mL) with minimal cell loss (<5%).
• Demonstrated precise cell manipulation within confined and complex environments, including porous scaffolds.
• Successfully generated 3D cell migration and angiogenesis models in vitro.
• Enabled the formation of complex 3D architectures and customized patterns.

Conclusions:

• The 3D MACE strategy effectively resolves the trade-off between high cell density and low cell loss in biofabrication.
• This method offers high controllability, excellent accessibility, and enables advanced 3D cell assembly for tissue engineering.
• Presents a novel approach for creating biomimetic 3D cell constructs with unprecedented efficiency and precision.