Bioassembly of three-dimensional embryonic stem cell-scaffold complexes using compressed gases.

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Tissue Engineering

Background:

• Tissues possess complex 3D microenvironments crucial for cellular function.
• Replicating these 3D environments in vitro is challenging but essential for regenerative medicine.
• Current methods struggle to create 3D cell-scaffold constructs with precise spatial control.

Purpose of the Study:

• To develop a method for constructing 3D multilayer cell-scaffold complexes.
• To assess the viability and pluripotency of embryonic stem cells (ES cells) within these constructs.
• To investigate the effect of compressed gases on cell viability during bioassembly.

Main Methods:

• Mouse ES cells were cultured on microstructured polymeric scaffolds.
• A multilayer cell-scaffold complex was assembled using low-pressure carbon dioxide (CO(2)) or nitrogen (N(2)).
• Cell viability and expression of the pluripotency marker Oct-4 were analyzed.

Main Results:

• Assembled constructs maintained ES cell viability and Oct-4 expression.
• Embryoid body (EB) formation was successfully maintained.
• Replacing CO(2) with N(2) increased cell viability from 80% to 90%.

Conclusions:

• Compressed gas-assisted bioassembly is a viable method for creating 3D stem cell constructs.
• This technique supports stem cell pluripotency and enhances cell survival.
• The approach offers a promising new direction for tissue engineering and cell therapy.