Cells cultured for regenerative medicine or drug safety testing require artificial environments. They attach to protein layers on culture dish surfaces, not directly to the dish. The optimal protein scaffold formation has been unclear.
A research team led by Associate Professor Tomohiro Hayashi at Institute of Science Tokyo investigated how ultraviolet/ozone (UVO) treatment affects protein scaffold formation and cell attachment.
Key Findings
- UVO treatment modifies surface properties by creating hydrophilic regions while leaving some hydrophobic regions.
- Optimal cell attachment occurred after 1-2 minutes of UVO treatment, when hydrophilic and hydrophobic regions coexist.
- Longer treatment resulted in overly hydrophilic surfaces, reducing accumulation of cell-attachment proteins and decreasing cell attachment.
- Cell attachment depends on the composition of the protein layer, not solely on surface hydrophilicity.
Background
UVO treatment is a common method to improve cell attachment, but the mechanism was unknown. Previous assumptions that more hydrophilic surfaces improve attachment could not explain why extended treatment reduces attachment. The study examined surface chemistry and protein quantity, type, and dynamic exchange.
Implications
The findings suggest that a slightly heterogeneous surface (mixed hydrophilicity and hydrophobicity) creates better cell scaffolds than a perfectly uniform surface.
This knowledge could guide development of improved cell culture dishes, artificial organ materials, and regenerative medicine materials.