Surface-engineered substrates for improved human pluripotent stem cell culture under fully defined conditions.

Area of Science:

• Stem Cell Biology
• Biomaterials Science
• Surface Chemistry

Background:

• Current human pluripotent stem cell (hPSC) culture relies on feeder layers, which complicate downstream applications.
• Developing feeder-free systems is crucial for clinical translation and scalable hPSC expansion.

Purpose of the Study:

• To engineer a chemically defined, xeno-free substrate for efficient hPSC culture.
• To optimize surface properties for enhanced cell aggregation, growth, and genetic manipulation of hPSCs.

Main Methods:

• Modification of standard cell culture plastics using UV/ozone radiation.
• Chemical and geometrical surface characterization and optimization.
• Numerical modeling of cell migration to predict aggregation behavior.
• Assessment of hPSC proliferation, reprogramming, and gene targeting on engineered surfaces.

Main Results:

• UV/ozone treated surfaces promote controlled early cell aggregation from dissociated hPSCs.
• Engineered substrates significantly increase undifferentiated hPSC growth compared to feeder-based cultures.
• The chemically defined, xeno-free substrates yield over three times more cells per surface area.
• Reprogramming and gene-targeting protocols are successfully performed on these novel surfaces.

Conclusions:

• Spatially defined culture surfaces offer a superior alternative to feeder layers for hPSC expansion.
• These engineered substrates provide a scalable and standardized platform for clinical applications, including cell therapy and disease modeling.
• The developed system supports factor-free reprogramming, enabling the production of clinically relevant cells from patient samples.