Enhanced Expansion of Human Pluripotent Stem Cells and Somatic Cell Reprogramming Using Defined and Xeno-Free Culture...

Area of Science:

• Stem Cell Biology
• Regenerative Medicine
• Developmental Biology

Background:

• Human pluripotent stem cells (hPSC) hold promise for developmental biology and regenerative medicine.
• Current applications are limited by the lack of chemically defined and xeno-free culture conditions.
• Scalable, high-quality cell production requires simplified in vitro culture methods.

Purpose of the Study:

• To identify optimal conditions for hPSC initial attachment using PMEDSAH-grafted dishes and defined media.
• To develop a chemically defined and xeno-free culture system for hPSC maintenance and expansion.

Main Methods:

• Systematic testing of supplements and chemicals for hPSC attachment to PMEDSAH-grafted plates.
• Comparison of cell attachment and long-term culture with Matrigel-coated plates.
• Evaluation of cell expansion, chromosomal stability, and reprogramming efficiency.

Main Results:

• Pre-conditioning PMEDSAH plates with 10% human serum (HS) optimized initial hPSC attachment.
• This method enabled long-term hPSC culture and maintenance, outperforming Matrigel.
• A 2.1-fold increase in hPSC expansion without chromosomal abnormalities was achieved.
• Reprogramming efficiency of somatic cells into induced pluripotent stem cells (iPSC) improved (0.37% vs. 0.22%).

Conclusions:

• A defined, xeno-free culture condition using PMEDSAH plates and HS pre-conditioning supports robust hPSC expansion.
• This system facilitates the generation of large populations of hPSC and patient-derived iPSC.
• The developed method is suitable for applications in regenerative and translational medicine.