bFGF Oligomeric Stability Drives Functional Performance in Human Pluripotent Stem Cells.

Area of Science:

• Stem Cell Biology
• Biochemistry
• Cell Therapy Manufacturing

Background:

• Basic fibroblast growth factor (bFGF) and Transforming growth factor-beta (TGF-β) are crucial for maintaining human pluripotent stem cell (hPSC) pluripotency and self-renewal.
• bFGF is vital for sustaining the undifferentiated state in hPSCs, often supplied via conditioned media.
• TGF-β supports hPSC expansion and contributes to a supportive stem cell niche through signaling pathway modulation.

Purpose of the Study:

• To investigate the impact of growth factor quality and variability on hPSC culture performance.
• To assess the purity and identify impurities in bFGF and TGF-β from different sources using physicochemical methods.
• To correlate analytical data with observed effects on hPSC culture.

Main Methods:

• Development and application of multiple physicochemical characterization techniques.
• Size exclusion chromatography (SEC) for assessing protein size and aggregation.
• Reverse-phase chromatography (RPC) for evaluating protein purity and identifying modifications.

Main Results:

• Certain TGF-β post-translational modifications (e.g., oxidation) did not significantly affect hPSC culture.
• Temperature-dependent instability in bFGF preparations demonstrably altered hPSC morphology and growth.
• Physicochemical analysis revealed variations in growth factor purity and impurity profiles across different sources.

Conclusions:

• Consistent hPSC maintenance requires stringent quality control of growth factor components in culture media.
• Correlating physicochemical data with process performance is valuable for material understanding and process development.
• Identifying critical material attributes of growth factors is essential for ensuring the quality of cell therapy products.