A defined glycosaminoglycan-binding substratum for human pluripotent stem cells

Area of Science:

• Stem cell biology
• Biomaterials science
• Regenerative medicine

Background:

• Defined culture conditions are crucial for human pluripotent stem cells (hPSCs) in regenerative medicine, developmental biology, and drug discovery.
• While defined media exist for hESCs, robust, chemically defined substrata remain a challenge.
• Existing culture methods often rely on undefined components or complex matrices.

Purpose of the Study:

• To identify synthetic peptide surfaces that support self-renewal of hPSCs.
• To develop chemically defined substrata for long-term culture of pluripotent stem cells.
• To advance applications of hPSCs in regenerative medicine and drug discovery.

Main Methods:

• Utilized self-assembled monolayers to screen peptide surfaces for hPSC culture.
• Identified heparin-binding peptides as effective substrates.
• Cultured hESCs on these peptide surfaces in defined media for over 3 months.

Main Results:

• Heparin-binding peptide surfaces effectively sustained self-renewal of hPSCs.
• Cells cultured for over 3 months maintained normal karyotype and pluripotency markers.
• The identified peptides supported growth of eight different pluripotent cell lines on various scaffolds.

Conclusions:

• Synthetic substrates recognizing cell-surface glycans, specifically heparin-binding peptides, can facilitate long-term culture of pluripotent stem cells.
• These defined peptide surfaces offer a robust and scalable solution for hPSC culture.
• This advancement is critical for the clinical translation of hPSC-based therapies and research.