Engineered peptide modified hydrogel platform for propagation of human pluripotent stem cells

Area of Science:

• Stem Cell Biology
• Biomaterials Science
• Regenerative Medicine

Background:

• Human pluripotent stem cells (hPSCs) are crucial for regenerative medicine but require colony formation for survival, limiting scalability.
• Dissociation-induced apoptosis occurs when hPSCs lose E-cadherin mediated cell-cell contact, hindering single-cell culture.
• Current methods often rely on undefined Matrigel, compromising translational potential.

Purpose of the Study:

• To develop a defined hydrogel substrate functionalized with synthetic E-cadherin peptides.
• To mimic cell-cell contact and improve single-cell hPSC viability and expansion.
• To evaluate the substrate's impact on hPSC pluripotency and differentiation potential.

Main Methods:

• Alginate hydrogels were functionalized with synthetic peptides mimicking the extracellular E-cadherin domain.
• Human pluripotent stem cells were cultured on these modified hydrogels as single cells.
• Cell attachment, viability, proliferation, pluripotency, and differentiation potential were assessed.

Main Results:

• Alginate hydrogels conjugated with E-cadherin peptides supported high initial cell attachment and viability.
• The functionalized hydrogels enabled significant hPSC propagation and high fold expansion.
• hPSCs cultured on the peptide-modified substrates retained pluripotency and differentiation capacity.

Conclusions:

• Synthetic E-cadherin peptides on hydrogels effectively mimic cell-cell contact, preventing apoptosis in single-cell hPSC cultures.
• This defined substrate facilitates scalable expansion of hPSCs while maintaining their essential characteristics.
• The developed hydrogel presents a cost-effective, translatable alternative to Matrigel for hPSC applications.