Synthetic hydrogels support robust and reproducible cardiomyocyte differentiation

Area of Science:

• Biotechnology
• Stem Cell Biology
• Materials Science

Background:

• Cardiomyocyte manufacturing from human pluripotent stem cells (hPSCs) faces challenges due to variable differentiation efficiencies.
• The widely used tumor-derived substrate, Matrigel, contributes to this variability and poses safety concerns.

Purpose of the Study:

• To identify fully-defined synthetic polyethylene glycol (PEG) hydrogels that support the adhesion, survival, and differentiation of hPSC-derived cardiac progenitor cells (iPSC-CPCs).
• To optimize substrate formulations for enhanced and reproducible generation of iPSC-derived cardiomyocytes (iPSC-CMs).

Main Methods:

• A screening approach was employed to test various synthetic PEG hydrogels with systematically varied properties.
• A 5-level, 3-variable full factorial screening design combined with multivariate analysis was utilized.
• Key parameters evaluated included adhesion ligand type and concentration, and substrate stiffness.

Main Results:

• The developed PEG hydrogels demonstrated superior iPSC-CM differentiation efficiency, evidenced by a 24% increase in cardiac troponin T (cTnT) expression compared to Matrigel.
• Greater reproducibility in iPSC-CM differentiation was achieved using the synthetic hydrogels.
• Substrate variables, including adhesion ligand type/concentration and stiffness, significantly influenced iPSC-CPC confluency and iPSC-CM differentiation.

Conclusions:

• Fully-defined synthetic PEG hydrogels offer a tunable and reproducible platform for cardiomyocyte manufacturing from hPSCs.
• This approach overcomes the limitations associated with traditional substrates like Matrigel.
• Multivariate screening of synthetic materials is crucial for optimizing cell culture conditions and achieving targeted cellular behaviors for regenerative medicine.