Engineered hydrogel biomaterials facilitate lung progenitor cell differentiation from induced pluripotent stem cells

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Regenerative Medicine

Background:

• Lung progenitor (LP) cells, identified by NKX2.1 expression, are crucial for lung development and regenerative medicine.
• Current differentiation protocols often use poorly defined natural materials like Matrigel, facing regulatory hurdles.
• Engineered hydrogels present a tunable and well-defined alternative for stem cell differentiation.

Purpose of the Study:

• To investigate the efficacy of engineered poly(ethylene glycol) norbornene (PEGNB) hydrogels for differentiating human-induced pluripotent stem cells (iPSCs) into LP cells.
• To systematically evaluate the impact of microenvironmental stiffness, cell origin, and splitting on LP differentiation efficiency.
• To compare the performance of engineered hydrogels against Matrigel controls.

Main Methods:

• Fabrication of PEGNB hydrogels with controlled stiffness.
• Differentiation of iPSCs into LP cells on hydrogel substrates and Matrigel.
• Assessment of LP cell proportion using flow cytometry.
• Systematic investigation of stiffness, cell origin, and splitting parameters.

Main Results:

• Soft hydrogels (4.00 ± 0.25 kPa) mimicking healthy lung stiffness yielded the highest LP cell proportion (54%).
• Engineered hydrogels demonstrated comparable or superior LP differentiation efficiency compared to Matrigel controls (32%).
• Microenvironmental stiffness, cell origin, and splitting significantly influenced differentiation outcomes.

Conclusions:

• Engineered hydrogels provide a well-defined and effective microenvironment for iPSC-to-LP cell differentiation.
• These biomaterials offer a promising, reproducible, and potentially FDA-approvable alternative to Matrigel for regenerative medicine.
• Utilizing engineered biomaterials can enhance control over differentiation and facilitate clinical translation of iPSC-derived therapies.