Patterned ELR-Gelatin Hydrogels Enable Rapid Endothelial Monolayer Formation via Bioactive Matrix Chemistry and...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Endothelialization is critical for organ-on-chip platforms and vascular implants.
• Slow cell attachment and unstable monolayers limit current endothelialization methods.

Purpose of the Study:

• To engineer elastin-like recombinamer (ELR)-based hydrogels with micro- and nano-gratings.
• To enhance endothelial cell capture and accelerate monolayer formation.
• To establish a materials design framework for vascular interfaces.

Main Methods:

• Fabrication of micro- and nano-gratings in ELR-based hydrogels.
• Engineering of three gelatin-ELR formulations with varying bioactivity (inert, uPA-responsive, RGD-adhesive).
• Evaluation of human iPSC-derived endothelial cell attachment, alignment, and monolayer formation on patterned hydrogels.

Main Results:

• Patterned ELR composites significantly improved endothelial cell retention compared to gelatin.
• ELR2 hydrogels on specific groove geometries showed optimal cell retention and rapid monolayer formation within 14 days.
• ELR incorporation enhanced mechanical properties and generated fibrillar microstructures.

Conclusions:

• Programmable ELR chemistry combined with surface topography engineering creates effective endothelial interfaces.
• This approach provides a versatile platform for vascular biomaterials and microphysiological systems.
• The developed hydrogels overcome limitations in endothelial cell attachment and monolayer formation.