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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Tuning hydrogel mechanics in 3D is challenging due to coupled changes in material properties.
  • Existing polyethylene glycol diacrylate (PEGDA) hydrogels struggle to achieve physiologically relevant low stiffness (<10 kPa).

Purpose of the Study:

  • To develop a method for independently controlling PEGDA hydrogel mechanics without altering polymer density.
  • To investigate the effects of tunable hydrogel stiffness on endothelial cell (EC) behavior and morphogenesis in 3D.

Main Methods:

  • Incorporated vinyl group moieties into PEGDA hydrogels to interfere with cross-linking.
  • Tuned hydrogel stiffness from <1 kPa to 17 kPa.
  • Encapsulated endothelial cells and EC-pericyte cocultures within the tunable hydrogels.

Main Results:

  • Achieved independent control of hydrogel stiffness (<1-17 kPa) without affecting degradation or permeability.
  • Observed increased EC spreading with decreased hydrogel stiffness, contrasting 2D behavior.
  • Demonstrated rapid formation (3 days) and long-term persistence (4 weeks) of vessel-like networks in compliant hydrogels.

Conclusions:

  • Hydrogel mechanical properties, particularly compliance, significantly regulate endothelial cell morphogenesis in 3D.
  • The developed method provides a versatile platform for creating customizable 3D cell microenvironments with tunable mechanics.