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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Stem Cell Biology

Background:

  • Human-induced pluripotent stem cells (hiPSCs) are valuable for in vitro neurodevelopment studies.
  • Existing models lack tunable biomechanical cues from the extracellular matrix (ECM).
  • The brain ECM is inherently viscoelastic and stress-relaxing.

Purpose of the Study:

  • To engineer protein-based hydrogels with tunable stress relaxation rates.
  • To investigate the impact of microenvironmental viscoelasticity on human neural progenitor cell (NPC) maturation.
  • To recapitulate the remodelability of the native neural ECM.

Main Methods:

  • Development of protein-engineered hydrogels with controlled stress relaxation.
  • Encapsulation of hiPSC-derived NPCs within these hydrogels.
  • Analysis of NPC morphology, metabolic activity, and gene expression.
  • Inhibition of actin polymerization to assess its role.

Main Results:

  • NPCs in faster stress-relaxing hydrogels showed enhanced neuritic projection complexity.
  • Faster stress relaxation correlated with decreased metabolic activity and increased neural maturation gene expression.
  • Inhibition of actin polymerization reduced neuritic outgrowth and neural maturation.

Conclusions:

  • Microenvironmental viscoelasticity is a sufficient cue to influence human NPC maturation.
  • Tunable protein-engineered hydrogels can model neural ECM biomechanics.
  • This approach offers a more physiologically relevant in vitro system for neurodevelopment research.