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Microfluidic-enabled bottom-up hydrogels from annealable naturally-derived protein microbeads.

Amir Sheikhi1, Joseph de Rutte2, Reihaneh Haghniaz1

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Biomaterials
|December 12, 2018
PubMed
Summary

Researchers developed novel 3D scaffolds using Gelatin methacryloyl (GelMA) beads. These beaded GelMA (B-GelMA) scaffolds offer tunable stiffness and porosity for advanced tissue engineering applications.

Keywords:
3D cell seedingGelatin methacryloyl (GelMA)MicrobeadsMicroporous scaffoldsModular hydrogelsParticle gels

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Naturally-derived proteins like gelatin are promising for tissue engineering.
  • Gelatin methacryloyl (GelMA) is a versatile scaffold material but has limitations in stiffness and porosity for certain 3D applications.
  • High concentrations of bulk GelMA (>10 wt%) create stiff scaffolds with small pores, hindering 3D cellular engineering.

Purpose of the Study:

  • To develop a novel 3D scaffold with decoupled stiffness and porosity using GelMA.
  • To overcome the limitations of coupled stiffness and porosity in bulk GelMA for demanding 3D applications.
  • To create a versatile platform for tissue engineering and regenerative medicine.

Main Methods:

  • Microfluidic-assisted fabrication of annealable GelMA beads.
  • Temperature-mediated physical crosslinking for initial stabilization.
  • Light-induced chemical annealing to form robust 3D bead-based scaffolds (B-GelMA).
  • Incorporation of methacryloyl and arginylglycylaspartic acid (RGD) peptide motifs.

Main Results:

  • Fabrication of bead-based GelMA (B-GelMA) scaffolds with high mechanical resilience at high polymer concentrations (∼20 wt%).
  • B-GelMA scaffolds exhibit orthogonal void fraction and stiffness, enabling rapid 3D cell seeding.
  • The scaffolds promote cell adhesion and proliferation without additional functionalization.
  • Demonstrated a universal method to create beaded hydrogels (B-hydrogels) with decoupled porosity and stiffness.

Conclusions:

  • Beaded GelMA (B-GelMA) scaffolds provide a tunable and resilient 3D microenvironment for biomedical applications.
  • This technology enables the creation of advanced hydrogel platforms with independent control over porosity and stiffness.
  • The B-GelMA system offers a versatile solution for tissue engineering, bioprinting, and organoid development.