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Related Experiment Video

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Microcapsules and 3D customizable shelled microenvironments from laser direct-written microbeads.

David M Kingsley1, Andrew D Dias1, David T Corr2

  • 1Department of Biomedical Engineering, Rensselaer Polytechnic Institute, 110 Eighth St., Troy, New York 12180.

Biotechnology and Bioengineering
|April 13, 2016
PubMed
Summary

Laser direct-write printing precisely controls microcapsule size and placement for tissue engineering. This novel method enables the creation of intricate 3D hydrogel structures with custom cell arrangements for regenerative medicine applications.

Keywords:
alginatelaser direct-writemicrobeadmicrocapsulemicropatterningmicrostrand

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Microcapsules offer controlled microenvironments for cell growth and substance release.
  • Conventional methods lack precise control over microcapsule size and spatial arrangement.
  • Limitations in current fabrication hinder advanced applications in tissue engineering.

Purpose of the Study:

  • To demonstrate size and spatial control of poly-l-lysine and chitosan microcapsules using laser direct-write (LDW) printing.
  • To utilize microbeads as volume pixels (voxels) for fabricating continuous 3D hydrogel structures.
  • To create heterogeneous structures with controlled cell placement for studying cell signaling.

Main Methods:

  • Laser direct-write (LDW) printing of alginate microbeads for poly-l-lysine and chitosan microcapsules.
  • Processing of microbeads as voxels to form custom 3D hydrogel structures (strands, rings, bifurcations).
  • Fabrication of heterogeneous structures with defined initial locations of different cell types.

Main Results:

  • Achieved precise control over microcapsule size and spatial placement.
  • Successfully formed continuous 3D hydrogel constructs with prescribed geometries.
  • Demonstrated the ability to create heterogeneous cell distributions for controlled cell signaling in co-cultures.
  • Showcased LDW's capability for intricate 3D structure fabrication with "printed macroporosity".

Conclusions:

  • LDW printing offers unprecedented structural and compositional control in microcapsule fabrication.
  • Bottom-up, bead-by-bead assembly enables precise control over construct design.
  • This technology facilitates the creation of novel constructs with broad potential in tissue engineering and regenerative medicine.