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Shape-defined solid micro-objects from poly(d,l-lactic acid) as cell-supportive counterparts in bottom-up tissue

A M Leferink1,2,3, M P Tibbe2,3, E G B M Bossink2

  • 1Applied Stem Cell Technologies Group, TechMed Centre, University of Twente, 7500 AE, Enschede, the Netherlands.

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Summary
This summary is machine-generated.

Researchers developed a novel method to create microscale objects from biopolymers for tissue engineering. These cell-adhesive objects enable the bottom-up assembly of complex tissues, showing potential for vascularized tissue development.

Keywords:
Bone tissue engineeringHot embossing/thermal imprintingHuman bone marrow stromal cellsHuman umbilical vein endothelial cellsPoly(lactic acid)Self-assembly

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Biotechnology

Background:

  • Bottom-up tissue engineering constructs larger tissues from smaller units.
  • Existing methods often use toxic photoinitiators.

Purpose of the Study:

  • To present a novel, non-toxic method for fabricating microscale objects for tissue engineering.
  • To evaluate the use of these micro-objects in cell-guided tissue assembly and vascularization.

Main Methods:

  • Fabrication of micro-objects from biopolymers using thermal imprinting on water-soluble sacrificial layers.
  • Utilizing micro-objects as cell-adhesive substrates and spacers in engineered tissues.
  • Assessing cell viability and aggregation behavior in cell-micro-object constructs.
  • Engineering vascularized tissue constructs using human bone marrow stromal cells (hMSCs) and human umbilical vein endothelial cells (HUVECs).

Main Results:

  • Geometrically well-defined micro-objects were produced without toxic photoinitiators.
  • Cell-micro-object constructs maintained viability for up to 2 weeks.
  • Aggregation behavior depended on cell type and number.
  • Demonstrated potential for engineering vascularized tissues with HUVEC-rich interfaces.

Conclusions:

  • The novel thermal imprinting method offers a non-toxic approach to creating micro-objects for bottom-up tissue engineering.
  • These micro-objects facilitate cell-guided assembly and support the development of complex, potentially vascularized tissue constructs.
  • The technology holds promise for both in vitro studies and clinical applications in regenerative medicine.