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Hydrogel-based reinforcement of 3D bioprinted constructs.

F P W Melchels1, M M Blokzijl1,2, R Levato1

  • 1Department of Orthopaedics, University Medical Center Utrecht, PO Box 85500, 3508 GA Utrecht, The Netherlands.

Biofabrication
|July 20, 2016
PubMed
Summary

This study introduces a novel hybrid bioprinting technique using a reinforcing hydrogel and bioink. This method enables the creation of cellularized 3D constructs with tunable properties for tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • 3D Bioprinting

Background:

  • Biofabrication progress is limited by the availability of suitable hydrogel formulations.
  • Current methods often use thermoplastics, which are not ideal for cell encapsulation and soft tissue printing.

Purpose of the Study:

  • To develop a novel hybrid bioprinting strategy using a hydrogel-based reinforcing gel and bioink.
  • To create cellularized 3D printed constructs with enhanced cytocompatibility and tunable mechanical properties.

Main Methods:

  • A hybrid bioprinting approach combining a poloxamer-based reinforcing gel with gelatin-methacryloyl bioink.
  • Preparation of hydrolysable, covalently cross-linked polymer networks for the reinforcing gel.
  • Encapsulation of equine chondrocytes within the 3D printed constructs.

Main Results:

  • The hybrid system allows printing at cell-friendly temperatures, suitable for softer tissues.
  • Cell viability of encapsulated equine chondrocytes was largely unaffected by the printing process.
  • Tunable construct stiffness (138–263 kPa) and degradation kinetics (weeks to over a year) were achieved.

Conclusions:

  • The developed hydrogel-based hybrid bioprinting strategy offers a versatile platform for creating advanced cellularized 3D constructs.
  • This approach overcomes limitations of traditional methods, enabling better control over mechanical properties and degradation for tissue engineering.