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Related Experiment Video

Updated: Jul 29, 2025

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Arrhenius-model-based degradable oligourethane hydrogels for controlled growth factor release.

Eric Tawagi1, Trevor Ung2, Hai-Ling Margaret Cheng3

  • 1Institute of Biomedical Engineering, University of Toronto, 661 University Avenue, 14th Floor, Room 1435, Toronto, ON M5G 1M1, Canada; Translational Biology & Engineering Program, Ted Rogers Centre for Heart Research, Toronto, ON, Canada.

Acta Biomaterialia
|May 19, 2023
PubMed
Summary

Biodegradable oligourethane/polyacrylic acid hydrogels show promise for regenerative medicine. These materials support tissue regeneration, controlled growth factor release, and exhibit low cytotoxicity, integrating well in vivo with minimal inflammation.

Keywords:
Accelerated erosionForeign body reactionGrowth factor carrierM2 macrophageOligourethane hydrogelVEGF

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Polymer Chemistry

Background:

  • Biodegradable hydrogels are crucial for delivering biomolecules in regenerative medicine.
  • Oligourethane/polyacrylic acid hydrogels offer potential for tissue regeneration and biomolecule delivery.

Purpose of the Study:

  • To investigate the resorption characteristics of oligourethane/polyacrylic acid hydrogels.
  • To evaluate the hydrogels' potential for controlled growth factor release and tissue integration.

Main Methods:

  • Utilized the Arrhenius model to characterize hydrogel resorption in vitro.
  • Employed the Flory-Rehner equation to correlate swelling ratio with degradation.
  • Assessed cytotoxicity, cell proliferation, growth factor release kinetics (VEGF), and in vivo foreign body response in a rat model.

Main Results:

  • Hydrogel swelling rate followed the Arrhenius model, predicting degradation in saline at 37°C between 5-13 months.
  • Degradation products showed low cytotoxicity; hydrogels supported stromal cell proliferation.
  • Controlled and sustained release of vascular endothelial growth factor (VEGF) over three weeks was achieved.
  • In vivo, hydrogels demonstrated minimal foreign body response, supported M2a macrophage phenotype, and promoted vascularization, indicating tissue integration.

Conclusions:

  • Oligourethane/polyacrylic acid hydrogels are promising for growth factor delivery and tissue regeneration.
  • The hydrogel's degradation rate can be tailored by chemical formulation.
  • These hydrogels exhibit favorable biocompatibility and promote tissue integration, minimizing inflammatory responses.