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Development and Optimisation of Hydrogel Scaffolds for Microvascular Network Formation.

Carla V Fuenteslópez1, Mark S Thompson1, Hua Ye1

  • 1Institute of Biomedical Engineering, University of Oxford, Oxford OX3 7DQ, UK.

Bioengineering (Basel, Switzerland)
|August 26, 2023
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Summary

Researchers developed an optimal in vitro construct for microvascular traumatic injury research. Fibrin hydrogels at 3-5% concentrations effectively supported the formation of capillary-like networks, advancing traumatic injury studies.

Keywords:
collagenfibringelatinehydrogelmicrovascular networktissue engineering scaffoldtraumatic injury

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Microvascular Research

Background:

  • Traumatic injuries are a significant global health concern, leading to substantial morbidity and mortality.
  • Research into microvascular traumatic injuries remains limited, highlighting a critical gap in understanding.
  • Developing suitable in vitro models is essential for studying these injuries at the microvascular level.

Purpose of the Study:

  • To develop and optimize an in vitro construct for researching microvascular traumatic injuries.
  • To evaluate various hydrogel compositions for their suitability in mimicking microvascular environments.
  • To identify the optimal hydrogel formulation that supports endothelial cell function and network formation.

Main Methods:

  • Tissue engineering constructs were fabricated using collagen, fibrin, and gelatine hydrogels at varying concentrations (1-5% w/v) and solvents.
  • Human Umbilical Vein Endothelial Cells (HUVECs) were incorporated into the hydrogels.
  • Constructs were evaluated based on cell proliferation, adhesion, migration, viability, hydrogel properties, and tube formation.

Main Results:

  • Fibrin and collagen hydrogels showed comparable or superior cell adhesion compared to controls, while gelatine hydrogels had lower adhesion.
  • Fibrin scaffolds, especially at higher concentrations, demonstrated excellent hydrogel consistency and shape retention.
  • Fibrin hydrogels (3% and 5% w/v) in serum-free media successfully facilitated the formation of interconnected capillary-like networks with similar architectures.

Conclusions:

  • Fibrin hydrogels represent a promising biomaterial for developing in vitro models of microvascular traumatic injury.
  • The optimized fibrin constructs support endothelial cell network formation, crucial for studying microvascular responses to trauma.
  • This research provides a valuable tool for advancing the understanding and treatment of microvascular complications from traumatic injuries.