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Bifunctional hydrogel for potential vascularized bone tissue regeneration.

Bipin Gaihre1, Xifeng Liu1, Linli Li1

  • 1Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, United States; Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, United States.

Materials Science & Engineering. C, Materials for Biological Applications
|May 5, 2021
PubMed
Summary

This study developed a novel biomimetic poly(ethylene glycol) hydrogel for bone tissue engineering. The functionalized hydrogel promotes mineralization and vascularization, enhancing osteogenic and angiogenic activities for improved bone regeneration.

Keywords:
AngiogenesisEnzymatic mineralizationFG-4592HydrogelPhosphorylation

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Synthetic polymer hydrogels often lack intrinsic properties for effective tissue engineering.
  • Bone tissue engineering (BTE) requires materials that support osteogenesis and vascularization.
  • Existing methods for hydrogel mineralization have limitations in uniformity.

Purpose of the Study:

  • To develop a biomimetic poly(ethylene glycol) (PEG)-based hydrogel for bone tissue engineering.
  • To induce mineralization and vascularization within the hydrogel matrix.
  • To evaluate the osteogenic and angiogenic potential of the functionalized hydrogel.

Main Methods:

  • Covalent functionalization of oligo[poly(ethylene glycol) fumarate] (OPF) with phosphate groups.
  • Enzymatic mineralization using alkaline phosphatase (ALP) and calcium.
  • Functionalization with FG-4592, a hypoxia-mimicking molecule, to promote vascularization.
  • In vitro cell culture studies with MC3T3-E1 and human umbilical vein endothelial cells (HUVEC).
  • In vivo subcutaneous implantation in rats to assess vascularization and calcification.

Main Results:

  • Uniform mineralization of the OPF hydrogel was achieved by modifying the base polymer with phosphate groups.
  • Mineralized hydrogels showed improved mechanical properties, enhanced cell attachment, proliferation, and mesenchymal stem cell (MSC) differentiation.
  • Hydrogels functionalized with FG-4592 demonstrated upregulated in vitro angiogenic activity of HUVECs.
  • In vivo studies showed enhanced early vascularization and later formation of calcified tissues at the implantation site.

Conclusions:

  • The developed bifunctional OPF hydrogels offer a promising platform for vascularized bone tissue engineering.
  • The biomimetic approach successfully integrates mineralization and vascularization capabilities into a single hydrogel system.
  • This strategy addresses key challenges in BTE by providing a material that supports both bone formation and blood vessel development.