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Related Experiment Videos

Bioresponsive phosphoester hydrogels for bone tissue engineering.

Dong-An Wang1, Christopher G Williams, Fan Yang

  • 1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Tissue Engineering
|March 2, 2005
PubMed
Summary

New phosphoester-poly(ethylene glycol) (PhosPEG) hydrogels promote bone tissue engineering. These innovative biomaterials enhance mesenchymal stem cell differentiation into bone cells, increasing bone-specific marker expression and mineralization without growth factors.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Stem Cell Biology

Background:

  • Bioresponsive and intelligent biomaterials are crucial for manipulating cell function in tissue development and engineering.
  • Marrow-derived mesenchymal stem cells (MSCs) are key cells for bone tissue engineering.
  • Developing advanced hydrogels is essential for effective MSC encapsulation and bone regeneration.

Purpose of the Study:

  • To synthesize and characterize a novel photopolymerized hydrogel based on a phosphoester-poly(ethylene glycol) (PhosPEG) polymer.
  • To evaluate the potential of PhosPEG hydrogels for bone tissue engineering by encapsulating MSCs.
  • To investigate the effect of PhosPEG hydrogels on MSC differentiation and bone matrix formation.

Main Methods:

  • Synthesis of a photopolymerized hydrogel using a phosphoester-poly(ethylene glycol) (PhosPEG) polymer.

Related Experiment Videos

  • Encapsulation of marrow-derived mesenchymal stem cells (MSCs) within PhosPEG-poly(ethylene glycol) (PEG) cogels.
  • Analysis of MSC gene expression and protein secretion for bone-specific markers.
  • Assessment of hydrogel degradation in the presence of alkaline phosphatase.
  • Evaluation of mineralization in both cellular and acellular constructs.

    • Main Results:

    • PhosPEG hydrogels exhibited hydrolytic degradability, with degradation rate increasing in the presence of alkaline phosphatase.
    • Intermediate phosphorus concentrations in PhosPEG-PEG cogels significantly promoted gene expression of bone-specific markers (type I collagen, alkaline phosphatase, osteonectin) in MSCs.
    • Secretion of bone-related proteins (alkaline phosphatase, osteocalcin, osteonectin) was enhanced in PhosPEG cogels.
    • Increased mineralization was observed in PhosPEG hydrogels compared to pure PEG gels, in both cellular and acellular conditions.

    Conclusions:

    • Phosphate-PEG-derived hydrogels effectively support MSCs for bone tissue engineering applications.
    • These hydrogels enhance bone-specific gene expression, protein secretion, and mineralization without requiring external growth factors.
    • PhosPEG hydrogels show significant potential for advancing bone-engineering therapies and regenerative medicine.