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Related Concept Videos

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Related Experiment Video

Updated: Feb 16, 2026

Three-dimensional Tissue Engineered Aligned Astrocyte Networks to Recapitulate Developmental Mechanisms and Facilitate Nervous System Regeneration
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Endothelial cells assemble into a 3-dimensional prevascular network in a bone tissue engineering construct.

Jeroen Rouwkema1, Jan de Boer, Clemens A Van Blitterswijk

  • 1Institute for Biomedical Technology, University of Twente, Prof. Bronkhorstlaan 10D, Bilthoven 3723MB, the Netherlands. j.rouwkema@tnw.utwente.nl

Tissue Engineering
|September 26, 2006
PubMed
Summary

Endothelial cells and osteoprogenitor cells can form a 3D prevascular network in vitro for bone tissue engineering. This in vitro prevascularization shows promise for improving implant vascularization.

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Area of Science:

  • Tissue Engineering
  • Biomedical Engineering
  • Regenerative Medicine

Background:

  • Clinically relevant tissue engineering requires functional vasculature for nutrient and waste transport.
  • Rapidly creating blood vessels is a significant challenge in engineering large-dimension tissues.

Purpose of the Study:

  • To test if endothelial cells, cocultured with osteoprogenitor cells, can form a prevascular network in vitro.
  • To evaluate the potential of in vitro prevascularization for bone tissue engineering applications.

Main Methods:

  • Human umbilical vein endothelial cells (HUVECs) were cocultured with human mesenchymal stem cells in a spheroid model.
  • The impact of HUVEC seeding density on network formation was assessed.
  • Osteogenic marker expression and in vivo performance after implantation were analyzed.

Main Results:

  • HUVECs formed a 3D prevascular network within 10 days of in vitro culture.
  • Optimal network formation occurred with 2% or fewer HUVECs.
  • Endothelial cell addition upregulated alkaline phosphatase, an osteogenic marker, by 4-fold.
  • Implanted networks showed further development but limited anastomosis with host vasculature.

Conclusions:

  • Endothelial cells can form a 3D prevascular network in vitro within a bone tissue engineering context.
  • In vitro prevascularization is a promising strategy to enhance vascularization of bone tissue engineering implants.
  • Further research is needed to improve host vascular integration.