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Growth factor-loaded scaffolds for bone engineering.

J A Jansen1, J W M Vehof, P Q Ruhé

  • 1Department of Periodontology and Biomaterials, University Medical Center, THK 117, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands. j.jansen@dent.umcn.nl

Journal of Controlled Release : Official Journal of the Controlled Release Society
|December 14, 2004
PubMed
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This study compared growth factor release from Ti-fiber mesh and CaP cement scaffolds. Both scaffolds enhanced bone formation, but CaP cement showed slower release kinetics, differing from Ti-fiber mesh.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Orthopedics

Background:

  • Scaffold materials play a crucial role in bone regeneration.
  • Controlling the release of growth factors from scaffolds is essential for effective bone induction.

Purpose of the Study:

  • To investigate the bone inductive properties and release kinetics of recombinant human transforming growth factor-beta1 (rhTGF-beta1) and recombinant human bone morphogenetic protein-2 (rhBMP-2) loaded Ti-fiber mesh and calcium phosphate (CaP) cement scaffolds.
  • To compare the in vitro release profiles and in vivo bone formation stimulated by these loaded scaffolds.

Main Methods:

  • Ti-fiber mesh and porous CaP cement scaffolds were loaded with rhTGF-beta1 and rhBMP-2.
  • Scaffolds were implanted subcutaneously and cranially in rats and rabbits.

Related Experiment Videos

  • In vitro release kinetics were analyzed.
  • Histological analysis and quantification of bone ingrowth were performed.

    • Main Results:

    • Ti-fiber mesh scaffolds exhibited a rapid initial release of rhTGF-beta1 (>50% within 2h).
    • CaP cement scaffolds showed a slow, sustained release of growth factors with minimal initial burst.
    • Both scaffold types loaded with rhTGF-beta1 and rhBMP-2 significantly increased bone formation compared to non-loaded controls.
    • Non-loaded CaP cement and Ti-mesh showed excellent osteoconductive properties and bone ingrowth, respectively.

    Conclusions:

    • Release kinetics of growth factors differ significantly between CaP cement and Ti-fiber mesh scaffolds.
    • Both rhTGF-beta1 and rhBMP-2 loaded scaffolds effectively stimulate orthotopic bone formation.
    • CaP cement's sustained release profile may offer advantages for specific bone regeneration applications.