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Immobilizing hydroxycholesterol with apatite on titanium surfaces to induce ossification.

Cen Chen1, Hyeong Cheol Yang2, In-Seop Lee3

  • 1Bio-X Center, College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou, 310018 China.

Biomaterials Research
|September 3, 2015
PubMed
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Hydroxycholesterol (HC) immobilized with apatite on titanium implants enhanced bone ossification. This biomaterial coating shows potential for improving bone healing and implant integration.

Keywords:
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Area of Science:

  • Biomaterials Science
  • Orthopedic Research
  • Tissue Engineering

Background:

  • Titanium implants are crucial in orthopedics, but direct ossification can be limited.
  • Osteoconductive apatite coatings aim to improve implant integration.
  • Bioactive molecules can be incorporated to enhance bone formation.

Purpose of the Study:

  • To investigate the effect of immobilizing hydroxycholesterol (HC) with apatite on titanium implants.
  • To evaluate three types of HC: 20α-HC, 22(S)-HC, and 25-HC.
  • To assess the ossification capabilities of HC/apatite coatings in vitro and in vivo.

Main Methods:

  • Adsorption and sandwich-like coating techniques were used to immobilize HC with apatite on titanium.
  • In vitro cytotoxicity and alkaline phosphatase (ALP) activity assays were performed.
  • In vivo mineral deposition was evaluated to assess ossification.

Main Results:

  • Apatite/20α-HC coating showed good cell viability, while other HC coatings exhibited some cytotoxicity initially.
  • Immobilizing HC with apatite significantly increased ALP activity compared to apatite alone.
  • In vivo studies demonstrated improved mineral deposition with HC/apatite coatings, especially at higher concentrations.

Conclusions:

  • Immobilizing hydroxycholesterol with apatite on titanium implants effectively induces ossification.
  • HC/apatite coatings represent a promising strategy for enhancing bone formation around implants.
  • The findings suggest potential for improved implant osseoinntegration and bone regeneration.