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Essential Minerals for Bone Health01:31

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Surface electric fields increase osteoblast adhesion through improved wettability on hydroxyapatite electret.

Miho Nakamura1, Akiko Nagai, Teuvo Hentunen

  • 1Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo 1010062, Japan. miho.bcr@tmd.ac.jp

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Electrical polarization of hydroxyapatite (HA) enhances osteoblast adhesion and spreading. Electrically polarized HA surfaces are more hydrophilic, promoting better cell attachment and cytoskeletal organization for bone regeneration applications.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Surface Chemistry

Background:

  • Osteoblast response is influenced by bioceramic surface properties and external stimuli.
  • Understanding cell-material interactions is crucial for developing effective bone regeneration scaffolds.

Purpose of the Study:

  • To investigate the impact of electrical polarization on bioceramic surface characteristics.
  • To evaluate the effects of electrically polarized surfaces on osteoblast adhesion and morphology.

Main Methods:

  • Electrical polarization applied to hydroxyapatite (HA) surfaces, creating negatively (N-HA) and positively (P-HA) charged variants.
  • Surface characterization using contact-angle measurements for hydrophilicity.
  • Osteoblast adhesion and spreading assessed via morphological observation and actin staining.

Main Results:

  • Electrical polarization did not alter HA surface roughness, crystallinity, or elemental composition.
  • Electrically polarized HA (N-HA and P-HA) exhibited increased hydrophilicity compared to normal HA (O-HA).
  • Osteoblasts showed enhanced spindle/fan-like spreading on N-HA and P-HA compared to round shapes on O-HA, with larger cell areas and focal adhesions.

Conclusions:

  • Electrical polarization significantly improves osteoblast adhesion and spreading on HA surfaces.
  • Enhanced hydrophilicity of polarized HA contributes to improved cell-material interactions.
  • Electrically polarized HA holds potential for enhancing bone regeneration therapies.