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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Related Experiment Video

Updated: May 3, 2026

Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering
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Nanohydroxyapatite shape and its potential role in bone formation: an analytical study.

Priya Kalia1, Gema Vizcay-Barrena, Jian Ping Fan

  • 1Biomaterials, Biomimetics and Biophotonics Division, Dental Institute, King's College London, , Tower Wing, Guy's Hospital, London SE1 9RT, UK.

Journal of the Royal Society, Interface
|January 31, 2014
PubMed
Summary

Hydroxyapatite nanoparticle shape significantly impacts bone cell activity and viability. Rounder nanoparticles (AR2) showed better osteogenic effects and cell survival compared to rice-shaped ones (AR4).

Keywords:
bonehydroxyapatitenanoparticlestransmission electron microscopy

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Nanotechnology

Background:

  • Bone cells, osteoblasts, produce an extracellular matrix (osteoid) mineralized by calcium phosphate (CaP).
  • Synthetic CaP nanoparticles (NPs) show clinical potential, but their effects on osteoblasts vary with properties like shape.
  • Limited research compares CaP NP shapes, specifically hydroxyapatite (HA NPs), on primary human osteoblast (HOB) survival and behavior.

Purpose of the Study:

  • To investigate the biocompatibility and ultrastructural effects of two HA NP shapes on HOBs.
  • To compare the influence of round (AR2) and rice-shaped (AR4) HA NPs on osteoblast activity, matrix formation, and viability.

Main Methods:

  • Cultured primary human osteoblasts (HOBs) were exposed to round (AR2) and rice-shaped (AR4) HA NPs.
  • Ultrastructural responses, extracellular matrix (ECM) formation, and matrix vesicle release were observed.
  • Transmission electron microscopy (TEM)-based X-ray microanalysis measured cytoplasmic ion levels (Ca, P, Na, K) to assess cell viability (K/Na ratio).

Main Results:

  • Both HA NP shapes increased cytoplasmic ion levels; AR2 NPs demonstrated a greater osteogenic effect (alkaline phosphatase activity, matrix vesicle release) than AR4 NPs.
  • Cell viability, assessed by K/Na ratios, was best maintained with AR2 NPs.
  • ECM formation was altered by both HA NP shapes, with fibronectin and matrilin-3 identified as affected proteins; matrilin-3 expression by osteoblasts is newly described.

Conclusions:

  • HA NP shape significantly influences osteoblast viability and activity.
  • Rounder HA NPs (AR2) exhibit superior osteogenic potential and cell viability compared to rice-shaped HA NPs (AR4).
  • Specific intracellular Ca and P concentrations may be critical for optimal osteoblast function.