Mesoporous silica nanoparticles/hydroxyapatite composite coated implants to locally inhibit osteoclastic activity

ACS Appl Mater Interfaces. 2014 Apr 23;6(8):5456-66. doi: 10.1021/am405013t. Epub 2014 Apr 7.

Abstract

In an attempt to improve implant-bone integration and accelerate bone fracture healing from resisting osteoclastic resorption point of view, we have employed a novel procedure to develop a mesoporous silica nanoparticles/hydroxyapatite (MSNs/HA) composite coating onto stainless Kirschner wire substrate. Characterizations of the surface microstructures indicated enlarged specific surface area compared to HA-coated wires as control, thus the MSNs/HA composite coated implants are endowed with abilities to locally deliver biomedical substances and enhance fracture healing. Herein, zoledronic acid (ZOL) as a model drug, different doses of which were immobilized in the mesoporous coating toward decreasing osteoclastic resorption activity. The loading capacities of ZOL increased almost eight-folds to that of pure HA coating, and the introduction of MSNs obviously retarded ZOL release to achieve a more sustained release profile. After certain periods of osteoclast like cells co-culturing with ZOL contained wires, tartrat-resistant acid phosphatases (TRAP) staining of polynucleated cells and a pit formation assay were performed to investigate the ZOL dose-dependent anti-resorption activity. The promoted local effect on osteoclasts will be of clinical benefit to support implant integration and bone repair.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bone Resorption / drug therapy*
  • Bone Wires
  • Coated Materials, Biocompatible / chemistry*
  • Diphosphonates / chemistry
  • Diphosphonates / pharmacology*
  • Drug Carriers / chemistry
  • Durapatite / chemistry*
  • Humans
  • Imidazoles / chemistry
  • Imidazoles / pharmacology*
  • Nanoparticles / chemistry*
  • Osteoclasts / drug effects
  • Osteoclasts / physiology*
  • Porosity
  • Prostheses and Implants
  • Silicon Dioxide / chemistry*
  • Zoledronic Acid

Substances

  • Coated Materials, Biocompatible
  • Diphosphonates
  • Drug Carriers
  • Imidazoles
  • Zoledronic Acid
  • Silicon Dioxide
  • Durapatite