Biomimetic CaP coating incorporated with parathyroid hormone improves the osseointegration of titanium implant

J Mater Sci Mater Med. 2012 Sep;23(9):2177-86. doi: 10.1007/s10856-012-4682-7. Epub 2012 May 26.

Abstract

Parathyroid hormone (PTH) is a well-known therapeutic agent for osteoporosis treatment, however, the inconvenience of daily administration and side effect from systematic administration severely limits its application in clinic. PTH has been incorporated into a biomimetic calcium phosphate (CaP) coating via a co-precipitation method in a modified simulated body fluid. The aim of the current study is to evaluate the osseointegration response of PTH incorporated CaP coating on titanium implants. Implants with different doses of PTH were inserted into tibiae of mice and evaluated by X-ray, micro-CT, histology and back-scattered scanning electron microscopy. Improved osseointegration of the implants loaded with PTH was observed compared to CaP coating only after 28 days of implantation in mouse tibiae. Micro-CT analysis showed better bone integration around the implant incorporated with PTH. Bone area and bone contact evaluations have demonstrated that peri-implant bone regeneration is highly dependent on the dosage of PTH incorporated. The higher the PTH content, the more bone formed surrounding the implant. Therefore, our results suggest that biomimetic CaP coating could be a useful a carrier for PTH local delivery, which results in improved bone-to-implant integration.

Publication types

  • Evaluation Study
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Biomimetic Materials / chemistry
  • Biomimetic Materials / pharmacology
  • Calcium Phosphates / chemistry
  • Calcium Phosphates / pharmacology*
  • Coated Materials, Biocompatible / chemistry
  • Coated Materials, Biocompatible / pharmacology
  • Dose-Response Relationship, Drug
  • Drug Carriers / chemistry
  • Drug Carriers / pharmacology
  • Humans
  • Mice
  • Osseointegration / drug effects*
  • Parathyroid Hormone / administration & dosage*
  • Prostheses and Implants*
  • Prosthesis Implantation / methods
  • Tibia / drug effects
  • Tibia / metabolism
  • Tibia / physiology
  • Tibia / surgery
  • Titanium / chemistry*
  • Titanium / therapeutic use
  • X-Ray Microtomography

Substances

  • Calcium Phosphates
  • Coated Materials, Biocompatible
  • Drug Carriers
  • Parathyroid Hormone
  • calcium phosphate
  • Titanium