Skeletal Site-specific Effects of Zoledronate on in vivo Bone Remodeling and in vitro BMSCs Osteogenic Activity

Sci Rep. 2017 Jan 31:7:36129. doi: 10.1038/srep36129.

Abstract

Bisphosphonate-related osteonecrosis of the jaw (BRONJ) has been associated with long-term oral or intravenous administration of nitrogen-containing bisphosphonates (BPs). However, the pathogenesis of BRONJ remains unknown, and definitively effective treatment has not yet been established. Bisphosphonate-related osteonecrosis (BRON) tends to occur in maxillofacial bones. Why this occurs is still unclear. Here we show that zoledronate (Zol) treatment suppresses alveolar bone remodeling after tooth typical clinical and radiographic hallmarks of the human BRONJ, whereas enhances peripheral bone quantity in bone remodeling following injury in the same individuals, shown as increased cortical bone thickness, increased trabecular bone formation and accelerated bone defect repair. We find that the RANKL/OPG ratio and Wnt-3a expression are suppressed at the extracted alveolar sites in Zol-treated rats compared with those at the injured sites of peripheral bones. We also show that Zol-treated bone marrow stromal cell (BMSCs) derived from jaw and peripheral bones exhibit differences in cell proliferation, alkaline phosphatase (ALP) activity, expression of osteogenic and chondrogenic related marker genes, and in vivo bone formation capacity. Hopefully, this study will help us better understand the pathogenesis of BRONJ, and deepen the theoretical research.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alveolar Bone Loss / drug therapy*
  • Animals
  • Bisphosphonate-Associated Osteonecrosis of the Jaw / drug therapy*
  • Bone Density Conservation Agents / therapeutic use*
  • Bone Remodeling
  • Cell Proliferation / drug effects
  • Cells, Cultured
  • Diphosphonates / administration & dosage
  • Diphosphonates / therapeutic use*
  • Disease Models, Animal
  • Female
  • Gene Expression Regulation
  • Humans
  • Imidazoles / therapeutic use*
  • Maxilla / pathology*
  • Maxilla / surgery
  • Mesenchymal Stem Cells / drug effects
  • Mesenchymal Stem Cells / pathology*
  • Osteoprotegerin / metabolism
  • RANK Ligand / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Wnt3A Protein / genetics
  • Wnt3A Protein / metabolism
  • Zoledronic Acid

Substances

  • Bone Density Conservation Agents
  • Diphosphonates
  • Imidazoles
  • Osteoprotegerin
  • RANK Ligand
  • Wnt3A Protein
  • Zoledronic Acid