Comparative characteristics of porous bioceramics for an osteogenic response in vitro and in vivo

PLoS One. 2013 Dec 31;8(12):e84272. doi: 10.1371/journal.pone.0084272. eCollection 2013.

Abstract

Porous calcium phosphate ceramics are used in orthopedic and craniofacial applications to treat bone loss, or in dental applications to replace missing teeth. The implantation of these materials, however, does not induce stem cell differentiation, so suitable additional materials such as porous calcium phosphate discs are needed to influence physicochemical responses or structural changes. Rabbit adipose-derived stem cells (ADSC) and mouse osteoblastic cells (MC3T3-E1) were evaluated in vitro by the MTT assay, semi-quantitative RT-PCR, and immunoblotting using cells cultured in medium supplemented with extracts from bioceramics, including calcium metaphosphate (CMP), hydroxyapatite (HA) and collagen-grafted HA (HA-col). In vivo evaluation of the bone forming capacity of these bioceramics in rat models using femur defects and intramuscular implants for 12 weeks was performed. Histological analysis showed that newly formed stromal-rich tissues were observed in all the implanted regions and that the implants showed positive immunoreaction against type I collagen and alkaline phosphatase (ALP). The intramuscular implant region, in particular, showed strong positive immunoreactivity for both type I collagen and ALP, which was further confirmed by mRNA expression and immunoblotting results, indicating that each bioceramic material enhanced osteogenesis stimulation. These results support our hypothesis that smart bioceramics can induce osteoconduction and osteoinduction in vivo, although mature bone formation, including lacunae, osteocytes, and mineralization, was not prominent until 12 weeks after implantation.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adipose Tissue / cytology
  • Animals
  • Biocompatible Materials / chemistry*
  • Calcium Phosphates / chemistry*
  • Calcium Phosphates / metabolism
  • Cell Culture Techniques / methods*
  • Ceramics / chemistry*
  • Culture Media / analysis
  • Durapatite / metabolism
  • Immunoblotting
  • Immunohistochemistry
  • Mice
  • Osteoblasts / metabolism
  • Osteogenesis / physiology*
  • Porosity
  • Rabbits
  • Rats
  • Reverse Transcriptase Polymerase Chain Reaction
  • Spectrophotometry, Atomic
  • Stem Cells / metabolism
  • Tetrazolium Salts
  • Thiazoles

Substances

  • Biocompatible Materials
  • Calcium Phosphates
  • Culture Media
  • Tetrazolium Salts
  • Thiazoles
  • Durapatite
  • calcium phosphate
  • thiazolyl blue

Grants and funding

This study was supported by grants of the Nano-Biotechnology Project (Regenomics), Ministry of Science and Technology, Republic of Korea (B020214), and by Bio-industry Technology Development Program (312062-5) of iPET (Korea Institute of Planning and Evaluation for Technology in Food, Agriculature, Forestry and Fisherires), Ministry for Food, Agriculture, Forestry and Fisheries, Republic of Korea. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.