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Published on: February 10, 2014
Preliminary Findings on the Role of Sclerostin in the Osseointegration Process Around Titanium Implants
Purpose:
Studies have recognized the importance of Wnt/β-catenin signals in osteoblastogenesis. Sclerostin is a glycoprotein product of the SOST gene that inhibits Wnt/β-catenin signaling and reduces osteoblastogenesis. To date, there is little evidence regarding the role of the Wnt/β-catenin pathway and its inhibitors in the osseointegration process. Therefore, the aim of this study was to evaluate the expression of sclerostin in bone healing around titanium implants inserted in rats.
Materials And Methods:
Fifteen Wistar rats received an implant with primary stability in a tibia, while the contralateral tibia received an implant without primary stability, representing experimental models of implant success and failure, respectively. Animals were then euthanized 7, 14, or 21 days later (five each day). Immunohistochemistry was used to evaluate the specimens for sclerostin-positive cells.
Results:
The proportion of cells positive for sclerostin was significantly higher around implants without primary stability than those with primary stability at 7 and 14 days after implant placement (P < .05). There were no differences between groups for the proportion of cells positive for sclerostin at 21 days after implant insertion (P > .05).
Conclusion:
Sclerostin expression is upregulated around implants inserted without primary stability, in comparison with that around implants inserted with primary stability, in the tibia of rats. This preliminary evidence reinforces the importance of primary implant stability from the biologic viewpoint.
Insights
Sclerostin expression, a Wnt/β-catenin inhibitor, was higher around titanium implants lacking primary stability in rats. This suggests sclerostin
Area of Science:
- Biomaterials Science
- Orthopedics
- Cell Biology
Background:
- Wnt/β-catenin signaling is crucial for osteoblastogenesis.
- Sclerostin, a SOST gene product, inhibits Wnt/β-catenin signaling and osteoblastogenesis.
- The role of Wnt/β-catenin pathway and its inhibitors in osseointegration is not well understood.
Purpose of the Study:
- To investigate the expression of sclerostin in bone healing around titanium implants in a rat model.
- To assess the relationship between primary implant stability and sclerostin expression during osseointegration.
Main Methods:
- Titanium implants were inserted into the tibias of Wistar rats, with one leg achieving primary stability and the contralateral leg lacking it.
- Animals were euthanized at 7, 14, and 21 days post-implantation.
- Immunohistochemistry was employed to quantify sclerostin-positive cells around the implants.
Main Results:
- A significantly higher proportion of sclerostin-positive cells were observed around implants without primary stability compared to those with primary stability at 7 and 14 days (P < .05).
- No significant difference in sclerostin expression was found between groups at 21 days post-implantation (P > .05).
Conclusions:
- Sclerostin expression is upregulated in the early stages of bone healing around implants that lack primary stability.
- These findings highlight the biological significance of achieving primary implant stability for successful osseointegration.
