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Osteoclast differentiation and formation induced by titanium implantation through complement C3a.

Xiaohan Liu1, Siwen Li1, Yuan Meng2

  • 1Department of Oral Pathology, School and Hospital of Stomatology, China Medical University, Shenyang, 110002, China; Department of Prosthodontics, School and Hospital of Stomatology, China Medical University, Shenyang, 110002, China; Liaoning Provincial Key Laboratory of Oral Diseases, China Medical University, Shenyang, 110002, China.

Materials Science & Engineering. C, Materials for Biological Applications
|March 1, 2021
PubMed
Summary

The complement C3a fragment, not C3b, drives osteoclast activation and bone loss around titanium dental implants. Blocking C3a may prevent implant failure and bone resorption.

Keywords:
Complement C3aInflammatory reactionOsteoclast differentiationOsteoclast formationTitanium implantation

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Oral Biology

Background:

  • Titanium implants are common for dental replacement due to favorable properties.
  • Implant failure can occur due to bone resorption linked to inflammation, with unclear mechanisms.

Purpose of the Study:

  • To elucidate the mechanisms of inflammation and bone resorption around titanium implants.
  • To identify key molecular players involved in titanium-induced osteoclastogenesis.

Main Methods:

  • Analysis of inflammatory responses and osteoclast activity near titanium implants.
  • Measurement of complement C3 levels and activation pathways (classical and alternative).
  • Investigating the role of C3a/C3aR signaling in cytokine production (TNF-α, MMP9) via NF-kB and NFATc1.

Main Results:

  • Inflammatory responses and increased osteoclasts were observed near implants.
  • Elevated C3 levels, activated via classical and alternative pathways, were detected.
  • C3a/C3aR signaling, not C3b, stimulated pro-inflammatory cytokines and osteoclast differentiation, leading to bone resorption.

Conclusions:

  • Cleaved C3a fragment plays a critical role in activating osteoclasts and causing bone resorption around titanium implants.
  • Blocking C3a activation presents a potential therapeutic strategy to prevent bone loss and improve implant survival.