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Updated: May 13, 2026
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Biological Compatibility Profile on Biomaterials for Bone Regeneration
Published on: November 16, 2018
Early inflammatory response in soft tissues induced by thin calcium phosphates
L Rydén1, D Molnar, M Esposito
1Department of Biomaterials, Sahlgrenska Academy at University of Gothenburg, Göteborg, Sweden.
Journal of Biomedical Materials Research. Part A
|March 7, 2013
Summary
Hydroxyapatite (HA)-coated titanium implants show a reduced inflammatory response compared to uncoated titanium. This suggests HA coatings are promising for soft tissue applications by downregulating inflammatory cell recruitment.
Area of Science:
- Biomaterials Science
- Immunology
- Tissue Engineering
Background:
- The inflammatory response to implants is critical for integration or rejection.
- Monocyte chemoattractant protein-1 (MCP-1) drives monocyte recruitment, which mature into macrophages influencing implant outcomes.
- Early soft tissue inflammatory events around titanium and HA-coated titanium implants are not well understood.
Purpose of the Study:
- To investigate the early soft tissue inflammatory response to titanium and HA-coated titanium implants.
- To compare the effects of crystalline and amorphous HA coatings versus uncoated titanium.
- To analyze key inflammatory markers and cell counts in the exudate.
Main Methods:
- Subcutaneous implantation of titanium and HA-coated titanium discs in rats.
- Explant retrieval at 24 and 72 hours.
- Analysis of lactate dehydrogenase (LD) activity, DNA content, MCP-1, IL-10, TNF-α, and cell counts (monocytes, polymorphonuclear granulocytes).
Main Results:
- Significantly higher DNA and LD levels around titanium implants at 24h compared to HA-coated implants.
- Rapid decrease in MCP-1 levels observed for all implant types over time.
- No significant differences in inflammatory markers between crystalline and amorphous HA coatings.
Conclusions:
- HA-coated titanium implants elicit a reduced early soft tissue inflammatory response compared to uncoated titanium.
- HA coatings downregulate inflammatory cell recruitment to the implant site.
- Thin HA coatings represent a promising surface modification for soft tissue applications.
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