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Inflammatory or Reparative? Tuning Macrophage Polarization Using Anodized Anisotropic Nanoporous Titanium Implant

Ho-Jin Moon1,2, Karan Gulati3,4, Tao Li2,5

  • 1Department of Dental Materials School of Dentistry Kyung Hee University Seoul 02447 Republic of Korea.

Small Science
|April 11, 2025
PubMed
Summary

Nanoscale surface modifications on titanium implants promote healing by reducing harmful M1 macrophage responses and enhancing tissue-repairing M2 macrophages. This nanoengineering improves implant integration and bone cell activity.

Keywords:
anodizationdental implantsmacrophage polarizationmacrophagesnanoporestitanium

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Orthopedic Surgery

Background:

  • Titanium (Ti) implant osseointegration is influenced by macrophage responses to surface characteristics.
  • Excessive M1 macrophage activation can cause detrimental immune-inflammatory reactions, hindering implant success.
  • Nanoscale surface modification is an emerging strategy to modulate macrophage behavior for improved implant outcomes.

Purpose of the Study:

  • To investigate the in vitro effects of anodized titanium surfaces with nanopores on primary macrophage functions.
  • To compare the influence of different nanopore sizes (50 and 70 nm) and surface topographies on macrophage polarization and activity.
  • To assess the impact of these nanoengineered surfaces on osteoclastogenesis and osteoblast differentiation.

Main Methods:

  • Fabrication of anodized titanium implant surfaces with superimposed nanopores (50 and 70 nm) via single-step electrochemical anodization.
  • Comparison of nanoporous surfaces with irregular rough and microrough (machined-like) surfaces.
  • In vitro assessment of primary macrophage proliferation, phenotype polarization (M1 vs. M2), osteoclastogenesis, and osteoblast differentiation.

Main Results:

  • Nanoporous titanium surfaces significantly reduced macrophage proliferation compared to rough surfaces.
  • Increased polarization towards the tissue-reparative M2 macrophage phenotype was observed on nanoporous surfaces, particularly with 70 nm pores.
  • Reduced osteoclastogenesis and enhanced osteogenic differentiation of osteoblasts were noted for nanoporous surfaces, with a more pronounced effect for 70 nm pores.

Conclusions:

  • Nanoengineered titanium surfaces, specifically those with 70 nm nanopores, effectively modulate macrophage responses, promoting an anti-inflammatory and pro-healing environment.
  • These advanced nanoengineered implants enhance tissue integration by optimizing the inflammatory response at the implant-cell interface.
  • Nanoscale surface modification represents a promising approach to improve the long-term success of titanium-based implants.