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Particle length-dependent titanium dioxide nanomaterials toxicity and bioactivity.

Raymond F Hamilton1, Nianqiang Wu, Dale Porter

  • 1Center for Environmental Health Sciences, University of Montana, Missoula MT, USA.

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Altering titanium dioxide (TiO(2)) nanomaterials into long, fiber-like structures dramatically increases their toxicity. These TiO(2) nanobelts trigger inflammatory responses in lung cells, similar to asbestos.

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Area of Science:

  • Nanomaterial science
  • Toxicology
  • Biomedical engineering

Background:

  • Titanium dioxide (TiO(2)) nanomaterials are widely used in applications like photocatalysis and solar cells.
  • Pigment-grade TiO(2) spheres are generally considered biologically inert.
  • Nanoscale metal oxides may exhibit different toxicological profiles compared to their bulk counterparts, especially when structurally modified.

Purpose of the Study:

  • To investigate the biological activity and toxicity of engineered titanium dioxide (TiO(2)) nanomaterials.
  • To compare the effects of different TiO(2) nanostructures on biological systems.
  • To understand how structural modifications influence nanomaterial toxicity.

Main Methods:

  • Synthesis and characterization of TiO(2) nanospheres and nanobelts (short and long).
  • Testing biological activity using primary murine alveolar macrophages.
  • In vivo studies in mice to assess inflammatory responses.

Main Results:

  • Alteration of TiO(2) into long nanobelts (>15 µm) resulted in highly toxic particles.
  • These fiber-shaped nanomaterials induced inflammasome activation and inflammatory cytokine release.
  • The mechanism involved cathepsin B, leading to lysosomal disruption and macrophage interaction similar to asbestos or silica.

Conclusions:

  • Modification of nanomaterial shape, particularly into fibrous structures, can drastically alter toxicity.
  • Any engineered nanomaterial with wire, fiber, belt, or tube morphology requires thorough testing for pathogenic potential.
  • Phagocytic cells struggle to process altered shapes, leading to cellular damage and inflammation.