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"In vitro" comparative immune effects of different titanium compounds.
L Di Giampaolo1, M Di Gioacchino, J Ponti
1Department of Medicine and Science or Ageing, Section of Occupational Medicine, Allergy and Clinical Immunology, G. D'Annunzio University, Chieti, Italy.
International Journal of Immunopathology and Pharmacology
|September 4, 2004
Summary
Titanium (Ti) compounds pose health risks. This study found Ti oxalate and Ti ascorbate inhibit immune cell proliferation, while Ti dioxide is safe. Immunotoxicity depends on the specific titanium compound.
Area of Science:
- Immunotoxicology
- Environmental Health
- Materials Science
Background:
- Titanium (Ti) compounds are prevalent in occupational and environmental settings, raising health concerns.
- Understanding the immunotoxicological effects of different Ti species is crucial for risk assessment.
Purpose of the Study:
- To investigate the in vitro effects of various Ti salts on human peripheral blood mononuclear cell (PBMC) proliferation and cytokine release.
- To assess the immunotoxicity of Ti dioxide, Ti oxalate, Ti ascorbate, and titanocene.
Main Methods:
- Human PBMCs were cultured and exposed to different concentrations (10(-4) M and 10(-7) M) of Ti compounds.
- PBMC proliferation was measured, along with the release of cytokines like Interferon-gamma (IFN-gamma) and Tumor Necrosis Factor-alpha (TNF-alpha).
- Phytohemagglutinin (PHA) stimulation was used to assess immune cell responses.
Main Results:
- Ti dioxide showed no impact on PBMC proliferation or cytokine release.
- Ti oxalate and Ti ascorbate significantly inhibited PHA-stimulated PBMC proliferation by approximately 70%.
- Ti oxalate, Ti ascorbate, and titanocene demonstrated significant inhibition of TNF-alpha release, while Ti oxalate and titanocene also inhibited IFN-gamma release.
Conclusions:
- Titanium immunotoxicity is highly dependent on its chemical form (speciation).
- Ti dioxide is not immunotoxic, whereas Ti oxalate exhibits marked immunotoxicity.
- Titanocene selectively affects cytokine release, and Ti ascorbate impacts TNF-alpha release, highlighting differential toxicological profiles.