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Lung exposure of titanium dioxide nanoparticles induces innate immune activation and long-lasting lymphocyte response in the Dark Agouti rat
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science.
2011 (English)In: Journal of Immunotoxicology, ISSN 1547-691X, Vol. 8, no 2, 111-121 p.Article in journal (Refereed) Published
Abstract [en]

Nanomaterial of titanium dioxide (TiO2) is manufactured in large-scale production plants, resulting in risks for accidental high exposures of humans. Inhalation of metal oxide nanoparticles in high doses may lead to both acute and long-standing adverse effects. By using the Dark Agouti (DA) rat, a strain disposed to develop chronic inflammation following exposure to immunoactivating adjuvants, we investigated local and systemic inflammatory responses after lung exposure of nanosized TiO2 particles up to 90 days after intratracheal instillation. TiO2 induced a transient response of proinflammatory and T-cell-activating cytokines (interleukin [IL]-1 alpha alpha, IL-1 beta beta, IL-6, cytokine-induced neutrophil chemoattractant [CINC]-1, granulocyte--macrophage colony-stimulating factor [GM-CSF], and IL-2) in airways 1--2 days after exposure, accompanied by an influx of eosinophils and neutrophils. Neutrophil numbers remained elevated for 30 days, whereas the eosinophils declined to baseline levels at Day 8, simultaneously with an increase of dendritic cells and natural killer (NK) cells. The innate immune activation was followed by a lymphocyte expansion that persisted throughout the 90-day study. Lymphocytes recruited to the lungs were predominantly CD4<SU++</SU helper T-cells, but we also demonstrated presence of CD8<SU++</SU T-cells, B-cells, and CD25<SU++</SU T-cells. In serum, we detected both an early cytokine expression at Days 1--2 (IL-2, IL-4, IL-6, CINC-1, IL-10, and interferon-gamma [IFN-gamma gamma] and a second response at Day 16 of tumor necrosis factor-alpha (TNF-alpha alpha), indicating systemic late-phase effects in addition to the local response in airways. In summary, these data demonstrate a dynamic response to TiO2 nanoparticles in the lungs of DA rats, beginning with an innate immune activation of eosinophils, neutrophils, dendritic cells, and NK cells, followed by a long-lasting activation of lymphocytes involved in adaptive immunity. The results have implications for the assessment of risks for adverse and persistent immune stimulation following nanoparticle exposures in sensitive populations.</.

Place, publisher, year, edition, pages
2011. Vol. 8, no 2, 111-121 p.
Keyword [en]
Nanoparticles, TiO2, lung, inflammation, NK cells, T-cells, dendritic cells
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-154005DOI: 10.3109/1547691X.2010.546382ISI: 000290167000002PubMedID: 21309687OAI: oai:DiVA.org:uu-154005DiVA: diva2:418621
Available from: 2011-05-23 Created: 2011-05-23Bibliographically approved

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