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National Institute of Environmental Health Sciences

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Your Environment. Your Health.

Publication Detail

Title: Equivalent titanium dioxide nanoparticle deposition by intratracheal instillation and whole body inhalation: the effect of dose rate on acute respiratory tract inflammation.

Authors: Baisch, Brittany L; Corson, Nancy M; Wade-Mercer, Pamela; Gelein, Robert; Kennell, Andrea J; Oberdörster, Günter; Elder, Alison

Published In Part Fibre Toxicol, (2014 Jan 24)

Abstract: The increased production of nanomaterials has caused a corresponding increase in concern about human exposures in consumer and occupational settings. Studies in rodents have evaluated dose-response relationships following respiratory tract (RT) delivery of nanoparticles (NPs) in order to identify potential hazards. However, these studies often use bolus methods that deliver NPs at high dose rates that do not reflect real world exposures and do not measure the actual deposited dose of NPs. We hypothesize that the delivered dose rate is a key determinant of the inflammatory response in the RT when the deposited dose is constant.F-344 rats were exposed to the same deposited doses of titanium dioxide (TiO₂) NPs by single or repeated high dose rate intratracheal instillation or low dose rate whole body aerosol inhalation. Controls were exposed to saline or filtered air. Bronchoalveolar lavage fluid (BALF) neutrophils, biochemical parameters and inflammatory mediator release were quantified 4, 8, and 24 hr and 7 days after exposure.Although the initial lung burdens of TiO₂ were the same between the two methods, instillation resulted in greater short term retention than inhalation. There was a statistically significant increase in BALF neutrophils at 4, 8 and 24 hr after the single high dose TiO₂ instillation compared to saline controls and to TiO₂ inhalation, whereas TiO₂ inhalation resulted in a modest, yet significant, increase in BALF neutrophils 24 hr after exposure. The acute inflammatory response following instillation was driven primarily by monocyte chemoattractant protein-1 and macrophage inflammatory protein-2, mainly within the lung. Increases in heme oxygenase-1 in the lung were also higher following instillation than inhalation. TiO₂ inhalation resulted in few time dependent changes in the inflammatory mediator release. The single low dose and repeated exposure scenarios had similar BALF cellular and mediator response trends, although the responses for single exposures were more robust.High dose rate NP delivery elicits significantly greater inflammation compared to low dose rate delivery. Although high dose rate methods can be used for quantitative ranking of NP hazards, these data caution against their use for quantitative risk assessment.

PubMed ID: 24456852 Exiting the NIEHS site

MeSH Terms: Administration, Inhalation; Animals; Body Burden; Bronchoalveolar Lavage Fluid/cytology; Inflammation/chemically induced; Inflammation/metabolism; Inflammation/pathology; Inhalation Exposure; Intubation, Intratracheal; Lung/cytology; Lung/metabolism; Male; Nanoparticles/administration & dosage; Nanoparticles/metabolism*; Neutrophil Infiltration/drug effects; Oxidative Stress/drug effects; Particle Size; Pneumonia/chemically induced; Pneumonia/pathology; Rats; Rats, Inbred F344; Respiratory Tract Diseases/chemically induced; Respiratory Tract Diseases/metabolism; Respiratory Tract Diseases/pathology*; Risk Assessment; Solubility; Therapeutic Irrigation; Titanium/pharmacokinetics*

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