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Physiologically based pharmacokinetic modeling of nanoceria systemic distribution in rats suggests dose- and route-dependent biokinetics

Authors Carlander U, Moto TP, Desalegn AA, Yokel RA, Johanson G

Received 16 November 2017

Accepted for publication 6 January 2018

Published 1 May 2018 Volume 2018:13 Pages 2631—2646


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Dr Thomas Webster

Ulrika Carlander,1 Tshepo Paulsen Moto,2 Anteneh Assefa Desalegn,1 Robert A Yokel,3 Gunnar Johanson1

1Unit of Work Environment Toxicology, Institute of Environmental Medicine, Karolinska Institutet, Solna, Sweden; 2Faculty of Health Sciences, School of Health Systems and Public Health, University of Pretoria, Pretoria, South Africa; 3Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, USA

Background: Cerium dioxide nanoparticles (nanoceria) are increasingly being used in a variety of products as catalysts, coatings, and polishing agents. Furthermore, their antioxidant properties make nanoceria potential candidates for biomedical applications. To predict and avoid toxicity, information about their biokinetics is essential. A useful tool to explore such associations between exposure and internal target dose is physiologically based pharmacokinetic (PBPK) modeling. The aim of this study was to test the appropriateness of our previously published PBPK model developed for intravenous (IV) administration when applied to various sizes of nanoceria and to exposure routes relevant for humans.
Methods: Experimental biokinetic data on nanoceria (obtained from various exposure routes, sizes, coatings, doses, and tissues sampled) in rats were collected from the literature and also obtained from the researchers. The PBPK model was first calibrated and validated against IV data for 30 nm citrate coated ceria and then recalibrated for 5 nm ceria. Finally, the model was modified and tested against inhalation, intratracheal (IT) instillation, and oral nanoceria data.
Results: The PBPK model adequately described nanoceria time courses in various tissues for 5 nm ceria given IV. The time courses of 30 nm ceria were reasonably well predicted for liver and spleen, whereas the biokinetics in other tissues were not well captured. For the inhalation, IT instillation, and oral exposure routes, re-optimization was difficult due to low absorption and, hence, low and variable nanoceria tissue levels. Moreover, the nanoceria properties and exposure conditions varied widely among the inhalation, IT instillation, and oral studies, making it difficult to assess the importance of different factors.
Conclusion: Overall, our modeling efforts suggest that nanoceria biokinetics depend largely on the exposure route and dose.

Keywords: biodistribution, cerium dioxide, inhalation, instillation, intravenous, oral

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