Pulmonary toxicity of well-dispersed cerium oxide nanoparticles following intratracheal instillation and inhalation
Source abstract
Abstract
We performed inhalation and intratracheal instillation studies of cerium dioxide (CeO 2 ) nanoparticles in order to investigate their pulmonary toxicity, and observed pulmonary inflammation not only in the acute and but also in the chronic phases. In the intratracheal instillation study, F344 rats were exposed to 0.2 mg or 1 mg of CeO 2 nanoparticles. Cell analysis and chemokines in bronchoalveolar lavage fluid (BALF) were analyzed from 3 days to 6 months following the instillation. In the inhalation study, rats were exposed to the maximum concentration of inhaled CeO 2 nanoparticles (2, 10 mg/m 3 , respectively) for 4 weeks (6 h/day, 5 days/week). The same endpoints as in the intratracheal instillation study were examined from 3 days to 3 months after the end of the exposure. The intratracheal instillation of CeO 2 nanoparticles caused a persistent increase in the total and neutrophil number in BALF and in the concentration of cytokine-induced neutrophil chemoattractant (CINC)-1, CINC-2, chemokine for neutrophil, and heme oxygenase-1 (HO-1), an oxidative stress marker, in BALF during the observation time. The inhalation of CeO 2 nanoparticles also induced a persistent influx of neutrophils and expression of CINC-1, CINC-2, and HO-1 in BALF. Pathological features revealed that inflammatory cells, including macrophages and neutrophils, invaded the alveolar space in both studies. Taken together, the CeO 2 nanoparticles induced not only acute but also chronic inflammation in the lung, suggesting that CeO 2 nanoparticles have a pulmonary toxicity that can lead to irreversible lesions.
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Research context
OpenAlex topics: Advanced Nanomaterials in Catalysis · Nanoparticles: synthesis and applications · Air Quality and Health Impacts
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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