Abstract
Physicochemical properties of nanoparticles are important in regulating nanoparticle toxicity; however, the contribution of nanoparticle charge remains unclear. The objective of this study was to investigate the pulmonary effects of inhalation of charged soot nanoparticles. We established a stably charged nanoparticle generation system for whole-body exposure in BALB/c mice, which produced positively charged, negatively charged, and neutral soot nanoparticles in a wide range of concentrations. After a 7-day exposure, pulmonary toxicity was assessed, together with proteomics analysis. The charged soot nanoparticles on average carried 1.17–1.35 electric charges, and the sizes for nanoparticles under different charging conditions were all fixed at 69 ~ 72 nm. We observed that charged soot nanoparticles induced cytotoxic LDH and increased lung permeability, with the release of 8-isoprostane and caspase-3 and systemic IL-6 in mice, especially for positively charged soot nanoparticles. Next, we observed that positive-charged soot nanoparticles upregulated Eif2, Eif4, sirtuin, mammalian target of rapamycin (mTOR), peroxisome proliferator-activated receptors (PPAR), and HIPPO-related signaling pathways in the lungs compared with negatively charged soot nanoparticles. HIF1α, sirt1, E-cadherin, and Yap were increased in mice’s lungs by positively charged soot nanoparticle exposure. In conclusion, carbonaceous nanoparticles carrying electric ions, especially positive-charged, are particularly toxic when inhaled and should be of concern in terms of pulmonary health protection.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors wish to thank Miss Yi-Syuan Lin for the technical assistance of this research. The authors acknowledge the mass spectrometry technical research services of NTU Consortia of Key Technologies. KF Chung is a Visiting Professor at Taipei Medical University.
Funding
This study was funded by the Ministry of Science and Technology of Taiwan (109–2314-B-038–093-MY3, 110–2113-M-038–001-MY3, and 111–2314-B-038–079).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by TCH, CLH, TTY, YFS, YTJ, CHL YLL, and JHC. The first draft of the manuscript was written by TCH, KFC, HPK, and HCC, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Hsiao, TC., Han, CL., Yang, TT. et al. Importance of surface charge of soot nanoparticles in determining inhalation toxicity in mice. Environ Sci Pollut Res 30, 18985–18997 (2023). https://doi.org/10.1007/s11356-022-23444-4
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DOI: https://doi.org/10.1007/s11356-022-23444-4