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Pulmonary pathogenesis in a murine model of inhaled arsenical exposure

  • Inorganic Compounds
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Abstract

Arsenic trioxide (ATO), an inorganic arsenical, is a toxic environmental contaminant. It is also a widely used chemical with industrial and medicinal uses. Significant public health risk exists from its intentional or accidental exposure. The pulmonary pathology of acute high dose exposure is not well defined. We developed and characterized a murine model of a single inhaled exposure to ATO, which was evaluated 24 h post-exposure. ATO caused hypoxemia as demonstrated by arterial blood-gas measurements. ATO administration caused disruption of alveolar-capillary membrane as shown by increase in total protein and IgM in the bronchoalveolar lavage fluid (BALF) supernatant and an onset of pulmonary edema. BALF of ATO-exposed mice had increased HMGB1, a damage-associated molecular pattern (DAMP) molecule, and differential cell counts revealed increased neutrophils. BALF supernatant also showed an increase in protein levels of eotaxin/CCL-11 and MCP-3/CCL-7 and a reduction in IL-10, IL-19, IFN-γ, and IL-2. In the lung of ATO-exposed mice, increased protein levels of G-CSF, CXCL-5, and CCL-11 were noted. Increased mRNA levels of TNF-a, and CCL2 in ATO-challenged lungs further supported an inflammatory pathogenesis. Neutrophils were increased in the blood of ATO-exposed animals. Pulmonary function was also evaluated using flexiVent. Consistent with an acute lung injury phenotype, respiratory and lung elastance showed significant increase in ATO-exposed mice. PV loops showed a downward shift and a decrease in inspiratory capacity in the ATO mice. Flow-volume curves showed a decrease in FEV0.1 and FEF50. These results demonstrate that inhaled ATO leads to pulmonary damage and characteristic dysfunctions resembling ARDS in humans.

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Data presented in this study are available from the corresponding author upon reasonable request.

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Funding

Funding by the CounterACT Program grants, National Institutes of Health Office of the Director (NIH OD), the National Institute of Environmental Health Sciences (NIEHS) Grants U54ES030246 (MA, AfA, VA, AnA), U01ES025069 (AfA), U01ES028182 (SA), U01AR078544 (MA), U01ES033263 (SA), and R21ES030525 (SA) are gratefully acknowledged.

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Correspondence to Aftab Ahmad.

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At the time of the study, AR was employed by SCIREQ Inc., a commercial entity with interests in topics related to the content of the present work. SCIREQ Inc. is an emka TECHNOLOGIES company. All the other authors declare that they have no conflict of interest.

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Mariappan, N., Zafar, I., Robichaud, A. et al. Pulmonary pathogenesis in a murine model of inhaled arsenical exposure. Arch Toxicol 97, 1847–1858 (2023). https://doi.org/10.1007/s00204-023-03503-6

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  • DOI: https://doi.org/10.1007/s00204-023-03503-6

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