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For cobalt nanoparticles (NPs), soluble ions drive eosinophilic inflammation, while persistent NPs’ surface area drives neutrophilic inflammation. This clarifies NP dose-metrics for toxicity assessments.

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Area of Science:

  • Nanotoxicology
  • Materials Science
  • Environmental Health

Background:

  • Current nanoparticle (NP) dose-metrics, like surface area, are inadequate for high-solubility NPs.
  • Understanding dose-response relationships is crucial for assessing NP toxicity.
  • Cobalt (Co)-based NPs (cobalt monoxide [CoO] and cobalt oxide [Co3O4]) exhibit distinct solubilities.

Purpose of the Study:

  • To evaluate appropriate dose-metrics for NPs with varying solubilities.
  • To determine the role of soluble cobalt ions in NP-induced lung inflammation.
  • To compare the inflammatory responses of CoO and Co3O4 NPs.

Main Methods:

  • Assessed NP physicochemical properties, including solubility in artificial lysosomal fluid (ALF).
  • Evaluated acute lung inflammation using rat intratracheal instillation and bronchoalveolar lavage fluid analysis.
  • Correlated dose-metrics (surface area, soluble ion dose) with inflammation parameters.

Main Results:

  • CoO NPs demonstrated high solubility (92.65%) in ALF, while Co3O4 NPs showed low solubility (11.46%).
  • CoO NPs induced eosinophilic inflammation, correlating with soluble Co ion dose (r²=0.987).
  • Co3O4 NPs induced neutrophilic inflammation, correlating with NP surface area (r²=0.876).

Conclusions:

  • Soluble cobalt ions are the primary driver of eosinophilic inflammation from high-solubility NPs.
  • The surface area of persistent NPs is a relevant metric for neutrophilic inflammation.
  • Distinct dose-metrics are required for NPs based on their solubility and persistence.