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Engineered cobalt oxide nanoparticles readily enter cells.

Elena Papis1, Federica Rossi, Mario Raspanti

  • 1Department of Biotechnology and Molecular Science, Insubria University, Varese, Italy.

Toxicology Letters
|June 23, 2009
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Summary

Cobalt oxide nanoparticles (Co3O4-NPs) show toxicity and induce reactive oxygen species (ROS) in human cells. While cobalt ions are more toxic, Co3O4-NPs rapidly generate ROS and enter cells.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Toxicology
  • Biomedical Engineering

Background:

  • Cobalt-based nanoparticles (Co3O4-NPs) offer promising applications in catalysis, energy storage, and biomedicine.
  • However, their safety profile requires thorough investigation due to potential toxicity concerns.

Purpose of the Study:

  • To characterize Co3O4-NPs and assess their biological effects, including toxicity and cellular uptake.
  • To determine if cobalt ion release contributes to the observed biological activity.
  • To compare the toxicity of Co3O4-NPs with cobalt chloride (CoCl2) and their effects on reactive oxygen species (ROS) generation.

Main Methods:

  • Physicochemical characterization of Co3O4-NPs using atomic force and electron microscopy.
  • Assessment of spontaneous cobalt ion dissolution in various media.
  • Evaluation of cell viability and ROS production in human cell lines exposed to Co3O4-NPs and CoCl2.
  • Investigation of cellular uptake mechanisms and localization of Co3O4-NPs.

Main Results:

  • Co3O4-NPs induced concentration- and time-dependent decreases in cell viability, though cobalt ions were more potent toxicants.
  • Co3O4-NPs triggered a rapid induction of ROS, more so than equivalent cobalt ions.
  • Co3O4-NPs were rapidly internalized by cells, primarily residing in cytoplasmic vesicles, with some nuclear presence.

Conclusions:

  • Co3O4-NPs exhibit significant toxicity and ROS-inducing potential in human cells.
  • While cobalt ions are more cytotoxic, the rapid ROS generation by Co3O4-NPs is a key factor in their biological impact.
  • Understanding NP internalization and intracellular fate is crucial for assessing nanoparticle safety and applications.