Efficacy of simple short-term in vitro assays for predicting the potential of metal oxide nanoparticles to cause pulmonary inflammation
Lu, Senlin and Duffin, Rodger and Poland, Craig and Daly, Paul and Murphy, Fiona and Drost, Ellen and MacNee, William and Stone, Vicki and Donaldson, Ken (2009) Efficacy of simple short-term in vitro assays for predicting the potential of metal oxide nanoparticles to cause pulmonary inflammation. Environmental Health Perspectives, 117 (2). pp. 241-247. ISSN 0091-6765 (https://doi.org/10.1289/ehp.11811)
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Abstract
Background: There has been concern regarding risks from inhalation exposure to nanoparticles (NPs). The large number of particles requiring testing means that alternative approaches to animal testing are needed. Objectives: We set out to determine whether short-term in vitro assays that assess intrinsic oxidative stress potential and membrane-damaging potency of a panel of metal oxide NPs can be used to predict their inflammogenic potency. Methods: For a panel of metal oxide NPs, we investigated intrinsic free radical generation, oxidative activity in an extracellular environment, cytotoxicity to lung epithelial cells, hemolysis, and inflammation potency in rat lungs. All exposures were carried out at equal surface area doses. Results: Only nickel oxide (NiO) and alumina 2 caused significant lung inflammation when instilled into rat lungs at equal surface area, suggesting that these two had extra surface reactivity. We observed significant free radical generation with 4 of 13 metal oxides, only one of which was inflammogenic. Only 3 of 13 were significantly hemolytic, two of which were inflammogenic. Conclusions: Potency in generating free radicals in vitro did not predict inflammation, whereas alumina 2 had no free radical activity but was inflammogenic. The hemolysis assay was correct in predicting the proinflammatory potential of 12 of 13 of the particles examined. Using a battery of simple in vitro tests, it is possible to predict the inflammogenicity of metal oxide NPs, although some false-positive results are likely. More research using a larger panel is needed to confirm the efficacy and generality of this approach for metal oxide NPs.
ORCID iDs
Lu, Senlin, Duffin, Rodger, Poland, Craig, Daly, Paul, Murphy, Fiona ORCID: https://orcid.org/0000-0001-7925-0632, Drost, Ellen, MacNee, William, Stone, Vicki and Donaldson, Ken;-
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Item type: Article ID code: 83536 Dates: DateEvent1 February 2009Published17 September 2008Published Online16 September 2008AcceptedSubjects: Medicine > Public aspects of medicine > Public health. Hygiene. Preventive Medicine Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences Depositing user: Pure Administrator Date deposited: 15 Dec 2022 11:55 Last modified: 25 Sep 2024 20:59 URI: https://strathprints.strath.ac.uk/id/eprint/83536