Size-Dependent Toxicity Differences of Intratracheally Instilled Manganese Oxide Nanoparticles: Conclusions of a Subacute Animal Experiment

Zsuzsanna Máté, Edina Horváth, Gábor Kozma, Tímea Simon, Z. Kónya, Edit Paulik, A. Papp, A. Szabó

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Incomplete information on toxicological differences of micro- and nanometer-sized particles raised concerns about the effects of the latter on health and environment. Besides chemical composition, size and surface-to-volume ratio of nanoparticles (NPs) can affect toxicity. To investigate size-dependent toxicity differences, we used particles made of dioxide of the neurotoxic heavy metal manganese (Mn), typically found in inhaled metal fumes, in three size ranges (size A, 9.14 ± 1.98 nm; size B, 42.36 ± 8.06 nm; size C, 118.31 ± 25.37 nm). For modeling the most frequent route of exposure to Mn, NPs were given to rats for 6 weeks by intratracheal instillation. Of each NP size, 3 or 6 mg/kg body weight was given while control animals were vehicle treated. Neurotoxicity was assessed by measuring spontaneous locomotor activity in an open field and by recording spontaneous and evoked electrical activity from the somatosensory cortical area. Mn content of brain, lung, and blood, measured by ICP-MS, were correlated to the observed functional alterations to see the relationship between Mn load and toxic effects. Body weight gain and organ weights were measured as general toxicological indices. The toxicity of size A and size B NPs proved to be stronger compared to size C NPs, seen most clearly in decreased body weight gain and altered spontaneous cortical activity, which were also well correlated to the internal Mn dose. Our results showed strong effect of size on NP toxicity, thus, beyond inappropriateness of toxicity data of micrometer-sized particles in evaluation of NP exposure, differentiation within the nano range may be necessary.

Original languageEnglish
JournalBiological Trace Element Research
DOIs
Publication statusAccepted/In press - Sep 18 2015

Fingerprint

Nanoparticles
Toxicity
Animals
Manganese
Experiments
Body Weight
Toxicology
Weight Gain
Fumes
Organ Size
Poisons
Locomotion
Heavy Metals
manganese oxide
Rats
Brain
Blood
Metals
Health
Lung

Keywords

  • Intratracheal
  • Manganese
  • Neurotoxicity
  • Rat
  • Toxicity

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Inorganic Chemistry
  • Biochemistry, medical
  • Endocrinology, Diabetes and Metabolism

Cite this

Size-Dependent Toxicity Differences of Intratracheally Instilled Manganese Oxide Nanoparticles : Conclusions of a Subacute Animal Experiment. / Máté, Zsuzsanna; Horváth, Edina; Kozma, Gábor; Simon, Tímea; Kónya, Z.; Paulik, Edit; Papp, A.; Szabó, A.

In: Biological Trace Element Research, 18.09.2015.

Research output: Contribution to journalArticle

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