The potential involvement of inhaled iron (Fe) in the neurotoxic effects of ultrafine particulate matter air pollution exposure on brain development in mice.

Autor: Sobolewski M; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Conrad K; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Marvin E; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Eckard M; Department of Psychology, Radford University, Radford, VA, 24142, USA., Goeke CM; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Merrill AK; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Welle K; Proteomics Core, University of Rochester Medical Center, Rochester, NY, 14642, USA., Jackson BP; Department of Earth Sciences, Dartmouth College, Hanover, NH, 03755, USA., Gelein R; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Chalupa D; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Oberdörster G; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA., Cory-Slechta DA; Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA. deborah_cory-slechta@urmc.rochester.edu.
Jazyk: angličtina
Zdroj: Particle and fibre toxicology [Part Fibre Toxicol] 2022 Aug 09; Vol. 19 (1), pp. 56. Date of Electronic Publication: 2022 Aug 09.
DOI: 10.1186/s12989-022-00496-5
Abstrakt: Background: Air pollution has been associated with neurodevelopmental disorders in epidemiological studies. In our studies in mice, developmental exposures to ambient ultrafine particulate (UFP) matter either postnatally or gestationally results in neurotoxic consequences that include brain metal dyshomeostasis, including significant increases in brain Fe. Since Fe is redox active and neurotoxic to brain in excess, this study examined the extent to which postnatal Fe inhalation exposure, might contribute to the observed neurotoxicity of UFPs. Mice were exposed to 1 µg/m 3 Fe oxide nanoparticles alone, or in conjunction with sulfur dioxide (Fe (1 µg/m 3 ) + SO 2 (SO 2 at 1.31 mg/m 3 , 500 ppb) from postnatal days 4-7 and 10-13 for 4 h/day.
Results: Overarching results included the observations that Fe + SO 2 produced greater neurotoxicity than did Fe alone, that females appeared to show greater vulnerability to these exposures than did males, and that profiles of effects differed by sex. Consistent with metal dyshomeostasis, both Fe only and Fe + SO 2 exposures altered correlations of Fe and of sulfur (S) with other metals in a sex and tissue-specific manner. Specifically, altered metal levels in lung, but particularly in frontal cortex were found, with reductions produced by Fe in females, but increases produced by Fe + SO 2 in males. At PND14, marked changes in brain frontal cortex and striatal neurotransmitter systems were observed, particularly in response to combined Fe + SO2 as compared to Fe only, in glutamatergic and dopaminergic functions that were of opposite directions by sex. Changes in markers of trans-sulfuration in frontal cortex likewise differed in females as compared to males. Residual neurotransmitter changes were limited at PND60. Increases in serum glutathione and Il-1a were female-specific effects of combined Fe + SO2.
Conclusions: Collectively, these findings suggest a role for the Fe contamination in air pollution in the observed neurotoxicity of ambient UFPs and that such involvement may be different by chemical mixture. Translation of such results to humans requires verification, and, if found, would suggest a need for regulation of Fe in air for public health protection.
(© 2022. The Author(s).)
Databáze: MEDLINE
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