AI Article Synopsis
- - Iron nanoparticles (Fe3O4 NPs), primarily found in heavily trafficked areas, may enter the brain via the olfactory nerve or bloodstream, potentially leading to neurodegenerative effects.
- - The study aimed to analyze the toxicity and interaction of these particles with primary rat brain microvascular endothelial cells (rBMECs), which are crucial for in vitro blood-brain barrier models.
- - Findings revealed that synthetic pollution-derived Fe3O4 NPs could be internalized by rBMECs and cross the cell layer, with lower concentrations causing mid-level cytotoxic effects on cell membrane integrity and metabolic activity.
Article Abstract
Background: Iron nanoparticles, mainly in magnetite phase (Fe3O4 NPs), are released to the environment in areas with high traffic density and braking frequency. Fe3O4 NPs were found in postmortem human brains and are assumed to get directly into the brain through the olfactory nerve. However, these pollution-derived NPs may also translocate from the lungs to the bloodstream and then, through the blood-brain barrier (BBB), into the brain inducing oxidative and inflammatory responses that contribute to neurodegeneration.
Objective: To describe the interaction and toxicity of pollution-derived Fe3O4 NPs on primary rat brain microvascular endothelial cells (rBMECs), main constituents of in vitro BBB models.
Methods: Synthetic bare Fe3O4 NPs that mimic the environmental ones (miFe3O4) were synthesized by co-precipitation and characterized using complementary techniques. The rBMECs were cultured in Transwell® plates. The NPs-cell interaction was evaluated through transmission electron microscopy and standard colorimetric in vitro assays.
Results: The miFe3O4 NPs, with a mean diameter of 8.45±0.14 nm, presented both magnetite and maghemite phases, and showed super-paramagnetic properties. Results suggest that miFe3O4 NPs are internalized by rBMECs through endocytosis and that they are able to cross the cells monolayer. The lowest miFe3O4 NPs concentration tested induced mid cytotoxicity in terms of 1) membrane integrity (LDH release) and 2) metabolic activity (MTS transformation).
Conclusion: Pollution-derived Fe3O4 NPs may interact and cross the microvascular endothelial cells forming the BBB and cause biological damage.
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| http://dx.doi.org/10.3233/JAD-190929 | DOI Listing |
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