Abstract
Amorphous silica nanoparticles are widely used as pharmaceutical excipients and food additive (E551). Despite the potential human health risks of mineral nanoparticles, very few data regarding their oral toxicity are currently available. This study aims to evaluate and to understand the interactions of silica particles at 1 and 10 mg mL−1 with the intestinal barrier using a Caco-2 monolayer and a Caco-2/HT29-MTX co-culture. A size- and concentration-dependent reversible increase of the paracellular permeability is identified after a short-term exposure to silica nanoparticles. Nanoparticles of 30 nm induce the highest transepithelial electrical resistance drop whereas no effect is observed with 200 nm particles. Additive E551 affect the Caco-2 monolayer permeability. Mucus layer reduces the permeability modulation by limiting the cellular uptake of silica. After nanoparticle exposure, tight junction expression including Zonula occludens 1 (ZO-1) and Claudin 2 is not affected, whereas the actin cytoskeleton disruption of enterocytes and the widening of ZO-1 staining bands are observed. A complete permeability recovery is concomitant with the de novo filament actin assembly and the reduction of ZO-1 bands. These findings suggest the paracellular modulation by small silica particles is directly correlated to the alteration of the ZO-actin binding strongly involved in the stability of the tight junction network.
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Acknowledgements
Raphaël Cornu is supported by a fellowship from the “Communauté d’Agglomération du Grand Besançon (CAGB)”. We thank DImaCell microscopy facilities, especially M. Tissot for her technical assistance (Plateforme DImaCell, Univ. Bourgogne Franche-Comté, F-25000 Besançon, France). The authors thank FHU InCREASe for the Oral Communication Award and the financial support.
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Cornu, R., Chrétien, C., Pellequer, Y. et al. Small silica nanoparticles transiently modulate the intestinal permeability by actin cytoskeleton disruption in both Caco-2 and Caco-2/HT29-MTX models. Arch Toxicol 94, 1191–1202 (2020). https://doi.org/10.1007/s00204-020-02694-6
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DOI: https://doi.org/10.1007/s00204-020-02694-6