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• W3024120856 endingPage "152491" @default.
• W3024120856 startingPage "152491" @default.
• W3024120856 abstract "Multi-walled carbon nanotubes (MWCNTs) have promising applications in neurology depending on their unique physicochemical properties. However, there is limited understanding of their impacts on brain microvascular endothelial cells, the cells lining the vessels and maintaining the low and selective permeability of the blood-brain barrier. In this study, we examined the influence of pristine MWCNT (p-MWCNT) and carboxylated MWCNT (c-MWCNT) on permeability and tight junction tightness of murine brain microvascular endothelial cells, and investigated the potential mechanisms in the sight of hemichannel activity. Treatment with p-MWCNT for 24 h at subtoxic concentration (20 μg/mL) decreased the protein expression of occludin, disrupted zonula occludens-1 continuity, and elevated monolayer permeability as quantified by transendothelial electrical resistance and paracellular flux of 4000 Da fluorescein isothiocyanate-dextran conjugates. Moreover, p-MWCNT exposure also increased hemichannel activity with upregulated protein expression and altered subcellular localization of connexin (Cx)43 and pannexin (Panx)1. p-MWCNT-induced elevation in endothelial permeability could be prevented by hemichannel inhibitor carbenoxolone and peptide blocker of Cx43 and Panx1, indicating the crucial role of activated Cx43 and Panx1 hemichannels. Furthermore, Cx43 and Panx1 hemichannel-mediated ATP release might be involved in p-MWCNT-induced rise in endothelial permeability. In contrast, the above effects caused by p-MWCNT were not observed in cells treated with c-MWCNT, the functionalized form with more stable dispersion and a lower tendency to aggregate. Our study contributes further understanding of the impact of MWCNTs on brain endothelial tightness and permeability, which may have important implications for the safety application of MWCNTs in nanomedicine." @default.
• W3024120856 created "2020-05-21" @default.
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• W3024120856 date "2020-07-01" @default.
• W3024120856 modified "2023-10-12" @default.
• W3024120856 title "Paracellular permeability changes induced by multi-walled carbon nanotubes in brain endothelial cells and associated roles of hemichannels" @default.
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• W3024120856 doi "https://doi.org/10.1016/j.tox.2020.152491" @default.
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