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• W2079449153 abstract "Monocytes play important roles in inflammatory responses and vascular remodeling after vascular stenting. This research focused on impacts of nickel (Ni) ions released from a corroded cardiovascular stent on cytotoxicity and monocyte activation.A human promonocytic (macrophage-like) cell line (U937) was exposed to graduated concentrations of Ni(2+)in vitro. Cells were observed and harvested at indicated times to determine the effects using histological and biochemical methods.Ni caused U937 cell death in dose- and time-dependent manners. In vitro, high concentrations of Ni(2+) (>240 μM) significantly induced cell apoptosis and increased terminal deoxynucleotidyl transferase (TdT) dUTP nick end labeling (TUNEL)-positive cells according to flow cytometric surveillance and triggered apoptotic cell death. Although no significant changes in Bcl-2 or Bax expressions were detected after 24 hours of Ni(2+) treatment, increasing cleavage of caspase-3 and -8 was present. Results showed that cleavage of caspase-8 was inhibited by the presence of the inhibitor, Z-IETD-FMK, and this suggested the presence of Ni(2+)-induced U937 cell death through a death receptor-mediated pathway. Simultaneously, when treated with a high concentration of Ni(2+) ions, expressions of the vascular remodeling factors, matrix metalloproteinases (MMP)-9 and -2, were activated in dose- and time-dependent manners. Secretion of the proliferative factor, monocyte chemoattractant protein (MCP)-1, significantly increased during the first 6 hours of incubation with 480 μM Ni(2+)-treated medium.Our results demonstrated that a high concentration of Ni ions causes apoptotic cell death of circulating monocytes. They may also play different roles in vascular remodeling during the corrosion process following implantation of Ni alloy-containing devices." @default.
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• W2079449153 date "2015-11-01" @default.
• W2079449153 modified "2023-10-13" @default.
• W2079449153 title "Nickel ions from a corroded cardiovascular stent induce monocytic cell apoptosis: Proposed impact on vascular remodeling and mechanism" @default.
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• W2079449153 doi "https://doi.org/10.1016/j.jfma.2014.03.007" @default.
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