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• W2087880080 abstract "Traditionally, in vitro material biocompatibility studies involved evaluating cell response when cultured in the presence of a sample of the material. In this study, we present a different approach to evaluate the biocompatibility of a metallic biomaterial. Our study is based on estimating what local concentrations of metallic ions are present at the site of implantation of an endovascular stent based on other studies in the literature. We then quantify the concentrations of metallic ions present in our conditioned media in which Nitinol wires were allowed to corrode, and compare cell response to ion concentrations in order to provide better experimental reproducibility. This is important to eliminate the variability of ion release rates from metals (even from the same lot) under similar conditions. Cell culture experiments using vascular smooth muscle cells exposed to clinically significant concentrations of nickel ions released from Nitinol showed two important responses. A decrease in cell aspect ratios showing a morphological change possibly indicating a shift towards a more synthetic phenotype was observed. Secondly, a decrease in α-actin expression was characterized by immunostaining with a fluorescent tag. At the highest concentration tested, average fluorescence decreased by approximately 26%, indicating a loss of the cellular contractile mechanism. However, the ion concentrations utilized in this study did not significantly affect cellular proliferation." @default.
• W2087880080 created "2016-06-24" @default.
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• W2087880080 date "2011-01-01" @default.
• W2087880080 modified "2023-10-04" @default.
• W2087880080 title "Nickel ions inhibit α-actin expression and decrease aspect ratio of rat vascular smooth muscle cells in vitro" @default.
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• W2087880080 doi "https://doi.org/10.1039/c1mt00035g" @default.
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