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. 2020 Jan 29;45(4):809–824. doi: 10.1007/s11064-020-02954-y

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Comparison of copper accumulation and cell viability after application of iron-free CuO-NPs or CuO-Fe-NPs to C6 glioma cells. The cells were incubated with the indicated concentrations of CuO-NPs or CuO-Fe-NPs in IB-BSA for 30 min at 37 °C before the cellular LDH activity (a), the cellular copper content (b) and the cellular iron content (c) were determined. The data shown represent means ± SD of values obtained in three independent experiments. Hashes indicate the significance of differences of data obtained from cells that had been treated with CuO-NPs and CuO-Fe-NPs (^#p < 0.05, ^##p < 0.01, ^###p < 0.001; paired t test). d Correlation of the individual values of cellular LDH activity from three independent experiments with the respective specific cellular copper contents determined for cells that had been treated with either CuO-NPs or CuO-Fe-NPs