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. 2021 Feb 26;19:60. doi: 10.1186/s12951-021-00798-4

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© The Author(s) 2021

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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — WK1 cell migration across 3 μm perforations over 48 h with different treatments. a Quantification of cell migration, across 3 μm perforations, following Tf@pSiNPs- or NFA-treatment (data presented as mean ± 1 SD, ** indicates p < 0.01, one-way analysis of variance, n = 3). b Quantification of WK1 cell migration across 8 μm perforations following treatment with Tf@pSiNPs (data presented as mean ± 1 SD, n = 3); no significant difference in migration was observed (Student’s t-test). c Quantification of the intensity of cytoskeletal staining, following treatment with Tf@pSiNPs (data presented as mean ± 1 SD, n = 3) no significant difference was observed (Student’s t-test). d Representative image of the cytoskeletal structure of cells under nanoparticle treatment. Phalloidin (red) and Hoechst 33,342 (blue) staining allowed visualisation of the cytoskeleton and nuclei, respectively. Tf@pSiNPs transferrin-functionalised porous silicon nanoparticles, NFA niflumic acid, SD standard deviation