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. 2019 Feb 19;10:838. doi: 10.1038/s41467-019-08773-2

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — MST1–FOXO1 cascade establishes cell polarity in EC migration. a Images of phalloidin⁺ actin cytoskeleton and caveolin in indicated ECs subjected to the wound scratch. The dashed lines indicate the initial margin of wound scratch. Scale bars, 200 μm. b Schematic pictures depicting cell morphology at the leading edge in indicated ECs. c Comparisons of indicated parameters in indicated ECs. n = 15, each group in the left panel. n = 10–15, each group at each time in the right panel. d Comparisons of indicated parameters in indicated ECs. n = 1941(siCont), 2190(siMST1), 2217(siFOXO1) in the left panel. n = 24–25, each group in the right panel. e Polar plots showing net displacement. n = 94(siCont), 98(siMST1), 88(siFOXO1). f Schematic picture depicting net displacement and total migrating path and comparison of single cell directional persistence defined by net displacement divided by total migrating path length in indicated ECs. n = 47(siCont), 61(siMST1), 52(siFOXO1). g Images of phalloidin⁺ actin cytoskeleton, α-tubulin⁺ microtubule, GM130⁺ Golgi apparatus and DAPI in the leading edge of indicated ECs at 9 h after initiating cell migration. Note that Golgi apparatus and microtubule (red and yellow arrows) in siCont-ECs are localized in the direction of cell migration, while those (red and yellow arrowheads) in siMST1-ECs and siFOXO1-ECs are localized randomly. Moreover, siMST1-ECs and siFOXO1-ECs rarely show lamellipodia (white arrowheads) compared to siCont-ECs (white arrows). Scale bars, 50 μm. h Polar plots showing Golgi apparatus [n = 36(siCont), 41(siMST1), 38(siFOXO1)] and microtubule organizing centre (MTOC) polarization [n = 45(siCont), 57(siMST1), 41(siFOXO1)]. i Schematic picture summarizing predominant role of MST1 in the nuclear import of FOXO1 against VEGF/VEGFR2-PI3K/AKT pathway at tip ECs. c, d, f Box plots represent Center line, median; Box limits, upper and lower quartiles; whiskers, s.d. Right panel in c represents mean (points) ± s.d. (error bars). Right panel in d represents Bar, mean; Points, median. P values, versus siCont by one-way ANOVA with Tukey’s post hoc test. NS not significant. e, h the bold lines indicate 120° region centered on the vector which is vertical to the wound scratch direction. The numbers indicate the frequency of dots within the 120° region of the bold line. Source data are provided as a Source Data file