Adhesion to the extracellular matrix persists during mitosis in most cell types. However, while classical adhesion complexes, such as focal adhesions, do and must disassemble to enable mitotic rounding, the mechanisms of residual mitotic cell–extracellular matrix adhesion remain undefined. Here, we identify ‘reticular adhesions’, a class of adhesion complex that is mediated by integrin αvβ5, formed during interphase, and preserved at cell–extracellular matrix attachment sites throughout cell division. Consistent with this role, integrin β5 depletion perturbs mitosis and disrupts spatial memory transmission between cell generations. Reticular adhesions are morphologically and dynamically distinct from classical focal adhesions. Mass spectrometry defines their unique composition, enriched in phosphatidylinositol-4,5-bisphosphate (PtdIns(4,5)P2)-binding proteins but lacking virtually all consensus adhesome components. Indeed, reticular adhesions are promoted by PtdIns(4,5)P2, and form independently of talin and F-actin. The distinct characteristics of reticular adhesions provide a solution to the problem of maintaining cell–extracellular matrix attachment during mitotic rounding and division.
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MS data have been deposited at the ProteomeXchange Consortium via the PRIDE partner repository with primary accession codes PXD008645 and PXD008680. Source data for Fig. 4a–d and Supplementary Fig. 4a,b are provided as Supplementary Table 2. All other quantitative data are presented in Supplementary Table 1, while sample images from screening analyses are provided via the GitHub repository described under ‘Code availability’. All additional data supporting the findings of this study are available from the corresponding authors on reasonable request.
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The authors thank D. Critchley (University of Leicester) for providing talin-1-null embryonic stem cells and Z. Li for assistance with the integrin β5/β3-EGFP construct. This work was supported by grants to S.S. from the EU-FP7-Systems Microscopy Network of Excellence (HEALTH-F4-2010-258068), EU-H2020-Multimot (EU grant agreement no. 634107), the Strategic Research Foundation of Sweden (SB16-0046), the Swedish Research Council (521-2012-3180) and the Swedish Cancer Society, and by a grant to M.J.H. from Cancer Research UK (grant no. 13329/A21671). Imaging was in part performed at the live cell imaging facility and Nikon Center of Excellence at the Department of Biosciences and Nutrition, Karolinska Institutet, supported by grants from the Knut and Alice Wallenberg Foundation, the Swedish Research Council, the Centre for Innovative Medicine and the Jonasson donation to the School of Technology and Health, Royal Institute of Technology, Sweden. The authors also acknowledge support from the Bioimaging and Bio-MS core facilities at the University of Manchester. The mass spectrometers and microscopes used in this study were purchased with grants from BBSRC, Wellcome Trust and the University of Manchester Strategic Fund. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript. J.A.A. and X.G. contributed equally to this paper.
The authors declare no competing interests.
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Integrated supplementary information
Supplementary Figure 1 β5-positive, talin- or F-actin-negative structures found in multiple cell lines.
(a) A549 lung cancer cells and A375 melanoma cells plated on glass coverslips for 72 h. Confocal images of immuno-fluorescently labeled integrins αVβ3 (LM609), β1 (9EG7) and αVβ5 (15F11). (b) U2OS cells plated on glass coverslips for 24 and 48 h. Confocal images of immuno-fluorescently labeled integrin β5 and vinculin. (c,d,e) The indicated human-, mouse- and hamster-derived cancer cell lines (c), immortalized diploid cell lines (d) and primary cells (e) were found to contain central β5-positive, talin- and F-actin-negative structures equivalent to those first observed in U2OS cells. Confocal images of cells replated for 3 h on 10 µg/ml vitronectin and immuno-labeled for integrin β5 and either talin or F-actin, as indicated. All images representative of results from at least n = 3 biologically independent experiments. Scale bars: 10 µm
(a-m) Confocal images of U2OS cells plated for 3 h on vitronectin and immuno-labeled against integrin β5 and: the alpha V (αV) subunit of the αVβ5 heterodimer (a); consensus adhesome components [paxilin (b), FAK (c), zyxin (d), kindlin 2 (e)]; integrin β5-binding partners [CSK (genetically encoded GFP-CSK) (f), ICAP1 (g), DOK1 (h)]; phospho-tyrosine (i); and cytoskeletal proteins [F-actin (j), cytokeratin (k), beta (β)-tubulin (l), vimentin (m)]. (n) Confocal image of U2OS cells plated for 3 h on laminin (ECM ligand not bound by αVβ5) and immuno-labeled for integrin β5 and vinculin. (o) Confocal images of an unpermeabilised U2OS cell expressing β5-2GFP, immuno-labeled for β5. All images representative of results from at least n = 3 biologically independent experiments. Scale bars: 10 µm. Boxed areas shown at higher magnification in lower right corners
(a, upper) Confocal images of U2OS cells attached to VN-coated surfaces and labelled for integrin β5, vinculin and F-actin, following 30 min in suspension and 3 h replating in the presence of DMSO, 20 µM CytoD, or 1 µM latrunculin A (LatA). (a, lower) Representative confocal images of U2OS cells attached to vitronectin (VN)-coated surfaces and labeled for integrin β5, vinculin and F-actin, following 3 h replating, with final 1 h in presence of DMSO or 20 µM CytoD. (b) Images comparing attachment of CS1WT or CS1β5 cells to vitronectin in the presence of RAD or RGD peptides and/or CytoD. Zoomed panels demonstrate image-based identification of attached cells using automated cell counting in NIS Elements. Representative of n = 6 biologically independent experiments. (c) Representative immunoblot of talin-2 (68e7 antibody) and tubulin following siRNA treatment with control (CTRL) oligonucleotides or one of three alternative talin-2-targeting oligonucleotides. Unprocessed blots in Supplementary Fig 9. (d) Confocal images of U2OS cells expressing RFP-talin head or RFP-talin rod domains plated on glass coverslips for 48 hours and immunolabeled for integrin β5 and vinculin. Images in A, C-D representative of results from at least n = 3 biologically independent experiments. Scale bars: A, Bvi-viii = 10 µm; Bi-ii and Bix-x = 1000 µm; Biii-v = 100 µm; D = 5 µm
(a,b) Gene-ontology analysis of U2OS steady state adhesion proteins (DMSO treated; focal and reticular adhesions) showing terms from Biological Process (a) and KEGG pathway analysis (b) significantly enriched over whole cell proteome (based on data from n = 3 biologically independent mass spec experiments). P-values were derived from EASE scores calculated using a modified Fishers Exact test with Holm-Bonferroni correction from multiple tests using the DAVID annotation system. (c-g) Confocal images of U2OS β5 V cells attached to vitronectin (VN)-coated surfaces and immuno-labeled against EPS15L1 (c), HIP1R (d), or WASL (e), Intersectin-1 (f), and ARP3 (g). All images representative of results from at least n = 3 biologically independent experiments. Scale bars: C-E = 10 µm; F-G = 5 µm
(a) Representative images illustrating segmentation of U2OS cells based on DAPI (nuclei) and F-actin staining and subsequent segmentation of mCherry-vinculin and integrin β5-2GFP fluorescence (shown for an individual cell; cropped). Images representative of n = 2 biologically independent experiments. Scale bars 50 µm (10 µm in cropped images). (b) Representative images of U2OS cells stained with DAPI (nuclei) and phalloidin, and immunolabelled for integrin β5 and vinculin following treatment with Arp2/3 inhibitor (CK-666) or inactive analogue control (CK-689). Scale bars = 50 µm. (c) Boxplots summarizing single cell quantification (from images as shown in B; n = 1019 cells analysed, averaging 509 + /- 23 (stdev) per condition) of reticular to focal adhesion integrin β5 ratios following treatment with Arp2/3 inhibitor (CK-666) or inactive analogue control (CK-689). Boxplot centre and box edges indicate median and 25th or 75th percentiles, respectively, while whiskers indicate the median + /- 1.5*IQR (inter-quartile range) or the most extreme observations within these limits. Boxplot notches approximate 95% confidence intervals (CI; see methods for details). P-values reflect two-sided unpaired Mann Whitney U testing. Images and data in B-C derived from 3 biologically independent experiments. Source data for C is available in Supplementary Table 1
(a) Single cell quantification (n = 8070 cells analysed, averaging 224 + /- 63 (stdev) per condition) of reticular to focal adhesion integrin β5 ratios for 4 independent siRNAs targeting controls or PIP regulators. Boxplot centre and box edges indicate median and 25th or 75th percentiles, respectively, while whiskers indicate the median + /- 1.5*IQR (inter-quartile range) or the most extreme observations within these limits. Boxplot notches approximate 95% confidence intervals (see methods for details). P-values reflect two-sided unpaired Mann Whitney U testing with Holm-Bonferroni correction from multiple tests. Data derived from 2 biologically independent experiments. Source data is available in Supplementary Table 1 (b) Representative images of U2OS cells stained with DAPI (nuclei) and deep red cell mask membrane dye and showing integrin β5-2GFP and mCherry-vinculin fluorescence following treatment with DMSO, 10 mM Neomycin or 25 μM LY294002. Images in B representative of n = 3 biologically independent experiments. Scale bars = 50 µm
(a-e) Confocal images of mitotic U2OS cells (yellow dashed outlines) plated on VN and labeled for integrin β5 and: integrin β3 subunit (a); and consensus adhesome components [talin (b), vinculin (c), paxillin (d), zyxin (e)]. (f-g) Confocal images of mitotic U2OS cells plated on 10μg/ml laminin (f) or fibronectin (g) immuno-labeled against integrin β5 and integrin β1 subunits. Images in A-K representative of at least n = 3 biologically independent experiments. (h-k) Alternate views of actin-positive retraction filaments (phalloidin-labeled) formed during mitosis and terminating at integrin β5-2GFP-positive adhesion complexes (K cropped from yellow box in J; see Supplementary Movie 9). Images in H-K representative of n = 2 biologically independent experiments. Scale bars:10 µm except in K; 5 µm
(a) Hela cells transfected with control siRNA showing normal cell division (see Supplementary Movie 10). (b) Three example microscopy time series representative of different effects of depleting β5 on cell division: i) cell remains round for an extended time before eventually dividing, often with incomplete cytokinesis (see Supplementary Movie 11). ii) cell repeatedly rounds up and respreads without dividing (see Supplementary Movie 12). iii) cell appears to divide but before cytokinesis merges back into a single bi-nucleate cell (see Supplementary Movie 13. (c) Hela cell treated with β5 siRNA and rescued with β5-EGFP (see Supplementary Movie 14). (a-c) Images were taken at 10 min intervals. Arrows point to mitotic cells of interest. Images representative of n = 3 biologically independent experiments. (d) Representative immunoblot of endogenous and β5-EGFP expression in control and knockdown cells. Unprocessed blot in Supplementary Fig 9. Scale bars = 50 µm
(a) Unprocessed blots from figure SF3C. Film from talin2 blot was accidentally cut at the bottom because the background was too low to see where the membrane ended. (b) Unprocessed blot from figure SF8D
Supplementary Figures 1–9, Supplementary Table and Supplementary Video legends.
Statistics source data.
Proteomic characterisation of reticular adhesions.
Direct and indirect PI45P2 interactors.
Details of antibodies used.
PIP regulator siRNA screen oligonucleotide sequences.
Reticular adhesion formation, maturation and turnover.
Reticular adhesions do not recruit vinculin during their lifetime.
Comparison of reticular and focal adhesion dynamics.
FRAP comparison of integrin-β5 2GFP.
Reticular adhesion formation during cell-ECM attachment in the presence and absence of F-actin.
Reticular adhesions persist throughout cell division when classical focal adhesions disassemble.
Mitotic retraction fibres attach to ECM at reticular adhesion sites.
Post-mitotic daughter cells re-spread through retraction fibres tethered to the ECM by reticular adhesions, thereby recovering the pre-mitotic footprint.
Mitotic retraction fibres contain dense F-actin labelling while reticular adhesion sites have only weak F-actin labelling.
Individual centrally located reticular adhesion complexed persist throughout mitosis.
Cell division in HeLa cells after synchronisation.
Defects in cell division after integrin-β5 knockdown.
Defects in cell division after integrin-β5 knockdown.
Defects in cell division after integrin-β5 knockdown.
Rescue of cell division defects by wild type integrin-β5.
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Lock, J.G., Jones, M.C., Askari, J.A. et al. Reticular adhesions are a distinct class of cell-matrix adhesions that mediate attachment during mitosis. Nat Cell Biol 20, 1290–1302 (2018). https://doi.org/10.1038/s41556-018-0220-2
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