It has long been proposed that the cell cycle is regulated by physical forces at the cell–cell and cell–extracellular matrix (ECM) interfaces1,2,3,4,5,6,7,8,9,10,11,12. However, the evolution of these forces during the cycle has never been measured in a tissue, and whether this evolution affects cell cycle progression is unknown. Here, we quantified cell–cell tension and cell–ECM traction throughout the complete cycle of a large cell population in a growing epithelium. These measurements unveil temporal mechanical patterns that span the entire cell cycle and regulate its duration, the G1–S transition and mitotic rounding. Cells subjected to higher intercellular tension exhibit a higher probability to transition from G1 to S, as well as shorter G1 and S–G2–M phases. Moreover, we show that tension and mechanical energy are better predictors of the duration of G1 than measured geometric properties. Tension increases during the cell cycle but decreases 3 hours before mitosis. Using optogenetic control of contractility, we show that this tension drop favours mitotic rounding. Our results establish that cell cycle progression is regulated cooperatively by forces between the dividing cell and its neighbours.
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We thank N. Castro for technical assistance, A. Elosegui-Artola for assistance with the data analysis and L. Hufnagel for generously providing MDCK-Fucci cells. We are grateful to B. Baum and members of our groups for insightful comments and discussion. This work was supported by the Spanish Ministry of Economy and Competitiveness/FEDER (BES-2013-062633 grant to M.U., BFU2016-79916-P and BFU2014-52586-REDT to P.R.-C., BFU2015-65074-P to X.T., and BFU2016-75101-P and RYC-2014-15559 to V.C.), the Generalitat de Catalunya (2014-SGR-927 to X.T. and CERCA programme), the European Research Council (CoG-616480 to X.T.), European Commission (Grant Agreement SEP-210342844 to P.R.-C. and X.T.), Obra Social “La Caixa”, a Career Integration Grant within the seventh European Community Framework Programme (PCIG10-GA-2011-303848 to P.R.-C.), Fundació la Marató de TV3 (project 20133330 to P.R.-C.). IBEC is recipient of a Severo Ochoa Award of Excellence from the MINECO.
The authors declare no competing interests.
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Integrated Supplementary Information
(a) Maximum intensity projection image of Fucci cells expressing CIBN-CAAX-GFP as a membrane marker 12 h after removing the PDMS membrane. (b) Map of monolayer height corresponding to (a). Images are representative of n = 4 independent experiments. c-e, Monolayer height (c), monolayer area (d), and monolayer volume (e), at different times after removing the PDMS membrane (n = 4 experiments). (f) Monolayer height profile at different times after removing the PDMS membrane. Data is representative of n = 4 independent experiments. (g) Cell height as a function of cell area for cells at G1 during an arbitrary time point of monolayer expansion (19 h, n = 185 cells from 3 independent experiments). (h) Area of cells in G1 binned in area quintiles (5 groups of 37 cells each). (i) Cell height as a function of tension for each of the n = 185 cells. Each of the groups shown in (h) is labelled using a different color/symbol. Height and tension are weakly correlated for the whole cell population (black dashed line) but correlation is lost within each group (r1 = −0.04, r2 = −0.11, r3 = −0.21, r4 = 0.19, r5 = −0.13, rall = −0.17, Pearson Correlation). Thus, for cells with the same area, tension and height are not correlated. Note, however, that a precise reconstruction of tension using Monolayer Stress Microscopy would require knowledge of the geometry of the stress bearing elements of the cell in 3D. All error bars represent SD.
(a-c) Traction and tension followed a very similar temporal pattern in expansion (Fig. 1) and confinement (no expansion), characterized by a transient increase followed by a slow decrease and a plateau. As expected, however, cell density followed opposite trends in the two conditions. (a) Time evolution of mean traction in monolayers confined to rectangular patterns. (b) Time evolution of mean tension in monolayers confined to rectangular patterns. (c) Time evolution of cell area in monolayers confined to rectangular patterns. Cells were seeded in rectangular collagen patterns of the same size than those used for expansion studies (Fig. 1). Data recording started 4 h after seeding (as in the expansion case). Data are averages from n = 9 patterns from 2 independent experiments. Shaded areas are SD.
Supplementary Figure 3 Extended correlation matrix between measured properties and cell cycle duration.
a-b, Pearson's linear correlation coefficients between all physical properties and the duration of G1 (a), and S-G2-M (b). (c) Duration of G1, duration of the interval between the beginning of the cycle and the Cdt1 peak, and duration of the interval between the Cdt1 peak and the G1-S transition. Mean±SD are represented. (d) Pearson's linear correlation coefficients between the duration of G1 and the population averaged cell properties over the 0h-Cdt1peak interval. (e) The duration of S-G2-M correlates with that of G1, indicating that S-G2-M has memory of G1. Dashed lines represent linear fits. All graphs include n = 120 cells from 3 independent experiments. Error bars represent SD.
(a) Cell area at the G1-S transition as a function of cell area at birth. (b) Cell area increment during G1 as a function of cell area at birth. The observed positive correlation between the area added during G1 and the initial cell area rules out an adder behavior in area. (c) Mean cell area growth rate during G1 as a function of mean cell tension during G1. (d) Pearson's linear correlation coefficients between the duration of G1, tG1, and cellular tension 6 h after the beginning of the cycle, σc6h. Correlations are computed for each area growth rate sextile 6 h after the beginning of the cycle. For each sextile correlation is negative, supporting that tension is predictive of G1 duration independently of area growth rate. (e) Area at the G1-S transition as a function of the mean cell area growth rate during G1. (f) Area at the G1-S transition as a function of the mean nuclear area growth rate during G1. (g) Mean cell area during G1 as a function of the mean nuclear area during G1. Dashed lines represent linear fits. All graphs include n = 120 cells from 3 independent experiments.
(a) Bayes factors of the product models that predict G1 duration. (b) Bayes factors of the product models used to predict S-G2-M duration. All Bayes factors were computed using n = 120 cells from 3 independent experiments.
Supplementary Figures 1–5, Supplementary Table and Supplementary Video legends
Ranked list of one-property linear models to predict the duration of G1, tG1 (top), or the duration of S–G2–M, tSG2M (bottom).
Ranked list of two-property product models to predict the duration of G1, tG1.
Ranked list of two-property product models to predict the duration of S-G2-M, tSG2M.
Ranked list of two-term product models to predict the duration of G1, tG1.
Ranked list of two-term product models to predict the duration of S-G2-M, tSG2M.
Force maps during MDCK-Fucci growth.
MDCK monolayers expand at constant density.
Illustration of force average calculation.
Cytoskeletal dynamics in the dividing cell and its neighbours.
E-cadherin dynamics in the dividing cell and its neighbours.
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Uroz, M., Wistorf, S., Serra-Picamal, X. et al. Regulation of cell cycle progression by cell–cell and cell–matrix forces. Nat Cell Biol 20, 646–654 (2018). https://doi.org/10.1038/s41556-018-0107-2
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