Mechanical stress driven by rigidity sensing governs epithelial stability
Posted on: 23 May 2022 , updated on: 30 May 2022
Preprint posted on 12 March 2022
Article now published in Nature Physics at http://dx.doi.org/10.1038/s41567-022-01826-2
Wonder how rigidity sensing contributes to mechanical failure in epithelial tissues? Go check this preprint.
Selected by yohalie kalukula
Categories: bioengineering, biophysics, cell biology, developmental biology
Background of the preprint
Epithelia act as permeable protective barriers lining organs and covering most surfaces of the human body1. The mechanical feedback between a tissue and its environment, coordinating tissue scale stresses (local compression, tensile stress) and external mechanical stresses (stiffness) contribute to epithelial integrity, and it is becoming increasingly clear that substrate stiffness plays an important role in regulating collective migration and permeability of epithelial cells1,2. However, the mechanism underlying rigidity sensing by epithelia in different environments and how this process contributes to mechanical failure and impaired permeability remains unclear.
In this preprint, Sonam et al. identified the need for fundamental understanding of these processes. They used micropatterned epithelial tissues to investigate the influence of substrate rigidity on hole formation through active nematic modelling.
Key findings of the preprint
To investigate the role of the matrix stiffness on the maintenance of epithelia integrity, the authors cultured renal and colorectal adenocarcinoma epithelial cells on polyacrylamide (PAAm) hydrogels of distinct stiffnesses ranging from 2.3 (soft) to 55 (stiff) kPa. PAAm hydrogels were functionalized with fibronectin circular patterns to standardize the size and density of microtissues of epithelial cells (fig. 1a).
The authors first observed the formation of holes in epithelial monolayers that impair the monolayer integrity and demonstrated that the number of holes is regulated by the matrix rigidity (fig. 1b). The frequency of holes monotonically decreased with the gel stiffening. Considering that stiffness mechanosensing relies on the crosstalk between cell-cell and cell-substrate adhesions, the authors studied both cellular interfaces to explain their observations.
Spontaneous hole formation is reminiscent of an active dewetting process* due to low interactions at the cell-substrate interface. Indeed, previous observations showed that cells exert larger contractile stress on stiff substrates compared to soft substrates3. By modulating the fibronectin density to interrogate the role of substrate adhesion on hole formation, the authors confirmed that stiffness sensing is the major contributory factor for mechanical failure.
*Dewetting unlike spreading, this process occurs when a liquid film retracts from a solid surface to form a bead-shaped drop. The liquid tends to minimize its surface tension by minimizing interactions with the surface.
To gain further insights on the mechanism of hole formation, the authors focused their attention on cell-cell interfaces, where friction originating from cell-cell adhesive interactions resists cell motion. However, how these forces are influenced by substrate stiffness is unclear. Interestingly, the authors observed a redistribution of vinculin from focal adhesions on stiff substrates to cellular junctions on soft substrates. When focal adhesions fail to form due to a lack of built-up basal tension, vinculin shuttles to cell-cell junctions, leading to a build-up of junctional tension.
Sonam et al. used a cell-based vertex model to simulate the balance of forces in the epithelial sheet. The vertex model considers the cell sheet as a polygonal network in which cells are connected individual polygons. In this framework, the dynamic organization of the cell sheet, in terms of changes in cell shape and position over time, is dictated by the motion of the vertices. Each vertex moves in response to mechanical forces originating from growth, interfacial tension, and pressure within each cell. Using a simple viscoelastic model, the authors describe how these forces are balanced to dictate vertices dynamic. They state that the total stress load is shared between a cell-cell elastic modulus (spring) and the viscous drag on the substrate (damper). Interestingly, the viscous drag translates into a frictional force at the cell-substrate interface which is known to increase with substrate stiffness4. Keeping that in mind, lower substrate stiffness leads to stress loads balanced between a weaker damper and cell-cell spring. When the substrate fails to provide sufficient mechanical feedback, this causes mechanical failure at cell-cell junctions
Further supporting their model, they also revealed that stiffness sensing contributes to hole formation via a switch from a tensile state on soft substrates to compressive state on stiff substrates. This supports the wetting transition observed when switching from a soft to a stiff substrate.
Figure 1- a. Schematic of the process of fibronectin patterning on PA gels; top: fibronectin coating on coverslips patterned through deep UV; middle: PA gel is placed between patterned and silanized coverslips; bottom: MDCK cells are seeded on patterned PA gel. b. Time based montage of MDCK cells forming holes on 2.3kPa PA gels (top panel) and intact monolayers on 55kPa gels (bottom panel). Scale bare: 100 µm. c. Orientation field overlaid over phase contrast images obtained from experiments on soft (2.3kPa) substrates representing -1/2 defect (left column) and +1/2 defect (right column). Sb: 50μm. e. Schematic representing the process of hole opening. Adapted from Sonam et al.
Finally, an originality of their approach is to consider the contribution of spatial organization and orientational alignment in the order within a cell sheet. To this aim, the authors used an elegant active nematic model – making the analogy with particle organization in liquid crystal – to understand the origin of the increase in local stress prior to hole formation. They identified the presence of active topological defects (fig. 1c) on both soft and stiff substrates, suggesting a strong correlation between the persistence of tensile regions and the lifetime of defects on soft substrates. Upon correlating the location of hole formation with the defect location, they found that holes form at specific locations around topological defects on soft substrates (fig 1 c and d).
Why I like this preprint
Epithelia are very cohesive collective systems and understanding the mechanisms that lead to their mechanical failure is crucial. To address this exciting open question, Sonam et al. combined an original experimental approach with a cell-based vertex model5,6 to show that topological defects could sustain the large amounts of stresses required to trigger hole opening when cell-substrate interactions are weak. Their elegant approach exploits a timely hot topic, the modelling of epithelia monolayer as nematic liquid crystal, and brings important insights into the understanding of the mechanical integrity of epithelial monolayers.
Future directions
For future experiments, it would be interesting to test the influence of other fundamental physico-chemical properties of the matrix. For instance, the density of ligands, the matrix porosity, or the loss modulus (viscous part) are important parameters influencing tissus that could be taken into account.
Questions for the authors
- Is there any other physico-chemical properties of the synthetic matrix that should be taken into account instead of the rigidity such as the density of fibronectin, the porosity, or the loss modulus (viscous part) ? Did you confirm your observations by performing similar experiments on natural matrices (i.e. collagen) of similar rigidities?
- Topological defects are related to nematic organization, as observed in liquid crystals. You used MDCK and colorectal adenocarcinoma epithelial cells that display such features. Could you generalize your findings to any other epithelial cell types ? Do you already observe such topological defects in vivo?
- Ladoux, B. & Mège, R.-M. Mechanobiology of collective cell behaviours. Nat Rev Mol Cell Bio 18, 743–757 (2017).
- Jones, J. Substrate stiffness regulates extracellular matrix deposition by alveolar epithelial cells. Res Reports Biology 1 (2011). doi:10.2147/rrb.s13178
- Alert, R. & Casademunt, J. Role of Substrate Stiffness in Tissue Spreading: Wetting Transition and Tissue Durotaxis. Langmuir 35, 7571–7577 (2019).
- Vazquez, K., Saraswathibhatla, A. & Notbohm, J. Effect of substrate stiffness on friction in collective cell migration. Sci Rep-uk 12, 2474 (2022).
- Fletcher, A. G., Osterfield, M., Baker, R. E. & Shvartsman, S. Y. Vertex Models of Epithelial Morphogenesis. Biophys J 106, 2291–2304 (2014).
- Luciano, M., Xue, S.-L., Vos, W. H. D., Redondo-Morata, L., Surin, M., Lafont, F., Hannezo, E. & Gabriele, S. Cell monolayers sense curvature by exploiting active mechanics and nuclear mechanoadaptation. Nat Phys 17, 1382–1390 (2021).
doi: https://doi.org/10.1242/prelights.32101
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EMBL Synthetic Morphogenesis: From Gene Circuits to Tissue Architecture (2021)
A list of preprints mentioned at the #EESmorphoG virtual meeting in 2021.
| List by | Alex Eve |
EMBL Conference: From functional genomics to systems biology
Preprints presented at the virtual EMBL conference "from functional genomics and systems biology", 16-19 November 2020
| List by | Jesus Victorino |
Single Cell Biology 2020
A list of preprints mentioned at the Wellcome Genome Campus Single Cell Biology 2020 meeting.
| List by | Alex Eve |
Society for Developmental Biology 79th Annual Meeting
Preprints at SDB 2020
| List by | Irepan Salvador-Martinez, Martin Estermann |
FENS 2020
A collection of preprints presented during the virtual meeting of the Federation of European Neuroscience Societies (FENS) in 2020
| List by | Ana Dorrego-Rivas |
Planar Cell Polarity – PCP
This preList contains preprints about the latest findings on Planar Cell Polarity (PCP) in various model organisms at the molecular, cellular and tissue levels.
| List by | Ana Dorrego-Rivas |
Cell Polarity
Recent research from the field of cell polarity is summarized in this list of preprints. It comprises of studies focusing on various forms of cell polarity ranging from epithelial polarity, planar cell polarity to front-to-rear polarity.
| List by | Yamini Ravichandran |
TAGC 2020
Preprints recently presented at the virtual Allied Genetics Conference, April 22-26, 2020. #TAGC20
| List by | Maiko Kitaoka et al. |
3D Gastruloids
A curated list of preprints related to Gastruloids (in vitro models of early development obtained by 3D aggregation of embryonic cells). Updated until July 2021.
| List by | Paul Gerald L. Sanchez and Stefano Vianello |
ASCB EMBO Annual Meeting 2019
A collection of preprints presented at the 2019 ASCB EMBO Meeting in Washington, DC (December 7-11)
| List by | Madhuja Samaddar et al. |
EDBC Alicante 2019
Preprints presented at the European Developmental Biology Congress (EDBC) in Alicante, October 23-26 2019.
| List by | Sergio Menchero et al. |
EMBL Seeing is Believing – Imaging the Molecular Processes of Life
Preprints discussed at the 2019 edition of Seeing is Believing, at EMBL Heidelberg from the 9th-12th October 2019
| List by | Dey Lab |
SDB 78th Annual Meeting 2019
A curation of the preprints presented at the SDB meeting in Boston, July 26-30 2019. The preList will be updated throughout the duration of the meeting.
| List by | Alex Eve |
Lung Disease and Regeneration
This preprint list compiles highlights from the field of lung biology.
| List by | Rob Hynds |
Young Embryologist Network Conference 2019
Preprints presented at the Young Embryologist Network 2019 conference, 13 May, The Francis Crick Institute, London
| List by | Alex Eve |
Pattern formation during development
The aim of this preList is to integrate results about the mechanisms that govern patterning during development, from genes implicated in the processes to theoritical models of pattern formation in nature.
| List by | Alexa Sadier |
BSCB/BSDB Annual Meeting 2019
Preprints presented at the BSCB/BSDB Annual Meeting 2019
| List by | Dey Lab |
Zebrafish immunology
A compilation of cutting-edge research that uses the zebrafish as a model system to elucidate novel immunological mechanisms in health and disease.
| List by | Shikha Nayar |