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News & Views |
Cells play tug-of-war to start moving collectively
Orderly or coherent multicellular flows are fundamental in biology, but their triggers are not understood. In epithelial tissues, the tug-of-war between cells is now shown to lead to intrinsic asymmetric distributions in cell polarities that drive such flows.
- Guillermo A. Gomez
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Article |
Spontaneous rotations in epithelia as an interplay between cell polarity and boundaries
Coherent motion of cells plays an important role in morphogenesis. Experiments with cellular rings, supported by numerical simulations, suggest that cell polarity and acto-myosin cables are important factors in the onset of coherence.
- S. Lo Vecchio
- , O. Pertz
- & D. Riveline
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Article |
Size-dependent transition from steady contraction to waves in actomyosin networks with turnover
The behaviour of actomyosin networks with turnover emerges from the interplay between advection and percolation. The contraction pattern is shown to be size-dependent with continuous contraction in small droplets and periodic waves in larger systems.
- Ashwini Krishna
- , Mariya Savinov
- & Kinneret Keren
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Comment |
Cell biology through the macroscopic lens
Macroscale analogies are a powerful conceptual tool with which we can gain insight into the structures and processes of the microscopic world of cell biology.
- Michelle A. Baird
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News & Views |
Mechanical waves help zebrafish regrow their tails
Regenerative animals accurately regrow lost appendages. Now, research suggests that mechanical waves propagating from the amputation edge have a key role in this process.
- Yutaka Matsubayashi
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News & Views |
Synthetic cells on the move
The two-component bacterial MinDE protein system is the simplest biological pattern-forming system ever reported. Now, it establishes a mechanochemical feedback loop fuelling the persistent motion of liposomes.
- Kerstin Göpfrich
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Article |
Mechanical waves identify the amputation position during wound healing in the amputated zebrafish tailfin
It is known that mechanical waves play a role in collective motion in vitro. Now these waves can help an amputated zebrafish know where its fin was cut off to aid regeneration.
- Marco P. De Leon
- , Fu-Lai Wen
- & Chen-Hui Chen
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Article
| Open AccessMechanochemical feedback loop drives persistent motion of liposomes
Through a mechanochemical feedback loop involving Min proteins of Escherichia coli, liposomes start to move, which may help to design motile artificial cells.
- Meifang Fu
- , Tom Burkart
- & Petra Schwille
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News & Views |
Tissues flow and grow
Developing tissues undergo collective cell movement and changes to their material properties, such as flow characteristics. Now tissue fluidity is linked to tissue growth.
- Asako Shindo
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News & Views |
How cells dig a hole for themselves
Epithelial tissues cover our organs and play an important role as physical barriers. The conditions leading to spontaneous hole formation in monolayer epithelia, which challenge epithelial integrity, have now been revealed.
- Tatiana Merle
- & Magali Suzanne
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Article |
Stiffness-dependent active wetting enables optimal collective cell durotaxis
Substrate stiffness influences cellular cluster migration through collective durotaxis. Now, the underlying mechanism of this process is explained by considering the wetting dynamics of the clusters.
- Macià Esteve Pallarès
- , Irina Pi-Jaumà
- & Xavier Trepat
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Article |
Mechanical stress driven by rigidity sensing governs epithelial stability
On soft substrates, epithelial tissues are under high tension and form holes that spontaneously heal. Thus, mechanical stress directly impacts the integrity of epithelia.
- Surabhi Sonam
- , Lakshmi Balasubramaniam
- & Benoît Ladoux
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Letter |
Autonomous waves and global motion modes in living active solids
A continuum active solid system is realized in a bacterial biofilm. Self-sustained elastic waves are observed, and two modes of collective motion with a sharp transition between them are identified.
- Haoran Xu
- , Yulu Huang
- & Yilin Wu
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Article
| Open AccessMorphogen gradient orchestrates pattern-preserving tissue morphogenesis via motility-driven unjamming
Embryo patterning relies on morphogen gradients. Now, a morphogen gradient also encodes an unjamming transition, enabling collective cellular flows that re-shape embryos while preserving patterning.
- Diana Pinheiro
- , Roland Kardos
- & Carl-Philipp Heisenberg
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Article |
Rigid tumours contain soft cancer cells
Cervix and breast carcinomas are highly heterogeneous in their mechanical properties across scales. This heterogeneity provides the tumour with stability and room for cell motility.
- Thomas Fuhs
- , Franziska Wetzel
- & Josef A. Käs
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Article |
Flagella-like beating of actin bundles driven by self-organized myosin waves
Cilia are composed of cytoskeletal filaments and molecular motors and are characterized by a wave-like motion. Here the authors show that this motion is reconstituted in vitro from the self-assembly of polymerizing actin filaments and myosin motors.
- Marie Pochitaloff
- , Martin Miranda
- & Pascal Martin
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Article |
Membrane ruffling is a mechanosensor of extracellular fluid viscosity
Living cells change their behaviour in response to the viscosity of the medium surrounding them. An in vitro study shows that cells spread wider and move faster in a highly viscous medium, provided they have an actively ruffling lamellipodium.
- Matthew Pittman
- , Ernest Iu
- & Yun Chen
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News & Views |
The power of parasite collectives
Plasmodium sporozoites can move in rotating vortices owing to their chiral shape and mechanical flexibility, revealing important physical aspects of collective motion.
- Iva M. Tolić
- & Isabelle Tardieux
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Article |
Collective migration reveals mechanical flexibility of malaria parasites
The collective motion of malaria parasites is analyzed as a model system for active elastic matter and suggests that mechanical flexibility is favourable for parasite transmission.
- Pintu Patra
- , Konrad Beyer
- & Ulrich S. Schwarz
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News & Views |
The beat of isolated cilia
Individual cilia are typically attached to cell surfaces, where they sweep back and forth. A new study charts the behavioural space of the beating patterns of cilia isolated from the cell.
- Kirsty Y. Wan
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Article
| Open AccessCiliary beating patterns map onto a low-dimensional behavioural space
The beating of motile cilia arises from the collective action of hundreds of proteins. A study of the dynamics of cilia under different environmental and genetic conditions shows that the space of beating variations is low-dimensional.
- Veikko F. Geyer
- , Jonathon Howard
- & Pablo Sartori
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Letter |
Surface-tension-induced budding drives alveologenesis in human mammary gland organoids
The development of glands involves cylindrical branches transforming into spherical alveoli. Now there is evidence to suggest that this process can be understood as a budding instability driven by a decrease in tension anisotropy in the tissue.
- Pablo A. Fernández
- , Benedikt Buchmann
- & Andreas R. Bausch
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Letter |
Viscophobic turning dictates microalgae transport in viscosity gradients
Microswimmers tend to accumulate in regions where their speed is significantly reduced, but experimental and numerical evidence now points towards a viscophobic turning mechanism that biases certain microalgae away from high-viscosity areas.
- Michael R. Stehnach
- , Nicolas Waisbord
- & Jeffrey S. Guasto
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News & Views |
Living proof of effective defects
A class of biological matter including elongated cells and filaments can be understood in the framework of active nematic liquid crystals. Within these systems, topological defects emerge and give rise to remarkable collective behaviours.
- M.-A. Fardin
- & B. Ladoux
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Letter |
Topological defects promote layer formation in Myxococcus xanthus colonies
Topological defects in active nematic systems such as epithelial tissues and neural progenitor cells can be associated with biological functions. Here, the authors show that defects can play a role in the layer formation of the soil bacterium Myxococcus xanthus.
- Katherine Copenhagen
- , Ricard Alert
- & Joshua W. Shaevitz
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Letter |
Bacteria solve the problem of crowding by moving slowly
Bacteria are able to move as vast, dense collectives. Here the authors show that slow movement is key to this collective behaviour because faster bacteria cause topological defects to collide together and trap cells in place.
- O. J. Meacock
- , A. Doostmohammadi
- & W. M. Durham
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Letter |
Chemotaxis under flow disorder shapes microbial dispersion in porous media
Bacteria live in heterogeneous environments, so it is important to investigate their behaviour in porous media. Here the authors show that flow disorder enhances the effect of chemical gradients in micropockets in a porous medium, which then aid the transport of bacteria.
- Pietro de Anna
- , Amir A. Pahlavan
- & Ruben Juanes
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Cooperative pattern formation in multi-component bacterial systems through reciprocal motility regulation
The authors engineer Escherichia coli into two distinct strains with tunable motility. The induced control of motility leads to the formation of patterns through a self-organizing mechanism that is specific to multi-component active systems.
- A. I. Curatolo
- , N. Zhou
- & J. Huang
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Article |
Multi-scale spatial heterogeneity enhances particle clearance in airway ciliary arrays
Fluid flow through airways—necessary to keep lungs healthy and free from particles—occurs thanks to moving cilia. Here the authors show that defects in the arrangement of these cilia can facilitate particle clearance through the lungs.
- Guillermina R. Ramirez-San Juan
- , Arnold J. T. M. Mathijssen
- & Manu Prakash
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Mechanochemical symmetry breaking during morphogenesis of lateral-line sensory organs
Symmetry breaking is essential for polarization of cells and generation of left–right body asymmetry. Here the authors investigate the arrangement of hair cells in zebrafish and show that mirror-symmetric patterns arise from a combination of biochemical and mechanical symmetry-breaking events.
- A. Erzberger
- , A. Jacobo
- & A. J. Hudspeth
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Article |
The role of single-cell mechanical behaviour and polarity in driving collective cell migration
Collective cell migration is usually attributed to large-scale transmission of signals through cell junctions. Here, the authors confine cells into a ring-shaped pattern and show that collective cell migration can arise at the single-cell level.
- Shreyansh Jain
- , Victoire M. L. Cachoux
- & Benoit Ladoux
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Letter |
Dynein harnesses active fluctuations of microtubules for faster movement
The motor protein dynein is associated with microtubule force generation in the cell; how it interacts with cytoskeletal fluctuations is still an open question. Here the authors show that dynein can harness these fluctuations to generate power and move faster towards the minus-end of microtubules.
- Yasin Ezber
- , Vladislav Belyy
- & Ahmet Yildiz
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Article |
Cell swelling, softening and invasion in a three-dimensional breast cancer model
A platform for probing the mechanics and migratory dynamics of a growing model breast cancer reveals that cells at the invasive edge are faster, softer and larger than those in the core. Eliminating the softer cells delays the transition to invasion.
- Yu Long Han
- , Adrian F. Pegoraro
- & Ming Guo
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Article |
Substrate area confinement is a key determinant of cell velocity in collective migration
Cells migrating within a collective naturally have restricted access to their surroundings. Experiments on micropatterned substrates now show that this confinement can regulate epithelial migration—governing cell morphology, forces and velocity.
- Danahe Mohammed
- , Guillaume Charras
- & Sylvain Gabriele
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Mechanochemical self-organization determines search pattern in migratory cells
A study of how migrating cells optimize their search efficiency in the absence of directional cues reveals a self-organizing system that mediates superdiffusive motion—and sheds light on how cells navigate noisy environments.
- I. Begemann
- , T. Saha
- & M. Galic
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News & Views |
Stronger than they look
An experimental study of living cells suggests that single myosin molecules are capable of generating unusually large forces. The observation is supported by a theoretical model — and demonstrates the complexity of in vivo force generation.
- Andrew W. Holle
- & Ralf Kemkemer
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Article |
Bacteria display optimal transport near surfaces
Bacteria swimming near surfaces can get trapped in circular trajectories that lead nowhere, hindering efficient surface exploration. A harmful strain of bacteria is now shown to circumvent the problem by exploiting transient surface adhesion events.
- Emiliano Perez Ipiña
- , Stefan Otte
- & Fernando Peruani
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News & Views |
Island hopping for cells
A two-state hopping experiment combined with a dynamical systems model reveals that cancer cells are deterministically driven across barriers, whereas normal cells cross only with the help of stochastic fluctuations.
- Ulrich S. Schwarz
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Article |
Swimming Euglena respond to confinement with a behavioural change enabling effective crawling
Euglenids are unicellular swimmers that undergo striking cell body deformations, interpreted variously as locomotive or functionally redundant. Experiments now suggest that these deformations enable adaptation to a fast crawling mode when the cells are confined.
- Giovanni Noselli
- , Alfred Beran
- & Antonio DeSimone
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Article |
Scaling behaviour in steady-state contracting actomyosin networks
Actomyosin networks with rapid turnover self-organize within droplets, forming a dynamic steady-state with persistent flows. The networks exhibit homogeneous, density-independent contraction, implying that active stress scales with viscosity.
- Maya Malik-Garbi
- , Niv Ierushalmi
- & Kinneret Keren
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Large-scale curvature sensing by directional actin flow drives cellular migration mode switching
Changes in membrane curvature influence how migrating cells navigate their environment. Experiments and modelling reveal that dynamic reorganization of the actin cytoskeleton in response to these changes provides cells with a sensing mechanism.
- Tianchi Chen
- , Andrew Callan-Jones
- & Benoît Ladoux
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News & Views |
Peculiar polygonal paths
Many microorganisms use light-sensitive receptors to migrate. A case in point is the microalga Euglena gracilis, which avoids light intensity increases by swimming in polygonal trajectories — providing an elegant solution to navigational challenges.
- Nicolas Waisbord
- & Jeffrey S. Guasto
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News & Views |
Cellular diversity heals
Cells in embryonic tissues generate coordinated forces to close small wounds rapidly without scarring. New research shows that large cell-to-cell variations in these forces are a key system feature that surprisingly speeds up wound healing.
- M. Shane Hutson
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Perspective |
In pursuit of the mechanics that shape cell surfaces
Robust and responsive, the surface of a cell is as important as its interior when it comes to mechanically regulating form and function. New techniques are shedding light on this role, and a common language to describe its properties is now needed.
- Alba Diz-Muñoz
- , Orion D. Weiner
- & Daniel A. Fletcher
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Dynamic force patterns promote collective cell movements during embryonic wound repair
The motor proteins and contractile forces involved in wound closure are both shown to be heterogeneously distributed around a wound. Theory suggests that this heterogeneity speeds up wound closure, as long as the proteins are mechanically regulated.
- Teresa Zulueta-Coarasa
- & Rodrigo Fernandez-Gonzalez
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News & Views |
Live streaming
Streams of motile cells appear in both healthy development and the evolution of tumours. A study of cells under lateral confinement now suggests their activity plays a key role in triggering these flows.
- Francesc Sagués