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Related Concept Videos

Tension Response at Adherens Junctions01:26

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Actin Polymerization and Cell Motility01:13

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Generation of Straight or Branched Actin Filaments01:14

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Mechanism of Lamellipodia Formation01:31

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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Cell-matrix's Response to Mechanical Forces

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Related Experiment Video

Updated: May 5, 2026

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Mechanotransduction down to individual actin filaments.

Guillaume Romet-Lemonne1, Antoine Jégou

  • 1Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, 91190 Gif-sur-Yvette, France.

European Journal of Cell Biology
|November 21, 2013
PubMed
Summary

Mechanical stress on actin filaments influences their assembly dynamics. Individual actin filaments act as mechanosensors, altering protein interactions and regulating cellular mechanics.

Keywords:
ADFADPAFMATPActin dynamicsCell mechanicsCryo-EMF-actinForcesForminG-actinMechanosensitivityMicrofluidicsOptical trapsRegulatory proteinsSingle filamentTIRFTensionactin depolymerizing factoradenosine diphosphateadenosine triphosphateatomic force microscopycryoelectron microscopyfilamentous actinglobular (monomeric) actinmDia1mammalian diaphanous 1total internal reflection fluorescence

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • The actin cytoskeleton is crucial for cellular force generation and sensing.
  • Mechanotransduction, the conversion of mechanical cues to biochemical signals, is a complex multi-scale cellular process.
  • Understanding how mechanical stress impacts actin filament assembly is vital for comprehending cellular responses.

Purpose of the Study:

  • To review and synthesize current understanding of how mechanical stress affects actin filament assembly dynamics.
  • To highlight emerging experimental insights into mechanotransduction at the individual actin filament level.

Main Methods:

  • Review of recent experimental studies focusing on individual actin filaments.
  • Analysis of data demonstrating the role of mechanical stress in altering filament conformation and protein interactions.

Main Results:

  • Actin filaments function as mechanosensors, with applied tension or curvature modifying their conformation and protein binding.
  • Filaments transmit mechanical tension, inducing conformational changes in associated proteins that regulate assembly.
  • Mechanotransduction occurs at the scale of individual filaments, demonstrating force-mediated regulation of assembly and organization.

Conclusions:

  • Forces directly participate in the regulation of actin filament assembly and cellular organization.
  • Individual actin filaments are key players in the elementary events coupling mechanics and biochemistry within cells.
  • Recent technical advancements are paving the way for deeper insights into cytoskeletal mechanobiology.