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Related Concept Videos

Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
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Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon...
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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 polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions
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Migrating immune cells globally coordinate protrusive forces.

Patricia Reis-Rodrigues1, Mario J Avellaneda1, Nikola Canigova1

  • 1Institute of Science and Technology Austria (ISTA), Klosterneuburg, Austria.

Nature Immunology
|July 15, 2025
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Summary
This summary is machine-generated.

Leukocytes navigate dense tissues by forming a central actin pool to dilate paths, pushing their nucleus and organelles forward. This actin regulation is crucial for cell movement and maintaining integrity in complex environments.

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Area of Science:

  • Cell biology
  • Immunology
  • Biophysics

Background:

  • Leukocyte migration is essential for immune responses.
  • Cells typically use an ameboid motion, probing with their nucleus.
  • Dense tissues present challenges to leukocyte traversal.

Purpose of the Study:

  • Investigate leukocyte migration mechanisms in dense environments.
  • Elucidate the role of the nucleus, centrosome, and actin in confined spaces.
  • Understand how actin dynamics regulate cell shape and movement.

Main Methods:

  • Live-cell imaging of leukocytes in engineered dense matrices.
  • Perturbation of F-actin dynamics using chemical inhibitors.
  • Quantitative analysis of cell morphology, organelle positioning, and nucleus movement.

Main Results:

  • In dense environments, leukocytes reposition their nucleus behind the centrosome and organelles.
  • Cellular compression triggers the assembly of a central F-actin pool.
  • This central actin pool dilates paths, facilitating organelle and nucleus passage.
  • A tight coupling exists between central and leading-edge actin pools.
  • Depleting central actin enhances leading-edge activity but impairs migration in restrictive environments.

Conclusions:

  • Leukocytes employ a novel actin-based mechanism for navigating dense tissues.
  • A central actin pool balances path dilation with leading-edge advancement.
  • This mechanism maintains cellular coherence during migration in challenging environments.