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Related Concept Videos

Cell Migration01:19

Cell Migration

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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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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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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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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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Force transmission during adhesion-independent migration.

Martin Bergert1, Anna Erzberger2, Ravi A Desai3

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Cell migration without focal adhesions uses low forces and substrate friction, unlike high-force integrin-based movement. This adhesion-free cell motility expands the substrate, offering new insights into cellular interactions.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Cell migration is crucial for development and disease.
  • Integrin-based focal adhesions transmit large forces, contracting the substrate during cell movement.
  • The mechanisms of force transmission in focal adhesion-free migration remain unclear.

Purpose of the Study:

  • To investigate the forces and mechanisms driving focal adhesion-free cell migration.
  • To compare force transmission in adhesion-free versus integrin-based migration.

Main Methods:

  • Theoretical modeling combined with experimental approaches.
  • Utilized a non-adherent blebbing cell line as a model system.
  • Analyzed force magnitude, orientation, and transmission during migration.

Main Results:

  • Actin cortex flows drive cell movement via nonspecific substrate friction in adhesion-free migration.
  • Propelling forces are orders of magnitude lower than in focal-adhesion-based motility.
  • Adhesion-free migration exerts outward, expansive forces on the substrate, unlike the contractile forces of focal adhesions.

Conclusions:

  • Focal adhesion-free migration represents a distinct mode of cell motility with unique force transmission properties.
  • This mechanism relies on substrate friction and generates expansive forces.
  • Findings have implications for understanding cell-cell and cell-substrate interactions in vivo.