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Related Concept Videos

Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

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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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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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Formation of Higher-order Actin Filaments01:11

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The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin...
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Mechanism of Filopodia Formation01:39

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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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The Role of Actin and Myosin in Non-muscle Cells01:10

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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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.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops
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Self-organizing actin patterns shape membrane architecture but not cell mechanics.

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Summary

Actin filament self-organization in living cells forms dynamic patterns like vortices and asters. This process, driven by Arp2/3 complex nucleation, alters cell membrane architecture independently of cortex elasticity.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Cell-free studies show actin-associated proteins organize actin filaments into dynamic patterns (vortices, asters, stars).
  • Understanding actin cortex self-organization in living cells is crucial for cell mechanics and membrane dynamics.

Purpose of the Study:

  • To investigate actin cortex self-organization dynamics in living HeLa cells during adhesion.
  • To determine the driving forces behind actin pattern transitions and their impact on cell mechanics and membrane fluidity.

Main Methods:

  • Utilized complementary microscopic techniques to observe actin cortex organization in living HeLa cells.
  • Performed concomitant measurements of cell mechanics and plasma membrane fluidity.

Main Results:

  • Observed a multistage process of actin pattern transitions (vortices to stars to asters) during cell adhesion.
  • Identified Arp2/3 complex nucleation as the primary driver, contrasting with in vitro predictions involving myosin motors.
  • Demonstrated that actin patterning alters membrane architecture independently of macroscopic cortex elasticity.

Conclusions:

  • Actin cortex self-organization in living cells is a complex process driven by Arp2/3 complex nucleation.
  • Cells can adjust membrane architecture via actin filament assembly without altering macroscopic mechanical properties.
  • This highlights a novel mechanism for cellular adaptation and regulation.