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Related Concept Videos

Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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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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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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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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S100A4 downregulates filopodia formation through increased dynamic instability.

Connie Goh Then Sin1, Nils Hersch, Philip S Rudland

  • 1School of Life and Health Sciences; Aston University; Birmingham, UK.

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The small calcium binding protein S100A4 promotes cell migration by affecting filopodia stability and focal adhesion maturation. This myosin-dependent mechanism offers new insights into S100A4

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cell migration is crucial for development and disease, involving protrusion formation, adhesion, and focal contact dynamics.
  • The S100A4 protein is implicated in cell motility, but its precise molecular mechanisms remain unclear.

Purpose of the Study:

  • To investigate the direct molecular mechanisms by which S100A4 influences cell migration.
  • To elucidate the role of S100A4 in the regulation of cell protrusions and focal adhesion formation.

Main Methods:

  • Overexpression of S100A4 in a rat mammary tumor cell line.
  • Wound healing scratch assays to assess cell migration.
  • Analysis of filopodia stability and focal adhesion maturation.
  • Use of truncated S100A4 forms to assess myosin IIA dependence.

Main Results:

  • Elevated S100A4 levels enhanced cell migration in wound healing assays.
  • High S100A4 expression led to increased nascent filopodia but impaired their maturation and adhesion.
  • S100A4 overexpressing cells showed reduced stability of focal adhesions.
  • Truncated S100A4 forms unable to bind myosin IIA suggested a myosin-dependent function.

Conclusions:

  • S100A4 regulates cell migration by destabilizing filopodia and hindering focal complex maturation.
  • The observed effects of S100A4 on cell migration are dependent on myosin IIA.
  • This study provides novel insights into the regulatory role of S100A4 in cell motility mechanisms.