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Related Concept Videos

Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

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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.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
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Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

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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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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.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

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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.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
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Polarity of the Cytoskeleton01:18

Polarity of the Cytoskeleton

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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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Updated: Jun 21, 2025

A Graphical User Interface for Software-assisted Tracking of Protein Concentration in Dynamic Cellular Protrusions
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Filopodia: integrating cellular functions with theoretical models.

Victoria Thusgaard Ruhoff1, Natascha Leijnse1, Amin Doostmohammadi1

  • 1Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 København Ø, Denmark.

Trends in Cell Biology
|July 5, 2024
PubMed
Summary

Filopodia are dynamic cell extensions crucial for development and disease. Understanding their molecular and physical properties reveals their roles in processes from embryogenesis to cancer invasion.

Keywords:
cell communicationcell invasioncell motilityfilopodia dynamicsfilopodia rotationmechanosensing

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Area of Science:

  • Cell Biology
  • Biophysics
  • Pathogenesis

Background:

  • Filopodia are dynamic cell surface extensions involved in mechanosensing, guidance, and cell communication.
  • They play critical roles in embryonic development and pathogenic processes like cancer invasion and viral spread.

Purpose of the Study:

  • To highlight recent discoveries on filopodia engagement in development and pathogenesis.
  • To provide an overview of the molecular and physical features of filopodia.

Main Methods:

  • Molecular mapping of the filopodome.
  • Investigation of biophysical mechanisms governing filopodia dynamics.

Main Results:

  • Filopodia possess generic components essential for their functions.
  • Biophysical insights provide a foundation for studying filopodia's biological roles.
  • Filopodia are implicated in diverse developmental and pathological stages.

Conclusions:

  • Filopodia are key cellular structures with complex molecular and physical attributes.
  • Further research into filopodia dynamics and functions is warranted for understanding biological processes and diseases.