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Related Concept Videos

Cell Motility through Blebbing01:16

Cell Motility through Blebbing

Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
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Actin Polymerization and Cell Motility01:13

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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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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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Imaging Cell Shape Change in Living Drosophila Embryos
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Published on: March 30, 2011

Actin cortex mechanics and cellular morphogenesis.

Guillaume Salbreux1, Guillaume Charras, Ewa Paluch

  • 1Max Planck Institute for the Physics of Complex Systems, Dresden, 01187, Germany. salbreux@pks.mpg.de

Trends in Cell Biology
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PubMed
Summary
This summary is machine-generated.

The actin cortex, a cell structure, controls cell shape through its mechanical properties. Its dysfunction is linked to various diseases, highlighting its importance in cellular processes.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • The actin cortex is a critical cellular structure beneath the plasma membrane.
  • It comprises a crosslinked actin network with myosin motors generating contractile forces.
  • Its attachment to the cell membrane is key for cell shape control.

Purpose of the Study:

  • To review current knowledge on the structural organization, composition, and mechanics of the actin cortex.
  • To link molecular processes to macroscopic physical properties of the cortex.
  • To highlight the consequences of actin cortex dysfunction in disease.

Main Methods:

  • This review synthesizes existing research on the actin cortex.
  • It focuses on structural, compositional, and mechanical aspects.
  • It connects molecular-level functions to observable physical traits.

Main Results:

  • The actin cortex is mechanically rigid yet highly plastic due to rapid protein turnover.
  • It plays essential roles in cell division (cytokinesis), migration, and embryonic development.
  • Dysfunction of the actin cortex is associated with various pathological conditions.

Conclusions:

  • The actin cortex is a dynamic structure crucial for cell shape and function.
  • Understanding its mechanics is vital for comprehending cellular processes and diseases.
  • Further research into the actin cortex promises insights into both fundamental biology and medicine.