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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.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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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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Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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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 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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Introduction to Actin01:26

Introduction to Actin

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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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Cell Motility through Blebbing01:16

Cell Motility through Blebbing

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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
In multicellular...
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Related Experiment Video

Updated: Jul 11, 2025

In Vitro Reconstitution of the Actin Cytoskeleton Inside Giant Unilamellar Vesicles
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In Vitro Reconstitution of the Actin Cytoskeleton Inside Giant Unilamellar Vesicles

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Reconstitution of actin-based cellular processes: Why encapsulation changes the rules.

Fabina Binth Kandiyoth1, Alphée Michelot1

  • 1Aix Marseille Univ, CNRS, IBDM, Turing Centre for Living Systems, Marseille, France.

European Journal of Cell Biology
|November 3, 2023
PubMed
Summary

Reconstituting cellular processes in vitro faces challenges in encapsulating biomimetic systems. Key issues include technical hurdles and altered chemical dynamics in small volumes, requiring careful component management for successful cell-free synthesis.

Keywords:
ActinBiomimetismCytoskeletonEncapsulationPolymerizationRecycling

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Last Updated: Jul 11, 2025

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Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • In vitro reconstitution of cellular processes is advancing, but replicating the cellular environment within biomimetic systems remains difficult.
  • Encapsulating concentrated solutions in micrometer-sized compartments presents technical engineering challenges.
  • Reducing experimental volumes alters the chemical dynamics of non-equilibrium systems, complicating reconstitution efforts.

Approach:

  • This review examines the challenges of in vitro reconstitution, using actin polymerization as a model system.
  • We discuss technical difficulties in creating encapsulated biomimetic systems.
  • We highlight the impact of reduced volumes on the chemical evolution of non-equilibrium cellular processes.

Key Points:

  • Successful in vitro reconstitution requires addressing both engineering challenges for encapsulation and the chemical consequences of small experimental volumes.
  • Actin polymerization serves as a relevant example for studying these reconstitution difficulties.
  • Maintaining component availability through controlled consumption and renewal rates is crucial.

Conclusions:

  • Overcoming the challenges in encapsulating biomimetic systems is essential for advancing in vitro reconstitution of cellular processes.
  • Careful consideration of component amounts, consumption, and renewal rates is vital for successful non-equilibrium system reconstitution.
  • Further research into engineering strategies and understanding volume-dependent chemical dynamics will improve cell-free synthesis approaches.