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Related Concept Videos

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.
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

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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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Generation of Straight or Branched Actin Filaments01:14

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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
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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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Related Experiment Video

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Microfabricated Platforms for Mechanically Dynamic Cell Culture
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Building an artificial actin cortex on microscopic pillar arrays.

R Ayadi1, W H Roos1

  • 1Natuur- en Sterrenkunde and LaserLab, Vrije Universiteit, De Boelelaan, Amsterdam, The Netherlands.

Methods in Cell Biology
|May 23, 2015
PubMed
Summary

Researchers developed a novel method to create an artificial actin cortex, a key component of cell structure. This biomimetic model allows for studying fundamental actin network interactions, aiding in the design of artificial cells.

Keywords:
Artificial cellBiophysicsBiopolymerCross-linked networkCytoskeletonFluorescence microscopyIn vitro reconstitutionMicrostructured surfacesPDMSSynthetic biology

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biomaterials Science

Background:

  • Eukaryotic cells rely on the cytoskeleton, particularly the cross-linked actin network, for morphology and mechanical strength.
  • The actin cortex, a quasi-2D biopolymer network beneath the cell membrane, is crucial for cellular structure and function.
  • Developing biomimetic models of cellular components is essential for constructing artificial cells using a bottom-up approach.

Purpose of the Study:

  • To describe a novel reconstitution method for creating a freely suspended artificial actin cortex.
  • To enable the study of isolated, reconstituted actin networks for understanding fundamental interaction mechanisms.
  • To provide a foundation for designing functional actin cortices within artificial cell systems.

Main Methods:

  • Fabrication of a regular array of micropillars to serve as a support structure.
  • Reconstitution of a quasi-2D actin network immobilized on the micropillar array at discrete attachment points.
  • Development of a method allowing the actin network to fluctuate freely between attachment points.

Main Results:

  • Successful creation of a freely suspended, reconstituted artificial actin cortex.
  • Demonstration of a method for immobilizing and isolating actin networks on a micropillar array.
  • Establishment of a platform for studying the fundamental mechanics and interactions of actin networks in isolation.

Conclusions:

  • The described reconstitution method allows for the creation of biomimetic actin cortices.
  • This approach facilitates the study of isolated actin network behavior, crucial for understanding cell mechanics.
  • The findings offer valuable insights for the bottom-up construction of artificial cells with functional cytoskeletons.