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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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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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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.
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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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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.
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Related Experiment Video

Updated: Mar 14, 2026

Labeling F-actin Barbed Ends with Rhodamine-actin in Permeabilized Neuronal Growth Cones
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Triggering signaling pathways using F-actin self-organization.

A Colin1, L Bonnemay1, C Gayrard1

  • 1Ecole Normale SupĂ©rieure, Department of Chemistry PSL Research University-CNRS-ENS-UPMC 24, rue Lhomond, 75005, Paris, France.

Scientific Reports
|October 5, 2016
PubMed
Summary
This summary is machine-generated.

Cellular cytoskeleton organization, specifically F-actin, can control signaling pathways. Engineered F-actin self-organization confined and scaffolded signaling proteins, triggering cellular switches and microtubule assembly.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • The spatiotemporal organization of cellular proteins is crucial for cell fate.
  • The cytoskeleton's role in shaping and controlling cytoplasmic signaling pathways remains incompletely understood.
  • Understanding this interplay is key to deciphering cellular functions.

Purpose of the Study:

  • To investigate how F-actin self-organization can trigger and control cellular signaling pathways.
  • To engineer novel properties of microfilament self-organization for controlling signaling.
  • To establish in vitro models for studying cytoskeleton-signaling interactions.

Main Methods:

  • Engineering F-actin self-organization to include protein confinement and scaffolding.
  • Utilizing in vitro reconstitutions of cellular functions.
  • Employing nanoparticle-based signaling platforms and engineered signaling proteins.
  • Investigating Ran-dependent microtubule nucleation.

Main Results:

  • Engineered F-actin self-organization, through confinement and scaffolding, can trigger signaling switches.
  • F-actin contractility powered nanoparticle-based signaling platforms.
  • Scaffolding signaling proteins along actin microfilaments initiated signaling.
  • F-actin dynamics were shown to promote robust microtubule assembly.

Conclusions:

  • F-actin self-organization is a viable mechanism for controlling signaling pathways in space and time.
  • In vitro reconstitution provides a powerful approach to study cytoskeleton-signaling dynamics.
  • This work lays the foundation for bottom-up strategies to understand cellular organization and function.