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Related Concept Videos

Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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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.
Some...
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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
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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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.
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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.
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Cytoskeletal Coordination in Cell Migration01:32

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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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.
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Related Experiment Video

Updated: Mar 13, 2026

Labeling F-actin Barbed Ends with Rhodamine-actin in Permeabilized Neuronal Growth Cones
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Signalling Pathways Controlling Cellular Actin Organization.

Anika Steffen1, Theresia E B Stradal2, Klemens Rottner1,3

  • 1Department of Cell Biology, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, 38124, Braunschweig, Germany.

Handbook of Experimental Pharmacology
|October 21, 2016
PubMed
Summary
This summary is machine-generated.

The actin cytoskeleton, crucial for cell shape, reorganizes via filament dynamics. Rho-family GTPases are key regulators, influencing both plasma membrane and intracellular actin dynamics, impacting cell functions like autophagy.

Keywords:
Actin turnoverAutophagyLeading edgeMigrationProtrusionRho-GTPaseTrafficking

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A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
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Related Experiment Videos

Last Updated: Mar 13, 2026

Labeling F-actin Barbed Ends with Rhodamine-actin in Permeabilized Neuronal Growth Cones
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A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
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Area of Science:

  • Cell Biology
  • Biochemistry

Background:

  • The actin cytoskeleton is fundamental for cell morphogenesis and shape changes.
  • Actin filament reorganization is a dynamic process involving continuous disassembly and re-assembly.
  • Cellular machinery regulates actin dynamics in response to environmental cues and specific needs.

Purpose of the Study:

  • To outline key signaling pathways involved in actin structure reorganization at the plasma membrane.
  • To highlight the central role of Rho-family GTPases in actin reorganization.
  • To explore the emerging role of actin reorganization on intracellular membranes and its connection to autophagy.

Main Methods:

  • Review of fundamental signaling pathways.
  • Analysis of Rho-family GTPase functions in actin dynamics.
  • Investigation of actin reorganization at intracellular membranes.

Main Results:

  • Rho-family GTPases are central to actin reorganization pathways at the plasma membrane.
  • Understanding Rho-GTPase contributions refines knowledge of these signaling nodes.
  • Actin reorganization on intracellular membranes is functionally linked to Rho-GTPase signaling and autophagy.

Conclusions:

  • Rho-GTPase signaling is critical for regulating actin cytoskeleton dynamics.
  • Further research into Rho-GTPases will enhance understanding of cell shape and function.
  • Actin dynamics on intracellular membranes are relevant to cellular processes like autophagy.