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Related Concept Videos

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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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.
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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Cancer Cell Migration through Invadopodia01:35

Cancer Cell Migration through Invadopodia

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Invadosome is a broad category of cell surface structures with proteolytic activity that  degrades the extracellular matrix (ECM). Invadosomes are present in normal cell types, including macrophages, endothelial cells, and neurons, as well as tumor cells. Although the macrophage podosomes and tumor cell invadopodia are classified as invadosomes, they have different structures, molecular pathways, and functions. Podosomes are short structures that last for a few minutes. However,...
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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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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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Modeling and Imaging 3-Dimensional Collective Cell Invasion
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Nucleating actin for invasion.

Alexander Nürnberg1, Thomas Kitzing, Robert Grosse

  • 1Institute of Pharmacology, University of Marburg, Karl-von-Frisch-Str. 1, 35032 Marburg, Germany.

Nature Reviews. Cancer
|February 18, 2011
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Summary
This summary is machine-generated.

Cancer cell invasion, a key step in metastasis, relies on actin assembly regulated by nucleation factors. Understanding these factors could lead to new treatments for invasive and metastatic cancers.

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Area of Science:

  • Cell biology
  • Cancer research
  • Biochemistry

Background:

  • Metastasis, the spread of cancer cells, is the primary cause of cancer-related mortality.
  • Invasive cell migration is essential for metastasis and involves actin-driven structures like invadopodia and pseudopodia.

Purpose of the Study:

  • To explore the role of actin nucleation factors in cancer cell invasion and migration.
  • To identify potential therapeutic targets within the actin cytoskeleton regulation pathways.

Main Methods:

  • Investigating the mechanisms of various actin nucleation factors.
  • Analyzing the involvement of these factors in cancer cell functions.

Main Results:

  • Actin assembly, regulated by specialized nucleation factors, is crucial for invasive cell structures.
  • Several classes of actin nucleators, including formins and Arp2/3-regulating proteins, are involved.

Conclusions:

  • Targeting actin nucleation factors presents a promising strategy for developing novel treatments against cancer invasion and metastasis.