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Related Concept Videos

Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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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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Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon...
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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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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Study of Cell Migration in Microfabricated Channels
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Leading the Way: Molecular Drivers of Single-Cell Migration.

Dong Li1,2, Hui Tu1,3, Huaqing Cai4,5

  • 1National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

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Summary

Cell migration relies on cytoskeletal dynamics and signaling networks. Studies in Dictyostelium reveal how these elements coordinate for cell movement, even without external cues.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Cell migration is crucial for development and disease.
  • Single-cell models like Dictyostelium discoideum offer insights into migration mechanisms.
  • Migrating cells display polarity with leading-edge protrusions and trailing-edge actomyosin networks.

Purpose of the Study:

  • To review key cytoskeletal and signaling molecules in leading-edge protrusion formation.
  • To emphasize findings from Dictyostelium studies.
  • To discuss the organization of these molecules into excitable networks regulating cell motility.

Main Methods:

  • Review of existing literature on cell migration.
  • Focus on molecular mechanisms in Dictyostelium discoideum.
  • Analysis of signaling networks and cytoskeletal organization.

Main Results:

  • Actin polymerization and cytoskeletal regulators are essential for cell migration.
  • Signaling molecules are integral to cell motility, not just directional sensing.
  • Spontaneous signaling activity coordinates with cytoskeletal reorganization for motility.
  • Key molecules involved in leading-edge protrusion formation were identified.

Conclusions:

  • Cytoskeletal and signaling networks are tightly integrated for cell migration.
  • Excitable signaling networks play a significant role in regulating cell motility.
  • Dictyostelium provides a valuable model for understanding fundamental cell migration principles.