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Related Concept Videos

Cell Migration01:09

Cell Migration

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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cell Migration01:19

Cell Migration

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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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Types of Membrane Protrusions01:28

Types of Membrane Protrusions

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The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most  widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
The microvilli, an example of stable protrusions, are finger-like projections...
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Role of Myosin in Cell Migration01:18

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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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Cell Motility through Blebbing01:16

Cell Motility through Blebbing

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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
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Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Related Experiment Video

Updated: Apr 27, 2026

Measuring Cell-Edge Protrusion Dynamics during Spreading using Live-Cell Microscopy
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Measuring Cell-Edge Protrusion Dynamics during Spreading using Live-Cell Microscopy

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Protrusion fluctuations direct cell motion.

David Caballero1, Raphaël Voituriez2, Daniel Riveline1

  • 1Laboratory of Cell Physics, Institut de Science et d'Ingénierie Supramoléculaires/Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg and Centre National de la Recherche Scientifique UMR 7006, Strasbourg, France; Development and Stem Cells Program, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique UMR 7104, Institut National de la Santé et de la Recherche Médicale (U964),Université de Strasbourg, Illkirch, France.

Biophysical Journal
|July 3, 2014
PubMed
Summary
This summary is machine-generated.

Cell migration direction is driven by fluctuating protrusions on ratchet-like structures, not just chemical signals. This finding allows for quantitative prediction of cell movement, advancing our understanding of directed cell motility.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Directional cell migration is crucial in physiology, typically guided by chemical gradients.
  • In vitro studies reveal other cues like stiffness gradients and micropatterns influence cell movement.
  • The underlying cellular mechanisms for non-chemical gradient-guided migration remain poorly understood.

Purpose of the Study:

  • To elucidate the cellular mechanisms driving directional cell migration in response to various cues.
  • To identify key factors governing cell trajectory prediction in different microenvironmental conditions.
  • To develop a theoretical framework explaining biased cell motility.

Main Methods:

  • Utilized NIH3T3 cell migration assays with varied adhesive micropatterns.
  • Analyzed protrusion statistics and dynamics using advanced imaging techniques.
  • Employed drug treatments to modulate internal cellular protrusion activity.
  • Developed a theoretical model based on protrusion fluctuation asymmetry.

Main Results:

  • Identified fluctuating protrusions on ratchet-like structures as a key driver of directed NIH3T3 cell migration.
  • Introduced the concept of an 'efficient protrusion' and a quantifiable 'direction index'.
  • Demonstrated that protrusion statistics accurately predict cell trajectories across diverse external and internal conditions.
  • Showed that asymmetry in protrusion fluctuations is sufficient to model long-term cell motion.

Conclusions:

  • Cellular protrusions and their fluctuating dynamics are critical for directed migration, even without chemical gradients.
  • The developed theoretical model provides a quantitative framework for predicting cell migration patterns.
  • This work advances the understanding of cell motility mechanisms and stochastic processes in biology.