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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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Chemotaxis and Direction of Cell Migration01:21

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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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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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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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Selectins01:25

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Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain,...
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Related Experiment Video

Updated: Sep 1, 2025

Author Spotlight: Understanding Disease Mechanisms Through Real-Time Analysis of T-Cell Migration
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Author Spotlight: Understanding Disease Mechanisms Through Real-Time Analysis of T-Cell Migration

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Adhesion-independent topography-based leukocyte migration.

Peter Friedl1, Konstantinos Konstantopoulos2, Erik Sahai3

  • 1Radboud University Medical Centre.

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|August 18, 2022
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Summary
This summary is machine-generated.

Cells can move without direct adhesion by coupling internal actin flows with irregular environments. This discovery reveals a new mechanism for cell migration independent of traditional adhesion receptors.

Keywords:
Actinadhesioncellsleukocyte

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biomechanical Engineering

Background:

  • Cell migration is crucial for biological processes.
  • Traditionally, cell movement relies on transmembrane receptors like integrins linking the extracellular matrix to the actin cytoskeleton.
  • However, some cells migrate independently of these receptors, a mechanism not fully understood.

Purpose of the Study:

  • To investigate the biophysical mechanisms of integrin-independent cell migration.
  • To understand the role of the cellular and environmental requirements in this migration mode.
  • To explore how cells generate mechanical force for movement without substrate adhesion.

Main Methods:

  • Development of innovative 2D and 3D engineered microdevices.
  • Experimental probing of T lymphocytes and dendritic cells under limited substrate adhesion.
  • Combined use of experimental data and theoretical modeling.

Main Results:

  • Identification of a physical principle linking retrograde actin flow and irregular extracellular confinement.
  • Demonstration that cells can generate mechanical resistance and move without receptor-mediated adhesion.
  • Establishment of mechanical interaction with irregular 3D environments as a key factor.

Conclusions:

  • Cell migration can occur independently of integrin-mediated adhesion.
  • Irregular extracellular confinement and retrograde actin flow are critical for integrin-independent cell movement.
  • This mechanism is relevant to cell migration in various tissue contexts.