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Related Concept Videos

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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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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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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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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.
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Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration
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Extracellular Hydraulic Resistance Enhances Cell Migration.

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Area of Science:

  • Cell biology
  • Biophysics
  • Mechanobiology

Background:

  • Cell migration is crucial for biological processes.
  • In vivo microenvironments present physical challenges, including varying fluid viscosity.
  • Increased viscosity is typically expected to impede cell movement.

Purpose of the Study:

  • To investigate the effect of high viscosity on cell migration speed and underlying mechanisms.
  • To explore the roles of actin dynamics and water transport in cell movement within viscous media.

Main Methods:

  • Utilized 2D substrates with varying media viscosity.
  • Examined actin dynamics and water dynamics via ion channel activity.
  • Manipulated ion channel flux, actin-dependent trafficking, and intracellular calcium levels.
  • Employed physical modeling to interpret experimental findings.

Main Results:

  • Cells exhibited increased migration speed in high viscosity media, contrary to predictions.
  • Cell area increased, while actomyosin dynamics remained largely unchanged.
  • Inhibition of ion channel flux significantly reduced cell speed in high viscosity.
  • Altered ion channel positioning and calcium activity were observed in high viscosity.

Conclusions:

  • Cytoplasmic actin and water phases are coupled to drive cell migration in high viscosity.
  • Ion channel activity and associated water flux are critical for enhanced cell speed in viscous environments.
  • Findings align with physical models predicting cell speedup in high viscosity.