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Quantitative Analysis of Cell Edge Dynamics during Cell Spreading
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Initial contact guidance during cell spreading is contractility-independent.

Adrià Sales1, Andrew W Holle, Ralf Kemkemer

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Human endothelial cells (ECs) show initial passive contact guidance on microgrooves, followed by an active phase dependent on actomyosin contractility. Cytoskeleton-actin interactions are crucial for this topographical response.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Materials Science

Background:

  • Cellular behavior is influenced by substrate topography, a phenomenon known as contact guidance.
  • The underlying molecular mechanisms of contact guidance remain largely unelucidated.
  • Human endothelial cells (ECs) are a key cell type for studying mechanotransduction and topographical responses.

Purpose of the Study:

  • To investigate the mechanisms of contact guidance in human endothelial cells (ECs) on microgrooved substrates.
  • To differentiate between passive and active phases of contact guidance.
  • To determine the role of the cytoskeleton, particularly actomyosin contractility and actin-substrate interactions, in contact guidance.

Main Methods:

  • Culturing human endothelial cells (ECs) on well-defined microgroove topographies.
  • Perturbing cytoskeletal structures using the actomyosin inhibitor blebbistatatin.
  • Culturing cells in an inverted orientation to indirectly perturb the actin cytoskeleton.
  • Analyzing cell alignment and extension dynamics (lamellipodia and filopodia).

Main Results:

  • Initial contact guidance of ECs on microgrooves was independent of actomyosin contractility (passive phase).
  • Later-stage cell alignment was dependent on actomyosin contractility, indicating an active phase involving mechanosensitive feedback.
  • Indirect perturbation of the actin cytoskeleton (inverted culture) reduced contact guidance, suggesting impaired cytoskeleton-substrate interaction.
  • Contact guidance at the microscale was primarily driven by lamellipodia, with no observed bias in filopodia extension.

Conclusions:

  • Contact guidance in ECs involves distinct passive and active phases.
  • Actomyosin contractility and proper actin cytoskeleton-substrate coupling are essential for the active phase of contact guidance.
  • Lamellipodia play a dominant role in mediating microscale contact guidance.