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Soft topographical patterns trigger a stiffness-dependent cellular response to contact guidance.

Jordi Comelles1,2, Vanesa Fernández-Majada1,3, Verónica Acevedo1

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Substrate stiffness influences how cells respond to topographical cues for directed migration. Microtubules in fibroblasts and overall migration in carcinoma cells show stiffness-dependent responses to groove-guided movement.

Keywords:
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Area of Science:

  • Cell Biology
  • Biophysics
  • Materials Science

Background:

  • Topographical patterns on substrates mimic extracellular matrix fibers, guiding cell behavior via contact guidance.
  • Contact guidance involves cell elongation, alignment, and migration along groove direction.
  • Previous studies focused on non-physiological stiffness, leaving the role of physiological stiffness unexplored.

Purpose of the Study:

  • To investigate how substrate stiffness modulates cellular responses to topographical contact guidance.
  • To determine the differential effects of stiffness on cell migration in fibroblasts and breast carcinoma cells.

Main Methods:

  • Utilized grooved substrates with varying stiffness within the physiological range.
  • Analyzed cell responses including focal adhesions, F-actin, and microtubule cytoskeleton organization.
  • Quantified cell migration directionality and efficiency.

Main Results:

  • Fibroblast focal adhesions and actin responded to topography irrespective of stiffness; microtubules showed stiffness-dependent regulation of contact guidance.
  • Breast carcinoma cells (both single and clustered) exhibited stiffness-dependent contact guidance.
  • Increased substrate stiffness led to more directional and efficient migration in carcinoma cells.

Conclusions:

  • Substrate stiffness is a critical factor modulating topographical contact guidance.
  • Cellular cytoskeletal organization dictates the differential response to stiffness and topography.
  • Matrix stiffening and topographical alignment may cooperate in directional cell migration, with cell-type-specific outcomes.