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Aligned Collagen Fibers Drive Distinct Traction Force Signatures to Regulate Contact Guidance.

Gopal Niraula1, Azarnoosh Foroozandehfar1, Fred Rogers Namanda2

  • 1Department of Chemical and Biological Engineering, Iowa State University, 2114 Sweeney Hall, Ames, Iowa 50011, United States.

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Cells exert traction forces on aligned collagen fibers, crucial for understanding migration in tissues like those affected by cancer and fibrosis. This study reveals how substrate stiffness and cytoskeletal elements regulate these forces.

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Area of Science:

  • Cellular mechanics
  • Biophysics
  • Extracellular matrix dynamics

Background:

  • Cells interact with the extracellular matrix (ECM) by exerting traction forces.
  • In vivo, these forces are often applied to aligned collagen fibers, prevalent in conditions like cancer, fibrosis, and wound healing.
  • The mechanisms of force transmission on aligned collagen fibers and cytoskeletal regulation remain poorly understood.

Purpose of the Study:

  • To investigate how cells transmit traction forces on aligned collagen fibers.
  • To elucidate the role of the cytoskeleton in regulating these forces.
  • To understand how fiber network architecture influences cellular force exertion.

Main Methods:

  • Development of a novel fiber-traction force microscopy (f-TFM) technique.
  • Utilizing collagen fibers transferred to flexible substrates with fiducial markers.
  • Quantifying cellular traction stress and force kinetics in response to varying substrate properties and cytoskeletal regulators.

Main Results:

  • Substrate elastic modulus dictates steady-state traction stress but not force kinetics on aligned collagen fibers.
  • Collagen fiber networks generate higher traction stresses than adsorbed collagen, especially when randomly oriented.
  • Formins and Arp2/3 differentially modulate traction stress magnitude and kinetics in weakly guided cells, while myosin II dominates in strongly guided cells.
  • A positive correlation exists between traction force and cell directionality for modest alignment, but not for high alignment.

Conclusions:

  • Cellular traction forces on aligned collagen fibers are complex, influenced by substrate mechanics and cytoskeletal dynamics.
  • Formins, Arp2/3, and myosin II play distinct roles in force regulation depending on cell-fiber interaction strength.
  • Findings provide insights into cell migration through fibrous tissues and have implications for understanding diseases involving ECM remodeling.