Biomaterials Research (생체재료학회지)

Korean Society for Biomaterials (한국생체재료학회)
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Schwann cell durotaxis can be guided by physiologically relevant stiffness gradients

  • Evans, Elisabeth B. (Department of Molecular Pharmacology, Physiology, Brown University) ;
  • Brady, Samantha W. (Department of Molecular Pharmacology, Physiology, Brown University) ;
  • Tripathi, Anubhav (Department of Molecular Pharmacology, Physiology, Brown University) ;
  • Hoffman-Kim, Diane (Department of Molecular Pharmacology, Physiology, Brown University)
  • Received : 2018.03.05
  • Accepted : 2018.04.13
  • Published : 2018.06.01
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Abstract

Background: Successful nerve regeneration depends upon directed migration of morphologically specialized repair state Schwann cells across a nerve defect. Although several groups have studied directed migration of Schwann cells in response to chemical or topographic cues, the current understanding of how the mechanical environment influences migration remains largely understudied and incomplete. Therefore, the focus of this study was to evaluate Schwann cell migration and morphodynamics in the presence of stiffness gradients, which revealed that Schwann cells can follow extracellular gradients of increasing stiffness, in a form of directed migration termed durotaxis. Methods: Polyacrylamide substrates were fabricated to mimic the range of stiffness found in peripheral nerve tissue. We assessed Schwann cell response to substrates that were either mechanically uniform or embedded with a shallow or steep stiffness gradient, respectively corresponding to the mechanical niche present during either the fluid phase or subsequent matrix phase of the peripheral nerve regeneration process. We examined cell migration (velocity and directionality) and morphology (elongation, spread area, nuclear aspect ratio, and cell process dynamics). We also characterized the surface morphology of Schwann cells by scanning electron microscopy. Results: On laminin-coated polyacrylamide substrates embedded with either a shallow (~0.04 kPa/mm) or steep (~0.95 kPa/mm) stiffness gradient, Schwann cells displayed durotaxis, increasing both their speed and directionality along the gradient materials, fabricated with elastic moduli in the range found in peripheral nerve tissue. Uniquely and unlike cell behavior reported in other cell types, the durotactic response of Schwann cells was not dependent upon the slope of the gradient. When we examined whether durotaxis behavior was accompanied by a pro-regenerative Schwann cell phenotype, we observed altered cell morphology, including increases in spread area and the number, elongation, and branching of the cellular processes, on the steep but not the shallow gradient materials. This phenotype emerged within hours of the cells adhering to the materials and was sustained throughout the 24 hour duration of the experiment. Control experiments also showed that unlike most adherent cells, Schwann cells did not alter their morphology in response to uniform substrates of different stiffnesses. Conclusion: This study is notable in its report of durotaxis of cells in response to a stiffness gradient slope, which is greater than an order of magnitude less than reported elsewhere in the literature, suggesting Schwann cells are highly sensitive detectors of mechanical heterogeneity. Altogether, this work identifies durotaxis as a new migratory modality in Schwann cells, and further shows that the presence of a steep stiffness gradient can support a pro-regenerative cell morphology.

Keywords

Acknowledgement

Supported by : National Institutes of Health (NIH)

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