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Flexible nanopillars to regulate cell adhesion and movement.

Fan-Ching Chien1, Yang-Hong Dai, Chiung Wen Kuo

  • 1Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan.

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|October 27, 2016
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Summary

Flexible polymer nanopillars guide cell behavior. Cells form focal adhesions on taller nanopillars, aligning and migrating along nanotopographical cues for controlled cell movement.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Nanotechnology

Background:

  • Cellular functions like alignment and migration are influenced by substrate topography.
  • Nanopillar substrates offer tunable physical cues for studying cell-substrate interactions.

Purpose of the Study:

  • To investigate how flexible polymer nanopillar substrates with varying heights influence cell alignment and migration.
  • To elucidate the role of focal adhesion formation in mediating cell responses to nanotopography.

Main Methods:

  • Fabrication of polymer nanopillar substrates with controlled heights (400, 800, 1200 nm) and diameters (400 nm).
  • Utilized super-resolution localization imaging and vinculin protein pair-distance analysis to study focal adhesion formation.
  • Observed Chinese hamster ovary (CHO) cell alignment and migration patterns on the fabricated substrates.

Main Results:

  • Mature focal adhesions were formed on 1200 nm high nanopillars, facilitated by nanopillar bending and linking of adhesions.
  • Nanopillar spacing confinement enhanced the directional and orthogonal formation of focal adhesions.
  • Actin filament organization aligned with focal adhesions, leading to 78% of CHO cells aligning with substrate cues.
  • Biased cell migration was observed on the 1200 nm high nanopillar substrates.

Conclusions:

  • Flexible polymer nanopillars effectively guide cell alignment and migration through controlled focal adhesion formation.
  • Nanopillar height and spacing are critical parameters for dictating cell response and organization.
  • This study demonstrates a method for engineering nanotopographical cues to control cell behavior for potential applications in tissue engineering and regenerative medicine.