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Quantifying Molecular-Level Cell Adhesion on Electroactive Conducting Polymers using Electrochemical-Single Cell

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Electrochemical switching of conducting polymers alters live single cell adhesion. Cell binding strengthens as polymers become reduced, enhancing surface hydrophilicity and reducing bond stiffness.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Cellular Biophysics

Background:

  • Cell-conducting polymer interactions are crucial for biomaterial applications.
  • Understanding molecular-level adhesion forces is key to designing effective interfaces.
  • Electrochemical control offers a novel method to modulate cell adhesion.

Purpose of the Study:

  • To quantify live single cell adhesion to conducting polymers under electrochemical control.
  • To investigate how electrical switching of polymer redox states affects cell-surface interactions.
  • To elucidate the molecular mechanisms underlying electrochemically modulated cell adhesion.

Main Methods:

  • Combined Single Cell Force Spectroscopy (SCFS) with Electrochemical-Atomic Force Microscopy (EC-AFM).
  • Applied voltage to switch conducting polymers between oxidized and reduced states.
  • Measured adhesion forces and bond stiffness between single cells and polymer surfaces.

Main Results:

  • Single cell adhesion significantly increased as polymers transitioned from oxidized to reduced states.
  • Stronger binding was observed with sulfonate groups compared to hydrophobic groups on reduced polymers.
  • Electrochemical reduction led to increased surface hydrophilicity and cell media uptake.
  • Electrical stimulation decreased binding force and stiffness of adhesive bonds at the molecular level.

Conclusions:

  • Electrochemical switching dynamically modulates cell adhesion at the cell-conducting polymer interface.
  • Surface properties like hydrophilicity and molecular orientation are key drivers of electrochemically controlled adhesion.
  • Findings provide insights into cell adhesion molecule interactions within electrical fields and at electrode interfaces.