Biomedical Microdevices

, Volume 13, Issue 1, pp 221–230

Electrochemically switchable platform for the micro-patterning and release of heterotypic cell sheets

  • Orane Guillaume-Gentil
  • Michael Gabi
  • Marcy Zenobi-Wong
  • Janos Vörös
Article

Abstract

This article describes a dynamic platform in which the biointerfacial properties of micro-patterned domains can be switched electrochemically through the spatio-temporally controlled dissolution and adsorption of polyelectrolyte coatings. Insulating SU-8 micro-patterns created on a transparent indium tin oxide electrode by photolithography allowed for the local control over the electrochemical dissolution of polyelectrolyte mono- and multilayers, with polyelectrolytes shielded from the electrochemical treatment by the underlying photoresist stencil. The platform allowed for the creation of micro-patterned cell co-cultures through the electrochemical removal of a non-fouling polyelectrolyte coating and the localized adsorption of a cell adhesive one after attachment of the first cell population. In addition, the use of weak adhesive polyelectrolyte coatings on the photoresist domains allowed for the detachment of a contiguous heterotypic cell sheet upon electrochemical trigger. Cells grown on the ITO domains peeled off upon electrochemical dissolution of the sacrificial polyelectrolyte substrate, whereas adjacent cell areas on the insulated weakly adhesive substrate easily detached through the contractile force generated by neighboring cells. This electrochemical strategy for the micro-patterning and detachment of heterotypic cell sheets combines simplicity, precision and versatility, and presents great prospects for the creation of cellular constructs which mimic the cellular complexity of native tissues.

Keywords

Indium tin oxide electrode SU-8 photoresist Micro-patterning Photolithography Cell co-cultures Heterotypic cell sheet engineering 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Orane Guillaume-Gentil
    • 1
  • Michael Gabi
    • 1
  • Marcy Zenobi-Wong
    • 1
  • Janos Vörös
    • 1
  1. 1.Laboratory of Biosensors & BioelectronicsInstitute for Biomedical Engineering, ETH ZurichZurichSwitzerland

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