Biomedical Microdevices

, Volume 12, Issue 6, pp 977–985

High-fidelity patch-clamp recordings from neurons cultured on a polymer microchip

Authors

    • Institute for Microstructural SciencesNational Research Council of Canada
  • Christophe Py
    • Institute for Microstructural SciencesNational Research Council of Canada
  • Mike W. Denhoff
    • Institute for Microstructural SciencesNational Research Council of Canada
  • Marzia Martina
    • Institute for Biological SciencesNational Research Council of Canada
  • Robert Monette
    • Institute for Biological SciencesNational Research Council of Canada
  • Tanya Comas
    • Institute for Biological SciencesNational Research Council of Canada
  • Collin Luk
    • Hotchkiss Brain InstituteUniversity of Calgary
  • Naweed Syed
    • Hotchkiss Brain InstituteUniversity of Calgary
  • Geoff Mealing
    • Institute for Biological SciencesNational Research Council of Canada
Article

DOI: 10.1007/s10544-010-9452-z

Cite this article as:
Martinez, D., Py, C., Denhoff, M.W. et al. Biomed Microdevices (2010) 12: 977. doi:10.1007/s10544-010-9452-z

Abstract

We present a polymer microchip capable of monitoring neuronal activity with a fidelity never before obtained on a planar patch-clamp device. Cardio-respiratory neurons Left Pedal Dorsal 1 (LPeD1) from mollusc Lymnaea were cultured on the microchip’s polyimide surface for 2 to 4 hours. Cultured neurons formed high resistance seals (gigaseals) between the cell membrane and the surface surrounding apertures etched in the polyimide. Gigaseal formation was observed without applying external force, such as suction, on neurons. The formation of gigaseals, as well as the low access resistance and shunt capacitance values of the polymer microchip resulted in high-fidelity recordings. On-chip culture of neurons permitted, for the first time on a polymeric patch-clamp device, the recording of high fidelity physiological action potentials. Microfabrication of the hybrid poly(dimethylsiloxane)—polyimide (PDMS-PI) microchip is discussed, including a two-layer PDMS processing technique resulting in minimized shrinking variations.

Keywords

Planar patch-clampMicrofluidicNeuronsPoly(dimethylsiloxane)PolyimideAction potential

Abbreviations

PDMS

poly(dimethylsiloxane)

PI

polyimide

LPeD1

Left Pedal Dorsal 1

R-C

access resistance – shunt capacitance

SEM

scanning electron microscope

AFM

atomic force microscope

Copyright information

© Her Majesty the Queen in Right of Canada 2010