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Related Experiment Videos

Transmission electron microscopy study of the cell-sensor interface.

Günter Wrobel1, Matthias Höller, Sven Ingebrandt

  • 1Institute of Bio- and Nanosystems, Center of Nanoelectronic Systems for Information Technology, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.

Journal of the Royal Society, Interface
|July 5, 2007
PubMed
Summary
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Understanding the cell-sensor interface is key for biosensor development. This study reveals how protein coatings alter cell membrane proximity to the sensor surface, impacting signal recording.

Area of Science:

  • Biotechnology and Biomedical Engineering
  • Materials Science
  • Cell Biology

Background:

  • Micro- and nanoelectronics-based biosensors are increasingly used for non-invasive cellular activity monitoring.
  • The cell-sensor interface critically affects signal transduction in these devices.
  • Limited understanding exists regarding the nanoscopic structure of the cell-sensor interface.

Purpose of the Study:

  • To analyze the nanoscopic structure of the cell-sensor interface.
  • To investigate how different protein coatings influence the cell membrane's proximity to the sensor surface.

Main Methods:

  • Cultured HEK293 cells on protein-coated substrates.
  • Utilized transmission electron microscopy (TEM) for high-resolution imaging.
  • Employed imaging ellipsometry to complement TEM and overcome preparation limitations.

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Main Results:

  • Cell-substrate contact geometry is significantly influenced by the type of protein coating.
  • Polylysine coating resulted in an average membrane-substrate distance of 35-40 nm.
  • Fibronectin, laminin, and concanavalin-A coatings induced highly protruded cell membranes.

Conclusions:

  • Protein coating type dictates the nanoscopic interface structure between cells and sensor substrates.
  • This nanoscopic characterization is essential for interpreting biosensor recordings.
  • The presented methodology enables detailed nanoscopic analysis of cell-sensor interfaces.