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Related Experiment Video

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Capturing the Interaction Kinetics of an Ion Channel Protein with Small Molecules by the Bio-layer Interferometry Assay
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Incubation type Si-based planar ion channel biosensor.

Tsuneo Urisu1, Toshifumi Asano, Zhenlong Zhang

  • 1Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan. urisu@ims.ac.jp

Analytical and Bioanalytical Chemistry
|April 9, 2008
PubMed
Summary

Researchers developed a novel planar ion channel biosensor capable of cell culture. This device successfully detected whole-cell currents from transient receptor potential vanilloid type 1 (TRPV1) channels in HEK293 cells.

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Area of Science:

  • Biomedical Engineering
  • Biosensor Technology
  • Cellular Electrophysiology

Background:

  • Planar biosensors offer miniaturization and high-throughput potential for biological signal detection.
  • Cell culture integration on sensor chips is crucial for direct cellular analysis.
  • Transient Receptor Potential Vanilloid Type 1 (TRPV1) channels are important targets in pain and inflammation research.

Purpose of the Study:

  • To fabricate and characterize a novel planar-type ion channel biosensor integrated with cell culture capabilities.
  • To evaluate the biosensor's performance in detecting ion channel activity from cultured cells.
  • To demonstrate the utility of the biosensor for studying specific ion channels like TRPV1.

Main Methods:

  • Fabrication of a planar ion channel biosensor using a silicon-on-insulator substrate.
  • Coating the sensor chip surface with fibronectin to facilitate cell adhesion and culture.
  • Performing whole-cell patch-clamp recordings on HEK293 cells expressing TRPV1 channels on the biosensor.
  • Utilizing capsaicin as a ligand to activate TRPV1 channels and measure current responses.

Main Results:

  • Successful fabrication of a planar biosensor chip enabling cell culture.
  • Achieved whole-cell ion channel current recordings from TRPV1-expressing HEK293 cells, despite low seal resistance (approx. 7 Mohms).
  • Observed a good signal-to-noise ratio in the detected TRPV1 channel currents upon capsaicin stimulation.

Conclusions:

  • The developed planar ion channel biosensor is a viable platform for cell culture and electrophysiological studies.
  • This biosensor enables the detection of ion channel activity, specifically TRPV1 currents, with a satisfactory signal quality.
  • The technology holds promise for advancing research in ion channel function and drug screening.