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Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors

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Optical biosensors for cell adhesion.

Jeremy J Ramsden¹, Robert Horvath

¹Cranfield University, Bedfordshire, UK. j.ramsden@cranfield.ac.uk

Journal of Receptor and Signal Transduction Research

|July 29, 2009

Summary

This summary is machine-generated.

Planar optical waveguides enable label-free cell analysis by detecting evanescent field perturbations. This method determines cell properties like size, density, and secretions without altering their environment.

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Area of Science:

Biophotonics
Cell Biology
Materials Science

Background:

Planar optical waveguides provide a suitable surface for cell culture.
Waveguide materials, such as dielectric oxides and polymers, are biocompatible and can be modified.
Evanescent optical fields at the waveguide-liquid interface are sensitive to cellular presence.

Purpose of the Study:

To develop a label-free method for analyzing living cells using optical waveguides.
To determine various cellular parameters through evanescent field perturbation analysis.
To explore the potential for real-time monitoring of cellular behavior and secretions.

Main Methods:

Utilizing planar optical waveguides with high refractive index transparent dielectric materials.
Generating and analyzing the evanescent optical field at the cell-waveguide interface.
Measuring perturbations in the evanescent field caused by cellular presence and secretions.
Employing grating couplers to analyze waveguide lightmode propagation constants for effect separation.

Main Results:

Accurate determination of cell size, number density, and shape.
Measurement of cell refractive index, indicative of their constitution.
Quantification of secreted cellular material (microexudate) over time.
Successful separation of simultaneous effects contributing to field perturbation.

Conclusions:

Planar optical waveguides offer a versatile platform for label-free, non-invasive cell analysis.
The evanescent field perturbation method provides rich information about cell characteristics and behavior.
This technique is compatible with standard cell culture conditions and offers potential for advanced biological studies.