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Related Experiment Video

Updated: Mar 21, 2026

Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell
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Development of a quantitative fluorescence-based ligand-binding assay.

Conor J Breen1,2, Mathilde Raverdeau2, H Paul Voorheis2

  • 1Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland.

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|May 11, 2016
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Summary

This study introduces a novel fluorescence-based method to quantify cellular receptors without radioactivity. By proteolyzing FITC-labeled proteins, it overcomes fluorescence quenching, enabling accurate receptor measurement.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Analytical Chemistry

Background:

  • Quantitative ligand-binding assays are crucial in biology.
  • Radioactive assays are common but pose safety and disposal concerns.
  • Existing fluorescence assays suffer from signal quenching upon ligand-receptor binding, limiting accuracy.

Purpose of the Study:

  • To develop a non-radioactive, quantitative ligand-binding assay.
  • To overcome the limitation of fluorescence quenching in existing assays.
  • To enable accurate measurement of cellular receptors.

Main Methods:

  • Utilized fluorescein isothiocyanate (FITC)-labeled proteins for binding studies.
  • Developed a proteolysis step to extensively degrade cell surface-bound proteins.
  • Quantified cellular receptors by comparing sample fluorescence to a known concentration of proteolyzed FITC-protein.

Main Results:

  • Successfully eliminated fluorescence quenching through proteolysis.
  • Enabled quantitative measurement of cellular receptors.
  • Demonstrated a viable alternative to radioactive ligand-binding assays.

Conclusions:

  • The developed method provides accurate quantification of cellular receptors.
  • This technique offers a safe and effective alternative to radioactivity in ligand-binding assays.
  • Facilitates research in cell biology and drug discovery by enabling precise receptor analysis.