Development of a fluorescent ligand-binding assay using the AcroWell filter plate.

Area of Science:

• Biochemistry
• Pharmacology
• Drug Discovery

Background:

• Receptor-ligand affinity screening is crucial for drug discovery.
• Traditional radioactive ligand screening has significant limitations.
• Development of sensitive, nonradioactive alternatives is essential.

Purpose of the Study:

• To evaluate the AcroWell 96-well filter plate for nonradioactive receptor-ligand binding assays.
• To demonstrate the utility of time-resolved fluorescence for detecting lanthanide-labeled ligands.
• To assess the performance of the AcroWell system in comparison to radioisotopic techniques.

Main Methods:

• Utilized the AcroWell 96-well filter plate with a low-fluorescent-background membrane.
• Employed time-resolved fluorescence detection with lanthanide-labeled ligands (europium-labeled galanin).
• Performed saturation binding experiments and a mock screening assay.

Main Results:

• Achieved low-background fluorescence and high signal-to-noise ratios comparable to radioisotopic methods.
• Maintained the biological integrity of receptor-ligand interactions.
• Demonstrated reliable discrimination of active and inactive compounds with low well-to-well variability.

Conclusions:

• The AcroWell system provides a sensitive and reliable nonradioactive alternative for receptor-ligand screening.
• This technology supports robust drug discovery efforts by enabling accurate identification of low-affinity interactions.
• The AcroWell system is compatible with robotic platforms for high-throughput applications.