A cell-based bar code reader for high-throughput screening of ion channel-ligand interactions.

Area of Science:

• Biophysics
• Pharmacology
• Microfluidics

Background:

• Ion channel-ligand interactions are crucial for cellular function and drug development.
• Characterizing weak-affinity interactions is challenging due to low binding signals and the need for extensive screening.
• Existing methods often lack the throughput and kinetic resolution required for comprehensive analysis.

Purpose of the Study:

• To develop and validate a microfluidics-patch clamp platform for high-throughput screening.
• To enable rapid characterization of weak-affinity ion channel-ligand interactions.
• To achieve kinetically resolved measurements and dose-response curves for a large number of ligands.

Main Methods:

• Integration of a microfluidic chip with multiple solution channels into an open volume.
• Utilizing a motorized scanning stage for rapid (millisecond-scale) cell movement across discrete solution zones.
• Performing patch clamp electrophysiology on scanned cells to measure ion channel activity.

Main Results:

• The platform allows for high-throughput screening of up to 10^3 ligand solutions per day.
• Kinetically resolved patch clamp measurements and dose-response curves can be obtained.
• The system is capable of characterizing weak-affinity ion channel-ligand interactions efficiently.

Conclusions:

• The developed microfluidics-patch clamp platform significantly enhances the efficiency of ion channel screening.
• This technology accelerates the characterization of weak-affinity interactions, aiding in drug discovery.
• The platform offers a powerful tool for rapid, high-throughput analysis of ligand-receptor dynamics.