Characterization of potassium channel modulators with QPatch automated patch-clamp technology: system characteristics...

Area of Science:

• Biophysics
• Pharmacology
• Biotechnology

Background:

• Patch-clamp electrophysiology is crucial for studying ion channel function.
• High-throughput screening of ion channels requires robust and automated systems.
• Existing methods can be time-consuming and labor-intensive.

Purpose of the Study:

• To develop and validate a novel automated patch-clamp system (QPatch 16) for high-throughput drug screening.
• To assess the quality of recordings and success rates using planar silicon chips with etched holes.
• To evaluate the system's performance in screening human potassium channels and characterizing drug interactions.

Main Methods:

• Development of planar silicon chips with 1-2-microm etched holes for patch-clamp recordings.
• Implementation of an automated 16-channel parallel screening system (QPatch 16).
• Validation using Chinese hamster ovary (CHO) and human embryonic kidney (HEK) cells expressing hERG and KCNQ4 potassium channels.

Main Results:

• Achieved high-quality gigaseals (4.1 +/- 0.4 GOmega) and whole-cell current recordings from suspended cells.
• Demonstrated high success rates for gigaseal formation (40-95%) and stable whole-cell configurations (>20 min).
• Obtained dose-response data for known hERG channel inhibitors (verapamil, rBeKm-1) comparable to literature values.

Conclusions:

• The QPatch 16 system, utilizing novel silicon chip technology, provides a reliable platform for automated patch-clamp screening.
• The system enables high-quality recordings from suspended cells, facilitating efficient drug discovery for ion channel targets.
• Successful characterization of potassium channel inhibitors validates the system's utility in pharmacological studies.