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A loudspeaker-driven system for rapid and multiple solution exchanges in patch-clamp experiments.
P F Méry1, P Lechêne, R Fischmeister
1Laboratoire de Physiologie Cellulaire Cardiaque, INSERM U-241, Université de Paris-Sud, Orsay, France.
Pflugers Archiv : European Journal of Physiology
|April 1, 1992
Summary
This study introduces an affordable system for rapid, synchronized solution changes around cells during voltage-clamp experiments. The new method enables precise control over drug application, aiding ion channel research.
Area of Science:
- Physiology
- Biophysics
- Neuroscience
Background:
- Accurate and rapid solution exchange is critical for studying dynamic cellular processes, particularly ion channel function.
- Existing methods for solution exchange under voltage-clamp conditions can be slow or lack synchronization capabilities.
Purpose of the Study:
- To develop and validate a novel, inexpensive system for rapid and synchronized solution changes around membrane patches or cells.
- To enable precise temporal control over the application of external solutions for electrophysiological studies.
Main Methods:
- A system utilizing four capillary tubings attached to a loudspeaker coil for servo-controlled positioning.
- High-speed solution flow (up to 5 cm/s) achieved through capillary design and servo-control.
- Synchronization of solution changes with voltage-clamp depolarizations.
Main Results:
- Complete external solution exchange around a frog ventricular cell achieved within 20-30 ms at 5 cm/s flow speed.
- Solution exchange at the tip of an open patch pipette was 3-5 times faster.
- Established optimal conditions and identified contamination avoidance strategies by determining 3D contamination profiles.
Conclusions:
- The developed system offers a cost-effective and efficient solution for rapid, synchronized solution exchange in electrophysiology.
- This technology facilitates the study of time-dependent drug effects on voltage-operated ion channels.