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Related Concept Videos

Patch Clamp01:18

Patch Clamp

Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...

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One-channel Cell-attached Patch-clamp Recording
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Achieving maximal speed of solution exchange for patch clamp experiments.

Jerónimo Auzmendi1, Darío Fernández Do Porto, Carla Pallavicini

  • 1Instituto de Química Física de los Materiales Medio Ambiente y Energía, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.

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Summary

This study developed a novel solution exchange system capable of delivering ultra-short agonist pulses (26 µs). This breakthrough enables detailed investigation of rapid molecular events in ion channel activation, crucial for understanding receptors like nicotinic acetylcholine receptors.

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Optimized Transfection Strategy for Expression and Electrophysiological Recording of Recombinant Voltage-Gated Ion Channels in HEK-293T Cells
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Optimized Transfection Strategy for Expression and Electrophysiological Recording of Recombinant Voltage-Gated Ion Channels in HEK-293T Cells

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Area of Science:

  • Biophysics
  • Neuroscience
  • Molecular Biology

Background:

  • Studying rapid molecular events in ion channel gating requires precise control over agonist application and removal.
  • Existing solution exchange systems are too slow ( >100 µs pulses), limiting the study of fast-acting receptors like nicotinic acetylcholine receptors (nAChR) and AMPA receptors.

Purpose of the Study:

  • To develop and optimize a solution exchange system capable of delivering agonist pulses significantly shorter than 100 µs.
  • To enable the resolution of kinetics for agonist binding events separate from channel gating processes.

Main Methods:

  • Engineered a solution exchange system with faster flow velocity, a narrower partition, and increased interface movement velocity and bandwidth.
  • Utilized feedback control and transfer function analysis to optimize piezoelectric actuator signals, mitigating mechanical oscillations.
  • Measured system performance using patch-clamp electrophysiology.

Main Results:

  • Achieved agonist pulses as short as 26 ± 1 µs.
  • Demonstrated 93 ± 1% solution exchange efficiency in an open patch pipette tip.
  • Successfully optimized the system to overcome mechanical resonance issues.

Conclusions:

  • The developed system provides unprecedented temporal resolution for studying ligand-receptor interactions.
  • Enables detailed investigation of the molecular mechanisms occurring between agonist binding and ion channel opening.
  • Opens new avenues for studying the kinetics of fast neurotransmitter receptors.