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A simple perfusion system for patch-clamp studies

V S Vorobjev1, I N Sharonova, H L Haas

  • 1Brain Research Institute, Russian Academy of Medical Sciences, Moscow, Russian Federation.

Journal of Neuroscience Methods
|October 1, 1996
PubMed
Summary
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This study introduces a novel, simple perfusion system for rapid solution exchange in single capillaries, enabling quick drug application for cell and membrane patch recordings. This gravity-driven device significantly reduces solution exchange times to under 20 seconds.

Area of Science:

  • Physiology
  • Biotechnology
  • Neuroscience

Background:

  • Traditional perfusion systems often require separate capillaries for each drug, complicating rapid solution exchange.
  • Efficient and rapid application of various solutions is crucial for studying cellular responses and membrane dynamics.

Purpose of the Study:

  • To present a simplified, cost-effective system for rapid solution exchange in a single capillary during electrophysiological recordings.
  • To enable precise and swift application of multiple test solutions to isolated cells or membrane patches.

Main Methods:

  • A gravity-driven perfusion system utilizing a 100 microliter reservoir and a single capillary.
  • Integration with a recording pipette setup, featuring two capillaries with solution exchange capabilities within a bath tube.

Related Experiment Videos

  • A capstan motor mechanism for precise control of solution application and mechanical displacement.

    • Main Results:

    • Achieved sequential solution application with exchange times under 20 seconds.
    • Flow rates of approximately 3 mm/s (30 nl/s in capillaries, 600 nl/s in bath tube).
    • Adjustable mechanical displacement for concentration jumps from 0 to 0.4 mm within 2-100 ms.

    Conclusions:

    • The developed system offers a simple and efficient method for rapid solution exchange, enhancing experimental throughput.
    • This technique is valuable for electrophysiology, particularly for concentration-jump experiments on isolated cells and membrane patches.